The authors have no acknowledgments.

hASCs were isolated from the abdominal adipose tissue of a healthy woman who underwent breast reconstruction using abdominal autologous flaps (deep inferior epigastric perforator flaps, [DIEP]) at the University Hospital of Lausanne, CHUV, Lausanne, Switzerland. The discarded part of the flap and the adipose tissue was obtained after the patient signed informed consent. All protocols were reviewed and approved by the hospital&#39;s Biobank Department DAL (number 314 GGC) and ethics committees in accordance with the Decla...

<ol>
	<li>Naderi, N., 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+regenerative+role+of+adipose-derived+stem+cells+(ADSC)+in+plastic+and+reconstructive+surgery.">The regenerative role of adipose-derived stem cells (ADSC) in plastic and reconstructive surgery.</a> International Wound Journal. 14 (1), 112-124 (2017).</li><li>Guiotto, M., Riehle, M. O., Raffoul, W., Hart, A., di Summa, P. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Is+human+platelet+lysate+(hPL)+the+ideal+candidate+to+substitute+the+foetal+bovine+serum+for+cell-therapy+translational+research.">Is human platelet lysate (hPL) the ideal candidate to substitute the foetal bovine serum for cell-therapy translational research.</a> Journal of Translational Medicine. 19 (1), 426 (2021).</li><li>Cond&#233;-Green, 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=Shift+toward+mechanical+isolation+of+adipose-derived+stromal+vascular+fraction:+Review+of+upcoming+techniques.">Shift toward mechanical isolation of adipose-derived stromal vascular fraction: Review of upcoming techniques.</a> Plastic and Reconstructive Surgery. Global Open. 4 (9), 1017 (2016).</li><li>Zuk, P. 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=Multilineage+cells+from+human+adipose+tissue:+Implications+for+cell-based+therapies.">Multilineage cells from human adipose tissue: Implications for cell-based therapies.</a> Tissue Engineering. 7 (2), 211-228 (2001).</li><li>Chang, H., 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=Safety+of+adipose-derived+stem+cells+and+collagenase+in+fat+tissue+preparation.">Safety of adipose-derived stem cells and collagenase in fat tissue preparation.</a> Aesthetic Plastic Surgery. 37 (4), 802-808 (2013).</li><li>Spees, J. L., 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=Internalized+antigens+must+be+removed+to+prepare+hypoimmunogenic+mesenchymal+stem+cells+for+cell+and+gene+therapy.">Internalized antigens must be removed to prepare hypoimmunogenic mesenchymal stem cells for cell and gene therapy.</a> Molecular Therapy. 9 (5), 747-756 (2004).</li><li>Fadel, L., 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=Protocols+for+obtainment+and+isolation+of+two+mesenchymal+stem+cell+sources+in+sheep.">Protocols for obtainment and isolation of two mesenchymal stem cell sources in sheep.</a> Acta Cirurgica Brasileria. 26 (4), 267-273 (2011).</li><li>Markarian, C. 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=Isolation+of+adipose-derived+stem+cells:+A+comparison+among+different+methods.">Isolation of adipose-derived stem cells: A comparison among different methods.</a> Biotechnology Letters. 36 (4), 693-702 (2014).</li><li>Sherman, L. S., Cond&#233;-Green, A., Naaldijk, Y., Lee, E. S., Rameshwar, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+enzyme-free+method+for+isolation+and+expansion+of+human+adipose-derived+mesenchymal+stem+cells.">An enzyme-free method for isolation and expansion of human adipose-derived mesenchymal stem cells.</a> Journal of Visualized Experiments. (154), e59419 (2019).</li><li>Lalu, M. 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=Safety+of+cell+therapy+with+mesenchymal+stromal+cells+(SafeCell):+A+systematic+review+and+meta-analysis+of+clinical+trials.">Safety of cell therapy with mesenchymal stromal cells (SafeCell): A systematic review and meta-analysis of clinical trials.