Name: visualization of metabolites identified in the spatial metabolome of traditional chinese medicine using desi-msi
Uploaded: 2022-12-16T14:50:00
Description: Watch this Scientific Journal Video about Visualization of Metabolites Identified in the Spatial Metabolome of Traditional Chinese Medicine Using DESI-MSI at JoVE.com

This work was supported by the Natural Science Foundation of Sichuan province (No. 2022NSFSC0171) and the Xinglin Talent Program of Chengdu University of TCM (No. 030058042).

1. Sample preparation
<ol>
	<li>Collect cleaned roots and leaves from a 2-year-old Salvia miltiorrhiza plant&#160;(Figure 1A), and directly slice at a cross-sectional thickness of approximately 3-5 mm by hand. Then, stick the sample onto an adhesion microscope glass slide using double-sided tape (Figure 1B). 
	NOTE: Ensure the size of the double-sided tape is bigger than the sample. If the tissues are dried, soak them in water or...

<ol>
	<li>Buchberger, A. R., DeLaney, K., Johnson, J., Li, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mass+spectrometry+imaging:+a+review+of+emerging+advancements+and+future+insights.">Mass spectrometry imaging: a review of emerging advancements and future insights.</a> Analytical Chemistry. 90 (1), 240-265 (2018).</li><li>Karlsson, O., Hanrieder, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Imaging+mass+spectrometry+in+drug+development+and+toxicology.">Imaging mass spectrometry in drug development and toxicology.</a> Archives of Toxicology. 91 (6), 2283-2294 (2016).</li><li>Qiu, Z. -. 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The emergence of MS technology has opened a new insight in natural product research at the molecular level during recent years24. The MS instrument, with its high sensitivity and high throughput, enables targeted and untargeted analysis of metabolites in natural products, even with trace concentration25. Therefore, MS is currently widely used in the field of traditional Chinese medicine (TCM) chemistry. The qualitative and quantitative research on the chemical composition o...

