Spermatozoa Chemotaxis

Embryology - 19 May 2024        Expand to Translate
Google Translate - select your language from the list shown below (this will open a new external page)
العربية | català | 中文 | 中國傳統的 | français | Deutsche | עִברִית | हिंदी | bahasa Indonesia | italiano | 日本語 | 한국어 | မြန်မာ | Pilipino | Polskie | português | ਪੰਜਾਬੀ ਦੇ | Română | русский | Español | Swahili | Svensk | ไทย | Türkçe | اردو | ייִדיש | Tiếng Việt    These external translations are automated and may not be accurate. (More? About Translations)

<html5media height="550" width="512">File:Spermatozoa chemotaxis PMID23183693.mp4</html5media> Click Here to play on mobile device

Sea Urchin Spermatozoa Chemotaxis Modern version of Lillie's historic 1902 sea urchin spermatozoa experiment. Chemotaxis is the attractive movement of an organism in response to a chemical stimulus, usually toward or "up" the chemical concentration gradient. Spermatozoa of other species respond to different chemical attractants. In human fertilization, this is probably progesterone released by glomerulosa cells surrounding and bound to the oocyte zona pellucida. Kaubb's 2012 experiment (on the left) shows the release of resact with a UV flash induces accumulation of sperm in the illuminated area while an annulus around the flash becomes depleted of sperm. After several seconds, the gradient dissipates because of resact binding and diffusion. (text from figure legend) Resact - Causes stimulation of sperm respiration and motility through intracellular alkalinization, transient elevations of cAMP, cGMP and calcium levels in sperm cells, and transient activation and subsequent inactivation of the membrane form of guanylate cyclase. Links: MP4 version | Fertilization | Spermatozoa Development | Sea Urchin Development | Movies

---

Reference

Copyright

Rockefeller University Press - Copyright Policy This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.jcb.org/misc/terms.shtml). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at https://creativecommons.org/licenses/by-nc-sa/4.0/ ). (More? Help:Copyright Tutorial)