Scientists at the University of California, Los Angeles found that bacteria in the sperm microbiome, such as Lactobacillus iners, affect sperm motility. Research results published In the journal Scientific Reports.
In laboratory studies conducted on sperm samples, scientists found that a bacterium called Lactobacillus iners has a direct negative effect on male fertility. Researchers have found that men with higher amounts of these bacteria in their sperm microbiomes are more likely to have problems with sperm motility.
Sperm motility is one of the important indicators of fertility because it indicates the ability of germ cells to reach the target (egg) for fertilization. Previous studies have shown that Lactobacillus can produce L-lactic acid and potentially create a local pro-inflammatory environment that can negatively affect sperm motility.
Scientists also found that men with decreased sperm concentration in their semen were more likely to have increased numbers of microbes called Pseudomonas fluorescens and Pseudomonas stutzeri. They belong to the Pseudomonas group. However, it is noted that not all members of the same closely related group may affect fertility in the same way.
Specifically, all three bacterial species in the Pseudomonas group (Pseudomonas fluorescens, Pseudomonas stutzeri, and Pseudomonas putida) were present in men with both normal and abnormal sperm concentrations.
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Source: Gazeta
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