Sperm finding could improve fertility, contraceptives

(Medical Xpress)—A new study headed up by Cornell scientists has found that a component of the sperm membrane tightly controls a crucial step in fertilization, making it a prime target for efforts to either assist fertilization or prevent it. That's good news for both fertility efforts and contraceptive development, according to lead author Dr. Alexander Travis, associate professor of reproductive biology at Cornell's Baker Institute for Animal Health and the College of Veterinary Medicine. He and his colleagues report in the journalDevelopmental Cell that as a sperm approaches an egg, GM1 in the sperm membrane controls the opening and closing of a specific calcium channel on the surface of the sperm head, allowing a small amount of calcium into the sperm.

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The researchers report that this tiny movement of calcium must be completed in order for the sperm to release the enzymes that help it pass through the egg's thick outer coating. The release process, called acrosome exocytosis, is an irreversible step toward fertilization. "By defining how GM1 regulates this calcium channel, we can now look for compounds that block or mimic that interaction," said Travis, who also is faculty director for the environment at Cornell's Atkinson Center for a Sustainable Future. "It potentially gives you a new approach for a spermicide," he added. The only spermicide that's commercially available is detergent-based, a formulation that makes certain users more susceptible to sexually transmitted diseases.

A new approach could work without detergents, he says, mimicking GM1's effect on sperm and triggering them to burst open and die long before they reach an egg. On the other hand, he said, the information might help guide the development of new cryopreservatives for use in fertility treatments in humans, livestock or endangered species. Some current cryopreservative formulations contain mixtures of lipids, including GM1, an ingredient that may trigger premature acrosome exocytosis and actually reduce the length of time sperm can survive after thawing, Travis said.

Meanwhile, an immediate application for GM1 is male fertility testing. Since the presence and location of GM1 in the sperm membrane must be finely tuned to accomplish fertilization, defects in these aspects can adversely affect sperm function, making GM1 a potentially useful biomarker for male fertility, said Travis. A company that Travis co-founded, Androvia Inc., has developed an assay of male fertility that's currently in clinical trials. The findings may also provide answers to other health-related questions, Travis added.

The particular calcium channels that are active in sperm and regulated by GM1 are also found in other parts of the body, and Travis says his lab will now explore whether the GM1-calcium channel interaction they've identified in sperm also holds true in those organs.

Frequently Asked Questions

What is the new sperm discovery and how could it help couples trying to conceive?

Scientists have discovered that a component called GM1 in the sperm membrane controls a crucial calcium channel that allows sperm to release enzymes needed to penetrate the egg. This breakthrough could lead to new fertility treatments that help sperm function more effectively, potentially offering hope to the 1 in 7 UK couples who experience fertility issues.

Could this research lead to new fertility treatments available on the NHS?

While this research is still in its early stages, it could eventually inform new assisted reproduction techniques. Any new treatments would need to undergo rigorous clinical trials and NICE approval before becoming available through NHS fertility services or licensed HFEA clinics in the UK.

How might this sperm research improve IVF success rates in the UK?

Understanding how the GM1 component regulates calcium movement in sperm could help embryologists better prepare sperm samples for IVF and ICSI procedures. This knowledge may lead to improved sperm selection techniques, potentially boosting success rates at UK fertility clinics regulated by the HFEA.

Will this discovery lead to better non-hormonal contraceptives?

Yes, researchers believe this finding could help develop new spermicides that work without harsh detergents, which can increase susceptibility to sexually transmitted infections. A GM1-based contraceptive could trigger sperm to become non-functional before reaching the egg, offering a gentler alternative to current options available in the UK.

When will new fertility treatments based on this research be available in the UK?

It typically takes many years for laboratory discoveries to become approved treatments available through NHS fertility services or private clinics. Couples currently TTC should continue following NICE guidelines and speak with their GP about existing options, including NHS-funded IVF cycles where CCG criteria are met.

How can I support my partner's sperm health while trying to conceive naturally?

While waiting for new treatments to emerge from research like this, the NHS recommends maintaining a healthy weight, reducing alcohol intake, stopping smoking, and avoiding tight underwear to support sperm health. If you've been trying to conceive for over a year without success, your GP can refer you for semen analysis and discuss potential NHS fertility treatment pathways.

Does this research explain why some couples have unexplained infertility?

This discovery about GM1 and calcium channels could help explain some cases of unexplained infertility, which affects many UK couples seeking answers. Problems with this specific fertilisation mechanism might not show up in standard semen analysis tests, highlighting the need for more advanced diagnostic tools in NHS and private fertility clinics.