© 1999 American Heart Association, Inc.
Vascular Biology |
Versican/PG-M Isoforms in Vascular Smooth Muscle Cells
From the Department of Pathology (J.M.L., K.R.B., E.D.K., S.M.S., T.N.W.), University of Washington, Seattle; and the Department of Pharmacology (P.M.), New York University Medical Center, New York. Present address of P.M., Department of Cell Biology, New York University Medical Center, New York, NY 10016.
Correspondence to Joan M. Lemire, Department of Pathology, University of Washington, 1959 NE Pacific Street HSB E-508, Box 357470, Seattle, WA 98195. E-mail joanlemi{at}u.washington.edu
Abstract—The expression of increased amounts of proteoglycans in the extracellular matrix may play a role in vascular stenosis and lipid retention. The large chondroitin sulfate proteoglycan versican is synthesized by vascular smooth muscle cells (SMCs), accumulates during human atherosclerosis and restenosis, and has been shown to bind LDLs. We recently demonstrated that adult rat aortic SMCs express several versican mRNAs. Four versican splice variants, V0, V1, V2, and V3, have recently been described, which differ dramatically in length. These variants differ in the extent of modification by glycosaminoglycan chains, and V3 may lack glycosaminoglycan chains. In this study, we characterized versican RNAs from rat SMCs by cloning, sequencing, and hybridization with domain-specific probes. DNA sequence was obtained for the V3 isoform, and for a truncated V0 isoform. By hybridization of polyadenylated RNA with domain-specific probes, we determined that the V0, V1, and V3 isoforms are present in vascular SMCs. We confirmed the presence of the V3 isoform in polyadenylated RNA and in RT-PCR products by hybridization with an oligonucleotide that spans the splice junction between the hyaluronan-binding domain and the epidermal growth factor-like domain. In addition, a novel splice variant was cloned by PCR amplification from both rat and human SMC RNA. This appears to be an incompletely spliced variant, retaining the final intron. PCR analysis shows that this intron can be retained in both V1 and V3 isoforms. The predicted translation product of this variant would have a different carboxy-terminus than previously described versican isoforms.
Key Words: proteoglycan-M • proteoglycan • splicing • vascular smooth muscle • unspliced
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