This study was supported by Natural Sciences and Engineering Research Council of Canada Discovery Grant (371697-2011, AT). The authors want to acknowledge the help of bariatric surgeons Drs S. Biron, F-S. Hould, S. Lebel, O. Lescelleur, P. Marceau as well as Christine Racine and Caroline Gagnon from the IUCPQ Tissue Bank. We thank Mr Jacques Cadorette from the IUCPQ&#8217;s audiovisual services for video shooting and editing.

Ethics Statement: Das Projekt wurde von Forschungsethikkommission IUCPQ die vor der Rekrutierung von Patienten zugelassen. Für die Zwecke dieses Artikels / Video, erhalten wir Gewebe von 2 Patienten: 1) ein 62 Jahre alten männlichen Patienten mit einem BMI von 50,7 kg / m 2 und 2) eine 35-jährige Patientin mit einem BMI von 57 kg / m 2. Experimente können mit beiden Fettkompartimente geführt werden, sondern müssen eine Fettkammer für die Zwecke dieser Video beschränkt. Technische Aspekte der Video wurden mit Patienten-1 durchgeführt, und FABP4 Immunofluoreszenz wurde mit undifferenzierten Zellen von Patienten 2 durchgeführt. 1. Probenbearbeitung <ol><li> Frag Chirurgen Fettgewebe aus den omentalis und subkutane Fett Fächer bei der laparoskopischen Adipositaschirurgie zu sammeln. </li><li> Bringen schnell adipose Proben an das Labor bei RT und sofort verarbeitet. </li><li> Führen Verdauung im Labor, in einer nicht sterilen Atmosphäre. DieZellen werden schließlich zu dem Kulturraum überführt und unter sterilen Bedingungen kultiviert werden. Um Verunreinigungen zu vermeiden, bereiten KRH-Puffer mit destilliertem Wasser und filtriert, und folgen Sie durch eine Filtration (0,22 um Filter) vor dem Aufschluss. Gründlich reinigen Rohre mit Ethanol vor Transfer in die Zellkultur Haube für Kolben und Plattenherstellung. </li><li> Zeigen Fettgewebe auf einem bereits gewichtet Gericht und Rekordgewicht. Fix ein kleines Stück von jeder Gewebeprobe (weniger als 1 cm 2) in 10% Formalin-Puffer bei Raumtemperatur mindestens 24 Stunden vor der Paraffineinbettung. Verwenden Sie diese eingebetteten Probe für die Immunhistochemie Experimente (Technik nicht gezeigt). </li><li> Stellen Sie ein weiteres Stück in einem 50-ml-Tube und Flash-freeze in flüssigem Stickstoff vor der Lagerung bei -80 ° C für weitere Studien auf ganzen Fettgewebe (zB Genexpression - Technik nicht gezeigt). </li></ol> 2. Kollagenaseverdau <ol><li> Legen Sie die übrigen Fettgewebe Stück in einem 50 ml-tuist für die Verdauung. </li><li> 4 ml KRH-WB mit Collagenase (350 U / ml) ergänzt pro Gramm Probe in dem Aufschlußbehälter. </li><li> Hackfleisch Fettgewebe mit einer Schere. </li><li> Platzieren Hackfleisch Fettgewebe Suspension in einem Schüttler bei 37 ° C, 90 Upm maximale, für eine 45-minütige Inkubation (für 1 h). </li></ol> 3. Reinigung von Adipozyten und Präadipozyten <ol><li> Gießen Sie das durchscheinende Lösung mit wenigen Stücke von Fett durch ein 400 &amp; mgr; M Nylon Netz in einen Kunststoffbecher. </li><li> Mit Pinzette, reiben Sie die Zellpräparation auf der Nylon-Mesh und wäscht mit 5 ml KRH-WB. </li><li> Die filtrierte