title: Histamine in the retina.
abstract: Retina and choroid were rapidly and gently extracted from chickens, guinea-pigs, rats, rabbits and cows. They were frozen, weighted and pooled in 3% trichloroacetic acid in a refrigerator. Using a radioenzymic assay, histamine was found to be present in the retina of guinea-pig (4.26 +/- 0.677 nmol g-1), rabbit (1.08 +/- 0.422 nmol g-1) and cow (0.189 +/- 0.036 nmol g-1), but not detected in chicken and rat. In the choroid, histamine was found in all species except rat (chicken: 4.92 +/- 0.542 nmol g-1; guinea-pig: 121.5 +/- 4.46 nmol g-1; rabbit: 18.7 +/- 3.93 nmol g-1; cow; 0.36 +/- 0.095 nmol g-1). The study verifies the presence of histamine in the retina of some species, and thereby supports previous fluorometry assays.
mesh_terms: D000818:Animals; D002417:Cattle; D002645:Chickens; D002829:Choroid / Q000378:metabolism; D005260:Female; D006168:Guinea Pigs; D006632:Histamine / Q000378:metabolism*; D008297:Male; D008722:Methods; D011817:Rabbits; D051381:Rats; D012160:Retina / Q000378:metabolism*; D013045:Species Specificity
chemical_list: D006632:Histamine