Abstract
The effects of transforming growth factor-beta1 (TGFbeta) on two human neuroblastoma cell lines, LAN-5 and SK-N-AS, and one human glioblastoma cell line, GL15, were evaluated. Of the three cultures, only two, SK-N-AS and GL15, had a complete response to TGFbeta, with induction of the following effects: (i) inhibition of cell proliferation; (ii) up-regulation of the extracellular matrix glycoprotein fibronectin, together with down-regulation of the VLA5 integrin receptor; (iii) up-regulation of histotype-specific cytoskeletal intermediate filaments (neurofilaments for neuroblastoma and GFAP for glioblastoma); and (iv) increase in the glycoprotein CD44, only in SK-N-AS. In the third cell line, neuroblastoma LAN-5, the effects exerted by TGFbeta consisted only of (i) neurofilament increase and (ii) morphological differentiation. The TGFbeta receptor pattern was different in each culture: SK-N-AS expressed low rates of type I and type II receptors and high rates of type III receptor; LAN-5 expressed high rates of type I, low rates of type II, and no type III; GL15 expressed high rates of all three receptors. These data suggest that TGFbeta can induce a histotype-specific cell maturation and that the neuroblastoma expressing low typ...Continue Reading
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