This work was supported by Fundaci&#243; Universitat-Empresa de les Illes Balears (Proof of concept call 2020), by the Instituto de Salud Carlos III, Ministerio de Econom&#237;a y Competividad, co-funded by the ESF European Social Fund and the ERDF European Regional Development Fund (contract to M.M.B; FI18/00104) and by the Direcci&#243; General d&#39;Investigaci&#243;, Conselleria d&#39;Investigaci&#243;, Govern Balear (contract to M.M.F.C; FPI/040/2020). The authors thank Dr. Anna Tom&#225;s and Maria Tortosa for their help at the experimental surgery and platform of IdISBa. Finally, thanks to ADEMA School of Dentistry for the access to the CBCT scanner.

NOTE: The experimental protocol of the study was approved by the Ethical Committee of Animal Experimentation of the Balearic Islands Health Research Institute (CEEA-UIB; reference number 163/03/21).
1. Animal anesthesia and procedure preparation
<ol>
	<li>Sterilize all surgical instruments (aluminium mouth gags, dental explorer, diamond lance, surgical scissors, microsurgical pliers, a micro needle holder, a hollenback carver, a periosteal microsurgical elevator, and microsurgical scissors) (5 min at 135 &#176;C) before surgery.</li>
	<li>Prepare all the solutions needed for the procedure in sterile conditions, as described:
	<ol>
		<li>Prepare a mix of Ketamine (60 mg/mL) and Xylazine (8 mg/mL) by mixing 1.6 mL of Ketamine with 1 mL of Xylazine diluted in Phosphate Buffer Solution (PBS)/saline. Store the stock at 4 &#176;C.</li>
		<li>Dilute Atipamezole to a final concentration of 0.25 mg/mL in PBS/saline. Store the stock at 4 &#176;C.</li>
		<li>Dilute Buprenorphine to a final concentration of 0.03 mg/mL in PBS/saline. Store the stock at 4 &#176;C.</li>
		<li>Prepare 1 mL of Pg-LPS (1 mg/mL) in sterile saline. Store the stock at -20 &#176;C.</li>
	</ol>
	</li>
	<li>For the experiment, use female and male Wistar rats, aged 12 weeks and weighing 210-350 g at the time of surgery. Keep the animals housed in groups under the appropriate environment and constant conditions (20-24 &#176;C, 12 h per day light-dark cycles), with food and standard water, offered ad libitum.</li>
	<li>To induce anesthesia, weigh the rat and administer the mix of Ketamine/Xylazine at a concentration of 80/10 mg/kg intraperitoneally (IP), by using a 25 G sterile hypodermic needle and 1 mL syringe.</li>
	<li>After the rat is anesthetized, place the animal on its back on a heated surgical platform; during the procedure, cover the animal&#39;s body to prevent heat loss. 
	NOTE: Anesthesia depth is assessed by the loss of pedal reflex during the procedure and by monitoring vital signs. If needed, use a small nose cone to maintain anesthesia with 2% Isoflurane in 100% oxygen. Apply sterile ophthalmic ointment to both eyes after anesthesia induction to protect the corneas and prevent drying.&#160;</li>
	<li>During the procedures, administer 100% oxygen using a small nose cone, and monitor the pulse rate and oxygen saturation by pulse oximetry. 
	NOTE: If the oxygen saturation and pulse rate fall below 95% and 190 bpm, respectively, stop the procedure and place the animal in the lateral decubitus position until reaching normal values.</li>
	<li>Open the rat mouth using an aluminum mouth gag around the incisors (upper and lower), retracting the tongue with it and stabilizing the maxilla and mandible in an open, comfortable working position, enabling access to mandibular molars. 
	NOTE: If the animal needs to be placed in lateral decubitus, remove the mouth gag before changing its position to favor recovery. Once the animal is anesthetized, collect gingival crevicular fluid (GCF) before surgery (sample in basal conditions) (day 0).</li>
	<li>Collect GCF as described by the following steps:
	<ol>
		<li>Place the animal on its back on a surgical platform and stabilize the maxilla and mandible in an open position with aluminum mouth gags.</li>
		<li>Collect GCF using a total of four (two for each M1) absorbent paper point n&#186; 30 (0.03 cm diameter x 3 cm length), by inserting it into the gingival crevice (space between gingival epithelium and adjacent enamel) around the mesio-palatal of the M1 until slight resistance. Retain the paper point in the same position for a total of 30 s before immediate removal.</li>
		<li>After collection, transfer the paper point immediately into a plastic vial, and store at -80 &#176;C until assay performance.</li>
	</ol>
	</li>
</ol>
2. Retentive ligature technique and intragingival Pg -LPS injection
NOTE: The ligature model was created (day 0) by placing a sterile braided silk ligature (5/0) around the M1 bilaterally within the gingival sulcus using microsurgical instruments and securing it with the surgeon&#39;s knots on the palatal surface. The microsurgical instruments used were microsurgical pliers, a micro needle holder, a hollenback carver, a periosteal microsurgical elevator, and microsurgical scissors. Surgical loupes with an LED light source were also used (3.6x magnification).
<ol>
	<li>Position the distal tail of the suture on the palatal side of the dentition and insert the proximal segment between the contact of M1 and second maxillary molars (M2).</li>
