SciELO - Scientific Electronic Library Online

 
vol.48 número6Dried brewers' grain as a replacement for soybean meal on nutrient digestibility and rumen parameters of cattleEffect of quercetin supplementation on the growth, feed efficiency and serum hormone levels of New Zealand White rabbits índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Artigo

Indicadores

Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Em processo de indexaçãoSimilares em Google

Compartilhar


South African Journal of Animal Science

versão On-line ISSN 2221-4062
versão impressa ISSN 0375-1589

Resumo

GUO, Q. et al. Weaning-induced cell cycle arrest through up-regulation of p21 and p27 in the jejunum of piglets. S. Afr. j. anim. sci. [online]. 2018, vol.48, n.6, pp.1099-1109. ISSN 2221-4062.  http://dx.doi.org/10.4314/sajas.v48i6.13.

This study was aimed at investigating the effects of weaning on jejunal redox status, morphology and expression of cell cycle regulators in piglets. A total of 120 new-born piglets from 12 litters were divided into two groups: the control (suckled normally) and weaning group (weaned at day 21). Six piglets from each group were slaughtered at day 22, day 25 and day 28. Results showed that weaning increased the serum hydrogen peroxide (H2O2) and malondialdehyde (MDA), decreased inhibitory hydroxyl radical (IHR) concentrations and superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) activities at day 25. Furthermore, the jejunal nitric oxide (NO) level was increased at days 22 and 28, while H2O2 concentrationwas increased at days 22, 25 and 28. Results of jejunum morphology showed weaning decreased villous height and width, and increased crypt depth at day 25. Relative mRNA and protein expression showed that Smad4 was decreased at day 25 and then increased at day 28. The expression of p21 and p27 were significantly increased by weaning at days 25 and 28, but cyclin D and cyclin E showed no significant differences compared with control group. In conclusion, weaning increased the serum and jejunal reactive oxygen species (ROS) production, inhibited jejunum development and cell cycle progression through down-regulation of Smad4 and up-regulation of p21 and p27 of piglets, which further explained weaning-induced stress syndrome.

Palavras-chave : Proliferation; intestine; reactive oxygen species; weaning.

        · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons