Rab3a and Rab27b Expression in Nonfunctioning Pituitary Adenomas
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概要
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Patients with nonfunctioning pituitary adenoma (NFPA) have normal circulating levels of anterior pituitary hormones. Here we examined the expression of exocytic trafficking regulators, Rab27b and Rab3a, in surgically resected pituitary adenoma tissues by immunohistochemical (IHC) analysis using anti-Rab27b and anti-Rab3a antibodies. Among the examined tissues, just over half of the null-cell adenomas and one-third of the gonadotropin-producing adenomas were immunonegative for both Rab27b and Rab3a. However, no Rab-negative samples were observed among the functioning adenomas. These results suggested that downregulated Rab protein expression in anterior pituitary endocrine cells could underlie, at least in part, the hormone-secretion defects of nonfunctioning adenoma cells. Rab27b, Rab3a, and their cellular regulators might therefore be promising pathological markers of patients with NFPA.
- 昭和大学学士会の論文
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