	<li>Use the periosteal microsurgical elevator to insert the suture within the sulcus. Wrap the ligature around the buccal surface of the M1 very carefully, as the tissues at this level present a narrow zone of attached gingiva. On the palatal aspect, make sure the suture is tightened on both ends to ensure it is driven into the gingival sulcus. 
	NOTE: If resistance is observed when inserting the suture between the M1 and the M2, the contact may be opened slightly using a dental explorer and diamond lance-shaped bur.</li>
	<li>Tie the ends of the suture with a surgeon&#39;s knot and trim the tails as short as possible. Insert the knot in the sulcus. 
	NOTE: Tips of surgical instruments can cause oral trauma and bleeding. Prepare small segments of gauze or a cotton swab to remove blood from the oral cavity and apply pressure to stop any hemorrhage. Careful soft tissue management with a microsurgical approach minimizes surgical complications and leads to less tissue trauma.</li>
	<li>After ligature positioning, inject 40 &#181;L of Pg-LPS in sterile saline with a 25 G sterile hypodermic needle and a 1 mL syringe to the subgingival tissue (between the root or neck of a tooth and the gum margin) at the mesio-palatal side of the M1 bilaterally (day 0).</li>
</ol>
3. End of the procedure
<ol>
	<li>After ligation positioning and Pg-LPS application, release the rat from the surgical state and place it in a clean individual cage under a heat lamp.</li>
	<li>Inject the antagonist Atipamezole&#160;(0.5 mg/kg subcutaneously (SC))&#160;with a 25 G sterile hypodermic needle and a 1 mL syringe.</li>
	<li>For pain relief, inject 0.03 mg/kg Buprenorphine, SC.</li>
	<li>Monitor the animal&#39;s recovery until the effects of the operation are completely reversed. Individually house each rat in the appropriate environment under constant conditions (20-24 &#176;C, 12 h per day light-dark cycles). Offer food and deionized water ad libitum.</li>
	<li>During the first 2 days after the procedure, weigh the animals and inject Buprenorphine SC twice daily&#160;for pain relief. 
	NOTE: Buprenorphine can be administered before beginning the procedure to eliminate the windup effect.</li>
	<li>During the time of the experiment, monitor the animals by weight and general behavior assessment one or two times a week.</li>
</ol>
4. Post-procedure follow-up
NOTE: The induction of PD was maintained for 14 days to promote the accumulation of bacteria biofilm and consequent inflammation. The ligatures have to be examined and adjusted, and Pg-LPS is injected three times per week (day 2, day 4, day 6, day 8, day 10, and day 12).
<ol>
	<li>Examine and adjust the ligature (day 2, day 4, day 6, day 8, day 10, and day 12) as follows:
	<ol>
		<li>Anesthetize with 2% isoflurane in 100% oxygen using an anesthesia induction chamber.</li>
		<li>After the rat is anesthetized, place the animal on its back and use a small nose cone during the procedure with 1% isoflurane in 100% oxygen for maintenance of the animal anesthesia.</li>
		<li>Open the rat mouth using the aluminum mouth gag around the incisors (upper and lower), retracting the tongue with it and stabilizing the maxilla and mandible in an open, comfortable working position, enabling access to ligatures.</li>
		<li>Tighten the ligatures against the gingiva with the help of a periosteal microsurgical elevator, and make sure the suture of the ligatures is inserted, creating inflammation around the gingiva. 
		NOTE: It is possible that 7-10 days after surgery, ligatures are lost. If this happens, follow the protocol as explained for the injection of Pg-LPS (step 2.4).</li>
	</ol>
	</li>
	<li>After the ligature adjustment, bilaterally inject 40 &#181;L of Pg-LPS with a 25 G sterile hypodermic needle and a 1 mL syringe to the subgingival tissue at the mesio-palatal side of the M1 (day 2, day 4, day 6, day 8, day 10, and day 12).</li>
	<li>Remove the nose cone for anesthesia and place the rat in its cage. Monitor the animal&#39;s recovery until the effects of the anesthesia are completely reversed.</li>
</ol>
5. Animal sacrifice and analysis
NOTE: There are different options for evaluating the progression of PD. Here, the analysis described consists of an evaluation of pro-inflammatory cytokines at the gingival crevicular fluid (GCF), and an evaluation of the loss of alveolar bone.
<ol>
	<li>On day 14 of the study (day 14), sacrifice the animals with CO2&#160;in a carbon dioxide chamber. A&#160;displacement rate of 30% to 70% of the chamber volume/min is recommended for rodents. 
	NOTE: Lack of animal response to pedal reflex and absence of vital signs must be verified to confirm&#160;euthanasia.&#160;</li>
	<li>Collect GCF as described by the following steps: 
	NOTE: GCF is collected before PD induction (before surgery) (day 0) and after PD induction (after sacrifice) (day 14).
	<ol>
		<li>Place the animal on its back on a surgical platform, and stabilize the maxilla and mandible in an open position with aluminum mouth gags.</li>
		<li>Collect the GCF using adsorbent paper point n&#186; 30 (0.03 cm diameter x 3 cm length) by inserting it into the gingival crevice around the mesio-palatal of the M1 until slight resistance. Retain the paper point in the same position for a total of 30 s before immediate removal.</li>
		<li>After collection, transfer the paper point immediately into a plastic vial and store at -80 &#176;C until assay performance.</li>
	</ol>
	</li>
