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To elucidate whether anterior pituitary cells express the nitric oxide (NO) synthase gene, we studied the synthesis of NO and the expression of NO synthase (NOS) mRNA by a mouse pituitary tumour cell line (AtT20/D16). Interleukin-1β (IL-1β) stimulated production of NO₂^–/NO₃^– (NOx) in a time-dependent manner and both NOx and cyclic GMP formation were stimulated in a dose-dependent manner by IL-1β. IL-1β-induced NOx production and intracellular cyclic GMP formation were similarly blocked by an NO synthase inhibitor, N^G-monomethyl-L-arginine (LNMMA), whose effect was reversed by L-arginine, but not by D-arginine. Dexamethasone inhibited IL-1β-induced NOx production in a dose-dependent manner. A calmodulin inhibitor (W-7) showed no effect on IL-1β-induced NOx production, whereas cycloheximide and the actinomycin D completely inhibited NOx production. Northern blot analysis using cDNA for mouse macrophage-inducible NOS as a probe revealed the expression of inducible NOS mRNA in the cells only after exposure to IL-1β. Although IL-1β stimulated ACTH release from tumour cells, LNMMA failed to affect ACTH release stimulated by IL-1β. These results demonstrate for the first time that a pituitary tumour cell line (AtT20/D16) possesses cytokine-inducible and Ca²⁺/calmodulin-independent NOS, although NO may not be involved in ACTH release.

Journal of Endocrinology (1993) 138, 429–435

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