We thank Mr Gr&#233;gory Schneiter for technical assistance with flow cytometry data; Professor Muriel Cuendet (Laboratory of Pharmacognosy, School of Pharmaceutical Sciences, and University of Geneva) for allowing the use of the Attune flow cytometer and the Cytation 3 high-throughput microscope; Professor Brigitte Pittet for scientific advices.

The study protocol complied with the Declaration of Helsinki, and all patients provided written informed consent before participating in the study. Skin samples are obtained from healthy women undergoing abdominoplasty in the Plastic, Reconstructive and Aesthetic Surgery Department at Geneva University Hospitals (Geneva, Switzerland). The procedure conforms to the principles of the Declaration of Helsinki and was approved by the local institutional ethics committee (protocol #3126).
1. Preparati...

<ol>
	<li>Kumar, S., Mahajan, B. B., Kaur, S., Singh, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autologous+therapies+in+dermatology.">Autologous therapies in dermatology.</a> The Journal of Clinical and Aesthetic Dermatology. 7 (12), 38-45 (2014).</li><li>Martin, I., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+survey+on+cellular+and+engineered+tissue+therapies+in+Europe+in+2009.">The survey on cellular and engineered tissue therapies in Europe in 2009.</a> Tissue Engineering. Part A. 17 (17-18), 2221-2230 (2011).</li><li>Stunova, A., Vistejnova, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dermal+fibroblasts-A+heterogeneous+population+with+regulatory+function+in+wound+healing.">Dermal fibroblasts-A heterogeneous population with regulatory function in wound healing.</a> Cytokine &amp; Growth Factor Reviews. 39, 137-150 (2018).</li><li>Thangapazham, R. L., Darling, T. N., Meyerle, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Alteration+of+skin+properties+with+autologous+dermal+fibroblasts.">Alteration of skin properties with autologous dermal fibroblasts.</a> International Journal of Biological Sciences. 15 (5), 8407-8427 (2014).</li><li>Costa-Almeida, R., Soares, R., Granja, P. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fibroblasts+as+maestros+orchestrating+tissue+regeneration.">Fibroblasts as maestros orchestrating tissue regeneration.</a> Journal of Tissue Engineering and Regenerative Medicine. 12 (1), 240-251 (2018).</li><li>Weiss, R. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autologous+cell+therapy:+will+it+replace+dermal+fillers.">Autologous cell therapy: will it replace dermal fillers.</a> Facial Plastic Surgery Clinics of North America. 21 (2), 299-304 (2013).</li><li>Ichim, T. E., O'Heeron, P., Kesari, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fibroblasts+as+a+practical+alternative+to+mesenchymal+stem+cells.">Fibroblasts as a practical alternative to mesenchymal stem cells.</a> Journal of Translational Medicine. 16 (1), 212 (2018).</li><li>Gstraunthaler, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Alternatives+to+the+use+of+fetal+bovine+serum:+serum-free+cell+culture.">Alternatives to the use of fetal bovine serum: serum-free cell culture.</a> ALTEX. 20 (4), 275-281 (2003).</li><li>Karnieli, O., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+consensus+introduction+to+serum+replacements+and+serum-free+media+for+cellular+therapies.">A consensus introduction to serum replacements and serum-free media for cellular therapies.</a> Cytotherapy. 19 (2), 155-169 (2017).</li><li>van der Valk, J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fetal+Bovine+Serum+(FBS):+Past+-+Present+-+Future.">Fetal Bovine Serum (FBS): Past - Present - Future.</a> ALTEX. 35 (1), 99-118 (2018).</li><li>Cavallo, C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Platelet-Rich+Plasma:+The+Choice+of+Activation+Method+Affects+the+Release+of+Bioactive+Molecules.">Platelet-Rich Plasma: The Choice of Activation Method Affects the Release of Bioactive Molecules.</a> BioMed Research International. 