Zellsuspension in ein 50 ml Röhrchen mit dem Kunststoffschlauch in ihm und einer 60 cm³-Spritze am Rohrglied befestigbar zart zu übertragen. </li><li> Lassen Sie die Suspension mit reifen Fettzellen stehen für etwa 10 Minuten, so dass die Zellen an die Spitze des Puffers durch Flotation zu erreichen. </li><li> Langsam absaugen Puffer am Boden des Röhrchens mit 60cc syringe Absaugung. </li><li> 20 ml KRH-WB zu waschen. Wiederholen Sie ab Schritt 3.4 für 2 zusätzliche Wäschen. </li><li> Sammeln Sie den Puffer, um die Adipozyten Suspension bis zu einem Endvolumen von 5 bzw. 10 ml zu bringen, abhängig von der Zellmenge. Verfolgen Sie mit den Schritten in Abschnitt 5. </li><li> Wiederherstellen des Stroma-Kreisfraktion aus der mit dem 60 cm³-Spritze durch Zentrifugation (3000 rpm, RT, 5 min) zur weiteren primären Zellkultur gesammelt falls Puffer (Technik nicht gezeigt). </li></ol> 4. Mature Adipocyte Zellzahl <ol><li> Last 10 ul sanft geschüttelt Adipozyten-Suspension in einer Zählkammer (Hämozytometer). Führen Zellzahl in vierfacher Ausfertigung. </li><li> Berechnung der Anzahl der isolierten reifen Zellen. </li></ol> 5. Mature Adipocyte Dedifferenzierung in T-25-Kolben <ol><li> Ein 25 cm 2 Zellkulturflasche auf das Volumen mit DMEM / F12-20% Kälberserum ¾ füllen. </li><li> Nach Zellzahl, gießen 500.000 reifen Zellen in den Kolben. </li&gt; <li> Der Kolben wird komplett mit einem 50 ml Röhrchen mit Medium Füllen Sie und entfernen Sie so viele Blasen wie möglich. </li><li> Schrauben Sie den unbelüfteten Kappe auf den Kolben. </li><li> Der Kolben wird mit Ethanol vor der Inkubation zur Vermeidung von Verunreinigungen zu säubern. </li><li> Die Flasche auf den Kopf für eine Woche Inkubation ohne es zu berühren, um eine Bewegung in der Kultur, die Zelladhärenzfaktor stören könnten. </li><li> Vor der Umkehr des Kolbens bei 7 Tagen nach der umgekehrten Kultur vorsichtig die Flasche zu manipulieren und entfernen Sie alle Medium im Kolben durch Aspiration, die Vermeidung abrupter Bewegungen. </li><li> Fügen Sie 12 ml DMEM-F12-20% Kälberserum und pflegen Zellen mit Standardtechniken. Eine gefilterte, belüfteten Kappe kann in den Kolben gegeben werden. </li></ol> 6. Mature Adipocyte Dedifferenzierung in einer 6-Well-Platte <ol><li> Legen Sie ein Deckglas auf dem Boden jeder Vertiefung einer Platte mit 6 Vertiefungen </li><li> Fügen Sie einen ½ &quot;Kunststoffbuchse auf der jeweils Deckglas. </li><li> Füllen Vertiefungen mit 8 ml 20% Kälberserum-DMEM Medium. </li><li> Setzen Sie ein Deckglas auf jedem Kunststoffbuchse. </li><li> Legen Pipettenspitze zwischen dem Schieber und dem Rohr, Zellen unter dem Objektträger zu injizieren (50.000 Zellen pro Vertiefung). </li><li> Platten in einem Standardzellkulturbrutschrank bei 37 ° C mit 5% CO 2 für eine Woche. </li><li> Reverse Deckglas mit anhaftenden Zellen in jeder Vertiefung, die 2 ml Medium mit 20% Kälberserum und verfolgen Kultur. </li><li> Verwenden Deck mit Zellen, die eine Dedifferenzierung für mehrere Zwecke, einschließlich Immunfluoreszenz (Technik nicht gezeigt). </li></ol>

