Mesenchymal Stromal Cells Differentiating to Adipocytes Accumulate Autophagic Vesicles Instead of Functional Lipid Droplets.

Abstract:

:Adult bone marrow mesenchymal stromal cells (BMSCs) can easily be differentiated into a variety of cells. In vivo transplantation of BMSCs-differentiated cells has had limited success, suggesting that these cells may not be fully compatible with the cells they are intended to replace in vivo. We investigated the structural and functional features of BMSCs-derived adipocytes as compared with adipocytes from adipose tissue, and the structure and functionality of lipid vesicles formed during BMSCs differentiation to adipocytes. Gas chromatography-mass spectrometry showed fatty acid composition of BMSCs-derived adipocytes and adipocytes from the adipose tissue to be very different, as is the lipid rafts composition, caveolin-1 expression, caveolae distribution in their membranes, and the pattern of expression of fatty acid elongases. Confocal microscopy confirmed the absence from BMSCs-derived adipocytes of markers of lipid droplets. BMSCs-derived adipocytes cannot convert deuterated glucose into deuterated species of fatty acids and cannot uptake the deuterated fatty acid-bovine serum albumin complexes from the culture medium, suggesting that intra-cellular accumulation of lipids does not occur by lipogenesis. We noted that BMSCs differentiation to adipocytes is accompanied by an increase in autophagy. Autophagic vesicles accumulate in the cytoplasm of BMSCs-derived adipocytes and their size and distribution resembles that of Nile Red-stained lipid vesicles. Stimulation of autophagy in BMSCs triggers the intra-cellular accumulation of lipids, while inhibition of autophagy prevents this accumulation. In conclusion, differentiation of BMSCs-derived adipocytes leads to intra-cellular accumulation of autophagic vesicles rather than functional lipid droplets, suggesting that these cells are not authentic adipocytes. J. Cell. Physiol. 231: 863-875, 2016. © 2015 Wiley Periodicals, Inc.

journal_name

J Cell Physiol

authors

Gruia AT,Suciu M,Barbu-Tudoran L,Azghadi SM,Cristea MI,Nica DV,Vaduva A,Muntean D,Mic AA,Mic FA

doi

10.1002/jcp.25177

subject

Has Abstract

pub_date

2016-04-01 00:00:00

pages

863-75

issue

4

eissn

0021-9541

issn

1097-4652

journal_volume

231

pub_type

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