The A10 cell line: a model for neonatal, neointimal, or differentiated vascular smooth muscle cells?

Abstract:

OBJECTIVES:The A10 cell line was derived from the thoracic aorta of embryonic rat and is a commonly used model of vascular smooth muscle cells (VSMC). Despite its wide use this cell line has not been well characterized. This is especially important in light of recent evidence of phenotypically distinct cell populations isolated from rat vascular tissue. Therefore, the present study was undertaken to confirm the VSMC nature of A10 cells and to investigate whether these cells particularly resemble adult, neonatal, or neointimal rat VSMC. METHODS:A variety of defining characteristics were used that included immunofluorescent analysis for smooth muscle alpha-actin, smooth and non-muscle myosin heavy chains, desmin and vimentin; Western analysis for smooth muscle and non-muscle myosin heavy chains; mRNA analysis for smooth muscle myosin heavy chain, calponin, SM22 alpha, tropoelastin and PDGF-B peptide; and functional assays of cell migration, proliferation and agonist induced intracellular Ca transients. RESULTS:A10 cells expressed smooth muscle alpha-actin, SM22 alpha, smooth muscle calponin and vimentin, characteristic of in vivo rat VSMCs; however they also resembled de-differentiated smooth muscle cells in that they expressed non-muscle myosin rather than smooth muscle myosin heavy chain. A10 cells resembled cultured rat neonatal smooth muscle cells ("pup cells") in that they had an epithelioid shape and lacked functional PDGF-alpha receptors: however they did not express PDGF-B mRNA or proliferate in low serum containing medium as do neonatal cells. A10 cells had several characteristics in common with neointimal cells including the expression of alpha-actin, vimentin, and non-muscle myosin and the lack of expression of PDGF-B mRNA as well as the ability to migrate in response to PDGF-BB. CONCLUSION:In conclusion, A10 cells are nondifferentiated VSMC that differ from neonatal but bear significant resemblance to neointimal cells.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

Rao RS,Miano JM,Olson EN,Seidel CL

doi

10.1016/s0008-6363(97)00156-9

subject

Has Abstract

pub_date

1997-10-01 00:00:00

pages

118-26

issue

1

eissn

0008-6363

issn

1755-3245

pii

S0008636397001569

journal_volume

36

pub_type

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