Visualization of metabolite distribution has become a crucial topic in plant science, especially in traditional Chinese medicine, as it unveils the formation process of specific metabolites within the plant. With reference to traditional Chinese medicine (TCM), it provides information regarding the active components and guides the application of plant parts in pharmaceutical applications. Normally, visualization of metabolites is achieved by in situ hybridization, fluorescence microscopy, or immunohistochemistry, however the number of compounds detected by these experiments conveys limited chemical information. Combined with tissue staining, mass spectrometry imaging (MSI) can provide large amount of data and supply spatial distribution information of compounds by scanning and analyzing tissue slices at micron-level1. MSI uses analytes for desorption and ionization from the sample surface, followed by mass analysis of the resulting vapor phase ions and application of imaging software to integrate the information and plot a two-dimensional image recording a specific ion abundance. This technology can determine both exogenous and endogenous molecules by detecting the characteristic distribution of drugs and their induced metabolites in target tissues and organs2,3,4,5.
Various imaging MS modalities have been developed over recent decades; the most prominent among them are desorption electrospray ionization-based MSI (DESI-MSI), matrix-assisted laser desorption/ionization (MALDI), and secondary ion mass spectrometry (SIMS)6. DESI-MSI is often used in biological research due to its atmospheric operation, high throughput, and higher accuracy7. MALDI has been applied to identify a transthyretin fragment as a potential nephrotoxic biomarker for gentamicin and to analyze the distribution of the neurotoxic metabolite 1-methyl-4-phenylpyridinium after the management of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine in mice brains8,9. MALDI and DESI have been used to determine the composition of drug-induced crystal-like structures in the kidney of dosed rabbits; these structures are mainly composed of metabolites formed due to the demethylation and/or oxidation of the drug10. Additionally, MSI has been applied in the localization of metabolic distribution of drug toxicity in target organs. However, the cells in plant tissue vary and are different from animals and require special sectioning procedures.
In plants, by using MALDI imaging, so far, the distribution of different compounds in wheat (Triticum aestivum) stem, soya bean (Glycine max), rice (Oryza sativa) seeds, Arabidopsis thaliana flowers and roots, and barley (Hordeum vulgare) seeds have been analyzed11,12,13,14,15,16,17,18. Recent studies have reported that DESI-MSI is emerging in the metabolite analysis of natural drugs and products, especially in TCMs such as Ginkgo biloba, Fuzi, and Artemisia annua L19,20,21. In these studies, the protocols for the preparation of plant material samples differ, and some require more complex equipment, like a freezing microtome. DESI-MSI has strict requirements for the surface flatness of the detected sample. When analyzing the organ or tissue of an animal, the sample is usually made by cryo-sectioning22. However, the procedure for cryo-sectioning is complicated and more expensive, and the commonly used adhesive optimal cutting temperature (OCT) method has a strong signal when imaging. In addition, the medicinal tissues of TCM vary; for instance, the root of Salvia miltiorrhiza, known as&#160;Danshen in Chinese, is medicinally used, while in Zisu (Perilla frutescens), the leaf is used23,24. Therefore, it is necessary to improve the sample preparation procedures to promote the utilization of DESI in metabolite analysis for TCM.
As a perennial herb and a commonly used TCM, S. miltiorrhiza was initially recorded in the oldest medicine monograph, Shennong&#39;s Classic of Materia Medica (known as Shennong Bencao Jing in Chinese). In this study, we optimized sectioning and DESI imaging procedures and developed a more cost-effective method to identify the distribution and categorize the compounds in tissues of S. miltiorrhiza. This method can also overcome the disadvantages associated with dry tissues - that they usually easily fracture under the nitrogen blow - and promote the development of TCM. The study will promote the standardization of TCM/ethnic medicine for research-related technologies.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>2-Propanol</td>
			<td>Fisher</td>
			<td>CAS:67-63-0</td>
			<td>HPLC grade</td>
		</tr>
		<tr>
			<td>Acetonitrile</td>
			<td>Sigma-aldrich</td>
			<td>Number-75-05-8</td>
			<td>LC-MS grade</td>
		</tr>
		<tr>
			<td>Adhesion Microscope slides</td>
			<td>Citotest scientific</td>
			<td>80312-3161</td>
			<td>Microscope glass slides&#160; can adhere to&#160; the sample&#160;</td>
		</tr>
		<tr>
			<td>Air cooled dry vacuum pump</td>
			<td>EYELA</td>
			<td>FDU-2110</td>
			<td>Air-vaccum equipment at -80&#176;C</td>
		</tr>
		<tr>
			<td>Formic Acid</td>
			<td>ACS</td>
			<td>F1089 | 64-18-6</td>
			<td>LC-MS grade</td>
		</tr>
		<tr>
			<td>LE (Leucine Enkephalin)</td>
			<td>Waters</td>
			<td>186006013-1</td>
			<td>LC-MS grade</td>
		</tr>
		<tr>
			<td>Methanol</td>
			<td>Sigma-aldrich</td>
			<td>Number-67-56-1</td>
			<td>LC-MS grade</td>
		</tr>
		<tr>
			<td>Parafilm&#160;</td>
			<td>Bemis Company</td>
			<td>sc-200288</td>
			<td>Laboratory Sealing Film</td>
		</tr>
		<tr>
			<td>Paraformaldehyde</td>
			<td>Sigma-aldrich</td>
			<td>V900894</td>
			<td>Reagent grade</td>
		</tr>
		<tr>
			<td>Q-Tof Mass Spectrometer with DESI source</td>
			<td>Waters</td>
			<td>Synapt XS</td>
			<td></td>
		</tr>
	</tbody>
</table>

visualization of metabolites identified in the spatial metabolome of traditional chinese medicine using desi-msi

The medicinal use of traditional Chinese medicine is mainly due to its secondary metabolites. Visualization of the distribution of these metabolites has become a crucial topic in plant science. Mass spectrometry imaging can extract huge volumes of data and provide spatial distribution information about these by analyzing tissue slices. With the advantage of high throughput and higher accuracy, desorption electrospray ionization mass spectrometry imaging (DESI-MSI) is often used in biological research and in the study of traditional Chinese medicine. However, the procedures used in this research are complicated and not affordable. In this study, we optimized sectioning and DESI imaging procedures and developed a more cost-effective method to identify the distribution of metabolites and categorize these compounds in plant tissues, with a special focus on traditional Chinese medicines. The study will promote the utilization of DESI in metabolite analysis and standardization of traditional Chinese medicine/ethnic medicine for research-related technologies.