2016, 6591717 (2016).</li><li>Peng, G. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Platelet-Rich+Plasma+for+Skin+Rejuvenation:+Facts,+Fiction,+and+Pearls+for+Practice.">Platelet-Rich Plasma for Skin Rejuvenation: Facts, Fiction, and Pearls for Practice.</a> Facial Plastic Surgery Clinics of North America. 27 (3), 405-411 (2019).</li><li>Fadadu, P. P., Mazzola, A. J., Hunter, C. W., Davis, T. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Review+of+concentration+yields+in+commercially+available+platelet-rich+plasma+(PRP)+systems:+a+call+for+PRP+standardization.">Review of concentration yields in commercially available platelet-rich plasma (PRP) systems: a call for PRP standardization.</a> Regional Anesthesia and Pain Medicine. 44, 652-659 (2019).</li><li>Berndt, S., Turzi, A., Pittet-Cuenod, B., Modarressi, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autologous+Platelet-Rich+Plasma+(CuteCell+PRP)+Safely+Boosts+In+Vitro+Human+Fibroblast+Expansion.">Autologous Platelet-Rich Plasma (CuteCell PRP) Safely Boosts In Vitro Human Fibroblast Expansion.</a> Tissue Engineering. Part A. 25 (21-22), 1550-1563 (2019).</li><li>Zeng, W., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Preclinical+safety+studies+on+autologous+cultured+human+skin+fibroblast+transplantation.">Preclinical safety studies on autologous cultured human skin fibroblast transplantation.</a> Cell Transplantation. 23 (1), 39-49 (2014).</li><li>Lee, E. C. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficacy+of+Autologous+Cultured+Fibroblast+Cells+as+a+Treatment+for+Patients+with+Facial+Contour+Defects:+A+Clinical+Replication+Study.">Efficacy of Autologous Cultured Fibroblast Cells as a Treatment for Patients with Facial Contour Defects: A Clinical Replication Study.</a> Journal of Cosmetics, Dermatological Sciences and Applications. 7, 306-317 (2017).</li><li>Eca, L. P., Pinto, D. G., de Pinho, A. M., Mazzetti, M. P., Odo, M. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autologous+fibroblast+culture+in+the+repair+of+aging+skin.">Autologous fibroblast culture in the repair of aging skin.</a> Dermatologic Surgery. 38 (2), 180-184 (2012).</li><li>Nilforoushzadeh, M. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autologous+fibroblast+suspension+for+the+treatment+of+refractory+diabetic+foot+ulcer.">Autologous fibroblast suspension for the treatment of refractory diabetic foot ulcer.</a> Indian Journal of Dermatology, Venereology and Leprology. 82 (1), 105-106 (2016).</li><li>Cowper, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Human+Platelet+Lysate+as+a+Functional+Substitute+for+Fetal+Bovine+Serum+in+the+Culture+of+Human+Adipose+Derived+Stromal/Stem+Cells.">Human Platelet Lysate as a Functional Substitute for Fetal Bovine Serum in the Culture of Human Adipose Derived Stromal/Stem Cells.</a> Cells. 8 (7), 724 (2019).</li><li>Atashi, F., Jaconi, M. E., Pittet-Cuenod, B., Modarressi, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autologous+platelet-rich+plasma:+a+biological+supplement+to+enhance+adipose-derived+mesenchymal+stem+cell+expansion.">Autologous platelet-rich plasma: a biological supplement to enhance adipose-derived mesenchymal stem cell expansion.</a> Tissue Engineering Part C: Methods. 21 (3), 253-262 (2015).</li><li>Martinez-Zapata, M. J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autologous+platelet-rich+plasma+for+treating+chronic+wounds.">Autologous platelet-rich plasma for treating chronic wounds.</a> The Cochrane Database of Systematic Reviews. (5), (2016).</li><li>Cervelli, V., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Use+of+platelet-rich+plasma+and+hyaluronic+acid+in+the+loss+of+substance+with+bone+exposure.">Use of platelet-rich plasma and hyaluronic acid in the loss of substance with bone exposure.</a> Advances in Skin &amp; Wound Care. 24 (4), 176-181 (2011).