	<li>To evaluate proteins within the GCF, prepare the following solutions and follow the steps of the elution method as described: 
	NOTE: IL-1&#946; is evaluated on the GCF (day 14) using an immunoassay, according to the manufacturer&#39;s protocol.
	<ol>
		<li>Prepare the elution buffer fresh and keep it on ice throughout the entire extraction process to inhibit protease activity.</li>
		<li>Prepare all solutions needed for the elution buffer as described:
		<ol>
			<li>Prepare 1 mL of Aprotinin (1 mg/mL) in ultrapure water.</li>
			<li>Prepare 10 mL of phenylmethylsulfonylfluoride (PMSF) (200 mM) in methanol.</li>
			<li>Add 125 &#181;L of PMSF and 250 &#181;L of Aprotinin to 24.5 mL of PBS solution (pH = 7.4) to prepare the elution buffer.</li>
		</ol>
		</li>
		<li>Dissolve one commercial phosphatase inhibitor tablet with 10 mL of freshly prepared elution buffer for 10 min under agitation at 4 &#176;C. 
		NOTE: The duration of GCF elution is limited; use immediately for centrifugations after the addition of phosphatase inhibitor tablet within the first 30 min.</li>
		<li>After adding the phosphatase inhibitor, add 11 &#181;L of complete elution buffer directly onto the tube with the paper points.</li>
		<li>Centrifuge the tube at 452 x g for 5 min at 4 &#176;C.</li>
		<li>Transfer the eluted content to a new plastic vial. Repeat this process four additional times to yield a 50 &#181;L total volume.</li>
		<li>After the last centrifugation, add a total volume of 60 &#181;L directly onto the paper point, and centrifuge one last time at 452 x g for 5 min at 4 &#176;C.</li>
		<li>Use the required volume eluted for protein evaluation.</li>
	</ol>
	</li>
	<li>After euthanasia and GCF collection, with the help of surgical scissors, cut out the superior jaw of the rats. Try to peel off the mask of the rat and leave as little soft tissue as possible.</li>
	<li>Position the jaw in the microscope stage for visualization and take a picture at the desired magnification.</li>
	<li>Place the jaw directly in 4% paraformaldehyde (PFA) diluted in PBS. Refresh twice a week with new PFA for 12 days for a complete fixation. 
	CAUTION: Steps involving PFA should be performed in a fume hood following the Safety Data Sheet recommendations.</li>
	<li>After complete jaw fixation, evaluate bone loss using a cone-beam computed tomography (CBCT) scanner, as follows:
	<ol>
		<li>Open the PC.</li>
		<li>Open the CBCT analysis program.</li>
		<li>Select Scan Protocol &#62; Denture Scan Mode.</li>
		<li>Select Field of View (FOV) &#62; (11x8) HIRes (90 kV of voltage and 3 mA of current).</li>
		<li>Place the fixed upper maxilla of the rats in the gantry.</li>
		<li>Click Next.</li>
		<li>Click the X-ray firing button (press the X-ray remote control to make the emission and keep it pressed for the entire duration of the scan).</li>
		<li>If necessary, relocate the upper maxilla in the center of the frontal plane by pressing the control button, then click the X-ray firing button (press the X-ray remote control to make the emission and keep it pressed for the entire duration of the scan).</li>
		<li>Click Next.</li>
		<li>Click the X-ray firing button (press the X-ray remote control to make the emission and keep it pressed for the entire duration of the scan).</li>
		<li>If necessary, relocate the denture in the center of the sagittal plane by pressing the control button, then click the X-ray firing button (press the X-ray remote control to make the emission and keep it pressed for the entire duration of the scan).</li>
		<li>Click Next.</li>
		<li>Click the Start button (press the X-ray remote control to make the emission and keep it pressed for the entire duration of the exam). Wait until receiving a processing message, and then follow the instructions shown.</li>
		<li>A window view appears. Regulate the gray at 65% and click Apply.</li>
		<li>For saving the scan, click on File and save it in DICOM format. Then, click All Images and at the DICOM export selection window, select all the parameters shown (initial image, original axial, reformatted axial, multiplanar) and select predefined type.</li>
	</ol>
	</li>
	<li>Process the maxillary molars&#39; two-dimensional and sagittal representative images using an analysis program, as follows:
	<ol>
		<li>Open the software.</li>
		<li>Click File and Open, and then select the folder with images in DICOM format and click Open.</li>
		<li>Wait until the window &#34;Convert to 8 bit&#34; appears, select the range from 0 to 6,000, and click OK.</li>
		<li>Click Raw images.</li>
		<li>Define the top and bottom of the selection to limit the region of interest. Search for the first and last images where alveolar bone appears and select it with the top of selection and bottom of selection commands. 
		NOTE: Representative two-dimensional images of the alveolar bone of the molars could be exported, as in Figure 3A,B.</li>
		<li>For sagittal representative images, click on Toggle profile bar.</li>
		<li>Draw a sagittal line in the middle of the palate and click Reslice model. Determine parameters for delimiting the region of interest (slice spacing: 1; number of slices: 100) and click OK. Wait until the reslicing model ends. Finally, click save Resliced images. 
		NOTE: Representative sagittal imagines of the alveolar bone of the molars could be exported, as in Figure 3C,D.</li>
	</ol>
	</li>
</ol>

