Differential and reproductive stage-dependent regulation of vasotocin secretion by catecholamines in the catfish Heteropneustes fossilis

Singh, Rahul Kumar; Chaube, Radha; Joy, K.P.

doi:10.1016/j.cbpa.2013.09.005

Cited by 8 publications

(2 citation statements)

References 53 publications

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“…CA, an important component of monoaminergic system in the hypothalamus, modulates the levels of GnRH with subsequent release GTHs in teleosts including catfish [ 57 , 61 , 62 ]. The CAs include L-DOPA, DA and NA, all of which plays decisive roles in various physiological processes to control reproduction.…”

Section: Neuroendocrine Regulation-gnrhsmentioning

confidence: 99%

“…Variety of hormones/metabolites/neurotransmitters showed oocytes maturation effects in addition to maturation-inducing hormone (MIH) in catfish species. This included cortisol, vasotocin (VT), CEs and CAs [ 61 , 170 , 171 , 172 , 173 , 174 , 175 , 176 , 177 , 178 ]. Both GTH and ovarian steroids modulate VT levels in catfish to influence follicular growth, ovulation, and spawning [ 174 , 175 , 179 ].…”

Section: Gamete Maturationmentioning

confidence: 99%

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Advances in Reproductive Endocrinology and Neuroendocrine Research Using Catfish Models

Senthilkumaran

Kar

2021

Cells

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Catfishes, belonging to the order siluriformes, represent one of the largest groups of freshwater fishes with more than 4000 species and almost 12% teleostean population. Due to their worldwide distribution and diversity, catfishes are interesting models for ecologists and evolutionary biologists. Incidentally, catfish emerged as an excellent animal model for aquaculture research because of economic importance, availability, disease resistance, adaptability to artificial spawning, handling, culture, high fecundity, hatchability, hypoxia tolerance and their ability to acclimate to laboratory conditions. Reproductive system in catfish is orchestrated by complex network of nervous, endocrine system and environmental factors during gonadal growth as well as recrudescence. Lot of new information on the molecular mechanism of gonadal development have been obtained over several decades which are evident from significant number of scientific publications pertaining to reproductive biology and neuroendocrine research in catfish. This review aims to synthesize key findings and compile highly relevant aspects on how catfish can offer insight into fundamental mechanisms of all the areas of reproduction and its neuroendocrine regulation, from gametogenesis to spawning including seasonal reproductive cycle. In addition, the state-of-knowledge surrounding gonadal development and neuroendocrine control of gonadal sex differentiation in catfish are comprehensively summarized in comparison with other fish models.

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Section: Neuroendocrine Regulation-gnrhsmentioning

confidence: 99%

Section: Gamete Maturationmentioning

confidence: 99%

Advances in Reproductive Endocrinology and Neuroendocrine Research Using Catfish Models

Senthilkumaran

Kar

2021

Cells

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Changes in vasotocin levels in relation to ovarian development in the catfish Heteropneustes fossilis exposed to altered photoperiod and temperature

Chaube

Singh

Joy

2015

Fish Physiol Biochem

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Photoperiod and temperature are the major proximate factors that activate the brain-pituitary-gonadal-endocrine axis stimulating gonadal recrudescence. Vasotocin (VT), the basic nonapeptide hormone, is secreted by the nucleus preopticus in the hypothalamus and released from the pituitary into circulation as a neurohormone for physiological actions. Additionally, VT is secreted de novo in the ovary of the catfish and has been implicated in ovarian functions. In the present study, we evaluated the changes in VT secretion during altered photoperiod and temperature exposure. The ovarian changes were monitored over gonadosomatic index (GSI) and plasma steroid hormone levels. Exposure of the catfish to long photoperiod (LP, 16L:08D) daily, alone or in combination with high temperature (HT, 28 ± 2 °C), for 14 or 28 days resulted in a decrease in brain-pituitary VT level with a concomitant increase in plasma and ovarian VT levels. The changes were greater in the LP + HT group on day 28. Concurrently, the treatments stimulated the GSI and plasma estradiol-17β (E2), testosterone (T) and progesterone (P4) levels with higher more responses in the LP + HT group. Exposure of the catfish to short photoperiod (SP, 08L:16D) daily or total darkness (TD, 24L:00D) daily, with or without changing the ambient temperature, for 14 or 28 days produced a depressing effect on VT, GSI and steroid hormone levels, the range of the response varied with the temperature. The brain VT level was low except in the TD + NT group. Plasma and ovarian VT levels decreased more in the SP and TD groups under ambient temperature than in the groups at the raised temperature. The GSI and plasma steroid hormones (E2, T and P4) responded in a similar manner. Plasma cortisol level registered a significant increase in all the groups compared to the initial control groups, and the increase was significantly higher on day 28. The simultaneous activation of VT secretion and ovarian recrudescence by photoperiod and temperature suggests the peptide's involvement in the hormonal control of gametogenesis.

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In situ localization of vasotocin receptor gene transcripts in the brain-pituitary-gonadal axis of the catfish Heteropneustes fossilis: a morpho-functional study

Rawat

Chaube

Joy

2018

Fish Physiol Biochem

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Differential and reproductive stage-dependent regulation of vasotocin secretion by catecholamines in the catfish Heteropneustes fossilis

Cited by 8 publications

References 53 publications

Advances in Reproductive Endocrinology and Neuroendocrine Research Using Catfish Models

Advances in Reproductive Endocrinology and Neuroendocrine Research Using Catfish Models

Changes in vasotocin levels in relation to ovarian development in the catfish Heteropneustes fossilis exposed to altered photoperiod and temperature

In situ localization of vasotocin receptor gene transcripts in the brain-pituitary-gonadal axis of the catfish Heteropneustes fossilis: a morpho-functional study

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