This protocol can lead to the identification and distribution of compounds in plant samples. In the MS image of a specific m/z, the color of every single pixel represents the relative intensity of the m/z, thus can be associated with the natural distribution and the abundance of the metabolite ion throughout the sample. The higher the abundance of the chemical at the collecting position, the brighter the color is. The bar in the picture (Figure 4A-D) shows t...

Watch this Scientific Journal Video about Visualization of Metabolites Identified in the Spatial Metabolome of Traditional Chinese Medicine Using DESI-MSI at JoVE.com

Visualization of Metabolites Identified in the Spatial Metabolome of Traditional Chinese Medicine Using DESI-MSI

In this study, a series of methods are presented to prepare DESI-MSI samples from plants, and a procedure of DESI assembly installation, MSI data acquisition, and processing is described in detail. This protocol can be applied in several conditions for acquiring spatial metabolome information in plants.

The medicinal use of traditional Chinese medicine is mainly due to its secondary metabolites. Visualization of the distribution of these metabolites has ...

This article mainly describes a cost-effective method of preparing plant samples and imaging using DESI-MSI, and can overcome the disadvantages associated with dry tissues, which easily fracture when nitrogen blow in. The root was cryosectioned on the cryostat microtome, whereas the leaf was prepared by imprinting, which requires expensive machine or loses signal intensity. Our method can overcome these limitations.This method can be used in spatial metabolomics of plants such as distribution and movement of toxicants in plants under abiotic and biotic stress. To begin, take cleaned roots and leaves from a two-year-old salvia miltiorrhiza plant and directly slice at a cross-sectional thickness of approximately three to five millimeters. Then, stick the sample onto an adhesion microscope glass slide using double-sided tape.Place another microscope glass slide above the sample and wrap them with a sealing film like a sandwich. Next, freeze the sandwich sample at minus 80 degrees Celsius for at least four hours, then subject it to an air vacuum for two hours with the trapped temperature at minus 75 to minus 82 degrees Celsius and vacuum gauge at 2.5 to 3.7 pascal. For analysis, after removing the samples from the cold storage, bring them to room temperature in a desiccator to avoid condensation on the sample surface before subjecting the sample to matrix application.Implement the instruments detector setup and mass calibration in electrospray ionization, or ESI mode. Carry out detector setup using leucine and cephalin in water acetonitrile at a ratio of one to one, and perform mass calibration with sodium formate and water isopropanol at a ratio of one to one. Take the ESI source out and mount the DESI unit onto the mass spectrometer.Connect the nitrogen gas supply to the DESI unit and adjust the gas pressure to around 0.5 megapascal. Fill a five milliliter syringe with leucine and cephalin and formic acid in water methanol at a ratio of one to nine, and attach the syringe to the high performance syringe pump to provide solvent for ionization of the chemicals in the sample. Next, attach a solvent-providing capillary to the syringe and the DESI sprayer.The solvent providing capillary is a standard capillary of dimensions with a 75 micrometer internal diameter and 375 micrometer outside diameter. Start the syringe pump and set the infuse rate to two microliters per minute to get a constant flow and spray of the solvent. Turn off the nitrogen gas valve and then turn it on after about 15 seconds.A small drop of solvent blows out onto the stage and spray can be seen if the solvent flow is in a constant state. Next, adjust the position of the sprayer in terms of the spray angle, XYZ axis, protrusion, and height. Use red and black markers as references to optimize the mass spectrometry signal to get a signal intensity of around one times 10 to the fifth in sensitivity mode.As the protrusion of the sprayer is the most significant factor that affects the signal intensity, adjust the protrusion by changing the nitrogen gas guard using a five millimeter wrench. Spray direction influences the quality of the mass image. Hence, rotate the sprayer until the spray is straight.After all these steps, the setup is ready for experiments and is normally stable for approximately three weeks of usability after the initial setup. For DESI-MS imaging, no sample pre-treatment is required. However, remove the excess media on the slides if possible.Take an image of the sample on the slide. Without touching the sample's surface to avoid any