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Nicotine elevates sperm motility and induces Pfn1 promoter hypomethylation in mouse testis
1School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China.
Abstract:
Many studies have addressed the hazardous role of cigarette smoking on male fertility, but the exact molecular mechanisms involved in the impairments caused by nicotine remain unclear. To evaluate the detrimental effects of nicotine exposure on spermatogenesis, two-dimensional gel electrophoresis and mass spectrometry analysis were performed to screen and identify differentially expressed proteins from the testes of mice exposed to nicotine daily. Data mining analysis indicated that the 15 identified proteins were mainly involved in actin cytoskeleton regulation and in the tricarboxylic acid cycle, which are related to cell motility. Further investigation of a central regulatory factor in the cytoskeleton regulation, profilin 1 (PFN1), revealed that nicotine-induced Pfn1 over-expression in mouse testes, specifically in elongated spermatids, by Pfn1 promoter hypomethylation. Interestingly, elevated sperm motility parameters were observed in nicotine-treated mice. We assume that nicotine-induced PFN1 over-expression in mouse spermatids may promote actin polymerization and ultimately enhance sperm motility.
Insights
Nicotine exposure in mice increases profilin 1 (PFN1) in testes, enhancing sperm motility. This study clarifies molecular mechanisms behind nicotine
Area of Science:
- Reproductive biology
- Molecular toxicology
- Spermatogenesis research
Background:
- Cigarette smoking's adverse effects on male fertility are known.
- The precise molecular impacts of nicotine on male reproductive health remain incompletely understood.
Purpose of the Study:
- To investigate the molecular mechanisms by which nicotine exposure affects spermatogenesis and male fertility.
- To identify key proteins and pathways impacted by nicotine in the testes.
Main Methods:
- Utilized two-dimensional gel electrophoresis and mass spectrometry to analyze protein expression in mouse testes following daily nicotine exposure.
- Conducted data mining to identify differentially expressed proteins.
- Investigated the expression and methylation status of profilin 1 (PFN1).
Main Results:
- Identified 15 differentially expressed proteins, primarily involved in actin cytoskeleton regulation and the tricarboxylic acid cycle.
- Found that nicotine exposure led to increased PFN1 expression in mouse testes, specifically in elongated spermatids, due to PFN1 promoter hypomethylation.
- Observed enhanced sperm motility parameters in nicotine-treated mice.
Conclusions:
- Nicotine exposure induces PFN1 overexpression in mouse spermatids via promoter hypomethylation.
- This PFN1 overexpression likely enhances actin polymerization, leading to improved sperm motility.
- The findings provide novel insights into the molecular basis of nicotine's effects on male fertility.
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