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The authors declare no conflict of interest.

This method describes the induction of PD in rats following a combined technique of Pg-LPS injections and ligature placement around the M1, revealing that significant changes in the periodontal tissues and alveolar bone could be induced in 14 days following this method.
During this procedure, attention to different critical steps must be provided. During animal anesthesia and procedure preparation, assessing the proper anesthesia during the surgical process is critical for its success...

Periodontitis (PD) is the sixth most prevalent public health condition worldwide, affecting approximately 11% of the total population, being an advanced, irreversible, and destructive form of periodontal disease1,2. PD is an inflammatory process that affects the gingival and periodontal tissues, which results in gingiva recession, apical migration of the junctional epithelium with pocket development, and the loss of alveolar bone3. Furthermore, PD is associated with several systemic diseases, including cardiovascular disease, obesity, diabetes, and rheumatoid arthritis, for which environmental and host-specific factors play a significant role4,5.
Hence, PD is a multifactorial disease primarily initiated by the accumulation of microbial plaque - resulting from dysbiosis of microbial communities - and by an exaggerated host immune response to periodontal pathogens, which leads to the breakdown of periodontal tissue4,6. Among several periodontal bacteria, the gram-negative anaerobic bacterium Porphyromonas gingivalis is one of the key pathogens in PD4. P. gingivalis contains a complex lipopolysaccharide (LPS) in its walls, a molecule known to induce polymorphonuclear leukocyte infiltration and vascular dilatation in inflamed periodontal tissues7. This results in the production of inflammatory mediators, such as interleukin 1 (IL-1), IL-6, and IL-8, tumor necrosis factor (TNF), or prostaglandins, with a subsequent osteoclast activation and bone resorption, leading to tissue destruction and ultimate tooth loss3.
Among the different advantages of animal models include the capacity to mimic cellular complexities as in humans, or to be more accurate than in vitro studies, which are carried out on plastic surfaces with limited cell types8. For modeling PD experimentally in vivo, different animal species have been used, like non-human primates, dogs, pigs, ferrets, rabbits, mice, and rats9. However, rats are the most extensively studied animal model for the pathogenesis of PD because they are inexpensive and easy to handle10. Their dental gingival tissue has similar structural features to human gingival tissue, with a shallow gingival sulcus and junctional epithelium attached to the tooth surface. Furthermore, as in humans, the junctional epithelium facilitates the passage of bacterial, foreign materials, and exudates from inflammatory cells 9.
One of the most reported experimental models of PD induction in rats is the placement of ligatures around the teeth, which is technically challenging but reliable10. The ligature placement facilitates dental plaque and bacterial accumulation, generating a dysbiosis in the gingival sulci, that causes periodontal tissue inflammation and destruction11. Loss of periodontal attachment and resorption of alveolar bone could occur in 7 days in this rat model8.
Another animal model for PD consists of the injection of LPS into the gingival tissue. As a result, osteoclastogenesis and bone loss are stimulated. The histopathological features of this model are similar to human-established PD, characterized by higher levels of proinflammatory cytokines, collagen degradation, and alveolar bone resorption6,8.
Thus, the aim of this study was to describe a simple rat model of experimental PD based on the techniques of P. gingivalis-LPS (Pg-LPS) injections, combined with ligature placement around the first maxillary molars (M1). This is a model with similar characteristics to those observed in human PD disease, which could be used in the study of disease progression mechanisms and future possible treatments.