</a> PLoS One. 7 (10), 47559 (2012).</li><li>Escobar, C. H., Chaparro, O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Xeno-free+extraction,+culture,+and+cryopreservation+of+human+adipose-derived+mesenchymal+stem+cells.">Xeno-free extraction, culture, and cryopreservation of human adipose-derived mesenchymal stem cells.</a> Stem Cells Translational Medicine. 5 (3), 358-365 (2016).</li><li>Vaidya, 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=Ultraviolet-C+irradiation+for+inactivation+of+viruses+in+foetal+bovine+serum.">Ultraviolet-C irradiation for inactivation of viruses in foetal bovine serum.</a> Vaccine. 36 (29), 4215-4221 (2018).</li><li>Kyll&#246;nen, L., 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=Effects+of+different+serum+conditions+on+osteogenic+differentiation+of+human+adipose+stem+cells+in+vitro.">Effects of different serum conditions on osteogenic differentiation of human adipose stem cells in vitro.</a> Stem Cell Research &amp; Therapy. 4 (1), 17 (2013).</li><li>Schallmoser, K., Henschler, R., Gabriel, C., Koh, M. B. C., Burnouf, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Production+and+quality+requirements+of+human+platelet+lysate:+A+position+statement+from+the+Working+Party+on+Cellular+Therapies+of+the+International+Society+of+Blood+Transfusion.">Production and quality requirements of human platelet lysate: A position statement from the Working Party on Cellular Therapies of the International Society of Blood Transfusion.</a> Trends in Biotechnology. 38 (1), 13-23 (2020).</li><li>Guiotto, M., Raffoul, W., Hart, A. M., Riehle, M. O., di Summa, P. G. <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+to+substitute+fetal+bovine+serum+in+hMSC+expansion+for+translational+applications:+A+systematic+review.">Human platelet lysate to substitute fetal bovine serum in hMSC expansion for translational applications: A systematic review.</a> Journal of Translational Medicine. 18 (1), 351 (2020).</li><li>Guiotto, M., Raffoul, W., Hart, A. M., Riehle, M. O., di Summa, P. G. <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+acts+synergistically+with+laminin+to+improve+the+neurotrophic+effect+of+human+adipose-derived+stem+cells+on+primary+neurons.">Human platelet lysate acts synergistically with laminin to improve the neurotrophic effect of human adipose-derived stem cells on primary neurons.</a> Frontiers in Bioengineering and Biotechnology. 9, 658176 (2021).</li><li>Dominici, 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=Minimal+criteria+for+defining+multipotent+mesenchymal+stromal+cells.+The+International+Society+for+Cellular+Therapy+position+statement.">Minimal criteria for defining multipotent mesenchymal stromal cells. The International Society for Cellular Therapy position statement.</a> Cytotherapy. 8 (4), 315-317 (2006).</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>Kim, N., 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=Mesenchymal+stem+cells+for+the+treatment+and+prevention+of+graft-versus-host+disease:+Experiments+and+practice.">Mesenchymal stem cells for the treatment and prevention of graft-versus-host disease: Experiments and practice.</a> Annals of Hematology. 92 (10), 1295-1308 (2013).</li><li>Palombella, S., 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=Effects+of+metal+micro+and+nano-particles+on+hASCs:+An+in+vitro+model.">Effects of metal micro and nano-particles on hASCs: An in vitro model.</a> Nanomaterials. 7 (8), 212 (2017).</li><li>Han, S., Sun, H. M., Hwang, K. C., Kim, S. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Adipose-derived+stromal+vascular+fraction+cells:+Update+on+clinical+utility+and+efficacy.">Adipose-derived stromal vascular fraction cells: Update on clinical utility and efficacy.</a> Critical Reviews in Eukaryotic Gene Expression. 25 (2), 145-152 (2015).