Biomaterial Database

Endogenously formed leukotriene C4 activates LTC4 receptors in guinea pig tracheal strips. 1991

D W Snyder, and H L Cho, and J Gilmore

Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285.

The bioconversion of leukotriene (LT) C4 to LTD4 via gamma-glutamyl transpeptidase is clearly defined in guinea pig trachea. Acivicin, an inhibitor of gamma-glutamyl transpeptidase, was used to study the contractile responses elicited by either endogenously released or exogenously administered LTC4 and the antagonistic nature of LY 171883 and ICI 204,219, LTD4/LTE4 receptor antagonists, on guinea pig tracheal strips. Pretreating tracheal strips with acivicin resulted in a concentration-related, selective leftward shift in the LTC4 concentration-response curves. Potency of LTC4 was increased 3-fold. Likewise, antigen concentration response curves were potentiated in acivicin-pretreated tissues. Antagonism of LTC4 and antigen contractile responses by LY 171883 and ICI 204,219 were reduced or abolished by acivicin-pretreatment. In contrast, these receptor antagonists effectively blocked LTD4 responses in control and acivicin-pretreated tissues. The results demonstrated that inhibition of gamma-glutamyl transpeptidase by acivicin blocked the bioconversion of LTC4 to LTD4 regardless of the source of LTC4. Data indicated that endogenously formed LTC4 was able to activate the LTC4 receptor in guinea pig tracheal strips.

UI	MeSH Term	Description	Entries
D007211	Indoles	Benzopyrroles with the nitrogen at the number one carbon adjacent to the benzyl portion, in contrast to ISOINDOLES which have the nitrogen away from the six-membered ring.
D007555	Isoxazoles	Azoles with an OXYGEN and a NITROGEN next to each other at the 1,2 positions, in contrast to OXAZOLES that have nitrogens at the 1,3 positions.	Isoxazole
D008297	Male		Males
D009119	Muscle Contraction	A process leading to shortening and/or development of tension in muscle tissue. Muscle contraction occurs by a sliding filament mechanism whereby actin filaments slide inward among the myosin filaments.	Inotropism,Muscular Contraction,Contraction, Muscle,Contraction, Muscular,Contractions, Muscle,Contractions, Muscular,Inotropisms,Muscle Contractions,Muscular Contractions
D009130	Muscle, Smooth	Unstriated and unstriped muscle, one of the muscles of the internal organs, blood vessels, hair follicles, etc. Contractile elements are elongated, usually spindle-shaped cells with centrally located nuclei. Smooth muscle fibers are bound together into sheets or bundles by reticular fibers and frequently elastic nets are also abundant. (From Stedman, 25th ed)	Muscle, Involuntary,Smooth Muscle,Involuntary Muscle,Involuntary Muscles,Muscles, Involuntary,Muscles, Smooth,Smooth Muscles
D010047	Ovalbumin	An albumin obtained from the white of eggs. It is a member of the serpin superfamily.	Serpin B14
D011971	Receptors, Immunologic	Cell surface molecules on cells of the immune system that specifically bind surface molecules or messenger molecules and trigger changes in the behavior of cells. Although these receptors were first identified in the immune system, many have important functions elsewhere.	Immunologic Receptors,Immunologic Receptor,Immunological Receptors,Receptor, Immunologic,Receptors, Immunological
D002217	Carbachol	A slowly hydrolyzed CHOLINERGIC AGONIST that acts at both MUSCARINIC RECEPTORS and NICOTINIC RECEPTORS.	Carbamylcholine,Carbacholine,Carbamann,Carbamoylcholine,Carbastat,Carbocholine,Carboptic,Doryl,Isopto Carbachol,Jestryl,Miostat,Carbachol, Isopto
D006168	Guinea Pigs	A common name used for the genus Cavia. The most common species is Cavia porcellus which is the domesticated guinea pig used for pets and biomedical research.	Cavia,Cavia porcellus,Guinea Pig,Pig, Guinea,Pigs, Guinea
D006877	Hydroxamic Acids	A class of weak acids with the general formula R-CONHOH.	Hydroxamic Acid,Acid, Hydroxamic,Acids, Hydroxamic