<table><tbody><tr><td>Adsorbent paper point n&amp;ordm;30&amp;nbsp;</td><td>Proclinc</td><td>8187</td><td></td></tr><tr><td>Aprotinin</td><td>Sigma-Aldrich</td><td>A1153</td><td></td></tr><tr><td>Atipamezole</td><td>Dechra</td><td>573751.5</td><td>Revanzol 5 mg/mL</td></tr><tr><td>Braided silk ligature (5/0)&amp;nbsp;</td><td>Laboratorio Arago Sl</td><td>613112</td><td></td></tr><tr><td>Buprenorphine&amp;nbsp;</td><td>Richter pharma</td><td>578816.6</td><td>Bupaq 0.3 mg/mL</td></tr><tr><td>Cone-beam computed tomography (CBCT) Scanner&amp;nbsp;</td><td>MyRay</td><td>hyperion X9</td><td>Model Hyperion X9</td></tr><tr><td>CTAn software</td><td>SkyScan</td><td></td><td>Version 1.13.4.0</td></tr><tr><td>Dental explorer&amp;nbsp;</td><td>Proclinc</td><td>99743</td><td></td></tr><tr><td>Diamond lance-shaped bur&amp;nbsp;</td><td>Dentaltix</td><td>IT21517</td><td></td></tr><tr><td>Food maintenance diet</td><td>Sodispain research</td><td>ROD14&amp;nbsp;</td><td></td></tr><tr><td>Heated surgical platform</td><td>PetSavers</td><td></td><td></td></tr><tr><td>Hollenback carver</td><td>Hu-FRIEDY&amp;nbsp;</td><td>HF45234</td><td></td></tr><tr><td>Hypodermic needle&amp;nbsp;&amp;nbsp;</td><td>BD&amp;nbsp;</td><td>300600</td><td>25G X 5/8&amp;rdquo; - 0,5 X 16 MM</td></tr><tr><td>Isoflurane&amp;nbsp;</td><td>Karizoo</td><td></td><td>Isoflutek 1000mg/g</td></tr><tr><td>Ketamine&amp;nbsp;&amp;nbsp;</td><td>Dechra</td><td>581140.6</td><td>Anesketin 100 mg/mL</td></tr><tr><td>Lipopolysaccharide&amp;nbsp; derived from P.Gingivalis&amp;nbsp;</td><td>InvivoGen</td><td>TLRL-PGLPS</td><td></td></tr><tr><td>Methanol</td><td>Fisher Scientific</td><td>M/4000/PB08</td><td></td></tr><tr><td>Micro needle holter</td><td>Fehling Surgical Instruments</td><td>KOT-6</td><td></td></tr><tr><td>Microsurgical pliers</td><td>KLS Martin</td><td>12-384-06-07</td><td></td></tr><tr><td>microsurgical scissors&amp;nbsp;</td><td>S&amp;amp;T microsurgical instruments</td><td>SDC-15 RV</td><td></td></tr><tr><td>Monitor iMEC 8 Vet</td><td>Mindray&amp;nbsp;</td><td></td><td></td></tr><tr><td>Multiplex bead immunoassay</td><td>Procartaplex, Thermo fisher Scientific</td><td>PPX-05</td><td></td></tr><tr><td>Paraformaldehyde (PFA)&amp;nbsp;</td><td>Sigma-Aldrich</td><td>8187151000</td><td></td></tr><tr><td>Periosteal microsurgical elevator&amp;nbsp;</td><td>Dentaltix</td><td>CU19112468</td><td></td></tr><tr><td>Phenylmethylsulfonylfluoride (PMSF)&amp;nbsp;</td><td>Roche</td><td>10837091001</td><td></td></tr><tr><td>Phosphate Buffer Solution (PBS)</td><td>Capricorn Scientific</td><td>PBS-1A</td><td></td></tr><tr><td>PhosSTOP&amp;nbsp;</td><td>Roche</td><td>4906845001</td><td>Commercial phosphatase inhibitor tablet&amp;nbsp;</td></tr><tr><td>Plastic vial</td><td>SPL Lifesciencies</td><td>60015</td><td>1.5mL</td></tr><tr><td>Saline</td><td>Cinfa</td><td>204024.3</td><td></td></tr><tr><td>Stereo Microscope&amp;nbsp;</td><td>Zeiss</td><td></td><td>Model SteREO Discovery.V12</td></tr><tr><td>Surgical loupes led light</td><td>Zeiss</td><td></td><td></td></tr><tr><td>Surgical scissors&amp;nbsp;</td><td>Zepf Surgical</td><td>08-1701-17</td><td></td></tr><tr><td>Syringe&amp;nbsp;</td><td>BD plastipak</td><td>303172</td><td>1mL</td></tr><tr><td>Veterinary dental micromotor</td><td>Eickemeyer</td><td>174028</td><td></td></tr><tr><td>Xylazine</td><td>Calier</td><td>20102-003</td><td>Xilagesic 20 mg/mL</td></tr></tbody></table>

induction of periodontitis via a combination of ligature and lipopolysaccharide injection in a rat model

Periodontitis (PD) is a highly prevalent, chronic immune-inflammatory disease of the periodontium, that results in a loss of gingival soft tissue, periodontal ligament, cementum, and alveolar bone. In this study, a simple method of PD induction in rats is described. We provide detailed instructions for placement of the ligature model around the first maxillary molars (M1) and a combination of injections of lipopolysaccharide (LPS), derived from Porphyromonas gingivalis at the mesio-palatal side of the M1. The induction of periodontitis was maintained for 14 days, promoting the accumulation of bacteria biofilm and inflammation. To validate the animal model, IL-1&#946;, a key inflammatory mediator, was determined by an immunoassay in the gingival crevicular fluid (GCF), and alveolar bone loss was calculated using cone beam computed tomography (CBCT). This technique was effective in promoting gingiva recession, alveolar bone loss, and an increase in IL-1&#946; levels in the GCF at the end of the experimental procedure after 14 days. This method was effective in inducing PD, thus being able to be used in studies on disease progression mechanisms and future possible treatments.

A timeline of the experimental steps is presented in Figure 1. Figure 2A shows an image of the mandibula after surgical intervention, with ligature placement around the sulcus of the M1 at time 0 of the experiment. Figure 2B shows how, after 14 days of the procedure, the ligature around the M1 enters the gingival sulcus, causing inflammation of the gingiva and infiltrating accumulation.
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Induction of Periodontitis via a Combination of Ligature and Lipopolysaccharide Injection in a Rat Model

In this study, a rat model of induction of periodontitis is presented via a combination of retentive ligature and repetitive injections of lipopolysaccharide derived from Porphyromonas gingivalis, over 14 days around the first maxillary molars. The ligation and LPS injection techniques were effective in inducing peridontitis, resulting in alveolar bone loss and inflammation.