impurity, place the slide on the plate position on the DESI stage, which has two plate positions, A and B.Use standard slides or a full slide to fit in the position. A full slide can accommodate up to four slides and thus has a much larger area for experiments.Open the high definition mass image processing software. Set a new plate in the Acquire tab, and select the right plate position, A or B, and the plate type. On the Image Select page, select the four corners of the slide, and then the image is auto adjusted to the correct orientation.To set the MS parameters, select the experiment type as DESI-MS mode that is commonly used in which only the parent ion will be detected. Next, select the polarity as either positive or negative as the instrument can use only one polarity in an experiment. Then apply the sensitivity mode to get more information on chemicals in small amounts.Next, draw a rectangle to define the scanning area in the Pattern tab, and set the pixel size by keeping the X and Y sizes of the pixel equal. Set the scanning rate to no more than five times the pixel size. Save the project and export a worksheet for the MS acquisition software.Next, import the worksheet into the MS acquisition software and save it as a new sample list. Press Start Run to begin the MS image scanning, and multiple images can be added to the experiment queue by importing more worksheets. Load the data file of the sample into the mass image processing software and set the parameters for DESI image processing.As leucine and cephalin was used for internal lock mass, and the lock mass is the only point to identify the polarity of the experiment, it is crucial to set the correct lock mass. Set 556.2772 for positive mode and 554.2620 for negative mode. To build a list of target chemicals, load the processed data file to visualize the DESI image of the sample.Click the Normalization button to normalize the data by total ion chromatography to get the relative intensity of a specific chemical to the reference, and then different samples can be compared with each other. Draw a region of interest, or ROI, and copy several copies on the sample image. Then select all the ROIs and export multivariate analysis to extract MS information from all ROIs.Mass spectrometry imaging of the root and whole leaf sections shows the spatial distribution of the selected compounds. The color of every single pixel represents the relative intensity of the mass to charge ratio, and thus can be associated with the natural distribution and the abundance of the metabolite ion throughout the sample. The distribution of the target compounds, tanshinone IIA and rosmarinic acid, is visible in different areas of the root.The compound tanshinol A was detected in the leaf sections As a protocol aiming for reproducibility, the most important thing is to optimize the signal intensity by adjusting the position of the sprayer in several dimensions.

visualization-metabolites-identified-spatial-metabolome-traditional

Research

JoVE Journal

Medicine

An In Vitro Dissolution Determination of Multi-Index Components in Tibetan Medicine Rhodiola Granules

The composition of the Tibetan medicine Rhodiola granules (RG) is complex, and the overall quality of RG is difficult to determine. Therefore, establishing a method to determine the multi-component in vitro dissolution of RG is of great significance for quality control. This study uses the second paddle method of the fourth general rule 0931 from the Chinese Pharmacopoeia (2020 edition), compliant with apparatus 2 of the United States Pharmacopeia (USP). The dissolution apparatus was set to a rotation speed of 100 rpm with ultrapure water as the dissolution medium. A sample volume of 1 mL was collected at each timepoint. Furthermore, the cumulative dissolution of gallic acid, salidroside, and ethyl gallic acid in RG at different time points was determined by high-performance liquid chromatography (HPLC). Finally, the dissolution curves were drawn, and the curves were fitted to the GompertzMod, the Gompertz, the Logistic, and the Weibull equations. The results showed that the cumulative dissolution of gallic acid in RG was over 80% at 1 min, the cumulative dissolution of salidroside and ethyl gallic acid was over 65% at 5 min, and the cumulative dissolution of each index component decreased after 30 min. The curve fitting demonstrated that the GompertzMod equation was the best-fitting model for each index component of RG. In conclusion, the dissolution test method described in this protocol is simple, accurate, and reliable. It can characterize the dissolution behavior of the index components in RG in vitro, which provides a methodological reference for quality control of RG and quality evaluation of other ethnic compounds.