</li><li>Nicoli, F., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Severe+hidradenitis+suppurativa+treatment+using+platelet-rich+plasma+gel+and+Hyalomatrix.">Severe hidradenitis suppurativa treatment using platelet-rich plasma gel and Hyalomatrix.</a> International Wound Journal. 12 (3), 338-343 (2015).</li><li>Gentile, P., Bottini, D. J., Spallone, D., Curcio, B. C., Cervelli, V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Application+of+platelet-rich+plasma+in+maxillofacial+surgery:+clinical+evaluation.">Application of platelet-rich plasma in maxillofacial surgery: clinical evaluation.</a> The Journal of Craniofacial Surgery. 21 (3), 900-904 (2010).</li><li>Saleem, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Adjunctive+Platelet-Rich+Plasma+(PRP)+in+Infrabony+Regenerative+Treatment:+A+Systematic+Review+and+RCT's+Meta-Analysis.">Adjunctive Platelet-Rich Plasma (PRP) in Infrabony Regenerative Treatment: A Systematic Review and RCT's Meta-Analysis.</a> Stem Cells International. 2018, 9594235 (2018).</li><li>Everts, P. A., Pinto, P. C., Girao, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autologous+pure+platelet-rich+plasma+injections+for+facial+skin+rejuvenation:+Biometric+instrumental+evaluations+and+patient-reported+outcomes+to+support+antiaging+effects.">Autologous pure platelet-rich plasma injections for facial skin rejuvenation: Biometric instrumental evaluations and patient-reported outcomes to support antiaging effects.</a> Journal of Cosmetic Dermatology. 18 (4), 985-995 (2019).</li><li>Fiaschetti, V., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Magnetic+resonance+imaging+and+ultrasound+evaluation+after+breast+autologous+fat+grafting+combined+with+platelet-rich+plasma.">Magnetic resonance imaging and ultrasound evaluation after breast autologous fat grafting combined with platelet-rich plasma.</a> Plastic and Reconstructive Surgery. 132 (4), 498-509 (2013).</li><li>Gentile, P., Scioli, M. G., Orlandi, A., Cervelli, V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Breast+Reconstruction+with+Enhanced+Stromal+Vascular+Fraction+Fat+Grafting:+What+Is+the+Best+Method.">Breast Reconstruction with Enhanced Stromal Vascular Fraction Fat Grafting: What Is the Best Method.</a> Plastic and Reconstructive Surgery. 3 (6), 406 (2015).</li><li>Modarressi, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Platlet+Rich+Plasma+(PRP)+Improves+Fat+Grafting+Outcomes.">Platlet Rich Plasma (PRP) Improves Fat Grafting Outcomes.</a> World Journal of Plastic Surgery. 2 (1), 6-13 (2013).</li><li>Muraglia, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Culture+Medium+Supplements+Derived+from+Human+Platelet+and+Plasma:+Cell+Commitment+and+Proliferation+Support.">Culture Medium Supplements Derived from Human Platelet and Plasma: Cell Commitment and Proliferation Support.</a> Frontiers in Bioengineering and Biotechnology. 5, 66 (2017).</li><li>Ferrao, A. V., Mason, R. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+effect+of+heparin+on+cell+proliferation+and+type-I+collagen+synthesis+by+adult+human+dermal+fibroblasts.">The effect of heparin on cell proliferation and type-I collagen synthesis by adult human dermal fibroblasts.</a> Biochimica et Biophysica Acta. 1180 (3), 225-230 (1993).</li><li>Gonzalez-Delgado, P., Fernandez, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hypersensitivity+reactions+to+heparins.">Hypersensitivity reactions to heparins.</a> Current Opinion in Allergy and Clinical Immunology. 16 (4), 315-322 (2016).</li><li>Atashi, F. S. B., Nayernia, Z., Pittet-Cu&#233;nod, B., Modarressi, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Platelet+Rich+Plasma+Promotes+Proliferation+of+Adipose+Derived+Mesenchymal+Stem+Cells+via+Activation+of+AKT+and+Smad2+Signaling+Pathways.">Platelet Rich Plasma Promotes Proliferation of Adipose Derived Mesenchymal Stem Cells via Activation of AKT and Smad2 Signaling Pathways.</a> Stem Cell Research &amp; Therapy. 5 (8), (2015).</li></ol>

