Showing papers by "Paolo Pani published in 1987"
TL;DR: Results indicate that unlike compensatory cell proliferation such as that induced by PH or CCl4, mitogen-induced cell proliferation did not result in any initiated hepatocytes despite the fact that in both types of models the extent of liver cell proliferation at the time of the administration of the carcinogen is similar.
Abstract: Experiments were designed to determine whether mitogen-induced cell proliferation is as effective as regenerative cell proliferation in achieving initiation of liver carcinogenesis. To test this hypothesis male Wistar rats were injected with a single dose of diethylnitrosamine (DENA) or N-methyl-N-nitrosourea (MNU) during the peak of DNA synthesis following the administration of the liver mitogen, lead nitrate, after partial hepatectomy (PH) or a necrogenic dose of CCl4. The initiated hepatocytes were monitored as gamma-glutamyltransferase (GGT)-positive foci using a 2-week selection regimen consisting of 0.03% 2-acetylaminofluorene (2-AAF) coupled with a necrogenic dose of CCl4. The results indicate that unlike compensatory cell proliferation such as that induced by PH or CCl4, mitogen-induced cell proliferation did not result in any initiated hepatocytes despite the fact that in both types of models the extent of liver cell proliferation at the time of the administration of the carcinogen is similar.
36 citations
TL;DR: Findings indicate that enhancement of cholesterol synthesis and of the HMP shunt is closely associated with the active proliferative process induced in the kidney by treatment with lead nitrate.
14 citations
TL;DR: The results indeed indicate that changes in HMP-shunt and cholesterol metabolism occur at a very early stage during the process of normal as well as preneoplastic cell growth.
Abstract: Previous studies from our laboratories have shown a stimulation of HMP-shunt, cholesterol metabolism and DNA synthesis during cell proliferation. In order to understand the co-ordinated regulation of these pathways during cell growth, the above metabolic pathways were studied in: 1) liver regeneration after partial hepatectomy, 2) lead-induced liver hyperplasia, 3) liver cell proliferation induced by insulin in streptozotocin-diabetic rats, 4) liver cell proliferation in fasted rats after refeeding and, 5) hepatocyte nodules induced by a selection procedure. The results indeed indicate that changes in HMP-shunt and cholesterol metabolism occur at a very early stage during the process of normal as well as preneoplastic cell growth. The coordinated regulation between cell growth and changes in these metabolic pathways needs further study.
8 citations
TL;DR: The results indicate that while DENA administration during compensatory cell proliferation results in the formation of GT positive foci, no enzyme-altered foci were produced when the carcinogen was given during liver hyperplasia induced by EDB, despite the fact that at the time of carcinogen administration, the extent of cell proliferation was the same in both the groups.
4 citations