<ol>
	<li>Zhang, H. H., Kumar, S., Barnett, A. H., Eggo, M. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ceiling+culture+of+mature+human+adipocytes:+use+in+studies+of+adipocyte+functions.">Ceiling culture of mature human adipocytes: use in studies of adipocyte functions.</a> J Endocrinol. 164 (2), 119-128 (2000).</li><li>Matsumoto, T., 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=Mature+adipocyte-derived+dedifferentiated+fat+cells+exhibit+multilineage+potential.">Mature adipocyte-derived dedifferentiated fat cells exhibit multilineage potential.</a> J Cell Physiol. 215 (1), 210-222 (2008).</li><li>Poloni, 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=Human+dedifferentiated+adipocytes+show+similar+properties+to+bone+marrow-derived+mesenchymal+stem+cells.">Human dedifferentiated adipocytes show similar properties to bone marrow-derived mesenchymal stem cells.</a> Stem Cells. 30 (5), 965-974 (2012).</li><li>Perrini, 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=Differences+in+gene+expression+and+cytokine+release+profiles+highlight+the+heterogeneity+of+distinct+subsets+of+adipose+tissue-derived+stem+cells+in+the+subcutaneous+and+visceral+adipose+tissue+in+humans.">Differences in gene expression and cytokine release profiles highlight the heterogeneity of distinct subsets of adipose tissue-derived stem cells in the subcutaneous and visceral adipose tissue in humans.</a> PLoS One. 8 (3), e57892 (2013).</li><li>Kishimoto, 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+osteoblastic+differentiation+ability+of+human+dedifferentiated+fat+cells+is+higher+than+that+of+adipose+stem+cells+from+the+buccal+fat+pad.">The osteoblastic differentiation ability of human dedifferentiated fat cells is higher than that of adipose stem cells from the buccal fat pad.</a> Clin Oral Investig. , (2013).</li><li>Kou, 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=The+phenotype+and+tissue-specific+nature+of+multipotent+cells+derived+from+human+mature+adipocytes.">The phenotype and tissue-specific nature of multipotent cells derived from human mature adipocytes.</a> Biochem Biophys Res Commun. 444 (4), 543-548 (2014).</li><li>Jumabay, 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=Pluripotent+stem+cells+derived+from+mouse+and+human+white+mature+adipocytes.">Pluripotent stem cells derived from mouse and human white mature adipocytes.</a> Stem Cells Transl Med. 3 (2), 161-171 (2014).</li><li>Sugawara, A., Sato, S. <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+dedifferentiated+fat+cells+for+periodontal+tissue+regeneration.">Application of dedifferentiated fat cells for periodontal tissue regeneration.</a> Hum Cell. 27 (1), 12-21 (2014).</li><li>Kikuta, 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=Osteogenic+effects+of+dedifferentiated+fat+cell+transplantation+in+rabbit+models+of+bone+defect+and+ovariectomy-induced+osteoporosis.">Osteogenic effects of dedifferentiated fat cell transplantation in rabbit models of bone defect and ovariectomy-induced osteoporosis.</a> Tissue Eng Part A. 19 (15-16), 1792-1802 (2013).</li><li>Obinata, D., 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=Transplantation+of+mature+adipocyte-derived+dedifferentiated+fat+(DFAT)+cells+improves+urethral+sphincter+contractility+in+a+rat+model.">Transplantation of mature adipocyte-derived dedifferentiated fat (DFAT) cells improves urethral sphincter contractility in a rat model.</a> Int J Urol. 18 (12), 827-834 (2011).</li><li>Jumabay, 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=Dedifferentiated+fat+cells+convert+to+cardiomyocyte+phenotype+and+repair+infarcted+cardiac+tissue+in+rats.">Dedifferentiated fat cells convert to cardiomyocyte phenotype and repair infarcted cardiac tissue in rats.</a> J Mol Cell Cardiol. 47 (5), 565-575 (2009).</li><li>Ohta, Y., 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=Mature+adipocyte-derived+cells,+dedifferentiated+fat+cells+(DFAT),+promoted+functional+recovery+from+spinal+cord+injury-induced+motor+dysfunction+in+rats.">Mature adipocyte-derived cells, dedifferentiated fat cells (DFAT), promoted functional recovery from spinal cord injury-induced motor dysfunction in rats.</a> Cell Transplant. 17 (8), 877-886 (2008).</li><li>Moreno-Navarrete, J. M. F. -. r., Symonds, 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=Ch.+2.">Ch. 2.</a> Adipose Tissue Biology. , 17-38 (2012).</li><li>Poulos, S. P., Dodson, M. V., Hausman, G. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cell+line+models+for+differentiation:+preadipocytes+and+adipocytes.">Cell line models for differentiation: preadipocytes and adipocytes.</a> Exp Biol Med (Maywood. 235 (10), 1185-1193 (2010).</li><li>Casteilla, L., Penicaud, L., Cousin, B., Calise, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Choosing+an+adipose+tissue+depot+for+sampling:+factors+in+selection+and+depot+specificity).">Choosing an adipose tissue depot for sampling: factors in selection and depot specificity).</a> Methods Mol Biol. 456, 23-38 (2008).</li><li>Tchernof, A., Despres, J. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pathophysiology+of+human+visceral+obesity:+an+update.">Pathophysiology of human visceral obesity: an update.</a> Physiol Rev. 93 (1), 359-404 (2013).</li><li>Rodbell, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Metabolism+of+Isolated+Fat+Cells.+I.+Effects+of+Hormones+on+Glucose+Metabolism+and+Lipolysis.">Metabolism of Isolated Fat Cells. I. Effects of Hormones on Glucose Metabolism and Lipolysis.</a> J Biol Chem. 239, 375-380 (1964).</li><li>Watson, J. E., 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+Markers+and+Functional+Attributes+of+Human+Adipose-Derived+Stem+Cells+and+Dedifferentiated+Adipocyte+Cells+from+Subcutaneous+Fat+of+an+Obese+Diabetic+Donor.">Comparison of Markers and Functional Attributes of Human Adipose-Derived Stem Cells and Dedifferentiated Adipocyte Cells from Subcutaneous Fat of an Obese Diabetic Donor.</a> Adv Wound Care. 3 (3), 219-228 (2014).</li></ol>

