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Molecular Endocrinology Vol. 6, No. 3 485-497
doi:10.1210/me.6.3.485
Copyright © 1992 by the Endocrine Society.
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Molecular Endocrinology, Vol 6, 485-497, Copyright © 1992 by Endocrine Society

ARTICLES

Distribution and regulation of the prohormone convertases PC1 and PC2 in the rat pituitary

R Day, MK Schafer, SJ Watson, M Chretien and NG Seidah
J. A DeSeve Laboratory of Biochemical Neuroendocrinology, Clinical Research Institute of Montreal, Quebec, Canada.

PC1 and PC2 are enzymes involved in the activation of prohormones via the cleavage of pairs of basic amino acids. The expression levels of each of these enzymes were evaluated in the rat anterior and neurointermediate pituitary lobes by in situ hybridization and Northern gel analysis and after various pharmacological manipulations. All intermediate lobe melanotrophs expressed high levels of PC2 mRNA and lower levels of PC1 mRNA. PC1 mRNA was highly expressed throughout the anterior lobe; however, appreciable PC2 mRNA levels were also found. Based on colocalization studies, anterior lobe corticotrophs were found to express PC1 mRNA, but very little PC2 mRNA. Neurointermediate lobe levels of PC1, PC2, and POMC mRNA increased 2- to 6-fold in rats treated with haloperidol, while they decreased to 10-25% of their control values after bromocriptine treatment. These results indicate that in the intermediate lobe, dopamine is involved in the regulation of PC1 and PC2. In the anterior lobe, haloperidol had a strong effect on PC2 mRNA, increasing its levels by 8- to 12-fold compared to the control value, while PC1 mRNA was unaffected. Both PC1 and PC2 mRNA levels were increased 5- to 9-fold in animals made hypothyroid by treatment with 6-n-propyl-2-thiouracil. Adrenalectomy had no significant effect on anterior lobe PC1 mRNA levels. However, both PC1 and PC2 mRNA levels were responsive to dexamethasone treatment in the AtT-20 cell lines. Our results indicate that dopamine, thyroid hormones, and corticosteroids are involved in PC1 and/or PC2 gene expression. These data are also consistent with the role of PC1 and PC2 as prohormone-processing enzymes.


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