This project has been funded by Regen Lab SA. Sarah Berndt is the cell therapy head project manager for Regen Lab and is employed by Regen Lab SA. Antoine Turzi is the CEO of RegenLab.

The advantages of using autologous fibroblasts as a natural alternative compared to other filler materials in wound cell therapy include good biocompatibility, minimal side effects, and easiness of harvesting and use. However, before using these therapeutics in a daily clinical setting, proper preclinical studies are necessary to identify the growth features and assess the biological function and safety of isolated fibroblasts both before and after transplantation. Thus, directly after the isolation process, in vitro exp...

Regenerative medicine aims to heal or replace tissues and organs damaged by age, disease, or trauma as well as correct congenital defects. In autologous therapy, cells or tissue are withdrawn from a patient, expanded or modified, then reintroduced to the donor. This form of therapeutics has broad potential in the field of dermatology1. In autologous fibroblast therapy, a patient&#8217;s fibroblasts are cultured and reinjected to treat wrinkles, rhytids, or acne scars. As fibroblasts are the main functional cells in the dermis, injection of autologous fibroblasts may be more beneficial than other therapies in facial rejuvenation2.
In the skin, fibroblasts are responsible for the synthesis and secretion of extracellular proteins (i.e., collagen, elastin, hyaluronic acid, and glycosaminoglycans). They also release growth factors that regulate cell function, migration, and cell-matrix/cell-cell interactions in normal skin homeostasis and wound healing3. Dermal fibroblasts have already been introduced as a potential clinical cell therapy for skin wound healing4, tissue regeneration5, or dermal fillers in esthetic and plastic surgery procedures6. Some studies even suggest that, in the context of regenerative medicine, fibroblasts may be a more practical and effective cell therapy than mesenchymal stem cells7.
To obtain a sufficient number of fibroblasts for clinical applications, cell expansion is usually mandatory. Ex vivo/in vitro cell culture requires basal medium supplemented with growth factors, proteins, and enzymes to support cell adhesion and proliferation. Fetal bovine serum (FBS) is a common supplement for cell culture media, because fetal blood 1) is rich in growth factors compared to adult blood and 2) presents a low antibody content8. As cell therapy progresses, there are concerns about the safety of classical cell culture conditions in which FBS is added to the culture medium. Furthermore, there is now a tendency to replace FBS with alternatives9. Several FBS substitutes have shown promising results10.
The platelet-rich plasma (PRP) alternative has been selected here, and we have developed a medical device to produce a standardized preparation of PRP, named CuteCell-PRP. The intended use of this device is the preparation of autologous PRP to be used as a culture media supplement for in vitro expansion of autologous cells under GMP conditions.
PRP is defined as a concentrated platelet suspension in plasma. Because there are numerous preparation protocols, which differ in 1) the amount of blood needed, 2) types of devices used, and 3) centrifugation protocol, the resulting platelet concentrations vary from slightly above to more than 10x the blood baseline value. In addition, PRP preparations contain variable levels of red and white blood cell contamination. The terminology &#8220;PRP&#8221; is thus used to describe products that vary greatly in their biological composition and potential therapeutic effects.
In most studies, FBS substitution is achieved using different concentrations of PRP that is activated (by thrombin or calcium). This artificial activation provokes an immediate and important release of platelet growth factors from 15 min up to 24 h11. Therefore, it is believed that platelet activation is undesirable for applications in cell cultures, in which the slow release of growth factors from gradual platelet degranulation is required.
PRP therapy involves the preparation of autologous platelets in concentrated plasma12. The optimal platelet concentration is unclear, and a broad range of commercial devices are available to prepare PRP13. This lack of standardization results from inconsistency among studies and has led to a black box regarding the dosage and timing of injection. This protocol describes a procedure to obtain autologous PRP using this dedicated PRP device to expand skin fibroblasts in a 100% autologous ex vivo culture model.

