Summary

Isolement et enrichissement du tissu adipeux humain cellules stromales pour ostéogenèse accrue

Published: January 12, 2015
doi:

Summary

The transcriptional heterogeneity within human adipose-derived stromal cells can be defined on the single cell level using cell surface markers and osteogenic genes. We describe a protocol utilizing flow cytometry for the isolation of cell subpopulations with increased osteogenic potential, which may be used to enhance craniofacial skeletal reconstruction.

Abstract

Bone marrow-derived mesenchymal stromal cells (BM-MSCs) are considered the gold standard for stem cell-based tissue engineering applications. However, the process by which they must be harvested can be associated with significant donor site morbidity. In contrast, adipose-derived stromal cells (ASCs) are more readily abundant and more easily harvested, making them an appealing alternative to BM-MSCs. Like BM-MSCs, ASCs can differentiate into osteogenic lineage cells and can be used in tissue engineering applications, such as seeding onto scaffolds for use in craniofacial skeletal defects. ASCs are obtained from the stromal vascular fraction (SVF) of digested adipose tissue, which is a heterogeneous mixture of ASCs, vascular endothelial and mural cells, smooth muscle cells, pericytes, fibroblasts, and circulating cells. Flow cytometric analysis has shown that the surface marker profile for ASCs is similar to that for BM-MSCs. Despite several published reports establishing markers for the ASC phenotype, there is still a lack of consensus over profiles identifying osteoprogenitor cells in this heterogeneous population. This protocol describes how to isolate and use a subpopulation of ASCs with enhanced osteogenic capacity to repair critical-sized calvarial defects.

Introduction

The heterogeneous nature of stem cell populations is not yet fully understood and remains a major impediment to the development of clinically effective stem cell-based therapeutic applications. One of the most common ways to characterize a heterogeneous population of stem cells is to employ a cell sorting method, such as fluorescence-activated cell sorting (FACS), to separate cells based on their surface marker expression profiles. As sorting methods become more complex, it becomes possible to identify more distinct functional subpopulations of cells. Microfluidic-based technologies are becoming more and more frequently utilized in analysis of gene expression at the single cell level. Multiplexed quantitative polymerase chain reaction (qPCR) within a microfluidic chip allows for effective and reliable high-resolution, single cell transcriptional analysis.1-5

In a previous study using single cell transcriptional profiling of 48 genes, considerable transcriptional heterogeneity was observed among ASCs.6 However, the distribution of genes MSX2, BMP-5, BMP-7, ALP, OCN, RUNX2 exhibited a strong association with a cluster of cells possessing highly osteogenic transcriptional profiles. To isolate cells according to this osteogenic gene expression profile, surface antigen expression patterns were correlated with transcription patterns and surface marker expression of endoglin (CD105) was subsequently discovered to closely correlate with enhanced osteogenic differentiation potential of ASCs. Independent of CD105 expression, expression of surface receptor Thy-1 (CD90), a glycosyl-phosphatidylinositol-linked membrane protein previously shown by Chen et al. to be associated with osteoprogenitor cells, was also correlated with osteogenic gene expression.6,7 These findings provide the opportunity to prospectively isolate subpopulations within the larger heterogeneous pool of ASCs with increased osteogenic capacity for cell-based bone tissue engineering applications.

Protocol

REMARQUE: Tous les échantillons de patients ont été obtenus avec le consentement éclairé, et les protocoles expérimentaux ont été examinés et approuvés par le Conseil d'examen Stanford University institutionnel (Protocole N ° 2188 et # 9999). 1. Isolement et culture cellulaire: Obtenir le tissu adipeux sous-cutané humain provenant de patients sains de sexe féminin subissant lipoaspiration élective de l'abdomen, du flanc, et / région ou de la cuisse sous anes…

Representative Results

Utilisation de CD90 en tant que marqueur pour des cellules avec des résultats améliorés d'ostéogenèse en isolement d'une population hautement enrichi de CSA humains (Figure 1A, 1B). CSA ont été colorées avec Pacific Blue-CD45 anti-humain conjugué, conjugué à FITC anti-CD105 humain, et APC conjugué anti-CD90 humain. Après le tri, le niveau de pureté était supérieure à 98%, telle que quantifiée par une analyse post-tri. Définir les groupes de cellule…

Discussion

Actuellement, l'isolement des sous-populations homogènes de CSA de la SVF de tissu adipeux humain reste un défi si objectif souhaitable. L'isolement de sous-populations de l'ASC pro-ostéogéniques est particulièrement souhaitable, car ces cellules peuvent être utilisées pour étudier la formation et l'homéostasie des tissus squelettiques. Toutefois, le SVF du tissu adipeux abrite hétérogénéité significative en ce qui concerne d'endiguer la capacité des cellules et le potentiel de différ…

Disclosures

The authors have nothing to disclose.

Acknowledgements

Cette étude a été soutenue par les Instituts nationaux de recherche en santé subvention R01-DE021683-01 et National Institutes of Health Research subvention R01-DE019434 à MTL; Howard Hughes Medical Institute bourse de recherche à MTCDCW a été soutenu par l'ACS Franklin Martin Faculté de bourses de recherche, le laboratoire Hagey for Pediatric médecine régénérative, et de la Faculté Scholar Award Child Health Research Institute de l'Université de Stanford.

Materials

Name of Reagent/Material Company Catalog Number Comments
Disposable 250 mL Conical Tubes Corning (Thomas Scientific) 2602A43
Penicillin-Streptomycin (10,000 U/mL) Gibco 15140-122
DMEM, high glucose, GlutaMAX Supplement Gibco 10566-016
PBS, pH 7.4 Gibco 10010-023
Betadine – Antiseptic Povidone/Iodine Solution Purdue  PFC-67618015017
Hank's Balanced Salt Solution, 1X Cellgro 21-023-CV
Fetal Bovine Serum, Certified, US Origin Gibco 16000-044
Collagenase from Clostridium histolyticum Sigma-Aldrich C0130-5G
ACCUTASE Cell Detachment Solution Stem Cell Technologies 7920
APC Mouse Anti-Human CD90 BD Pharmingen 559869
FITC Mouse anti-Human CD105 (Endoglin) BD Pharmingen 561443
Anti-Human CD45 eFluor 450 (Pacific Blue replacement)  eBioscience 48-9459-41
Anti-Human CD34 APC eBioscience 17-0349-41
Anti-Human CD31 (PECAM-1) PE eBioscience 12-0319-41
Streptavidin PE-Cyanine7 eBioscience 25-4317-82
BD FACS Aria II instrument BD Biosciences
BD FACSDiva Software BD Biosciences

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Cite This Article
Zielins, E. R., Tevlin, R., Hu, M. S., Chung, M. T., McArdle, A., Paik, K. J., Atashroo, D., Duldulao, C. R., Luan, A., Senarath-Yapa, K., Walmsley, G. G., Wearda, T., Longaker, M. T., Wan, D. C. Isolation and Enrichment of Human Adipose-derived Stromal Cells for Enhanced Osteogenesis. J. Vis. Exp. (95), e52181, doi:10.3791/52181 (2015).

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