The authors declare no conflict of interest.

Entdifferenzierung von reifen Fettzellen mit der Decke Kulturtechnik ist ein neues Konzept für die Fettgewebestammzellen aus einer kleinen Probe von einheimischen Fettgewebe erhalten. Aufgrund unserer Erfahrungen und die der anderen 2 ist ein Gramm Gewebe ausreichend, um eine 25-cm 2-Kolben Platte und eine Bevölkerung von DFAT Zellen, für die Homogenität von Poloni und Mitarbeiter 3 gezeigt zu erhalten. Adipocyte Entdifferenzierung scheint mit Zellen von jedem Spender möglich, unabh...

In vitro dedifferentiation of mature adipocytes is achieved through a technique called ceiling culture1. Because of their natural tendency to float in aqueous solutions, isolated mature adipocytes adhere to the surface of an inverted flask fully filled with culture medium. Over a few days, cells modify their spherical morphology and become fibroblast-like cells. The resulting cells, called dedifferentiated fat (DFAT) cells, are multipotent2. Research articles on adipocyte dedifferentiation, especially on human cells, are limited. However, they have already provided interesting information regarding multipotency, cell phenotype and replicative capacity of DFAT cells2. Mature adipocytes originating from various fat compartments have been successfully dedifferentiated including those originating from human visceral and subcutaneous adipose tissues2-4. In addition to these depots, Kishimoto and collaborators sampled adipose tissue from the buccal fat pads and dedifferentiated adipocytes into DFAT cells5. Matsumoto and collaborators successfully generated subcutaneous DFAT cells from patients covering a wide range of ages, and the majority of cells had a high proliferative rate and less than 6% of senescence even after 10 passages in culture2.
DFAT cells have been successfully re-differentiated into several lineages, including adipogenic, osteogenic, chondrogenic and neurogenic lineages2,3,6. These cells express several embryonic stem cell markers such as Nanog and the four identified pluripotent factors Oct4, c-myc, Klf4 and Sox23. They also express markers specific to each of the three germ layers7. In addition, DFAT cells are similar to Bone Marrow-derived Mesenchymal Stem Cells (BM-derived MSC) based on their epigenetic signature3. Exploiting the stem cell capacity of DFAT cells, many groups have investigated their potential to treat or improve various diseases8,9. Improvements of pathologic conditions, such as infracted cardiac tissue, spinal cord injury and urethral sphincter dysfunction, have been observed with DFAT cell injections in rat models of disease10-12. 
In addition to the stem cell properties of DFAT cells, they may represent a new cellular model for adipocyte physiology studies. The 3T3-L1 cell line is often used for this purpose as these cells differentiate into adherent, lipid-storing adipocytes under adipogenic stimulation13. However, these cells originate from mouse embryo tissue13. Also, depot-specificity cannot be investigated with this model and it may not fully reflect human adipocyte physiology14. Other laboratories work with isolated adipose cells from murine fat depots, but fat distribution is not dimorphic in mice and anatomical configuration of the rodent's abdominal cavity prevents from extrapolating directly to humans15. In order to study adipocytes in the context of the physiopathology of human obesity, consideration of body fat distribution and fat depot-specific differences has become essential16. Some limitations of primary preadipocyte cultures, including cell quantities obtained from adipose tissue biopsy samples and their senescence after a few passages in culture, created the need for alternate models. Perrini and collaborators investigated depot-specificity in gene expression of DFAT cells originating from visceral and subcutaneous fat and compared them to adipose-derived stem cells (ASC) from the same fat depot. They demonstrated that differences in gene expression and function where mainly found between depots than between cell types, suggesting that DFAT cells are physiologically close to ASC from the same depot. DFAT cells may represent an interesting alternative to available models for studies on fat distribution in the pathophysiology of human obesity. Moreover, ceiling culture is a promising method to obtain adult stem cells for tissue engineering purposes. 