<table>
	<tbody>
		<tr>
			<td>96 well black clear flat bottom</td>
			<td>BD Falcon</td>
			<td>353219</td>
			<td>32/case</td>
		</tr>
		<tr>
			<td>Cell trace Violet Dye</td>
			<td>Thermo Fischer Scientific</td>
			<td>C34557</td>
			<td>180 assays</td>
		</tr>
		<tr>
			<td>CuteCell PRP</td>
			<td>Regen Lab SA</td>
			<td>CC-PRP-3T</td>
			<td>3 tubes per package</td>
		</tr>
		<tr>
			<td>DAPI</td>
			<td>Sigma</td>
			<td>D9542</td>
			<td>1 mg</td>
		</tr>
		<tr>
			<td>DMEM</td>
			<td>Gibco</td>
			<td>52400-025</td>
			<td>500 mL</td>
		</tr>
		<tr>
			<td>FBS</td>
			<td>Gibco</td>
			<td>10270106</td>
			<td>500 mL</td>
		</tr>
		<tr>
			<td>Glutamine 200 mM</td>
			<td>Gibco</td>
			<td>25030024</td>
			<td>100 mL</td>
		</tr>
		<tr>
			<td>Hematology Counter</td>
			<td>Sysmex</td>
			<td>KK-21N</td>
			<td></td>
		</tr>
		<tr>
			<td>Heparin 5000E Liquemine</td>
			<td>Drossapharm AG</td>
			<td></td>
			<td>0.5 mL</td>
		</tr>
		<tr>
			<td>HEPES Buffer Solution 1M</td>
			<td>Gibco</td>
			<td>15630-056</td>
			<td>100 mL</td>
		</tr>
		<tr>
			<td>Liberase DH</td>
			<td>Roche</td>
			<td>5401054001</td>
			<td>2x 5 mg per package</td>
		</tr>
		<tr>
			<td>MEM NEAA 100x</td>
			<td>Gibco</td>
			<td>11140-035</td>
			<td>100 mL</td>
		</tr>
		<tr>
			<td>Na Pyruvate 1mg/mL</td>
			<td>Gibco</td>
			<td>11360-039</td>
			<td>100 mL</td>
		</tr>
		<tr>
			<td>Penicillin streptomycin</td>
			<td>Gibco</td>
			<td>15140122</td>
			<td>100 mL</td>
		</tr>
		<tr>
			<td>Phalloidin alexa Fluor 488</td>
			<td>Molecular Probes</td>
			<td>A12379</td>
			<td>300 units</td>
		</tr>
		<tr>
			<td>RPMI</td>
			<td>Gibco</td>
			<td>31966-021</td>
			<td>500 mL</td>
		</tr>
		<tr>
			<td>Trypsin 1x 0.25%</td>
			<td>Gibco</td>
			<td>25050-014</td>
			<td>100 mL</td>
		</tr>
		<tr>
			<td>Trypsin EDTA 0.25%</td>
			<td>Gibco</td>
			<td>25200056</td>
			<td>100 mL</td>
		</tr>
	</tbody>
</table>

production of autologous platelet-rich plasma for boosting in vitro human fibroblast expansion