An In Vitro Dissolution Determination of Multi-Index Components in Tibetan Medicine Rhodiola Granules

Here, we test the dissolution of Rhodiola granules (RG) in vitro, draw dissolution curves of salidroside, gallic acid, and ethyl gallate in ultrapure water, and fit the curves to different mathematical models. This protocol provides information and guidance for in vivo bioequivalence and in vivo-in vitro correlation studies of RG.

The composition of the Tibetan medicine Rhodiola granules (RG) is complex, and the overall quality of RG is difficult to determine. Therefore, ...

Enema of Traditional Chinese Medicine for Patients with Severe Acute Pancreatitis

Severe acute pancreatitis (SAP) is characterized by high mortality rates, numerous complications, and extreme difficulties in treatment. A traditional Chinese medicine (TCM) enema has been widely utilized in clinical and experimental studies of SAP. It has been demonstrated to have beneficial effects in protecting pancreatic function and delaying disease progression. The procedure of TCM enema is to perfuse the Chinese medicinal liquid of raw rhubarb (Rheum officinale Baill. DaHuang) from the anus into the rectum and colon. Basic steps of the procedure include boiling the herbal solution in advance, using a disposable enema kit to assist patients in taking a left lying position, raising the patient's hip 10 cm, and carefully inserting the enema 30-35 cm into the anus, with a drip speed of 60-80 drops/min. The medicine liquid temperature should be equivalent to the patient's body temperature, typically between 37-39 &#176;C. The end of the enema operation should be slow, and Tui na (massage therapy) should be administered before extubation. The medication liquid should be kept in the rectum for more than 1 h. After issuing an enema, it is essential to observe the patient's feces and abdomen, and to evaluate the remission of abdominal signs and symptoms.

An enema is a type of traditional Chinese medicine (TCM) therapy used to treat severe acute pancreatitis (SAP). The therapy involves instilling a TCM liquid into the rectum and colon through the anus to keep the liquid in the intestine, absorbing through the intestinal mucosa. This study aims to standardize the enema procedure for SAP patients.

Severe acute pancreatitis (SAP) is characterized by high mortality rates, numerous complications, and extreme difficulties in treatment. A traditional ...

Network Pharmacology Prediction and Metabolomics Validation of the Mechanism of Fructus Phyllanthi against Hyperlipidemia

Hyperlipidemia has become a leading risk factor for cardiovascular diseases and liver injury worldwide. Fructus Phyllanthi (FP) is an effective drug against hyperlipidemia in Traditional Chinese Medicine (TCM) and Indian Medicine theories, however the potential mechanism requires further exploration. The present research aims to reveal the mechanism of FP against hyperlipidemia based on an integrated strategy combining network pharmacology prediction with metabolomics validation. A high-fat diet (HFD)-induced mice model was established by evaluating the plasma lipid levels, including total cholesterol (TC), triglyceride (TG), low-density lipoprotein cholesterol (LDL-C), and high-density lipoprotein cholesterol (HDL-C). Network pharmacology was applied to find out the active ingredients of FP and potential targets against hyperlipidemia. Metabolomics of plasma and liver were performed to identify differential metabolites and their corresponding pathways among the normal group, model group, and intervention group. The relationship between network pharmacology and metabolomics was further constructed to obtain a comprehensive view of the process of FP against hyperlipidemia. The obtained key target proteins were verified by molecular docking. These results reflected that FP improved the plasma lipid levels and liver injury of hyperlipidemia induced by a HFD. Gallic acid, quercetin, and beta-sitosterol in FP were demonstrated as the key active compounds. A total of 16 and six potential differential metabolites in plasma and liver, respectively, were found to be involved in the therapeutic effects of FP against hyperlipidemia by metabolomics. Further, integration analysis indicated that the intervention effects were associated with CYP1A1, AChE, and MGAM, as well as the adjustment of L-kynurenine, corticosterone, acetylcholine, and raffinose, mainly involving tryptophan metabolism pathway. Molecular docking ensured that the above ingredients acting on hyperlipidemia-related protein targets played a key role in lowering lipids. In summary, this research provided a new possibility for preventing and treating hyperlipidemia.

