Srirath Pakdeeronachit. Classification and distribution of hormone-producing cells in pars distalis of Rana Tigerina by immunocytochemical technique. Master's Degree(Anatomy). Mahidol University. Mahidol University Library and Knowledge Center. : Mahidol University, 1999.
Classification and distribution of hormone-producing cells in pars distalis of Rana Tigerina by immunocytochemical technique
Abstract:
The classification and distributions of cells producing growth hormone (GH), prolactin (PRL), adrenocorticotropin (ACTH), thyrotropin (TSH), luteinizing hormone (LH) and follicle-stimulating hormone(FSH) in pars distalis of iRana tigerina were investigated during breeding season by immunocytochemical and immunoelectronmicroscopic techniques. By immunocytochemistry, most of the immunoreactive GH cells are concentrated at the dorso-posterior region of pars distalis and some of them are distributed at the centro-ventral area. Prolactin cells are most numerous in number and are distributed throughout the gland except at the anterior-most area. There are two types of immunoreactive LH cells. Most of them are moderately immunoreactive-stained and concentrated at the centro-dorsal region; whereas a small number are intensely stained, and patches of them are distributed at the ventral rim of the gland. Immunoreactive FSH cells are distributed throughout the gland except at the anterior and posterior-most areas. Most of the immunoreactive TSH cells are concentrated at the ventral rim and centro-ventral region except at the anterior-most areas, while most of the immunoreactive ACTH cells are concentrated at the ventral-anterior region and some of them are distributed at the ventral half area. By immunogold technique, GH cells are characterized by the presence of round-shaped granules with about 345.69±3.47 nm in diameter (n= 167), dilated RER and a large number of lipid droplets, while PRL cells contain round-shaped granules about 500±5.9 nm. in size (n=203). GtH1 cells are positively reacted with only LHβ antiserum. They are large and characterized by the appearance of various shaped granules and dilated RER. Their granules are large and round (634±13.6 nm; n=40), rod (L.=592.8±14 nm, W.=381±12.7 nm; n=42), and dumbell-shaped (L.=752±25.7 nm, W.=278±8.5 nm, isthmus=191.2±12.1 1 nm; n=35). GtH2 cells are positively reacted with both LHβ and FSHbeta and similar in appearance to of GtH1 but contain some large round-shaped granules (764±13.2 nm in size; n=15), while GtH3 contain only large round shaped granules that are positively react with both LHbeta and FSHbeta. ACTH cells are identified by the presence of two types of round-shaped granules which are widely scattered and strikingly dilated RER. Type I granules are moderately electron-dense about 336.6±8.1 nm in size (n=89). whereas type II granules are electron-dense about 333.8±6.7 in size (n=98). TSH cells are characterized by round-shaped granules about 436±8.4 in size (n=50).