Abstract:
:Nitric oxide (NO) is well demonstrated to act as a neuronal messenger in neurotransmission in vertebrate animals. We are for the first time reporting nicotinamide adenine dinucleotide phosphate-diaphorase (NADPH-d) and neuronal nitric oxide synthase (nNOS) in the Mauthner cells (MC) of the carp, Labeo rohita brain during post-embryonic development. The NADPH-d and nNOS-positive MC were seen intensely labeled in all young stages on either side of the ventricle in the hindbrain. In adult, these cells were moderately stained with NADPH-d but not with nNOS. Further, the morphometeric analysis of the staining intensities showed the decrease in the optical densities of the MC as the development progresses. The gradual increase in cell diameter was evident from hatchling to adult (18-22 μm to 98-106 μm), while the nuclear diameter remained nearly unchanged (10-12 μm to 18-20 μm). In fishes, MC are known to be involved in the control of startle response. The NADPH-d enzymatic activity seen in the MC of early development may play an important role to activate the startle response to fast escape from the predators and unfavorable environmental conditions to survive during early phase of life. As nNOS is absent in the adult MC, we assume that the adult MC express a different splice variant of nNOS which is detected by NADPH-d, but not by the currently used antibody. Hence, the presence of nNOS (enzyme required for the synthesis of NO) in the MC suggests the involvement of NO in neurotransmission to generate the startle response rapidly. Furthermore, we also suggest that NO may be involved in other aspects such as pathway finding, neuronal cell migration, signaling and refinement during the development of the brain of L. rohita.
journal_name
Brain Struct Functjournal_title
Brain structure & functionauthors
Palande NV,Biswas S,Jadhao AGdoi
10.1007/s00429-010-0292-7subject
Has Abstractpub_date
2011-03-01 00:00:00pages
67-75issue
1eissn
1863-2653issn
1863-2661journal_volume
216pub_type
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