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Immunohistochemical detection of GnRH‐like peptides in the neural ganglia and testis of Haliotis asinina
Author(s) -
Nuurai Parinyaporn,
Primphon Jeerawan,
Seangcharoen Tawanchay,
Tinikul Yotsawan,
Wanicha Chaitip,
Sobhon Prasert
Publication year - 2014
Publication title -
microscopy research and technique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 118
eISSN - 1097-0029
pISSN - 1059-910X
DOI - 10.1002/jemt.22304
Subject(s) - biology , gonadotropin releasing hormone , gene isoform , immunohistochemistry , anatomy , ganglion , immunofluorescence , medicine , endocrinology , hormone , luteinizing hormone , antibody , immunology , biochemistry , gene
ABSTRACT Gonadotropin releasing hormone (GnRH) is a peptide that is conserved in both vertebrate and invertebrate species. In this study, we have demonstrated the distribution pattern of two isoforms of GnRH‐like peptides in the neural ganglia and testis of reproductively mature male abalone , H. asinina , by immunohistochemistry and whole mount immunofluorescence. We found octopus (oct) GnRH and tunicate‐I (t) GnRH‐I immunoreactivities (ir) in type 1 neurosecretory cells (NS1) and they were expressed mostly within the ventral horn of the cerebral ganglion, whereas in pleuropedal ganglia they were localized primarily in the dorsal horn. Furthermore, tGnRH‐I‐ir were strongly detected in fibers at the caudal part of the cerebral ganglia and both ventral and dorsal horns of the pleuropedal ganglia. In the testis, only octGnRH‐ir was found primarily in the granulated cell and central capillaries within the trabeculae. These results suggest that multiple GnRH‐like peptides are present in the neural ganglia which could be the principal source of their production, whereas GnRH may also be synthesized locally in the testis and act as the paracrine control of testicular maturation. Microsc. Res. Tech. 77:110–119, 2014 . © 2014 Wiley Periodicals, Inc.