The present protocol describes an integrated strategy for exploring the key targets and mechanisms of Fructus Phyllanthi against hyperlipidemia based on network pharmacology prediction and metabolomics verification.

Hyperlipidemia has become a leading risk factor for cardiovascular diseases and liver injury worldwide. Fructus Phyllanthi (FP) is an effective drug ...

Objectification of Tongue Diagnosis in Traditional Medicine, Data Analysis, and Study Application

Tongue diagnosis is an essential technique of traditional Chinese medicine (TCM) diagnosis, and the need for objectifying tongue images through image processing technology is growing. The present study provides an overview of the progress made in tongue objectification over the past decade and compares segmentation models. Various deep learning models are constructed to verify and compare algorithms using real tongue image sets. The strengths and weaknesses of each model are analyzed. The findings indicate that the U-Net algorithm outperforms other models regarding precision accuracy (PA), recall, and mean intersection over union (MIoU) metrics. However, despite the significant progress in tongue image acquisition and processing, a uniform standard for objectifying tongue diagnosis has yet to be established. To facilitate the widespread application of tongue images captured using mobile devices in tongue diagnosis objectification, further research could address the challenges posed by tongue images captured in complex environments.

The present study employed U-Net and other deep learning algorithms to segment a tongue image and compared the segmentation results to investigate the objectification of tongue diagnosis.

Tongue diagnosis is an essential technique of traditional Chinese medicine (TCM) diagnosis, and the need for objectifying tongue images through image ...

A Traditional Chinese Medicine Characteristic Therapy for Bronchial Asthma: Moxibustion

Bronchial asthma is a chronic inflammatory disease of the airway which can lead to symptoms such as recurrent wheezing, shortness of breath, chest tightness, or cough, as a result of increased airway reactivity. With high diurnal variation, these symptoms often occur or worsen at night or in the morning. By burning and roasting the Chinese medica above human acupoints, moxibustion is a type of treatment that stimulates the activity of the human meridians through drugs and heat stimulation to prevent and treat diseases. According to the principle of syndrome differentiation and treatment of traditional Chinese medicine, acupoints are selected on the corresponding parts, which has a definite effect. It is regarded as a characteristic traditional Chinese medicine therapy for bronchial asthma. This protocol elaborates the methods and steps of patient management, material preparation, selection of acupoints, operation, and postoperative nursing to ensure safe and effective moxibustion treatment to significantly improve the clinical symptoms and quality of life of patients with bronchial asthma.

This protocol presents a curative procedure of moxibustion in treating patients with bronchial asthma.

Bronchial asthma is a chronic inflammatory disease of the airway which can lead to symptoms such as recurrent wheezing, shortness of breath, chest ...

Liujunzi Decoction: An Effective Treatment for UC-CRC Prevention

Establishment of Coloproctitis Cancer Model in Mice and Evaluation of Therapeutic Effect of Chinese Medicine

Colorectal cancer (CRC) is a common malignancy of the digestive system and has become the third most common malignancy worldwide and the second leading cause of malignancy-related death. Ulcerative coloproctitis (UC) is a precancerous lesion, and UC-associated CRC (UC-CRC) is the most common subtype of CRC. Therefore, a reasonable UC-CRC model is the cornerstone and guarantee of new drug development. Traditional Chinese medicine (TCM) has been widely used in the treatment of UC-CRC due to its good efficacy. As a classic tonic prescription of TCM, Liujunzi decoction (LJZD) has been widely used in the treatment of UC-CRC. In this study, a UC-CRC model was established by combining azomethane and dextran sulfate sodium, and the LJZD was administered. The data confirmed that LJZD can effectively inhibit cancer transition in UC-CRC by using mouse body weight, colorectal length, pathological and inflammatory factors, colorectal barrier function, and cancer markers. This protocol provides a system for evaluating the efficacy of TCM in the prevention and treatment of UC-CRC.

