The adenohypophysis of catfish and
other teleosts consists of morphologically
and functionally different cell types.
Hormone synthesis and release in some of
these cell types are controlled by similar
hypothalamic peptidergic and aminergic
systems. In vivo also blood-born steroids
may directly and/or indirectly influence
the activity of for example corticotropic
and gonadotropic pituitary cells. Moreover,
different adenohypophyseal cell
types tend to influence each other via
their respective hormones, both under in
vivo and in vitro conditions. Consequently,
to study the effect of each single
control mechanism on hormone synthesis and
release by a single cell type, it is necessary
to use isolated cells. Confirmation of the identity of the
isolated cell type is an important step in
the procedure. The present study describes
an ultrastructural method to confirm the
isolation of gonadotropic cells from the
pituitary of the African catfish, Clarias
lasera
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