INVESTIGADORES
BARBEITO Claudio Gustavo
artículos
Título:
Daily variations in the duodenal crypts colchicine induced apoptosis
Autor/es:
GONZÁLEZ NV; BADRÁN AF; BARBEITO CG
Revista:
CHRONOBIOLOGY INTERNATIONAL
Editorial:
Taylor & Francis
Referencias:
Lugar: Londres; Año: 2005 vol. 22 p. 79 - 88
ISSN:
0742-0528
Resumen:
Apoptotic cell death can be induced by several agents, among them colchicine?a microtubule
disrupting-drug that affects continuously renewing cell populations, such as the intestinal crypt
enterocytes. The objectives of this investigation were (1) to confirm in vivo colchicines-inductive
effect and (2) to determine the existence of 24 h variations in the crypt enterocytes apoptotic
indices. The study was done on C3H/S male adult mice housed under standardized conditions.
Starting at midnight until the end of a circadian period, subgroups of mice were sacrificed
after having been injected with colchicine or saline i.p. 4h beforehand. Duodenal samples were
processed for hematoxylin-eosin staining and TUNEL technique. In order to score the number
of apoptosis, the longitudinal sections of the crypts were divided into three regions comprised,
respectively, of tiers 1?4, 5?12, and 13?20, proceeding from the bottom to the top of the
crypt. Values of each lot were expressed as mean+SEM. A highly significant statistical difference
in apoptotic indices was found for colchicine-treated animals. The 24 h curve for colchicineinduced
apoptosis displayed qualitative and quantitative differences compared to other inducer
agents. Highest apoptotic indices were found in the deepest crypt regions. Daily variations were
observed in all the crypt sectors of the colchicine-treated animals and in tiers 5?12 of the
saline controls. The present work demonstrates that the colchicine cytotoxicity is due to its apoptoticinducing
effect depends on the dosing time during the 24 h in this mouse strain