Author Spotlight: Liujunzi Decoction as a Traditional Chinese Treatment for Coloproctitis Cancer

This protocol provides a mouse model of ulcerative coloproctitis-associated colorectal cancer induced by azomethane combined with dextran sulfate sodium. The model was used to evaluate the efficacy of traditional Chinese medicine compounds in the prevention and treatment of colorectal cancer.

Colorectal cancer (CRC) is a common malignancy of the digestive system and has become the third most common malignancy worldwide and the second leading ...

Analyzing Tibetan Medicinal Plant APB Using 2D-HPLC-MS with Molecular Networking

2D-HPLC-MS Technology Combined with Molecular Network for the Identification of Components in Tibetan Medicine Aconitum pendulum

In this study, a comprehensive approach was employed, utilizing 2D-HPLC-MS technology in conjunction with the molecular network to unravel the intricate chemical composition of the Tibetan medicinal plant APB. Through the implementation of 2D-HPLC, enhanced separation of complex mixtures was achieved, enabling the isolation of individual compounds for subsequent analysis. The molecular network approach further aided in elucidating structural relationships among these compounds, contributing to the determination of potential bioactive molecules. This integrated strategy efficiently identified a wide array of chemical components present within the plant. The findings revealed a diverse spectrum of chemical constituents within APB, including alkaloids, among others. This research not only advances understanding of the phytochemical profile of this traditional Tibetan medicine but also provides valuable insights into its potential therapeutic properties. The integration of 2D-HPLC-MS and molecular network proves to be a powerful tool for systematically exploring and identifying complex chemical compositions in herbal medicines, paving the way for further research and development in the field of natural product discovery.

Author Spotlight: Integrating 2D-HPLC-MS and Molecular Networking in Natural Medicine Analysis

This study utilizes two-dimensional high-performance liquid chromatography-mass spectrometry (2D-HPLC-MS) technology in conjunction with molecular networking to unravel the intricate chemical composition of the Tibetan medicinal plant Aconitum pendulum Busch (APB). The article provides a detailed protocol for the systematic exploration and identification of complex chemical components of herbal medicines.

In this study, a comprehensive approach was employed, utilizing 2D-HPLC-MS technology in conjunction with the molecular network to unravel the intricate ...

Therapeutic Potential of Tuina Massage for Knee Osteoarthritis

Tuina Intervention in Sodium Monoiodoacetate Injection-Induced Rat Model of Knee Osteoarthritis

Knee osteoarthritis (KOA), a common degenerative joint disorder, is characterized by chronic pain and disability, which can progress to irreparable structural damage of the joint. Investigations into the link between articular cartilage, muscles, synovium, and other tissues surrounding the knee joint in KOA are of great importance. Currently, managing KOA includes lifestyle modifications, exercise, medication, and surgical interventions; however, the elucidation of the intricate mechanisms underlying KOA-related pain is still lacking. Consequently, KOA pain remains a key clinical challenge and a therapeutic priority. Tuina has been found to have a regulatory effect on the motor, immune, and endocrine systems, prompting the exploration of whether Tuina could alleviate KOA symptoms, caused by the upregulation of inflammatory factors, and further, if the inflammatory factors in skeletal muscle can augment the progression of KOA.
We randomized 32 male Sprague Dawley (SD) rats (180-220 g) into four groups of eight animals each: antiPD-L1+Tuina (group A), model (group B), Tuina (group C), and sham surgery (group D). For groups A, B, and C, we injected 25 &#181;L of sodium monoiodoacetate (MIA) solution (4 mg MIA diluted in 25 &#181;L of sterile saline solution) into the right knee joint cavity, and for group D, the same amount of sterile physiological saline was injected. All the groups were evaluated using the least to most stressful tests (paw mechanical withdrawal threshold, paw withdrawal thermal latency, swelling of the right knee joint, Lequesne MG score, skin temperature) before injection and 2, 9, and 16 days after injection.

