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1 Departamento de Biologia Celular, Embriologia e Genética, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Santa Catarina; and 2 Departamento de Anatomia, Instituto de Ciências Biomédicas, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, 21949 - 900 Rio de Janeiro, Rio de Janeiro, Brazil
In this study, the effect of
thyroid hormone (triiodothyronine, T3) on the secretion of
mitogenic growth factors in astrocytes and C6 glioma cells was
examined. The proliferating activity of T3 could be due, at
least in part, to the astrocyte secretion of acidic and basic
fibroblast growth factor (aFGF and bFGF), tumor necrosis factor-
,
and transforming growth factor-
. In contrast, the conditioned medium
(CM) of T3-treated C6 cells was mitogenic to this cell line
only after hyaluronidase digestion, suggesting the impairment of growth
factor mitogenic activity by hyaluronic acid. Furthermore, the presence
of bFGF was significantly greater in the CM of both
T3-treated astrocytes and T3-treated C6 cells
than in the corresponding control CM. These data show that
T3 induces cerebellar astrocytes to secrete mitogenic
growth factors, predominantly bFGF, that could influence astrocyte and neuronal proliferation via autocrine and paracrine pathways.
cell proliferation; cell differentiation; fibroblast growth factors; interleukin-3
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