</li><li>Sotiropoulou, P. A., Perez, S. A., Salagianni, M., Baxevanis, C. N., Papamichail, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cell+culture+medium+composition+and+translational+adult+bone+marrow-derived+stem+cell+research.">Cell culture medium composition and translational adult bone marrow-derived stem cell research.</a> Stem Cells. 24 (5), 1409-1410 (2006).</li><li>Perez-Ilzarbe, 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=Comparison+of+ex+vivo+expansion+culture+conditions+of+mesenchymal+stem+cells+for+human+cell+therapy.">Comparison of ex vivo expansion culture conditions of mesenchymal stem cells for human cell therapy.</a> Transfusion. 49 (9), 1901-1910 (2009).</li><li>Tsuji, K., 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=Effects+of+different+cell-detaching+methods+on+the+viability+and+cell+surface+antigen+expression+of+synovial+mesenchymal+stem+cells.">Effects of different cell-detaching methods on the viability and cell surface antigen expression of synovial mesenchymal stem cells.</a> Cell Transplantation. 26 (6), 1089-1102 (2017).</li><li>Shah, F. S., Wu, X., Dietrich, M., Rood, J., Gimble, J. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+non-enzymatic+method+for+isolating+human+adipose+tissue-derived+stromal+stem+cells.">A non-enzymatic method for isolating human adipose tissue-derived stromal stem cells.</a> Cytotherapy. 15 (8), 979-985 (2013).</li><li>Becherucci, 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=Human+platelet+lysate+in+mesenchymal+stromal+cell+expansion+according+to+a+GMP+grade+protocol:+A+cell+factory+experience.">Human platelet lysate in mesenchymal stromal cell expansion according to a GMP grade protocol: A cell factory experience.</a> Stem Cell Research &amp; Therapy. 9 (1), 124 (2018).</li><li>Blande, I. S., 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=Adipose+tissue+mesenchymal+stem+cell+expansion+in+animal+serum-free+medium+supplemented+with+autologous+human+platelet+lysate.">Adipose tissue mesenchymal stem cell expansion in animal serum-free medium supplemented with autologous human platelet lysate.</a> Transfusion. 49 (12), 2680-2685 (2009).</li><li>Castegnaro, S., 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=Effect+of+platelet+lysate+on+the+functional+and+molecular+characteristics+of+mesenchymal+stem+cells+isolated+from+adipose+tissue.">Effect of platelet lysate on the functional and molecular characteristics of mesenchymal stem cells isolated from adipose tissue.</a> Current Stem Cell Research &amp; Therapy. 6 (2), 105-114 (2011).</li><li>Palombella, S., 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=Systematic+review+and+meta-analysis+on+the+use+of+human+platelet+lysate+for+mesenchymal+stem+cell+cultures:+Comparison+with+fetal+bovine+serum+and+considerations+on+the+production+protocol.">Systematic review and meta-analysis on the use of human platelet lysate for mesenchymal stem cell cultures: Comparison with fetal bovine serum and considerations on the production protocol.</a> Stem Cell Research &amp; Therapy. 13 (1), 142 (2022).</li><li>Palombella, S., 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+potential+clinical-translatable+supplement+to+support+the+neurotrophic+properties+of+human+adipose-derived+stem+cells.">Human platelet lysate as a potential clinical-translatable supplement to support the neurotrophic properties of human adipose-derived stem cells.</a> Stem Cell Research &amp; Therapy. 11 (1), 432 (2020).</li><li>Kr&#228;henb&#252;hl, S. M., Grognuz, A., Michetti, M., Raffoul, W., Applegate, L. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Enhancement+of+human+adipose-derived+stem+cell+expansion+and+stability+for+clinical+use.">Enhancement of human adipose-derived stem cell expansion and stability for clinical use.</a> International Journal of Stem Cell Research &amp; Therapy. 2 (1), 007 (2015).</li></ol>

