PMID- 33046165 OWN - NLM STAT- MEDLINE DCOM- 20210907 LR - 20210907 IS - 1435-8115 (Electronic) IS - 1431-9276 (Linking) VI - 26 IP - 6 DP - 2020 Dec TI - Histological and Ultrastructural Studies of the Unique Hemopoietic-Endocrine Organ of the Grass Carp, Ctenopharyngodon idella (Valenciennes, 1844). PG - 1264-1273 LID - 10.1017/S1431927620024575 [doi] AB - Specific features of the immunohistochemical and ultrastructural organization of the hemopoietic head-kidney (HK) in adult Ctenopharyngodon idella (Valenciennes, 1844) were investigated using light and transmission electron microscopy. The HK of grass carp possessed all developmental stages of leucocytes and erythrocytes, as well as dendritic cells and epithelial reticular cells. The rodlet cells were expressed alpha-smooth muscle actin (SMA). In addition, macrophages were the most numerous cells in the HK, which aggregated into structures called melanomacrophage centers (MMCs). On contrary, the chromaffin and interrenal cells (ICs) were mixed and organized into large anastomosing cords, which lined the posterior cardinal veins of the HK, and associated with many blood capillaries. The ICs displayed the characteristic features of steroid-producing cells. Three types of chromaffin cells: adrenaline, noradrenaline, and small granule-containing cells were observed in the HK. Glial fibrillary acidic protein (GFAP)-positive sustentacular cells were marked among the chromaffin cells. Hemopoietic cells, immune cells, MMCs, rodlet cells, in addition to three types of chromaffin cells and one type of interrenal cells in the HK were correlated with the functional significance of the fish concerned. FAU - Mokhtar, Doaa M AU - Mokhtar DM AUID- ORCID: 0000-0001-7975-3926 AD - Department of Anatomy and Histology, Faculty of Veterinary Medicine, Assiut University, Assiut71526, Egypt. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - Microsc Microanal JT - Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada JID - 9712707 SB - IM MH - Animals MH - *Carps MH - *Chromaffin Cells MH - Head Kidney MH - Macrophages MH - Microscopy, Electron, Transmission OTO - NOTNLM OT - TEM OT - hemopoietic cells OT - immune cells OT - immunohistochemistry OT - interrenal cells OT - melanomacrophage EDAT- 2020/10/14 06:00 MHDA- 2021/09/08 06:00 CRDT- 2020/10/13 05:28 PHST- 2020/10/14 06:00 [pubmed] PHST- 2021/09/08 06:00 [medline] PHST- 2020/10/13 05:28 [entrez] AID - S1431927620024575 [pii] AID - 10.1017/S1431927620024575 [doi] PST - ppublish SO - Microsc Microanal. 2020 Dec;26(6):1264-1273. doi: 10.1017/S1431927620024575.