›› 2012, Vol. 55 ›› Issue (9): 1031-1036.doi:

• 研究论文 • 上一篇    下一篇

低温冷藏提高家蚕滞育卵NAD含量和胞质苹果酸脱氢酶活性

王启龙, 万华星, 姚金美, 司马杨虎, 赵林川   

  • 收稿日期:2012-08-15 修回日期:2012-09-18 出版日期:2012-09-20 发布日期:2012-09-20
  • 通讯作者: 赵林川 E-mail:sdzlc2008@163.com
  • 作者简介:王启龙, 男, 1989年7月生, 山东烟台人, 硕士研究生, 主要从事自由基生物学研究, E-mail: wqlong0605@126.com

Chilling enhances the NAD levels and cytosolic malate dehydrogenase activity in diapause eggs of the silkworm, Bombyx mori

WANG Qi-Long, WAN Hua-Xing, YAO Jin-Mei, SI Ma-Yang-Hu, ZHAO Lin-Chuan   

  • Received:2012-08-15 Revised:2012-09-18 Online:2012-09-20 Published:2012-09-20
  • Contact: ZHAO Lin-Chuan E-mail:sdzlc2008@163.com
  • About author:wqlong0605@126.com

摘要: 为了调查5℃低温处理是否改变家蚕Bombyx mori卵滞育NAD代谢, 本研究利用HPLC和分光光度法测定了经25℃和5℃分别处理的滞育卵中NADH 含量、 NAD+含量、 乳酸脱氢酶(LDH)活性和胞质苹果酸脱氢酶(cMDH)活性。结果表明: 5℃处理的NAD(NADH + NAD+)含量和cMDH活性分别增加了106%和53%, 并且显著高于25℃处理(P< 0.01); 但是两种处理的NADH/NAD+比值和LDH活性没有显著差异(P> 0.05)。据此推测, 5℃低温处理加强了家蚕滞育卵NAD+合成和再生能力。

关键词: 家蚕, 滞育解除, 辅酶NAD, 乳酸脱氢酶, 胞质苹果酸脱氢酶

Abstract: To investigate whether chilling at 5℃ changes the metabolism of NAD in diapause eggs of the silkworm, Bombyx mori, the levels of NADH and NAD+ along with the activities of lactate dehydrogenase (LDH) and cytosolic malate dehydrogenase (cMDH) in diapause eggs incubated at 25℃ and 5℃, respectively, were determined using HPLC and spectrophotometric methods. NAD (NADH + NAD+) levels and the cMDH activity in diapause eggs incubated at 5℃ increased by 106% and 53%, respectively, which were significantly higher than those in diapause eggs incubated at 25℃ (P<0.01). However, no significant difference in the NADH/NAD+ ratio and the LDH activity was observed between the incubation treatments at 25℃ and 5℃ (P>0.05). It is so inferred that the ability for NAD+ synthesis and regeneration in Bombyx diapause eggs is enhanced by chilling.

Key words: Bombyx mori, diapause termination, nicotinamide adenine dinucleotide, lactate dehydrogenase, cytosolic malate dehydrogenase