Adipose-derived stem cells have attracted the interest of translational research in the last decade due to their abundance, quick and affordable isolation methods, high in vitro/in vivo proliferation rate, and stemness/differentiation properties18,19,20. As a result, hASCs are considered an excellent candidate for cell-based strategies in regenerative medicine21. After isolation from adi...

In the last decades, the increasing demand for innovative therapeutic treatments has given rise to significant efforts and resource investment in the translational medicine field1. Cell-based products are associated with risks determined by the cell source, the manufacturing process (isolation, expansion, or genetic modification), and the non-cellular supplements (enzymes, growth factors, culture supplements, and antibiotics), and these risk factors depend on the specific therapeutic indication. The quality, safety, and efficacy of the final product could be deeply influenced by the above-indicated elements2. Stem cell therapy requires adherence to biosafety principles; the potential risks of pathogenic transmission with animal-derived products in cell culture could be problematic, and the thorough testing of any product introduced in the manufacturing is essential3.
The traditional method to isolate human adipose-derived stem cells (hASCs) involves an enzymatic digestion performed with collagenase followed by washing steps through centrifugation4. While enzymatic isolation is generally considered more efficient than other mechanical techniques in terms of cell yields and viability, the animal-derived components used, such as collagenase, are considered more than minimally manipulated by the U.S. Food and Drug Administration. This means there is a significantly increased risk of immune reactions or disease transmission, thus limiting the translation of hASC therapy to clinical settings5,6.
Trypsin-based digestion is another enzymatic protocol to isolate ASCs. Different techniques have been described with slight modifications in terms of the trypsin concentration, centrifugation speed, and incubation time. Unfortunately, this method is not well described, and a lack of comparison exists in the literature, particularly with the mechanical isolation protocols7. However, in terms of the translatability of the approach, trypsin has the same drawbacks of collagenase.
Alternative isolation methods to obtain ASCs, based on mechanical forces and without enzyme addition, involve high-speed centrifugation (800 x g or 1,280 x g, 15 min) of the adipose tissue fragments. Then, the pellet is incubated with a red blood cell lysis buffer (5 min), followed by another centrifugation step at 600 x g before resuspension in culture medium. Despite a greater number of cells being isolated in the first days compared to the explant methods, a previous study showed lower or absent proliferation beyond the second week of culture8.
Besides that, further manipulation with xenogeneic added medium, such as fetal bovine serum (FBS), which is used as a growth factor supplement for cell culture, is associated with an increased risk of immune reactivity and exposure to viral, bacterial, or prion infections of the host patient9,10. Immune reactions and urticariform rash development have been already described in individuals receiving several doses of mesenchymal stem cells produced with FBS11. Furthermore, FBS is subjected to batch-to-batch variability, which can have an impact on the final product quality12.
In accordance with good manufacturing practice (GMP) guidelines, enzymatic tissue dissociation should be avoided, and FBS should be substituted with xenogeneic-free supplements. These steps, together with more reliable and reproducible protocols, are essential to support the application of cell therapy3,13.
In this context, human platelet lysate (hPL) has been suggested as a substitute for FBS since it is a cell-free, protein-containing, growth factor-enriched supplement, and it was earlier introduced among clinical-grade cell-based products as an additive of growth medium for in vitro cell culture and expansion14,15. As hPL is a human-derived product, it is frequently used as a substitute for FBS during the in vitro culture of hASCs intended for clinical applications, thus reducing issues regarding immunological reactions and infections related to FBS translatability15,16.
Despite the higher production costs, it has already been demonstrated that compared to FBS, hPL supports cell viability for many cell types, increases proliferation, delays senescence, assures genomic stability, and conserves the cellular immunophenotype even in late cell passages; all these elements support the switching toward this culture supplement11.
The aim of this work was to develop a standardized protocol to isolate and culture hASCs with a complete animal-free method, without modifying the cell physiology and stemness properties in comparison to classical FBS-cultured hASCs (Figure 1).

