Increased tumor cell multiplication after radiofrequency lesions in median hypothalamus in the mouse and rat.

Abstract:

:A significant increase of cell multiplication in inoculated ascitic and solid tumors was demonstrated in both DBA/2 and C57BL/6 mice as well as in Wistar rats after radiofrequency lesions in the median hypothalamus (ventromedial and dorsomedial nuclei; part of arcuate nucleus). The following tests were performed: mitotic and metaphasic index, doubling time of tumor, incorporation of tritiated thymidine into DNA, cell cycle parameters and growth fraction. The increased rate of cell proliferation measured was predominantly due to the higher speed of DNA biosynthesis with a minor contribution by an increase of the growth fraction. In the animals with hypothalamic lesions we demonstrated a slight decrease in the secretory activity of the adenohypophysis. Because it is generally stated that failure of hypophysis function hinders cell multiplication in normal and neoplastic tissues, we think that heightened cell proliferation after hypothalamic lesions is due to suppression of an inhibitory mechanism located in the hypothalamus and which is independent of the hypophysis.

journal_name

Neuroendocrinology

journal_title

Neuroendocrinology

authors

Bindoni M,Belluardo N,Marchese AE,Cardile V,Mudò G,Cella S,Laguidara A,Denatale G

doi

10.1159/000124479

subject

Has Abstract

pub_date

1986-01-01 00:00:00

pages

407-15

issue

5

eissn

0028-3835

issn

1423-0194

journal_volume

42

pub_type

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