Induction of Periodontitis via a Combination of Ligature and Lipopolysaccharide Injection in a Rat Model

Periodontitis (PD) is a highly prevalent, chronic immune-inflammatory disease of the periodontium, that results in a loss of gingival soft tissue, ...

induction-periodontitis-via-combination-ligature-lipopolysaccharide

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Immunology and Infection

3.6K Views.  University of the Balearic Islands (UIB). In this study, a rat model of induction of periodontitis is presented via a combination of retentive ligature and repetitive injections of lipopolysaccharide derived from Porphyromonas gingivalis, over 14 days around the first maxillary molars. The ligation and LPS injection techniques were effective in inducing peridontitis, resulting in alveolar bone loss and inflammation. 

Video: Induction of Periodontitis via a Combination of Ligature and Lipopolysaccharide Injection in a Rat Model

Preparation of Mouse Pituitary Immunogen for the Induction of Experimental Autoimmune Hypophysitis

Autoimmune hypophysitis is a chronic inflammation of the pituitary gland caused or accompanied by autoimmunity1. It has traditionally been considered a rare disease but reporting has increased markedly in recent years. Hypophysitis, in fact, develops not uncommonly as a "side effect" in cancer patients treated with antibodies that block inhibitory receptors expressed on T lymphocytes, such as CTLA-42 and PD-1 receptors. Autoimmune hypophysitis can be induced experimentally by injecting mice with pituitary proteins mixed with an adjuvant3. In this video article we demonstrate how to extract proteins from mouse pituitary glands and how to prepare them in a form suitable for inducing autoimmune hypophysitis in SJL mice.

Autoimmune hypophysitis can be reproduced in mice by injecting an extract of mouse pituitary proteins.

Autoimmune hypophysitis is a chronic inflammation of the pituitary gland caused or accompanied by autoimmunity1.  It has traditionally been considered a ...

Induction of Experimental Autoimmune Hypophysitis in SJL Mice

Autoimmune hypophysitis can be reproduced experimentally by the injection of pituitary proteins mixed with an adjuvant into susceptible mice1. Mouse models allow us to study how diseases unfold, often providing a good replica of the same processes occurring in humans. For some autoimmune diseases, like type 1A diabetes, there are models (the NOD mouse) that spontaneously develop a disease similar to the human counterpart. For many other autoimmune diseases, however, the model needs to be induced experimentally. A common approach in this regard is to inject the mouse with a dominant antigen derived from the organ being studied. For example, investigators interested in autoimmune thyroiditis inject mice with thyroglobulin2, and those interested in myasthenia gravis inject them with the acetylcholine receptor3. If the autoantigen for a particular autoimmune disease is not known, investigators inject a crude protein extract from the organ targeted by the autoimmune reaction. For autoimmune hypophysitis, the pathogenic autoantigen(s) remain to be identified4, and thus a crude pituitary protein preparation is used. In this video article we demonstrate how to induce experimental autoimmune hypophysitis in SJL mice.

This video shows how to induce autoimmune hypophysitis in SJL mice and how to assess its severity by histopathology.

Autoimmune hypophysitis can be reproduced experimentally by the injection of pituitary proteins mixed with an adjuvant into susceptible mice1. Mouse ...

Genotypic Inference of HIV-1 Tropism Using Population-based Sequencing of V3

Background: Prior to receiving a drug from CCR5-antagonist class in HIV therapy, a patient must undergo an HIV tropism test to confirm that his or her viral population uses the CCR5 coreceptor for cellular entry, and not an alternative coreceptor. One approach to tropism testing is to examine the sequence of the V3 region of the HIV envelope, which interacts with the coreceptor.
Methods: Viral RNA is extracted from blood plasma. The V3 region is amplified in triplicate with nested reverse transcriptase-PCR. The amplifications are then sequenced and analyzed using the software, RE_Call. Sequences are then submitted to a bioinformatic algorithm such as geno2pheno to infer viral tropism from the V3 region. Sequences are inferred to be non-R5 if their geno2pheno false positive rate falls below 5.75%. If any one of the three sequences from a sample is inferred to be non-R5, the patient is unlikely to respond to a CCR5-antagonist.

HIV tropism can be inferred from the V3 region of the viral envelope. V3 is PCR amplified in triplicate using nested RT-PCR, sequenced, and interpreted using bioinformatic software. Samples with with 1 or more sequence(s) with low g2P scores are classified as non-R5 virus.

Background: Prior to receiving a drug from CCR5-antagonist class in HIV therapy, a patient must undergo an HIV tropism test to confirm that his or her ...

