TY - JOUR
T1 - Strial marginal cells play a role in basement membrane homeostasis
T2 - In vitro and in vivo evidence
AU - Gratton, Michael Anne
AU - Meehan, Daniel T.
AU - Smyth, Brendan J.
AU - Cosgrove, Dominic
PY - 2002
Y1 - 2002
N2 - The interaction of extracellular matrix and receptors plays a role in tissue homeostasis. The thickened strial capillary basement membrane (SCBM) reported in animal models of presbycusis and Alport's syndrome might be secondary to elevated synthesis and/or decreased turnover of specific basement membrane (BM) components. In this study, expression of specific BM proteins, integrin receptors and mediators of matrix turnover in the murine lateral wall were determined using cDNA probes and antibodies. The presence of collagen α1 and α2(IV) and laminin-8 in the SCBM was verified. The integrin subunits α3, αv and β1, cell surface receptors for the BM proteins, localized primarily to the SCBM and/or the strial marginal cells as did TIMP-3, a tissue inhibitor of matrix metalloproteinase. The epithelial cell line SV-k1, derived from the lateral wall of the 'immortomouse', showed expression of the same BM proteins as well as demonstrating the presence of markers specific to strial marginal cells, namely Na,K-ATPase α1 and β2 subunits. Thus, the cultured cells are identified as deriving from marginal cells of the stria vascularis. Moreover, these data suggest that a culture system using this marginal cell line will be useful to delineate mechanisms underlying the pathologic accumulation of extracellular matrix in the SCBM.
AB - The interaction of extracellular matrix and receptors plays a role in tissue homeostasis. The thickened strial capillary basement membrane (SCBM) reported in animal models of presbycusis and Alport's syndrome might be secondary to elevated synthesis and/or decreased turnover of specific basement membrane (BM) components. In this study, expression of specific BM proteins, integrin receptors and mediators of matrix turnover in the murine lateral wall were determined using cDNA probes and antibodies. The presence of collagen α1 and α2(IV) and laminin-8 in the SCBM was verified. The integrin subunits α3, αv and β1, cell surface receptors for the BM proteins, localized primarily to the SCBM and/or the strial marginal cells as did TIMP-3, a tissue inhibitor of matrix metalloproteinase. The epithelial cell line SV-k1, derived from the lateral wall of the 'immortomouse', showed expression of the same BM proteins as well as demonstrating the presence of markers specific to strial marginal cells, namely Na,K-ATPase α1 and β2 subunits. Thus, the cultured cells are identified as deriving from marginal cells of the stria vascularis. Moreover, these data suggest that a culture system using this marginal cell line will be useful to delineate mechanisms underlying the pathologic accumulation of extracellular matrix in the SCBM.
KW - Basement membrane
KW - Cell culture
KW - Cochlea
KW - Extracellular matrix
KW - Pathogenesis
KW - Stria vascularis
UR - http://www.scopus.com/inward/record.url?scp=0036154913&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036154913&partnerID=8YFLogxK
U2 - 10.1016/S0378-5955(01)00358-6
DO - 10.1016/S0378-5955(01)00358-6
M3 - Article
C2 - 11788196
AN - SCOPUS:0036154913
VL - 163
SP - 27
EP - 36
JO - Hearing Research
JF - Hearing Research
SN - 0378-5955
IS - 1-2
ER -