There is currently great clinical interest in the use of autologous fibroblasts for skin repair. In most cases, culture of skin cells in vitro is required. However, cell culture using xenogenic or allogenic culture media has some disadvantages (i.e., risk of infectious agent transmission or slow cell expansion). Here, an autologous culture system is developed for the expansion of human skin fibroblast cells in vitro using a patient&#8217;s own platelet-rich plasma (PRP). Human dermal fibroblasts are isolated from the patient while undergoing abdominoplasty. Cultures are followed for up to 7 days using a medium supplemented with either fetal bovine serum (FBS) or PRP. Blood cell content in PRP preparations, proliferation, and fibroblast differentiation are assessed. This protocol describes the method for obtaining a standardized, non-activated preparation of PRP using a dedicated medical device. The preparation requires only a medical device (CuteCell-PRP) and centrifuge. This device is suitable under sufficient medical practice conditions and is a one-step, apyrogenic, and sterile closed system that requires a single, soft spin centrifugation of 1,500 x g for 5 min. After centrifugation, the blood components are separated, and the platelet-rich plasma is easily collected. This device allows a quick, consistent, and standardized preparation of PRP that can be used as a cell culture supplement for in vitro expansion of human cells. The PRP obtained here contains a 1.5-fold platelet concentration compared to whole blood together, with a preferential removal of red and white blood cells. It is shown that PRP presents a boosting effect in cell proliferation compared to FBS (7.7x) and that fibroblasts are activated upon PRP treatment.

This patented technology is a simple, fast, and reproducible medical device used to produce standardized PRP preparations. It is a one-step, fully closed system that allows the preparation of PRP from venous whole blood after 5 min of centrifugation at 1,500 x g (due to the separating gel technology). The PRP obtained after centrifugation is cleared from red and white blood cells, which sit below the gel. After several tube inversions, the platelets that are on top of the gel are resuspended in the plasma, and t...

Watch this Scientific Journal Video about Production of Autologous Platelet-Rich Plasma for Boosting In Vitro Human Fibroblast Expansion at JoVE.com

Production of Autologous Platelet-Rich Plasma for Boosting In Vitro Human Fibroblast Expansion

This protocol presents a device that produces PRP to boost the in vitro expansion of cells in a 100% autologous fibroblast culture system.

There is currently great clinical interest in the use of autologous fibroblasts for skin repair. In most cases, culture of skin cells in vitro is ...

This protocol is the autologous system for human fibroblast culture with the patient's own platelet-rich plasma and a standardized preparation for five minutes. PRP promotes a massive cell expansion of fibroblast in culture. I would recommend you to use this method using PRP as a cell supplement when you need massive creek and safe cell expansion for autologous cell therapies.When you attempt this protocol, I would recommend you to check the PRP integrity. Your plasma has to be very clean with absence of red blood cells. When you transfer it, you have to do it very carefully.And concerning the digestion of your tissue, it has to be very clean before proceeding. To begin, carefully turn the blood-filled platelet-rich plasma, or PRP, tubes upside down three times to mix the blood with anticoagulant. Centrifuge the blood samples at 1500g for five minutes in a fixed 45-degree-angled rotor and balance the tubes.After centrifugation, the fractionated blood has red and white blood cells trapped under the separating gel and platelets on the surface of the gel. Gently invert the PRP tube 20 times to resuspend the platelet deposit in the plasma supernatant. Ensure that the platelets are fully detached from the gel and the plasma should change from clear and transparent to turbid.Collect the plasma solution from the tube using a transfer device connected to a 10-milliliter syringe. Place the skin samples in a 50-milliliter polypropylene tube with PBS and shake the tube gently. If the skin sample is relatively large, place it on the lid of a 150-square-centimeter tissue culture dish with the epidermal side down.Remove the subcutaneous fat tissue using a pair of forceps and scissors. To prevent the tissue from drying out, rinse the tissue every few minutes in PBS. When fat removal is complete, use a scalpel to cut the skin samples into strips, approximately 0.5 by 1.5 centimeters.Next, add five milliliters of Collagenase/Dispase mix to a sterile 15-milliliter tube. Transfer the cut tissue to the tube. Ensure that the tissue pieces are submerged in the solution and cap the tube securely.Place the tubes in an incubator at 37 degrees Celsius with orbital shaking for 150 minutes. After incubation, move the tube containing the tissue to the biosafety cabinet. Place the lid of a sterile 100-millimeter culture dish upside down in the biosafety cabinet.Transfer the tissue suspension to the bottom of the 100-millimeter culture dish without splashing. If any pieces of tissue remain in the tube, use a sterile one-milliliter pipette or sterile forceps to transfer the pieces to the bottom of the culture dish. With the epidermis facing up, hold the dermis with a pair of forceps.Grasp the edge of the epidermis with another pair of forceps and peel the dermis and epidermis apart. Keeping the separated pieces on the same lid, place the dermal pieces in a new 100-millimeter culture dish containing PBS. Next, using laboratory forceps, transfer the dermal pieces to a 15-milliliter polypropylene tube containing three milliliters of 0.3%Trypsin PBS.Incubate the tube in a 37-degree-Celsius water bath and mix the contents every two to three minutes by inverting the tube several times. After 10 to 20 minutes, stop the reaction by adding three to five milliliters of ice-cold complete growth medium. Vortex the tube vigorously several times.Filter the suspension, which contains the fibroblasts, through an 85-micron nylon mesh into a 50-milliliter tube. Centrifuge the fibroblast solution at 150g for 10 minutes. Aspirate the supernatant and resuspend the cell pellet in 100 to 200 microliters of complete growth medium for cell count.Plate the cells in a 25-square-centimeter tissue culture flask. Then, incubate the flask at 37 degrees Celsius. Change the medium which contains non-adherent cells on the following day, and again, every three to four days.When the fibroblasts reach 70 to 80%confluency, wash them with PBS and add Trypsin-EDTA solution. After incubating the flask for three minutes at 37 degrees Celsius, stop the reaction by adding three to five milliliters of warm complete growth medium. Then, centrifuge the cell suspension at 200g for five minutes.Remove the supernatant by aspiration. Culture the fibroblasts in PRP medium and incubate at 37 degrees Celsius. The minimum cell density recommended is 4, 000 viable cells per centimeter squared.A dedicated medical device was used to produce PRP by processing whole blood from 10 different patients. The device removed the majority of the red blood cells and white blood cells. The mean platelet concentration in the PRP was approximately 50%higher than the platelet concentration in whole blood.Autologous fibroblasts were cultivated in medium with 10%FBS or in media with PRP concentrations ranging from one to 50%After seven days of culture, without changing the medium, the cultures primed with 20%PRP exhibited a higher number of viable fibroblasts. PRP had potent effects as a proliferation booster up to 7.7 fold compared to FBS. Phalloidin staining showed that the morphological change observed upon PRP activation was related to F-actin reorganization, which is a signature of fibroblast activation.A major concern of rapid cell expansion is the risk of genomic modification. In order to assess this, you can perform comparative genomic hybridization assay to assess the genomic stability of your cells. The main advantage of this technique is to replace FBS by a PRP, which is a more potent autologous biological supplement.With this, researcher can grow more cell faster without any addition of a xenogeneic substances. We may use this technique for other cell types that need ex vivo expansion before clinical application, for example, keratinocyte or mesenchymal stem cell.

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2.3K Views.  Geneva University. This protocol is the autologous system for human fibroblast culture with the patient's own platelet-rich plasma and a standardized preparation for five minutes. PRP promotes a massive cell expansion of fibroblast in culture. I would recommend you to use this method using PRP as a cell supplement when you need massive creek and safe cell expansion for autologous cell therapies.When you attempt this protocol, I would recommend you to check the PRP integrity. Your plasma has to be very cl...