A Mouse Model for Pathogen-induced Chronic Inflammation at Local and Systemic Sites

Chronic inflammation is a major driver of pathological tissue damage and a unifying characteristic of many chronic diseases in humans including neoplastic, autoimmune, and chronic inflammatory diseases. Emerging evidence implicates pathogen-induced chronic inflammation in the development and progression of chronic diseases with a wide variety of clinical manifestations. Due to the complex and multifactorial etiology of chronic disease, designing experiments for proof of causality and the establishment of mechanistic links is nearly impossible in humans. An advantage of using animal models is that both genetic and environmental factors that may influence the course of a particular disease can be controlled. Thus, designing relevant animal models of infection represents a key step in identifying host and pathogen specific mechanisms that contribute to chronic inflammation.
Here we describe a mouse model of pathogen-induced chronic inflammation at local and systemic sites following infection with the oral pathogen Porphyromonas gingivalis, a bacterium closely associated with human periodontal disease. Oral infection of specific-pathogen free mice induces a local inflammatory response resulting in destruction of tooth supporting alveolar bone, a hallmark of periodontal disease. In an established mouse model of atherosclerosis, infection with P. gingivalis accelerates inflammatory plaque deposition within the aortic sinus and innominate artery, accompanied by activation of the vascular endothelium, an increased immune cell infiltrate, and elevated expression of inflammatory mediators within lesions. We detail methodologies for the assessment of inflammation at local and systemic sites. The use of transgenic mice and defined bacterial mutants makes this model particularly suitable for identifying both host and microbial factors involved in the initiation, progression, and outcome of disease. Additionally, the model can be used to screen for novel therapeutic strategies, including vaccination and pharmacological intervention.

Animal models have proven to be invaluable tools in defining host and pathogen specific mechanisms that contribute to the development of chronic inflammation. Here we describe a mouse model of oral infection with the human pathogen Porphyromonas gingivalis and detail methodologies to assess the progression of inflammation at local and systemic sites.

Chronic inflammation is a major driver of pathological tissue damage and a unifying characteristic of many chronic diseases in humans including ...

Injections of Lipopolysaccharide into Mice to Mimic Entrance of Microbial-derived Products After Intestinal Barrier Breach

The intestinal epithelial barrier separates the host from the microbiota that is normally tolerated or ignored. The breach of this barrier results in the entrance of bacteria or bacteria-derived products into the host, accessing the host circulation and inner organs leading to the uncontrolled inflammation as observed in patients with inflammatory bowel disease (IBD), that are characterized by an increased intestinal epithelial permeability.
To mimic the entrance of bacterial-derived compounds into the host, an endotoxemia model has been adopted in which lipopolysaccharide (LPS), a component of the outer cell wall of Gram-negative bacteria, were injected into mice. In this study, a sublethal dose of LPS was intraperitoneally injected and the mice were subsequently monitored for 8 h using a disease score. Furthermore, the expression levels of the inflammatory cytokines Il6, Il1b, and Tnfa were analyzed in the spleen, liver and colon by qPCR at different time points post LPS injection. This model could be useful for the studies involving investigation of immune responses after the invasion of microorganisms or bacterial-derived products caused by a barrier breach of body surfaces.

Here a protocol to mimic the entrance of bacterial-derived compounds after intestinal barrier breach is presented. A low sublethal dose of lipopolysaccharide was injected systemically into mice, which were monitored for 24 h post-injection. The expression of pro-inflammatory cytokines was determined at several time points in spleen, liver, and colon.

The intestinal epithelial barrier separates the host from the microbiota that is normally tolerated or ignored. The breach of this barrier results in the ...

Robust Ligature-Induced Model of Murine Periodontitis for the Evaluation of Oral Neutrophils

The main advantages of studying the pathophysiology of periodontal disease utilizing murine models are the reduced cost of animals, array of genetically modified strains, the vast number of analyses that can be performed on harvested soft and hard tissues. However, many of these systems are subject to procedural criticisms. As an alternative, the ligature-induced model of periodontal disease, driven by the localized development and retention of a dysbiotic oral microbiome, can be employed, which is rapidly induced and relatively reliable. Unfortunately, the variants of ligature-induced murine periodontitis protocol are isolated to focal regions of the periodontium and subject to premature avulsion of the installed ligature. This minimizes the amount of tissue available for subsequent analyses and increases the number of animals required for study. This protocol describes the precise manipulations required to place extended molar ligatures with improved retention and usage of a novel rinse technique to recover oral neutrophils in mice with an alternative approach that mitigates the aforementioned technical challenges.

This article presents a protocol for establishing a ligature-induced model of murine periodontitis involving multiple maxillary molars, resulting in larger areas of the involved gingival tissue and bone for subsequent analysis as well as reduced animal usage. A technique to assess oral neutrophils in a manner analogous to human subjects is also described.

The main advantages of studying the pathophysiology of periodontal disease utilizing murine models are the reduced cost of animals, array of genetically ...

Sub-acute Cerebral Microhemorrhages Induced by Lipopolysaccharide Injection in Rats

Cerebral microhemorrhages (CMHs) are common in aged patients and are correlated to various neuropsychiatric disorders. The etiology of CMHs is complex, and neuroinflammation is often observed as a co-occurrence. Here, we describe a sub-acute CMHs rat model induced by lipopolysaccharide (LPS) injection, as well as a method for detecting CMHs. Systemic LPS injection is relatively simple, economical, and cost-effective. One major advantage of LPS injection is its stability to induce inflammation. CMHs caused by LPS injection could be detected by gross observation, hematoxylin and eosin (HE) staining, Perl&#39;s Prussian staining, Evans blue (EB) double-labeling, and magnetic resonance imaging-susceptibility weighted imaging (MRI-SWI) technology. Finally, other methods of developing CMHs animal models, including their advantages and/or disadvantages, are also discussed in this report.

