Characterization of syndecan-4 expression in 3T3-F442A mouse adipocytes: link between syndecan-4 induction and cell proliferation.
Heparan sulfate proteoglycans are found on the surface of most cells. Syndecan-4 is a widely expressed transmembrane heparan sulfate proteoglycan. Using quantitative RNase protection assays and immunoblotting, syndecan-4 expression was characterized in 3T3-F442A mouse adipoblasts. These cells exhibit dramatic changes in their biological and morphological characteristics during differentiation to adipocytes. During this process, the levels of syndecan-4 protein and mRNA expression changed dramatically. They peaked at the time when quiescent cells reentered the cell cycle before differentiation. Serum depletion-repletion also replicated the syndecan-4 mRNA induction when the cells were released back into proliferation, and a cycloheximide treatment abolished the peak of induction. In addition, inhibiting syndecan-4 induction with antisense oligonucleotides inhibited the proliferation of 3T3-F442A cells. In the terminally differentiated adipocytes characterized by the loss of proliferation capability, the serum inducibility of syndecan-4 is repressed, emphasizing the link between syndecan-4 induction in 3T3-F442A cells and cell proliferation.
Landry
R
R
Division of Nutritional Sciences, Cornell University, Ithaca, New York 14853, USA.
Rioux
V
V
Bensadoun
A
A
D016475:3T3 Cells; D017667:Adipocytes / Q000378:metabolism*; D000818:Animals; D002455:Cell Division; D002460:Cell Line; D018076:DNA, Complementary / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D015151:Immunoblotting; D008562:Membrane Glycoproteins / Q000096:biosynthesis*; D051379:Mice; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D011509:Proteoglycans / Q000096:biosynthesis*; D012333:RNA, Messenger / Q000378:metabolism; D012260:Ribonucleases / Q000378:metabolism; D053671:Syndecan-4; D013997:Time Factors
D018076:DNA, Complementary; D008562:Membrane Glycoproteins; D016376:Oligonucleotides, Antisense; D011509:Proteoglycans; D012333:RNA, Messenger; C508306:Sdc4 protein, mouse; D053671:Syndecan-4; D012260:Ribonucleases