妇产科

人类射出精子的组蛋白甲基化和乙酰化

作者:高翠歌 编译 来源:医学论坛网 日期:2015-11-01
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         人类射出精子的组蛋白甲基化和乙酰化

Histone methylation and acetylation in ejaculated human sperm: effects of swim-up and smoking

Seul Ki Kim, M.D., Byung Chul Jee, M.D., Ph.D.correspondenceemail, Seok Hyun Kim, M.D., Ph.D.

Objective

To assess global methylation and acetylation level before and after swim-up in ejaculated human sperm.

 

Design

Prospective experimental study.

 

Setting

University-based hospital.

 

Patient(s)

Semen samples were obtained from 50 healthy volunteers (single sample per person) between December 2012 and May 2014.

 

Intervention(s)

The semen samples were processed by the swim-up method.

 

Main Outcome Measure(s)

Sperm motility, strict morphology, DNA fragmentation index (DFI) by TUNEL, abnormal chromatin structure by toluidine blue staining, immunostaining of 8-hydroxy-2′-deoxyguanosine (8-OHdG) as an oxidative stress marker, immunostaining of 5-methyl-cytosine (5-mC) as a measurement of methylation level and immunostaining of six acetylation markers (H3K9ac, H3K14ac, H4K5ac, H4K8ac, H4K12ac, and H4K16ac) before and after swim-up.

 

Result(s)

After swim-up, motility and the percentage of normal form was significantly elevated. In the swim-up fraction, DFI and the percentage of abnormal chromatin structure were significantly lower and 8-OHdG levels were significantly higher. The 5-mC levels were significantly lower in the swim-up fraction, whereas no changes were observed in the positivity of six acetylation markers. Elevated percentage of normal form and decreased DFI and 5-mC levels were observed only in nonsmokers; 8-OHdG level was significantly higher in the swim-up fraction only from smokers. After swim-up, 5-mC levels were positively correlated with DFI.

 

Conclusion(s)

This is the first study demonstrating decreased methylation and unchanged acetylation patterns in human sperm after swim-up preparation.

Fertility and Sterility

June 2015Volume 103, Issue 6, Pages 1425–1431

 

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