Biochemical and morphological analysis of basement membrane component expression in corneoscleral and cribriform human trabecular meshwork cells

Investigative Ophthalmology & Visual Science
Rudolf FuchshoferMarco Birke

Abstract

To determine whether cells of the cribriform trabecular meshwork (TM) express basement membrane (BM) components similar to corneoscleral TM cells and to determine whether cribriform cells are connected to the elastic tendon net of the TM. TM cells of the corneoscleral and the cribriform regions were cultured from 10 eyes of 10 donors, aged 20 to 87 years. Cell types were classified by alpha-smooth muscle actin (smA), desmin, and alphaB-crystallin staining. Expression of collagen type IV (ColIV) chains alpha1 to 6; collagen type VIII (ColVIII) alpha1; laminin subunits alpha1 to 5, beta1 to 3, and gamma1 to 3; and nidogen 1 and 2 was tested in both cell types by semiquantitative RT-PCR (sqPCR). Expression of ColIValpha2, ColVIIIalpha1, laminin beta2, and nidogen 1 was quantified by Northern blot analysis. The response to transforming growth factor (TGF)-beta2 treatment was investigated. Serial tangential and sagittal TM sections of 16 eyes from 10 donors (aged 12-90 years) were used for electron- and immunoelectron microscopy. Both TM cell types expressed ColIV chains alpha1, alpha2, alpha4, alpha5, and alpha6; ColVIII alpha1; laminin subunits alpha3, alpha4, beta1, beta2, beta3, gamma1, and gamma2; and nidogen 1, as determined b...Continue Reading

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