Fasting during promotion, but not during initiation, enhances the growth of methylnitrosourea-induced mammary tumours |
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Authors: | Tessitore L; Chiara M; Sesca E; Premoselli F; Binasco V; Dianzani MU |
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Institution: | Dipartimento di Scienze Cliniche e Biologiche, Universita degli Studi di Torino, Ospedale S. Luigi Gonzaga, Regione Gonzole, Italy. |
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Abstract: | The purpose of this work was to investigate the effect of fasting on the
induction and growth of chemically-induced mammary carcinogenesis. Female
Sprague-Dawley rats were given methylnitrosourea (MNU) i.p. (50 mg/kg) at
50 days of age; a group of rats were exposed to 4 day fasting followed by 1
day of refeeding before the administration of the carcinogen, while another
group was exposed to three cycles of 3 days fasting in 10 days, beginning 1
week after MNU injection. Fasting enhanced the development of mammary
tumours only in rats fasted after carcinogen damage, while it did not
affect the induction of tumours in rats fasted before MNU, if compared with
full-fed controls. The enhanced growth of mammary tumours sustained by
fasting during promotion was observed in the cervical-thoracic region. In
addition, exposure to fasting made rats susceptible to the development of
MNU- induced extra-mammary cancers. Different from the preventive effect of
caloric restriction on tumor development, these data demonstrate that
fasting affects the promotion phase of carcinogenesis by enhancing the
growth of MNU-induced mammary tumours.
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