Here, we describe collagenase digestion, a widely-used technique to isolate mature adipocytes from the subcutaneous and/or visceral fat samples17, and the subsequent steps to perform ceiling culture and dedifferentiate these cells into multipotent, fibroblast-like cells.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>Bovine serum albumine</td>
			<td>Sigma</td>
			<td>A7906</td>
			<td></td>
		</tr>
		<tr>
			<td>Adenosine</td>
			<td>Sigma</td>
			<td>A4036</td>
			<td></td>
		</tr>
		<tr>
			<td>Ascorbic acid</td>
			<td>Sigma</td>
			<td>A0278</td>
			<td></td>
		</tr>
		<tr>
			<td>NaCl</td>
			<td></td>
			<td></td>
			<td>Any brand can be used</td>
		</tr>
		<tr>
			<td>KCl</td>
			<td></td>
			<td></td>
			<td>Any brand can be used</td>
		</tr>
		<tr>
			<td>CaCl2</td>
			<td></td>
			<td></td>
			<td>Any brand can be used</td>
		</tr>
		<tr>
			<td>MgCl2</td>
			<td></td>
			<td></td>
			<td>Any brand can be used</td>
		</tr>
		<tr>
			<td>KH2PO4</td>
			<td></td>
			<td></td>
			<td>Any brand can be used</td>
		</tr>
		<tr>
			<td>HEPES</td>
			<td></td>
			<td></td>
			<td>Any brand can be used</td>
		</tr>
		<tr>
			<td>Glucose</td>
			<td></td>
			<td></td>
			<td>Any brand can be used</td>
		</tr>
		<tr>
			<td>Type I collagenase</td>
			<td>Worthington Biochemical Corp</td>
			<td>LS-004196</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM/F-12, HEPES, no phenol red</td>
			<td>Gibco-Life Technologies</td>
			<td>11039-021</td>
			<td>Add to medium : 20% calf serum, gentamicin (50&#181;g/ml) and fungizone (2.5&#181;g/ml)</td>
		</tr>
		<tr>
			<td>Calf Serum, iron supplemented, from formula-fed calves</td>
			<td>Sigma</td>
			<td>C8056-500ml</td>
			<td></td>
		</tr>
		<tr>
			<td>1/2 In plastic bushing</td>
			<td>Iberville</td>
			<td>2704-CP</td>
			<td>SKU:1000120918 (Home Depot)</td>
		</tr>
		<tr>
			<td>Liquid nitrogen</td>
			<td>Linde</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Formalin soluton, neutral buffered, 10%</td>
			<td>SIGMA</td>
			<td>HT501128</td>
			<td></td>
		</tr>
		<tr>
			<td>Sterile tweezers</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Sterile scissors</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>60cc syringes</td>
			<td>BD Syringe</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Plastic tubing</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Krebs-Ringer-Henseleit stock buffer (KRH)</td>
			<td></td>
			<td></td>
			<td>Prepare stock buffer as following: 25mM HEPES pH7.6, 125mM NaCl, 3.73mM KCl, 5mM CaCl2.2H2O, 2.5mM MgCl2.6H2O, 1mM K2HPO4. Adjust pH to 7.4.</td>
		</tr>
		<tr>
			<td>Krebs-Ringer-Henseleit-Working Buffer (KRH-WB)</td>
			<td></td>
			<td></td>
			<td>Add the following components freshly to KRH buffer: 4% bovine serum albumin, 5mM glucose, 0.1&#181;M adenosine, 560 &#181;M ascorbic acid</td>
		</tr>
		<tr>
			<td>KRH-WB supplemented with Type I collagenase</td>
			<td></td>
			<td></td>
			<td>Add 350U/ml of Type I collagenase</td>
		</tr>
		<tr>
			<td>T25 unvented cap tissue culture flask</td>
			<td>Sarsted or other brand</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>6-well tissue culture plate</td>
			<td>BD Falcon or other brand</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Microscope cover glass 22x22</td>
			<td>Fisherbrand</td>
			<td>12-542-B</td>
			<td></td>
		</tr>
		<tr>
			<td>Sterile beakers</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
	</tbody>
</table>

