Clusterin (Apo J) regulates vascular smooth muscle cell differentiation in vitro.
Previously we reported a significant and substantial increase in the synthesis and secretion of clusterin in cultured porcine vascular smooth muscle cells (VSMC) during the time when the VSMC culture modulates from a proliferating monolayer morphology to a nodular cell culture morphology. That in vitro process appears to recapitulate some aspects of in vivo vascular remodeling in response to injury and is facilitated by the presence of a well-developed extracellular matrix. To directly test the hypothesis that clusterin regulates VSMC phenotypic modulation, cultured VSMC were stably transfected with an expression plasmid containing the full-length murine clusterin sequence in antisense orientation. Twenty-four clones were selected on the basis of neomycin resistance and characterized for clusterin expression and culture morphology. In contrast to clone SM-CLU18AS, which expresses a high level of clusterin and forms multicellular nodules, clone SM-CLU13AS expresses a low level of clusterin and does not form nodules even in the presence of a preformed collagen gel. Importantly, clusterin-negative SM-CLU13AS retains the ability to form nodules in an environment containing exogenous clusterin. SM-CLU13AS forms nodules when cultured in Matrigel (which contains clusterin) and in the presence of clusterin-containing conditioned media prepared from nodular SMC cultures or SM-CLU18AS cultures. These results demonstrate that clusterin is required for VSMC nodule formation and suggest that it may play a role in smooth muscle cell reorganization in the vascular wall.
Moulson
C L
CL
Center for the Study of Comparative Functional Genomics, Department of Biological Sciences, State University of New York at Albany, 12222, USA.
Millis
A J
AJ
D000818:Animals; D002454:Cell Differentiation / Q000502:physiology; D002999:Clone Cells / Q000166:cytology; D051152:Clusterin; D006023:Glycoproteins / Q000502:physiology*; D018832:Molecular Chaperones; D009131:Muscle, Smooth, Vascular / Q000166:cytology*; D013552:Swine
D051152:Clusterin; D006023:Glycoproteins; D018832:Molecular Chaperones