Biomaterial Database

Inflammatory actions of platelet activating factor (Pafacether) in guinea-pig skin. 1983

J Morley, and C P Page, and W Paul

Cutaneous responses to synthetic platelet activating factor (Paf-acether) have been studied in guinea-pigs by means of radioisotopic marker techniques. Intradermal injection of Paf-acether elicited increased plasma protein extravasation (IPPE) (0.2-200 pmol/site), platelet accumulation (PA) (20-200 pmol/site) and red blood cell accumulation (RBCA) (200 pmol/site), whereas lyso-Paf (up to 2 nmol/site) was inactive in all these respects. Following intradermal injection, the IPPE responses to Paf-acether (2 and 20 pmol/site) were complete within 15 and 30 min respectively, although in response to 200 pmol/site, IPPE was detectable up to 1.5 h. The PA and RBCA responses to Paf-acether (200 pmol/site) were complete within 1 h. IPPE induced by Paf-acether (3 pmol/site) was potentiated by concomitant intradermal injection of a cutaneous vasodilator prostaglandin E2 (PGE2, 1 nmol/site) and inhibited by the beta-adrenoceptor agonist, isoprenaline (4.5 nmol/site) or the alpha-adrenoceptor agonist, phenylephrine (6 nmol/site). Such observations are consistent with Paf-acether effecting increased vessel wall permeability. Intradermal injection of PGE1 (3 nmol/site) significantly reduced PA in response to Paf-acether (200 pmol/site), whilst significantly enhancing IPPE. This dissociation of increased vascular permeability from PA is consistent with Paf-acether eliciting IPPE via a platelet-independent mechanism. These results indicate that a direct effect on vessel wall permeability contributes to the inflammatory response to Paf-acether in guinea-pig skin. It is suggested that Paf-acether is a potential mediator of allergy and inflammation.

UI	MeSH Term	Description	Entries
D007249	Inflammation	A pathological process characterized by injury or destruction of tissues caused by a variety of cytologic and chemical reactions. It is usually manifested by typical signs of pain, heat, redness, swelling, and loss of function.	Innate Inflammatory Response,Inflammations,Inflammatory Response, Innate,Innate Inflammatory Responses
D008297	Male		Males
D010972	Platelet Activating Factor	A phospholipid derivative formed by PLATELETS; BASOPHILS; NEUTROPHILS; MONOCYTES; and MACROPHAGES. It is a potent platelet aggregating agent and inducer of systemic anaphylactic symptoms, including HYPOTENSION; THROMBOCYTOPENIA; NEUTROPENIA; and BRONCHOCONSTRICTION.	AGEPC,Acetyl Glyceryl Ether Phosphorylcholine,PAF-Acether,Phosphorylcholine, Acetyl Glyceryl Ether,1-Alkyl-2-acetyl-sn-glycerophosphocholine,Platelet Aggregating Factor,Platelet Aggregation Enhancing Factor,Platelet-Activating Substance,Thrombocyte Aggregating Activity,1 Alkyl 2 acetyl sn glycerophosphocholine,Aggregating Factor, Platelet,Factor, Platelet Activating,PAF Acether,Platelet Activating Substance
D010974	Platelet Aggregation	The attachment of PLATELETS to one another. This clumping together can be induced by a number of agents (e.g., THROMBIN; COLLAGEN) and is part of the mechanism leading to the formation of a THROMBUS.	Aggregation, Platelet
D011458	Prostaglandins E	(11 alpha,13E,15S)-11,15-Dihydroxy-9-oxoprost-13-en-1-oic acid (PGE(1)); (5Z,11 alpha,13E,15S)-11,15-dihydroxy-9-oxoprosta-5,13-dien-1-oic acid (PGE(2)); and (5Z,11 alpha,13E,15S,17Z)-11,15-dihydroxy-9-oxoprosta-5,13,17-trien-1-oic acid (PGE(3)). Three of the six naturally occurring prostaglandins. They are considered primary in that no one is derived from another in living organisms. Originally isolated from sheep seminal fluid and vesicles, they are found in many organs and tissues and play a major role in mediating various physiological activities.	PGE
D001798	Blood Proteins	Proteins that are present in blood serum, including SERUM ALBUMIN; BLOOD COAGULATION FACTORS; and many other types of proteins.	Blood Protein,Plasma Protein,Plasma Proteins,Serum Protein,Serum Proteins,Protein, Blood,Protein, Plasma,Protein, Serum,Proteins, Blood,Proteins, Plasma,Proteins, Serum
D004903	Erythrocyte Aggregation	The formation of clumps of RED BLOOD CELLS under low or non-flow conditions, resulting from the attraction forces between the red blood cells. The cells adhere to each other in rouleaux aggregates. Slight mechanical force, such as occurs in the circulation, is enough to disperse these aggregates. Stronger or weaker than normal aggregation may result from a variety of effects in the ERYTHROCYTE MEMBRANE or in BLOOD PLASMA. The degree of aggregation is affected by ERYTHROCYTE DEFORMABILITY, erythrocyte membrane sialylation, masking of negative surface charge by plasma proteins, etc. BLOOD VISCOSITY and the ERYTHROCYTE SEDIMENTATION RATE are affected by the amount of erythrocyte aggregation and are parameters used to measure the aggregation.	Erythrocyte Aggregation, Intravascular,Agglutination, Intravascular,Intravascular Agglutination,Intravascular Erythrocyte Aggregation,Rouleaux Formation, Erythrocyte,Agglutinations, Intravascular,Aggregation, Erythrocyte,Aggregation, Intravascular Erythrocyte,Aggregations, Erythrocyte,Aggregations, Intravascular Erythrocyte,Erythrocyte Aggregations,Erythrocyte Aggregations, Intravascular,Erythrocyte Rouleaux Formation,Erythrocyte Rouleaux Formations,Formation, Erythrocyte Rouleaux,Formations, Erythrocyte Rouleaux,Intravascular Agglutinations,Intravascular Erythrocyte Aggregations,Rouleaux Formations, Erythrocyte
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
D000527	Alprostadil	A potent vasodilator agent that increases peripheral blood flow.	PGE1,Prostaglandin E1,Caverject,Edex,Lipo-PGE1,Minprog,Muse,PGE1alpha,Prostaglandin E1alpha,Prostavasin,Prostin VR,Prostine VR,Sugiran,Vasaprostan,Viridal,Lipo PGE1
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia