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Biochem Biophys Res Commun. 2015 Feb 27;458(1):117-22. doi: 10.1016/j.bbrc.2015.01.078. Epub 2015 Jan 28.

The primary cilium undergoes dynamic size modifications during adipocyte differentiation of human adipose stem cells.

Author information

1
University of Nice Sophia Antipolis, UFR Sciences, Nice F-06108, France; CNRS, UMR7277, F-06108, France; Inserm, U1091, Nice F-06108, France.
2
Centre Commun de Microscopie Appliquée, University of Nice Sophia Antipolis, UFR Sciences, 13 Parc Valrose, F-06108 Nice, France.
3
University of Nice Sophia Antipolis, UFR Sciences, Nice F-06108, France; CNRS, UMR7277, F-06108, France; Inserm, U1091, Nice F-06108, France. Electronic address: peraldi@unice.fr.

Abstract

The primary cilium is an organelle present in most of the cells of the organism. Ciliopathies are genetic disorders of the primary cilium and can be associated with obesity. We have studied the primary cilium during adipocyte differentiation of human adipose stem cells (hASC). We show here that the size of the primary cilium follows several modifications during adipocyte differentiation. It is absent in growing cells and appears in confluent cells. Interestingly, during the first days of differentiation, the cilium undergoes a dramatic elongation that can be mimicked by dexamethasone alone. Thereafter, its size decreases. It can still be detected in cells that begin to accumulate lipids but is absent in cells that are filled with lipids. The cilium elongation does not seem to affect the localization of proteins associated with the cilium such as Kif3-A or Smoothened. However, Hedgehog signaling, an anti-adipogenic pathway dependent on the primary cilium, is inhibited after three days of differentiation, concomitantly with the cilium size increase. Together, these results shed new light on the primary cilium and could provide us with new information on adipocyte differentiation under normal and pathological conditions.

KEYWORDS:

Adipocyte differentiation; Human adipose stem cells; Primary cilium

PMID:
25637533
DOI:
10.1016/j.bbrc.2015.01.078
[Indexed for MEDLINE]

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