- first messenger n an extracellular substance (as the hormone epinephrine or the neurotransmitter serotonin) that binds to a cell-surface receptor and initiates intracellular activity compare SECOND MESSENGER
* * *a factor or hormone that binds to a receptor on the external surface of a cell and sets off a series of reactions that eventually convert a precursor into a second messenger.
Medical dictionary. 2011.
Look at other dictionaries:
First Messenger — First Mes|sen|ger [ fœ:st mɛsɪnʃə; engl. = erster Bote]: ↑ Bote … Universal-Lexikon
first messenger — Biochem. a hormone that triggers a biochemical reaction at a site removed from its release. Cf. second messenger. [1975 80] * * * … Universalium
first messenger — Biochem. a hormone that triggers a biochemical reaction at a site removed from its release. Cf. second messenger. [1975 80] … Useful english dictionary
messenger — 1. That which carries a message. 2. Having message carrying properties. first m. a hormone that binds to a receptor on the surface cell and, in so doing, communicates with intracellular metabolic processes. second m. an intermediary molecule that … Medical dictionary
MESSENGER — Caractéristiques Organisation … Wikipédia en Français
Messenger Plus! — preferences panel and about box … Wikipedia
Messenger Premier League — Current season or competition: 2010 Sport Table tennis Founded 1951 Motto Where Amazing Happens … Wikipedia
Messenger (magazine) — Messenger of the fullness of the Gospel is a Mormon fundamentalist publication, originally printed in Birmingham, England starting in 1991, which was in print in that country until 2001, and continues as a web based publication. It went under the … Wikipedia
First Council of Nicaea — Date 325 AD Accepted by Anglicans Assyrian Church of the East Calvinists Eastern Orthodox Lutherans Old Catholics Oriental Orthodox Roman Catholics Previous council None Next coun … Wikipedia
First Knight — Theatrical release poster Directed by Jerry Zucker Produced by … Wikipedia