Summary
Human pituitary adenomas proliferate neither in cell culture nor in athymic “nude” mice. We propose that one or several of the humoral factors necessary for the growth of pituitary adenomas is missing in these experimental environments. The purpose of our experiments was to examine the possible influence of the hypothalamus in supporting cellular proliferation, and thus adenoma growth. Fragments from four human pituitary adenomas (three pituitary prolactinomas; one ACTH-secreting adenoma) were transplanted into the pituitary fossa of total-body irradiated, hypophysectomized rats. The rats were killed after two weeks and perfused with a mixture of formalin and India ink. Histologic examination of serial sagittal sections through the pituitary fossa and the adjacent brain showed: vascularization of the grafts from the pituitary stalk and from the scar tissue in the sphenoid bone; survival of some adenomas; and numerous mitoses in an ACTH-secreting specimen obtained from a patient who had Cushing's disease. We conclude from these experiments that as yet unidentified hypothalamic factors are essential for the growth of certain types of pituitary adenomas.
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This study was supported by a grant to Dr. Landolt from the Jubiläumsspende of the University of Zürich, Switzerland.
The results were presented in part at the Second European Workshop on Pituitary Adenomas, Paris, September 20–22, 1979
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Landolt, A.M., Barker, M., Deen, D.F. et al. Subhypothalamic grafts of human pituitary adenomas in total-body irradiated rats. Cell Tissue Res. 221, 269–277 (1981). https://doi.org/10.1007/BF00216731
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DOI: https://doi.org/10.1007/BF00216731