Author Spotlight: Treating Knee Osteoarthritis with Tuina - A New Perspective 

This protocol describes the methods of Tuina intervention in sodium monoiodoacetate injection-induced rat model of knee osteoarthritis (KOA), which provides a reference for the application of Tuina in KOA animal models. This protocol also studies the effective mechanism of Tuina for KOA, and the results will help promote its application.

Knee osteoarthritis (KOA), a common degenerative joint disorder, is characterized by chronic pain and disability, which can progress to irreparable ...

Enhancing Pulmonary Infection Treatment Using M-ROSE

Microbiological Rapid On-Site Evaluation for Pulmonary Infectious Diseases

The prompt initiation of empirical anti-infective therapy is crucial in patients presenting with unexplained pulmonary infection. Although imaging acquisition is relatively straightforward in clinical practice, its lack of specificity often necessitates additional time-consuming tests such as sputum culture, bronchoalveolar-lavage fluid culture, or genetic sequencing to identify the underlying etiology of the disease accurately. Moreover, the limited efficacy of empirical anti-infective treatment may contribute to antibiotic misuse. Recent advancements in interpreting microbial background on rapid on-site evaluation (ROSE) slides have enabled clinicians to promptly obtain samples through bronchoscopy (e.g., alveolar lavage, mucosal brushing, tissue clamp), facilitating bedside staining and interpretation that provides essential microbial background information. Consequently, this establishes a foundation for developing targeted anti-infection treatment and individualized drug therapy plans. With a better understanding of which pathogens are causing infections in real-time, physicians can avoid unnecessary broad-spectrum antibiotics contributing to antibiotic resistance. Establishing a rapid and standardized M-ROSE workflow within respiratory medicine departments or intensive care units will greatly assist physicians in formulating accurate treatment strategies for patients, which holds significant clinical implications.

Author Spotlight: Advancing Pathogen Detection and Disease Assessment in Real-Time Using M-ROSE

The protocol here demonstrates a fast and standardized microbiological rapid on-site evaluation (M-ROSE) workflow, including three steps: slide making, staining, and interpretation. This protocol will help physicians make rapid clinical decisions.

The prompt initiation of empirical anti-infective therapy is crucial in patients presenting with unexplained pulmonary infection. Although imaging ...

Desmodium caudatum Decoction's Impact on Intestinal Microbiota of Rats

Effects of Desmodium caudatum on Gastrointestinal Hormones and Intestinal Flora in Rats with Gastritis

In order to preliminarily explore the effects of Desmodium caudatum on gastritis and intestinal flora in rats, a chronic gastritis rat model was established using the classic sodium salicylate method. Eighteen SPF rats were divided into three groups: the control group (Group C), the model group (Group M), and the treatment group (Group T). Pathological sections of the gastric wall were taken from rats in each group. Furthermore, the concentrations of gastrin and malondialdehyde in the serum of rats in each group were determined by ELISA. Additionally, the effects of D. caudatum on the intestinal flora of rats with gastritis were explored through a detailed comparison of gut bacterial communities in the three groups, employing Illumina-based 16S rRNA gene sequencing. The results indicated that D. caudatum decoction could reduce the malondialdehyde content and increase the gastrin content. Moreover, D. caudatum decoction was found to enhance the diversity and abundance of intestinal flora, exerting a positive impact on the treatment of gastritis by regulating and restoring the intestinal flora.

Author Spotlight: Exploring the Mysteries of Sichuan's Herbal Medicine in Chinese Medicine Research

The present protocol describes the method for analyzing intestinal flora using Illumina-based 16S rRNA gene sequencing and provides a framework for evaluating the effectiveness of herbal decoctions.