The Effect of Water Temperature on the GABAergic and Reproductive Systems in Female and Male Goldfish (Carassius auratus)

Fraser, Eleanor J.; Bosma, Peter T.; Trudeau, Vance L.; Docherty, Kevin

doi:10.1006/gcen.2001.7714

Cited by 25 publications

(13 citation statements)

References 41 publications

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“…Among environmental factors, temperature is considered an important modulator of fish reproduction, including those aspects related to testicular function and spermatogenesis [8][9][10][11][12]. For instance, goldfish kept at low temperature showed reduced gonadotropin synthesis and release, which affected the normal progression of spermatogenesis [13,14]. Moreover, temperature seems to affect melatonin production, which transduces seasonal information and controls annual reproductive cycles [15,16].…”

Section: Introductionmentioning

confidence: 98%

Effects of Different Temperatures on Testis Structure and Function, with Emphasis on Somatic Cells, in Sexually Mature Nile Tilapias (Oreochromis niloticus)1

Alvarenga¹,

França²

2009

Biology of Reproduction

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The Nile tilapia (Oreochromis niloticus) is economically one of the most important freshwater fish and is an excellent model for studies under laboratory conditions. Temperature is considered a very important modulator of reproductive activity in fish, although few studies have specifically addressed the effects of this key factor on morphological and functional aspects of teleost testes. Therefore, our main objectives in the present study were to analyze the effects of different temperatures (20, 25, 30, and 35 degrees C) on testicular somatic and germ cells in sexually mature Nile tilapias. Compared with fish kept at other temperatures, tilapias maintained at 20 degrees C demonstrated increased (P < 0.05) Sertoli cell and Leydig cell proliferation, volume density and frequency of most type B spermatogonia, and germ cell apoptosis. Conversely, tubular fluid secretion was decreased (P < 0.05) in the same animals. Although not significant, type A spermatogonia proliferation followed the pattern established for Sertoli cell and Leydig cell mitotic activity, suggesting that they preferentially would proliferate at lower temperatures. Based on most results found in our study and considering that tilapias are nonseasonal breeders, we suggest a model for temperature action on tilapia testes in which lower temperature (20 degrees C) would favor type A spermatogonial renewal, Sertoli cell and Leydig cell proliferation, and germ cell apoptosis, whereas higher temperatures (30-35 degrees C) would trigger rapid germ cell differentiation. Thus, tilapias could potentially be utilized in studies involving hormones and factors related to Sertoli cell and Leydig cell proliferation and spermatogonial self-renewal or differentiation.

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Section: Introductionmentioning

confidence: 98%

Effects of Different Temperatures on Testis Structure and Function, with Emphasis on Somatic Cells, in Sexually Mature Nile Tilapias (Oreochromis niloticus)1

Alvarenga¹,

França²

2009

Biology of Reproduction

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“…Amongst these, temperature is an important variable that has a significant influence on aquatic ectotherms. Water temperature influences oxygen concentration, metabolism, reproduction and growth of fishes (Morgan et al ., 1999; Fraser et al ., 2002; Langston et al ., 2002). Induction of stress responses including those by environmental temperature variation determines whether an organism adapts to changed conditions, and survives or suffers from physiological disturbances (Matthews & Berg, 1997; Peuranen et al ., 2003).…”

Section: Introductionmentioning

confidence: 99%

Heat stress‐induced alterations of antioxidants in the freshwater fish Channa punctata Bloch

