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1.
Acta Laboratorium Animalis Scientia Sinica ; (6): 557-561,566, 2015.
Article in Chinese | WPRIM | ID: wpr-603110

ABSTRACT

Objective To investigate the effects of down-regulation of Beclin 1, which is an autophagy regulatory molecule, expression induced by RNA interference on the proliferation and apoptosis in skin fibroblasts of naked mole rat. Methods The expression levels of Beclin 1 were detected after starvation or H2 O2 treatment.The fibroblasts were transi-ently transfected with specific siRNA targeting Beclin 1 and then screened by real-time PCR and Western blot.Cell prolifer-ation and apoptosis were determined using CCK-8 detection kit and flow cytometry ( FCM ) .The expressions of related genes were detected by Western blot.Results The expression of Beclin 1 gene at mRNA and protein levels was signifi-cantly lower in fibroblasts of the naked mole rat.Starvation and H2 O2 treatment induced changes of the Beclin 1 expression. Inhibition of Beclin 1 gene expression can inhibit cell proliferation and induce early and late apoptosis.The protein levels of p53, BAX, Bcl2, LC3B, p-AKT and mTOR were reduced after transient transfection with Beclin 1-siRNA.Conclusions The expression of Beclin 1 in fibroblasts of naked mole rat are changed in response to starvation or H2 O2 stimulation.Inhi-bition of Beclin 1 gene expression can inhibit cell proliferation and induce apoptosis.Therefore, Beclin1 gene may play a regulatory role in autophagy, proliferation and apoptosis in the skin fibroblasts of naked mole rat.

2.
Chinese Journal of Comparative Medicine ; (6): 61-66, 2014.
Article in Chinese | WPRIM | ID: wpr-457833

ABSTRACT

All organisms regulate their life activities through the biological clock, which makes a variety of activities regular.For example, many physiological activities such as sleep-wake cycle, temperature, heart rate, blood pressure, endocrine and metabolic activity of the kidney and liver are subject to the regulation of circadian rhythms, that is to say they are all under the control of circadian pacemaker.Physiological activity of cell cultured in vitro also possess rhythms.This paper conducts a brief overview of biological clock of cell cultured in vitro and analyzes the molecular mechanism of the biological clock of the neurons and peripheral tissue cell as well as the existing problems, which provide reference for comprehensive interpretation of the molecular mechanism of biological clock.

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