The distribution of APGWamide and RFamides in the central nervous system and ovary of the giant freshwater prawn, Macrobrachium rosenbergii |
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Authors: | Ronnarong Palasoon Sasiporn Panasophonkul Prapee Sretarugsa Peter Hanna Prasert Sobhon Jittipan Chavadej |
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Institution: | (1) Department of Anatomy, Faculty of Science, Mahidol University, Rama VI Road, Bangkok, 10400, Thailand;(2) Anatomy Unit, Department of Medical Science, Faculty of Science, Rangsit University, Pathum Thani, 12000, Thailand;(3) Faculty of Science and Technology, Deakin University, Geelong, VIC, 3217, Australia; |
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Abstract: | Immunohistochemistry was used to identify the distribution of both APGWamide-like and RFamide-like peptides in the central
nervous system (CNS) and ovary of the mature female giant freshwater prawn, Macrobrachium rosenbergii. APGWamide-like immunoreactivity (ALP-ir) was found only within the sinus gland (SG) of the eyestalk, in small- and medium-sized
neurons of cluster 4, as well as their varicosed axons. RFamide-like immunoreactivity (RF-ir) was detected in neurons of all
neuronal clusters of the eyestalk and CNS, except clusters 1 and 5 of the eyestalk, and dorsal clusters of the subesophageal,
thoracic, and abdominal ganglia. The RF-ir was also found in all neuropils of the CNS and SG, except the lamina ganglionaris.
These immunohistochemical locations of the APGWamide-like and RF-like peptides in the eyestalk indicate that these neuropeptides
could modulate the release of the neurohormones in the sinus gland. The presence of RFamide-like peptides in the thoracic
and abdominal ganglia suggests that it may act as a neurotransmitter which controls muscular contractions. In the ovary, RF-ir
was found predominantly in late previtellogenic and early vitellogenic oocytes, and to a lesser degree in late vitellogenic
oocytes. These RFs may be involved with oocyte development, but may also act with other neurohormones and/or neurotransmitters
within the oocyte in an autocrine or paracrine manner. |
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