News | New Scientific Finding: How Does the AKG/OXGR1 Signaling Pathway Affect Male Fertility?
Male fertility is influenced by factors including genetic defects, lifestyle, nutrition, and changes in local metabolism and the reproductive microenvironment. After sperm form in the testicles, they enter the epididymis and undergo structural, biochemical, and functional changes before becoming mature and capable of fertilization. Aging, stress, and local metabolic factors can substantially affect how the epididymis regulates sperm maturation and therefore influence male fertility.
New Study Identifies the Role of AKG/OXGR1 Signaling in Male Fertility
On July 15, 2022, Professors Shuang Gang and Jiang Qingyan of South China Agricultural University published a study in Life Metabolism titled “Smooth muscle AKG/OXGR1 signaling regulates epididymal fluid acid-base balance and sperm maturation.” The study was the first to identify an important role for the alpha-ketoglutarate (AKG)/oxoglutarate receptor 1 (OXGR1) signaling pathway in maintaining male fertility.
OXGR1 was mainly expressed in epididymal smooth muscle cells, and its levels declined with aging and heat stress. Using OXGR1-knockout mice, including systemic and epididymis-specific knockouts, the researchers found that OXGR1 plays a critical role in sperm maturation by regulating the acid-base balance of epididymal fluid. AKG supplementation also improved impaired sperm maturation caused by aging and heat stress, suggesting a potential strategy for declining male fertility.
How Might AKG Supplementation Improve Sperm Quality?
OXGR1 is an endogenous receptor for AKG, a key metabolic intermediate in the tricarboxylic acid (TCA) cycle. Previous research found high OXGR1 expression in the testicles, but its cellular distribution and biological function in the male reproductive system were not fully understood. Investigating its role therefore has potential clinical and practical value.
As an endogenous OXGR1 agonist, AKG has demonstrated regulatory roles in areas including longevity, intestinal health, obesity risk, and immune-cell activation. In this study, adding 2% AKG to drinking water significantly reduced abnormal epididymal sperm morphology in aging mice and increased sperm capacitation and acrosome reaction rates. Similar improvements occurred in heat-stressed mice, although AKG did not effectively reverse the reduction in sperm capacitation caused by heat stress.
Study Finding: Epididymal Smooth Muscle Regulates the Reproductive Microenvironment
The study was the first to show that epididymal smooth muscle can regulate the acid-base balance of the local microenvironment through AKG/OXGR1 signaling and promote sperm maturation, identifying a new role for smooth muscle cells in male reproductive health. It also demonstrated the pathway's potential to reverse declines in male fertility caused by aging and heat stress, providing evidence for future interventions for male infertility.
Future Outlook: AKG as a Potential Strategy for Improving Male Fertility
The findings deepen understanding of metabolic regulation in the male reproductive system and offer a direction for fertility research based on metabolic regulation. As male infertility rates rise globally, improving sperm quality through evidence-based interventions is an important topic in reproductive medicine.
Future research may examine:
How does AKG precisely regulate OXGR1 expression?
Do different doses of AKG have different effects on sperm quality?
How could AKG supplementation be applied clinically to improve male fertility?
Further research may provide clearer directions for developing male infertility treatments based on metabolic regulation.
News | New Scientific Finding: How Does the AKG/OXGR1 Signaling Pathway Affect Male Fertility?
News | New Scientific Finding: How Does the AKG/OXGR1 Signaling Pathway Affect Male Fertility?
Male fertility is influenced by factors including genetic defects, lifestyle, nutrition, and changes in local metabolism and the reproductive microenvironment. After sperm form in the testicles, they enter the epididymis and undergo structural, biochemical, and functional changes before becoming mature and capable of fertilization. Aging, stress, and local metabolic factors can substantially affect how the epididymis regulates sperm maturation and therefore influence male fertility.
New Study Identifies the Role of AKG/OXGR1 Signaling in Male Fertility
On July 15, 2022, Professors Shuang Gang and Jiang Qingyan of South China Agricultural University published a study in Life Metabolism titled “Smooth muscle AKG/OXGR1 signaling regulates epididymal fluid acid-base balance and sperm maturation.” The study was the first to identify an important role for the alpha-ketoglutarate (AKG)/oxoglutarate receptor 1 (OXGR1) signaling pathway in maintaining male fertility.
OXGR1 was mainly expressed in epididymal smooth muscle cells, and its levels declined with aging and heat stress. Using OXGR1-knockout mice, including systemic and epididymis-specific knockouts, the researchers found that OXGR1 plays a critical role in sperm maturation by regulating the acid-base balance of epididymal fluid. AKG supplementation also improved impaired sperm maturation caused by aging and heat stress, suggesting a potential strategy for declining male fertility.
How Might AKG Supplementation Improve Sperm Quality?
OXGR1 is an endogenous receptor for AKG, a key metabolic intermediate in the tricarboxylic acid (TCA) cycle. Previous research found high OXGR1 expression in the testicles, but its cellular distribution and biological function in the male reproductive system were not fully understood. Investigating its role therefore has potential clinical and practical value.
As an endogenous OXGR1 agonist, AKG has demonstrated regulatory roles in areas including longevity, intestinal health, obesity risk, and immune-cell activation. In this study, adding 2% AKG to drinking water significantly reduced abnormal epididymal sperm morphology in aging mice and increased sperm capacitation and acrosome reaction rates. Similar improvements occurred in heat-stressed mice, although AKG did not effectively reverse the reduction in sperm capacitation caused by heat stress.
Study Finding: Epididymal Smooth Muscle Regulates the Reproductive Microenvironment
The study was the first to show that epididymal smooth muscle can regulate the acid-base balance of the local microenvironment through AKG/OXGR1 signaling and promote sperm maturation, identifying a new role for smooth muscle cells in male reproductive health. It also demonstrated the pathway's potential to reverse declines in male fertility caused by aging and heat stress, providing evidence for future interventions for male infertility.
Future Outlook: AKG as a Potential Strategy for Improving Male Fertility
The findings deepen understanding of metabolic regulation in the male reproductive system and offer a direction for fertility research based on metabolic regulation. As male infertility rates rise globally, improving sperm quality through evidence-based interventions is an important topic in reproductive medicine.
Future research may examine:
How does AKG precisely regulate OXGR1 expression?
Do different doses of AKG have different effects on sperm quality?
How could AKG supplementation be applied clinically to improve male fertility?
Further research may provide clearer directions for developing male infertility treatments based on metabolic regulation.
Story source:
Collected online