Prostaglandin D2 (or PGD2) is a prostaglandin that binds to the receptor PTGDR (DP1), as well as CRTH2 (DP2). It is a major prostaglandin produced by mast cells – recruits Th2 cells, eosinophils, and basophils. In mammalian organs, large amounts of PGD2 are found only in the brain and in mast cells. It is critical to development of allergic diseases such as asthma.
Research carried out in 1989 found PGD2 is the primary mediator of vasodilation (the "niacin flush") after ingestion of niacin (nicotinic acid).
A 2012 research paper indicates a causal link between elevated levels of localized PGD2 and hair growth inhibition. Applied topically, the researchers found PGD2 prevents hair growth, and mice that were genetically inclined to produce higher levels of PGD2 had inhibited hair growth. The researchers also found PGD2 levels were much higher in balding scalp tissue than nonbalding scalp tissue, through increased levels of prostaglandin D2 synthase. The paper suggested that inhibition of hair growth involved binding of PGD2 to a receptor called GPR44, and that GPR44 therefore would be a therapeutic target for androgenic alopecia in both men and women with hair loss and thinning. Because PGD2's relation to asthma has been known for several years, several drugs that seek to reduce the effect of PGD2 through blocking the GPR44 are already in clinical trials.
PGD may refer to:
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Saludas al dia quizas igual con resaca
Y en el bar de la esquina tres cortaos con coñac
Vas por la calle un dia cualquiera
La chupa sobre el hombre mas jodido que el copon
Vas por la calle un dia cualquiera
Moskeado con todos cagandote en dios.
No se donde vivo, no se que hora es,
No se si es mañana o todovia ayer
No se donde vivo solo se que estoy
Hasta los mismo huevos mecago en dios...
En tu bolsillo hay que joder
Te queda lo justo para comer
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Lo poco que tienes para privar
Compras un porros bebes clarete
Te bonos borracho te ries de la gente
Vas por la calle un dia kualkiera