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>15 mL tubes</td>
			<td>euroclone</td>
			<td>et5015b</td>
			<td></td>
		</tr>
		<tr>
			<td>anti-CD105</td>
			<td>BD Biosciences</td>
			<td>BD560839</td>
			<td></td>
		</tr>
		<tr>
			<td>anti-CD34</td>
			<td>BD Biosciences</td>
			<td>BD555821</td>
			<td></td>
		</tr>
		<tr>
			<td>anti-CD45</td>
			<td>BD Biosciences</td>
			<td>BD555482</td>
			<td></td>
		</tr>
		<tr>
			<td>anti-CD73</td>
			<td>BD Biosciences</td>
			<td>BD561254</td>
			<td></td>
		</tr>
		<tr>
			<td>autoMACS Rinsing Solution (FACS buffer)</td>
			<td>Miltenyi</td>
			<td>130-091-222</td>
			<td></td>
		</tr>
		<tr>
			<td>BD Accuri C6 apparatus (flow cytometry instrument)</td>
			<td>BD accuri</td>
			<td>-</td>
			<td></td>
		</tr>
		<tr>
			<td>Burker chamber</td>
			<td>Blaubrand</td>
			<td>717810</td>
			<td></td>
		</tr>
		<tr>
			<td>Cell freezing container</td>
			<td>corning</td>
			<td>CLS432002</td>
			<td></td>
		</tr>
		<tr>
			<td>CellTiter 96 AQueous One Solution Cell Proliferation Assay</td>
			<td>Promega</td>
			<td>G3582</td>
			<td></td>
		</tr>
		<tr>
			<td>CoolCell Freezing container</td>
			<td>Corning</td>
			<td>CLS432002</td>
			<td></td>
		</tr>
		<tr>
			<td>Cryovials</td>
			<td>clearline</td>
			<td>390701</td>
			<td></td>
		</tr>
		<tr>
			<td>Dimethyl sulfide</td>
			<td>Sigma Aldrich</td>
			<td>D2650-100mL</td>
			<td></td>
		</tr>
		<tr>
			<td>disposabile blade scalpel</td>
			<td>paragon</td>
			<td>bs 2982</td>
			<td></td>
		</tr>
		<tr>
			<td>Dulbecco&#39;s Modified Eagle&#39;s Medium - high glucose</td>
			<td>GIBCO</td>
			<td>11965092</td>
			<td></td>
		</tr>
		<tr>
			<td>Human Platelet Lysate FD (GMP grade)</td>
			<td>Stemulate</td>
			<td>PL-NH-500</td>
			<td></td>
		</tr>
		<tr>
			<td>Infinite F50 spectrophotometer</td>
			<td>Tecan</td>
			<td>-</td>
			<td></td>
		</tr>
		<tr>
			<td>Optical microscope with 4x and 10x magnification objectives</td>
			<td>Olympus</td>
			<td>CKX41</td>
			<td></td>
		</tr>
		<tr>
			<td>Petri dish 10 cm</td>
			<td>Greiner bio-one</td>
			<td>664160</td>
			<td></td>
		</tr>
		<tr>
			<td>Sterile scalpels</td>
			<td>Reda</td>
			<td>07104-00</td>
			<td></td>
		</tr>
		<tr>
			<td>Sterile scissors</td>
			<td>Bochem</td>
			<td>4071</td>
			<td></td>
		</tr>
		<tr>
			<td>Sterile tweezers</td>
			<td>Bochem</td>
			<td>1152</td>
			<td></td>
		</tr>
		<tr>
			<td>Swinging bucket centrifuge</td>
			<td>Sigma</td>
			<td>3-16K</td>
			<td></td>
		</tr>
		<tr>
			<td>T25 flasks</td>
			<td>Greiner bio-one</td>
			<td>6910170</td>
			<td></td>
		</tr>
		<tr>
			<td>TrypLe (animal free trypsin substitute)</td>
			<td>GIBCO</td>
			<td>12604-013</td>
			<td></td>
		</tr>
	</tbody>
</table>

isolation and culture of human adipose-derived stem cells with an innovative xenogeneic-free method for human therapy

Considering the increasing impact of stem cell therapy, biosafety concerns have been raised regarding potential contamination or infection transmission due to the introduction of animal-derived products during in vitro manipulation. The xenogeneic components, such as collagenase or fetal bovine serum, commonly used during the cell isolation and expansion steps could be associated with the potential risks of immune reactivity or viral, bacterial, and prion infection in the receiving patients. Following good manufacturing practice guidelines, chemical tissue dissociation should be avoided, while fetal bovine serum (FBS) can be substituted with xenogeneic-free supplements. Moreover, to ensure the safety of cell products, the definition of more reliable and reproducible methods is important. We have developed an innovative, completely xenogeneic-free method for the isolation and in vitro expansion of human adipose-derived stem cells without altering their properties compared to collagenase FBS-cultured standard protocols. Here, human adipose-derived stem cells (hASCs) were isolated from abdominal adipose tissue. The sample was mechanically minced with scissors/a scalpel, micro-dissected and mechanically dispersed in a 10 cm Petri dish, and prepared with scalpel incisions to facilitate the attachment of the tissue fragments and the migration of hASCs. Following the washing steps, hASCs were selected due to their plastic adherence without enzymatic digestion. The isolated hASCs were cultured with medium supplemented with 5% heparin-free human platelet lysate and detached with an animal-free trypsin substitute. Following good manufacturing practice (GMP) directions on the production of cell products intended for human therapy, no antibiotics were used in any culture media.

Applying the isolation method detailed above, hASCs were successfully obtained from abdominal adipose tissue samples without the use of collagenase. Moreover, the hASCs were expanded in complete xenogeneic-free conditions in the presence of hPL and without any other components of animal origin. The following results support the protocol and are obtained from hASCs cultured in parallel with hPL and with FBS as the control condition.
After the initial cluster appearance, the hASCs showed the cla...

