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Recent decline in sperm motility among donor candidates at a sperm bank in Denmark.
Hum Reprod
August 2024
Department of Biology, Queen's University, Kingston, ON, Canada.
Study Question: Has there been variation in semen quality among men applying to be sperm donors (i.e. donor candidates) in Denmark in recent years (2017-2022)?
Summary Answer: The motile sperm concentration and total motile sperm count (TMSC) in ejaculates-both measures of sperm quality-declined by as much as 22% from 2019 to 2022.
Exposure to Fine Particulate Matter Constituents and Human Semen Quality Decline: A Multicenter Study.
Environ Sci Technol
September 2023
National Health Commission Key Laboratory of Male Reproduction and Genetics, Guangzhou 510600, China.
Exposure to fine particulate matter (PM < 2.5 μm in diameter [PM]) may accelerate human sperm quality decline, although research on this association is limited. Our objective was to investigate the relationship between exposure to the chemical constituents of PM air pollution and decreased sperm quality and to further explore the exposure-response relationship.
View Article and Find Full Text PDFLong-term storage modifies the microRNA expression profile of cryopreserved human semen.
Biomol Biomed
January 2024
Clinical Research Center for Reproduction and Genetics in Hunan Province, Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, Hunan, China; Institute of Reproductive and Stem Cell Engineering, Basic Medicine College, Central South University, Changsha, Hunan, China.
The global practice of cryopreservation of human semen is commonplace in Assisted Reproductive Technology (ART) labs and sperm banks. However, information on the effects of long-term cryopreservation on semen is limited to clinical data summaries and descriptions. For this study, we prepared 4 semen specimens of fresh semen, 4 specimens cryostored for at least 1 year, 3 specimens cryostored for at least 5 years, 4 specimens cryostored for at least 10 years, and 3 specimens cryostored for at least 15 years.
View Article and Find Full Text PDFDiurnal rhythm of human semen quality: analysis of large-scale human sperm bank data and timing-controlled laboratory study.
Hum Reprod
July 2022
Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University (Army Medical University), Chongqing, China.
Study Question: Can we identify diurnal oscillations in human semen parameters as well as peak times of semen quality?
Summary Answer: Human semen parameters show substantial diurnal oscillation, with most parameters reaching a peak between 1100 and 1500 h.
What Is Known Already: A circadian clock appears to regulate different physiological functions in various organs, but it remains controversial whether diurnal rhythms occur in human semen parameters.
Study Design, Size, Duration: The medical record of a provincial human sperm bank (HSB) with 33 430 semen samples collected between 0800 and 1700 h from 1 March 2010 to 8 July 2015 was used to analyze variation in semen parameters among time points.
The Protective Effects of Alpha Lipoic Acid on Human Sperm Function During Freezing-Thawing.
Cryo Letters
July 2021
Department of Animal Biotechnology, Reproductive Biomedicine Research Center, Royan Institute for Biotechnology, ACECR; Isfahan Fertility and Infertility Center, Isfahan, Iran. and
Background: Sperm cryopreservation is presently used for conservation of male gametes in assisted reproduction technologies (ART). Despite the benefits of sperm banking, freeze-thawing process is injurious to sperm integrity due to induced oxidative stress by cold stress. Oxidative stress reduces sperm motility, viability and DNA integrity.
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