Abstract
Dynamins are GTPases which support receptor-mediated endocytosis and bind to several tyrosine kinase receptor-associated proteins known to mediate cell proliferation and differentiation. We have recently established that dynamin expression correlates with normal neuronal (Torre et al., J. Biol. Chem., 269 (1994) 32411-32417) and acinar pancreatic cell differentiation (Cook et al., Mol. Biol. Cell, 6 (1995) 405a). To begin to understand the role of dynamin in neoplastic pancreatic cell differentiation, we have followed the expression of this protein by immunohistochemistry during the development of pancreatic tumors in a mancozeb-nitrosomethylurea (NMU)-based carcinogenesis model recently developed in our laboratory (Monis and Valentich, Carcinogenesis, 14 (1993) 929-933). After a single intraperitoneal injection (50 mg/g body wt) of this carcinogen, rats fed with mancozeb develop pancreatic focal acinar hyperplasia (FACH), dysplastic foci (DYF) displaying acinar-like and ductular-like structures, and ductular-like carcinoma in situ (CIS). After histochemical staining using a monoclonal anti-dynamin antibody, high levels of this protein are consistently observed in well-differentiated acinar tumors (FACH). In contrast, dynamin i...Continue Reading
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