Watch this Scientific Journal Video about Isolation and Culture of Human Adipose-Derived Stem Cells With an Innovative Xenogeneic-Free Method for Human Therapy at JoVE.com

Isolation and Culture of Human Adipose-Derived Stem Cells With an Innovative Xenogeneic-Free Method for Human Therapy

Xenogeneic (chemical or animal-derived) products introduced in the cell therapy preparation/manipulation steps are associated with an increased risk of immune reactivity and pathogenic transmission in host patients. Here, a complete xenogeneic-free method for the isolation and in vitro expansion of human adipose-derived stem cells is described.

Considering the increasing impact of stem cell therapy, biosafety concerns have been raised regarding potential contamination or infection transmission ...

Our exogenic-free method for isolation and in vitro expansion of human adipose-derived stem cells is the answer to the biosafety concerns around cell therapy when it's considered for translational application. Our isolation and expansion methods are simple to replicate, quick, and low in technical requirements, making them useful to everyone. We investigate human adipose stem cells-based therapy strategy for peripheral nerve repair.However, our technique can be widely applied when new adipose stem cells are needed in different clinical research setups. We kept it simple to conserve easier producibility. Sterility should be carefully observed from operating room until cell culture.For sample manipulation and fragments, micro dissection are at a risk of contamination. After obtaining the adipose tissue sample from abdominal plastic surgery, using sterile scissors, cut it into pieces of approximately one square centimeter. With a scalpel, micro dissect each piece into smaller fragments and disperse five fragments in a 10 centimeter Petri dish.For fragment attachment, use a scalpel to create incisions on the plastic surface and drag each fragment. Gently, add 10 milliliters of complete culture medium to cover all the fragments without detaching them and incubate the Petri dish at 37 degrees Celsius and 5%carbon dioxide. Monitor the human adipose-derived stem cell, or HASC, expansion daily under an optical microscope until cells become confluent.Replace the medium with a fresh complete medium every 72 hours to remove cell debris and let them grow until the first passage. Once the HASC culture reaches 70 to 80%confluency, remove and discard all the pieces of tissue using sterile tweezers. Also, discard the exhausted medium avoiding the HASC's detachment from the Petri dish.Carefully wash the cells with 10 milliliters of PBS. After removing PBS, add one milliliter of animal-free trypsin and incubate at 37 degrees Celsius for five minutes. Check for cell detachment under an optical microscope and incubate for two more minutes, if required.To support the cell detachment, gently tap the plastic surface. Stop the trypsin action by adding two milliliters of complete medium and collect all the cells in a 15 milliliter tube. Remove the remaining trypsin by centrifugation.After discarding the supernatant, suspend the cells in five milliliters complete medium and transfer the cell suspension to a new T25 flask. For cryo preservation, count an aliquot of detach detached cells using the cell counter under an optical microscope. Centrifuge the cells at 300 G for five minutes.After discarding the supernatant, suspend the cells in the freezing mix at a density of one times 10 to the sixth cells per milliliter and transfer one milliliter of the cell suspension into one cryo vial. Put the cryo vials at minus 80 degrees Celsius in a freezing container that decreases the temperature by one degree Celsius per minute and then move the cryo vials to liquid nitrogen for long-term storage. In the initial cluster appearance, the HASCs showed a classical spindle-like shape and were smaller, as well as more elongated compared to the control cells in the presence of FBS.The cell immunophenotype appeared to be similar between the HASCs cultured with the two supplements. More than 80 to 90%of the HASCs were positive for CD73 and CD105 and less than 5%expressed for CD34 and CD45. Finally, the proliferation assay revealed a significant increase in cell growth when human platelet lysate was added to the medium compared to the FBS control.The most important step is the micro dissection of adipose fragments and their attachment with scalpel incision on Petri dish. A ready to use human adipose-derived stem cell population is obtained in respect to the GMP biosafety criteria, keeping therapeutic cell properties and enhancing cell proliferation.

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JoVE Journal

Medicine

2.7K vistas.  Centre Hospitalier Universitaire Vaudois (CHUV. Nuestro método libre de exógenos para el aislamiento y la expansión in vitro de células madre derivadas de tejido adiposo humano es la respuesta a las preocupaciones de bioseguridad en torno a la terapia celular cuando se considera para su aplicación traslacional. Nuestros métodos de aislamiento y expansión son fáciles de replicar, rápidos y bajos en requisitos técnicos, lo que los hace útiles para todos. Investigamos la estrategia de terapia basada en células madre adiposas human...