Changes of biological clock protein in neonatal rats with hypoxic-ischemic brain damage

LI Yong-Fu; JIN Mei-Fang; SUN Bin; FENG Xing

doi:10.7499/j.issn.1008-8830.2013.01.016

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Chinese Journal of Contemporary Pediatrics ›› 2013, Vol. 15 ›› Issue (1) : 62-66. DOI: 10.7499/j.issn.1008-8830.2013.01.016

EXPERIMENTAL RESEARCH

Changes of biological clock protein in neonatal rats with hypoxic-ischemic brain damage

LI Yong-Fu, JIN Mei-Fang, SUN Bin, FENG Xing

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Abstract

OBJECTIVE: To study the effects of biological clock protein on circadian disorders in hypoxic-ischemic brain damage (HIBD) by examining levels of CLOCK and BMAL1 proteins in the pineal gland of neonatal rats. METHODS: Seventy-two 7-day-old Sprague-Dawley (SD) rats were randomly divided into sham-operated and HIBD groups. HIBD model was prepared according to the modified Levine method. Western blot analysis was used to measure the levels of CLOCK and BMAL1 in the pineal gland at 0, 2, 12, 24, 36 and 48 hours after operation. RESULTS: Both CLOCK and BMAL levels in the pineal gland increased significantly 48 hours after HIBD compared with the sham-operated group (P<0.05). There were no significant differences in levels of CLOCK and BMAL proteins between the two groups at 0, 2, 12, 24 and 36 hours after operation (P>0.05). CONCLUSIONS: Levels of CLOCK and BMAL1 proteins in the pineal gland of rats increase significantly 48 hours after HIBD, suggesting that both CLOCK and BMAL1 may be involved the regulatory mechanism of circadian disorders in rats with HIBD.

Key words

Hypoxic-ischemic brain damage / Pineal gland / Clock gene / BMAL1 / Neonatal rats

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LI Yong-Fu, JIN Mei-Fang, SUN Bin, FENG Xing. Changes of biological clock protein in neonatal rats with hypoxic-ischemic brain damage[J]. Chinese Journal of Contemporary Pediatrics. 2013, 15(1): 62-66 https://doi.org/10.7499/j.issn.1008-8830.2013.01.016

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