first messenger

first mes·sen·ger

a hormone that binds to a receptor on the cell surface and, in so doing, communicates with intracellular metabolic processes.

first messenger

A HORMONE or NEUROTRANSMITTER operating outside a cell and interacting with a cell membrane receptor. The second messenger operates within the cell.

first mes·sen·ger

(fĭrst mesĕn-jĕr)
Hormone that binds to a receptor on cell surface and, in so doing, communicates with intracellular metabolic processes.
References in classic literature ?
As another officer sped his horse after the first messenger, the general beamed upon the earth like a sun.
The easy way was to write to her, and send the letter, by the first messenger he could find, to the inn.
So it is an honor for us to collaborate with one of the most influential and well-known artists of his time, especially when his work emerged in New York City, around the same time as Manhattan Portage's first messenger bags.
Furthermore, the Odigo Messenger is the first messenger that connects the two largest IMs - ICQ and AIM - both owned by AOL, enabling users of AIM and ICQ to chat with each other for the first time.
ATP has a dual role as both an energy source for enzymatic reactions and as a first messenger for several classes of G protein-coupled receptors and ligand-gated ion channels.
Furthermore, the Odigo technology used in OneWorld Internet Communicator is the first messenger that connects the two largest IMS -- ICQ and AIM -- both owned by AOL, enabling users of AIM and ICQ to chat with each other for the first time.
IL12 isn't the first messenger molecule to raise the hope of a wonder drug.
della Q's first messenger bag, the rugged "Molly" is black with a brilliant silk stripe accent and includes multiple pockets inside and out -- MSRP $58.
MECA, a leader in promotional messenger marketing services announced today that it has inked a deal with mobile messaging firm IPSH to create the first messenger interoperable carrier interoperable (MICI) solution.
Cell Therapeutics has demonstrated that certain first messenger cytokines such as Interleukin-1 (IL-1) and Tumor Necrosis Factor (TNF), which bind to receptors imbedded in a cell membrane, induce the production of specific molecular species of phosphatidic acid implicated in cellular activation.
Modi's emissaries were the first messengers of that hope.
And these genes may be genes that control rates of biosynthesis of important second and even first messengers.