We present a protocol to induce and detect CMHs caused by LPS injection in Sprague-Dawley rats, which may be utilized in future research investigations on the pathogenesis of CMHs.

Cerebral microhemorrhages (CMHs) are common in aged patients and are correlated to various neuropsychiatric disorders. The etiology of CMHs is complex, ...

Neuroscience

Experimental Model of Ligature-Induced Peri-Implantitis in Mice

Dental implants have a high success and survival rate. However, complications such as peri-implantitis (PI) are highly challenging to treat. PI is characterized by inflammation in the tissues around dental implants with progressive loss of supporting bone. To optimize dental implants' longevity in terms of health and functionality, it is crucial to understand the peri-implantitis pathophysiology. In this regard, using mouse models in research has proven clear benefits in recreating clinical circumstances. This study aimed to describe an experimental model of ligature-induced peri-implantitis in mice and determine whether there is effectiveness in inducing this disease, given the observed bone and tissue changes. The experimental peri-implantitis induction comprehends the following steps: teeth extraction, implant placement, and ligature-inducted PI. A sample of eighteen 3-week-old C57BL/6J male mice was divided into two groups, ligature (N=9) and control non-ligature (N=9). The evaluation of clinical, radiographical, and histological factors was performed. The ligature group showed significantly higher bone loss, increased soft tissue edema, and apical epithelial migration than the non-ligature group. It was concluded that this pre-clinical model can successfully induce peri-implantitis in mice.

This is a report on an experimental model of ligature-induced peri-implantitis in mice. We describe all surgical steps, from pre- and post-operative management of the animals, extractions, implant placement, and ligature-induced peri-implantitis.

Dental implants have a high success and survival rate. However, complications such as peri-implantitis (PI) are highly challenging to treat. PI is ...

Inducing Apical Periodontitis in Mice

The mechanisms involved in local induced inflammation can be studied using several available animal models. One of these is the induction of apical periodontitis (AP). Apical periodontitis is a common pathology of an inflammatory nature in the periodontal tissues surrounding the tooth root. In order to better understand the nature and mechanism of this pathology it is advantageous to perform the procedure in mice. The induction of this odontogenic inflammation is achieved by drilling into the mouse tooth until the dental pulp is exposed. Next, the tooth pulp remains exposed to be contaminated by the natural oral flora over time, causing apical periodontitis. After this time period, the animal is sacrificed, and the tooth and the jaw bone can be analyzed in various ways. Typical analyses include micro-CT imaging (to evaluate bone resorption), histological staining, immunohistochemistry, and RNA expression. This protocol is useful for research in the field of oral biology to better understand this inflammatory process in an in vivo experimental setting with uniform conditions. The procedure requires a careful handling of the mice and the isolated jaw, and a visual demonstration of the technique is useful. All technical aspects of the procedures leading to induced apical periodontitis and its characterization in a mouse model are demonstrated.

Here, we present a protocol to locally induce apical periodontitis in mice. We show how to drill a hole in the mouse&#39;s tooth and expose its pulp, in order to cause local inflammation. Analysis methods to investigate the nature of this inflammation, such as micro-CT and histology, are also demonstrated.

The mechanisms involved in local induced inflammation can be studied using several available animal models. One of these is the induction of apical ...

Biology

Induction of Cerebral Microhemorrhages in a Rat Model Using Lipopolysaccharide

Source: Li, D., et al. <a href="https://app.jove.com/v/58423">Sub-acute Cerebral Microhemorrhages Induced by Lipopolysaccharide Injection in Rats.</a> J. Vis. Exp. (2018).
This video demonstrates the process of inducing blood-brain barrier (BBB) disruption and cerebral microhemorrhages in a rat model using lipopolysaccharide (LPS). It highlights the sequence of immune responses that lead to increased BBB permeability and subsequent brain tissue damage.

All procedures involving animal models have been reviewed by the local institutional animal care committee and the JoVE veterinary review board.
1. ...

Induction of Periodontitis via a Combination of Ligature and Lipopolysaccharide Injection in a Rat Model

Summary

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Chapters in this video

Preparation of Mouse Pituitary Immunogen for the Induction of Experimental Autoimmune Hypophysitis

Induction of Experimental Autoimmune Hypophysitis in SJL Mice

Genotypic Inference of HIV-1 Tropism Using Population-based Sequencing of V3

A Mouse Model for Pathogen-induced Chronic Inflammation at Local and Systemic Sites

Injections of Lipopolysaccharide into Mice to Mimic Entrance of Microbial-derived Products After Intestinal Barrier Breach

Robust Ligature-Induced Model of Murine Periodontitis for the Evaluation of Oral Neutrophils

Sub-acute Cerebral Microhemorrhages Induced by Lipopolysaccharide Injection in Rats

Experimental Model of Ligature-Induced Peri-Implantitis in Mice

Inducing Apical Periodontitis in Mice

Induction of Cerebral Microhemorrhages in a Rat Model Using Lipopolysaccharide