generation of human adipose stem cells through dedifferentiation of mature adipocytes in ceiling cultures

Mature adipocytes have been shown to reverse their phenotype into fibroblast-like cells in vitro through a technique called ceiling culture. Mature adipocytes can also be isolated from fresh adipose tissue for depot-specific characterization of their function and metabolic properties. Here, we describe a well-established protocol to isolate mature adipocytes from adipose tissues using collagenase digestion, and subsequent steps to perform ceiling cultures. Briefly, adipose tissues are incubated in a Krebs-Ringer-Henseleit buffer containing collagenase to disrupt tissue matrix. Floating mature adipocytes are collected on the top surface of the buffer. Mature cells are plated in a T25-flask completely filled with media and incubated upside down for a week. An alternative 6-well plate culture approach allows the characterization of adipocytes undergoing dedifferentiation. Adipocyte morphology drastically changes over time of culture. Immunofluorescence can be easily performed on slides cultivated in 6-well plates as demonstrated by FABP4 immunofluorescence staining. FABP4 protein is present in mature adipocytes but down-regulated through dedifferentiation of fat cells. Mature adipocyte dedifferentiation may represent a new avenue for cell therapy and tissue engineering.

Wichtige morphologische Veränderungen auftreten, um Fettzellen während der Entdifferenzierung (Abbildung 1) zu reifen. Wie in Figur 2 gezeigt ist, wurden Zellen, die eine Dedifferenzierung mit einem Anti FABP4 Antikörper zur Fluoreszenz-Analyse gefärbt. Zellen mit einem runden Morphologie äußerte die FABP4 Protein, während die Mehrheit der Fibroblasten-ähnlichen Zellen nicht. Nach Entdifferenzierung kann DFAT Zellen mit Standardverfahren für mehrere Passagen kultiviert werden. ...

Watch this Scientific Journal Video about Generation of Human Adipose Stem Cells through Dedifferentiation of Mature Adipocytes in Ceiling Cultures at JoVE.com

Generation of Human Adipose Stem Cells through Dedifferentiation of Mature Adipocytes in Ceiling Cultures

Mature adipocytes may represent an abundant source of stem cells through dedifferentiation, which leads to a homogenous population of fibroblast-like cells. Collagenase digestion is used to isolate mature adipocytes from human fat. The goal of our protocol is to obtain multipotent, dedifferentiated fat cells from human mature adipocytes.

Generation of Human Fettgewebestammzellen durch Dedifferenzierung der Reife Adipozyten in Decken Kulturen

Mature adipocytes have been shown to reverse their phenotype into fibroblast-like cells in vitro through a technique called ceiling culture. Mature ...

generation-human-adipose-stem-cells-through-dedifferentiation-mature

Research

JoVE Journal

Developmental Biology

11.6K Aufrufe.  IUCPQ Research Center. Mature adipocytes may represent an abundant source of stem cells through dedifferentiation, which leads to a homogenous population of fibroblast-like cells. Collagenase digestion is used to isolate mature adipocytes from human fat. The goal of our protocol is to obtain multipotent, dedifferentiated fat cells from human mature adipocytes.