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1993 ; 84
(7
): 734-41
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Long-term preservation of renin-secreting ability by human adult juxtaglomerular
tumor cells in explant culture
#MMPMID8370649
Armato U
; D'Agostino D
; Romano F
; Salvetti A
; Mantero F
Jpn J Cancer Res
1993[Jul]; 84
(7
): 734-41
PMID8370649
show ga
Studies on cultured human renin(R)-producing tumors cells are few. In this work
the R secretion by a human juxtaglomerular tumor (JGT) in various tissue culture
models was evaluated by a new immunoradiometric assay. Freshly isolated JGT cells
actively secreted total R (tR; about 70% of which is proR) into the perfusion
media of very short-term cultures (tR concentration, 100-400 ng/ml/10(6) cells),
independently of factors stimulating or inhibiting R output by normal JG cells.
Primary monolayer cultures of the same JGT rapidly lost their tR-secreting
capability and died by apoptosis within two months. Conversely, a JGT explant
survived for up to 22 months in vitro. During the first year of culture, this
explant increased in volume and generated, at 3- to 4-monthly intervals, several
self-limited cellular outgrowths, from which it became detached. Meanwhile, tR
secretion by the explant decreased very slowly, though its decline was
transiently and partly reversed by various combinations of growth factors,
hormones, a prostaglandin, and selenous acid added to either a serum-enriched or
a synthetic medium. By the 12th month in vitro, tR secretion had faded away. Like
the primary monolayers, the various explant outgrowths, once detached, stopped
secreting tR and died in a few weeks. Hence, the preservation of a histiotypic
relationship and the actions of several mitogenic and/or differentiating agents
are essential for the long-term survival and the continuance of R secretion by
human JGT cells in vitro.