Kaur

Atif

Ali

et al. 2005

Journal of Fish Biology

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The effect of elevated temperature on the antioxidants in the freshwater fish Channa punctata was investigated. Fish stressed with an elevated temperature of 12 C, range AE 1 C over the ambient temperature for 3 h showed a significant (P < 0Á05-0Á01) reduction in the levels of antioxidants: reduced glutathione (GSH) and non-protein thiols. Activity of glutathione reductase was also reduced in all the tissues (liver, kidney and gills) after 3 h of heat stress and 24 h recovery. Catalase (CAT) showed enhanced activity in liver in both the conditions while gills and kidney showed a decreased CAT activity. Glutathione S-transferase (GST) activity in kidney and liver decreased significantly (P < 0Á05-0Á01) after 3 h of heat stress. At 24 h GST activity showed a tendency to normalize in all the tissues along with a concomitant increase in the GSH level in the kidney. Total and protein thiols in heat stressed fish when matched with controls, showed significant (P < 0Á05) reduction in the kidney only with a transient increase in liver and gills. Heat shock also induced lipid peroxidation in 3 h heat-treated and recovery groups when compared with controls. Elevated temperature therefore resulted in tissue specific and time-dependent alterations of antioxidants in the fish. It also induced lipid peroxidation in various tissues. # 2005 The Fisheries Society of the British Isles

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“…This derives mainly from prevalently elevated expression pattern of the extrasynaptic subunit (α 5 ) in Hyd and TEL of 6dAE conditions, whereas the other extrasynaptic subunit (α 4 ) was expressed predominantly in motor‐ and visual‐controlling sites such as Te and Thd of maintenance conditions. The involvement of α GABA A R subunits in neurophysiological events of fish should not be so surprising, insofar as GABAergic actions have been reported to control their reproductive, motor (Fraser et al, 2002), feeding (Martyniuk et al, 2005), and visual (Mora‐Ferrer and Neumeyer, 2009) activities. Moreover, anoxia induces increased GABAergic activities in brains of vertebrates that tolerate prolonged periods of oxygen depletion, such as fish of the genus Carassius and freshwater turtles of the genera Chrysemys and Trachemys , which are able to adapt to extreme environmental conditions by aestivating in a similar manner to that of the lungfish, genera Protopterus (Walsh et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Lungfish aestivating activities are locked in distinct encephalic γ-aminobutyric acid type A receptor α subunits

et al. 2011

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Ammonia in dipnoans plays a crucial role on neuronal homeostasis, especially for those brain areas that maintain torpor and awakening states in equilibrium. In the present study, specific α subunits of the major neuroreceptor inhibitory complex (GABA(A) R), which predominated during some phases of aestivation of the lungfish Protopterus annectens, turned out to be key adaptive factors of this species. From the isolation, for the first time, of the encoding sequence for GABA(A) R α₁, α₄ , and α₅ subunits in Protopterus annectens, qPCR and in situ hybridization levels of α₄ transcript in thalamic (P < 0.001) and mesencephalic (P < 0.01) areas proved to be significantly higher during long aestivating maintenance states. Very evident α₅ mRNA levels were detected in diencephalon during short inductive aestivating states, whereas an α₄ /α₁ turnover characterized the arousal state. Contextually, the recovery of physiological activities appeared to be tightly related to an evident up-regulation of α₁ transcripts in telencephalic and cerebellar sites. Surprisingly, TUNEL and amino cupric silver methods corroborated apoptotic and neurodegenerative cellular events, respectively, above all in telencephalon and cerebellum of lungfish exposed to long maintenance aestivating conditions. Overall, these results tend to underlie a novel GABAergic-related ON/OFF molecular switch operating during aestivation of the lungfish, which might have a bearing on sleeping disorders.

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The Effect of Water Temperature on the GABAergic and Reproductive Systems in Female and Male Goldfish (Carassius auratus)

Cited by 25 publications

References 41 publications

Effects of Different Temperatures on Testis Structure and Function, with Emphasis on Somatic Cells, in Sexually Mature Nile Tilapias (Oreochromis niloticus)1

Effects of Different Temperatures on Testis Structure and Function, with Emphasis on Somatic Cells, in Sexually Mature Nile Tilapias (Oreochromis niloticus)1

Heat stress‐induced alterations of antioxidants in the freshwater fish Channa punctata Bloch

Lungfish aestivating activities are locked in distinct encephalic γ-aminobutyric acid type A receptor α subunits

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