Ittipon PhoungpetcharaYotsawan TinikulJaruwan PoljaroenCharoonroj ChotwiwatthanakunRapeepun VanichviriyakitMorakot SroyrayaPeter J. HannaPrasert SobhonMahidol UniversityDeakin University2018-05-032018-05-032011-01-01Tissue and Cell. Vol.43, No.3 (2011), 165-17715323072004081662-s2.0-79960221505https://repository.li.mahidol.ac.th/handle/20.500.14594/11615We found that the androgenic gland (AG) of Macrobrachium rosenbergii possesses three cell types. Type I cells are small polygonal shaped-cells (13.4. μm in diameter), stain strongly with hematoxylin-eosin (H & E), have abundant multilayered rough endoplasmic reticulum (rER), and nuclei containing mostly heterochromatin. Type II cells are slightly larger (18.6. μm in diameter), stain lightly with H & E, have rER with dilated cisternae, and nuclei containing mostly euchromatin. Type III cells (previously undescribed) are similar in size and shape to type I cells, but the cytoplasm is unstained and they have a high amount of smooth endoplasmic reticulum (sER) and mitochondria with tubular cristae. Bilateral eyestalk-ablation resulted in AG hypertrophy with a proliferation and predominance of type I cells as determined by bromodeoxyuridine (BrdU) assays. Expression of insulin-like androgenic gland hormone (Mr-IAG), determined by immunohistochemistry, was weak in type I cells, strong in type II cells of both the intact and eyestalk-ablated, and negative in type III cells. It was also detected in spermatogonia, nurse cells, and epithelium lining of the spermatic duct. The function of Mr-IAG in these tissues is yet to be elucidated but the distribution implies a strong role in male reproduction. © 2011 Elsevier Ltd.Mahidol UniversityBiochemistry, Genetics and Molecular BiologyArticleSCOPUS10.1016/j.tice.2011.02.001