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Departments of Surgery (M.A.Z., M.S., Y.G., Y.T., W.C.D.), Pathology (W.H.W.), and Medicine (M.A.L.), Johns Hopkins Medical Institutions, Baltimore, Maryland 21205; National Institute of Diabetes, Digestive, and Kidney Diseases (L.D.K.), National Institutes of Health, Bethesda, Maryland 20892
Address all correspondence and requests for reprints to: Martha A. Zeiger, M.D., F.A.C.S., 600 North Wolfe Street, Carnegie 681, Department of Surgery, Division of Surgical Oncology and Endocrine Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland 21287-8611.
Thyroid cell growth and function are regulated by hormones and growth
factors binding to cell surface receptors that are coupled via G
proteins, Gs and Gq, to the adenylyl cyclase and phospholipase C signal
transduction systems, respectively. Activating mutations of the TSH
receptor and G
s have been documented in subsets of thyroid
neoplasms. To test the oncogenic potential of activated G
s in
transgenic mice, we used the cholera toxin A1 subunit that
constitutively activates G
s and used the rat thyroglobulin gene
promoter for targeting this transgene (TGCT) to thyroid follicular
cells. Three (M1392, F1358, and F1286) of six founders identified were
able to transmit the transgene to their offspring and thyroid glands
from these mice contained elevated levels of cAMP. Concentrations of
serum thyroxine were elevated as early as 2 months of age (M 1392 and F
1286). F1358 mice were euthyroid until 8 months of age, at which time
they developed hyperthyroidism. All three TGCT lines developed thyroid
hyperplasia independent of their thyroxine levels. DNA image analysis
of thyroid follicular cells from both the hyper and euthyroid mice
showed that DNA index and "S+G2/M" phase were increased compared
with normal, changes similar to that seen in poor prognosis human
carcinomas. These data suggest that the G
s-adenylyl cyclase-cAMP
pathway has an important role in thyroid hyperplasia and the transgenic
mouse models reported herein will allow further examination of the role
of this pathway in thyroid oncogenesis.
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