Adrenomedullary Hormonal and Glycemic Responses to High Ambient Temperature in the Soft-Shelled Turtle, Lissemys punctata punctata

Ray, Prajna Paramita; Maiti, B. R.

doi:10.1006/gcen.2001.7606

Cited by 20 publications

(14 citation statements)

References 17 publications

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“…Steroid-producing cells per animal (Ray and Maiti, 2001) were counted in all sections and their nuclear area estimated in digital photomicrographs taken at x1,000 (Leica DM3000); cell counts and nuclear tracing were performed manually using the NIH ImageJ software. Cell density was estimated by dividing the number of cell nuclei on the total area sampled.…”

Section: Quantitative Organ Cyto-morphologymentioning

confidence: 99%

Hatchlings of the Marine Turtle Lepidochelys olivacea Display Signs of Prenatal Stress at Emergence after Being Incubated in Man-Made Nests: A Preliminary Report

et al. 2017

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Egg translocation and incubation in man-made nests (MMN) are common conservation practices through marine turtle hatcheries worldwide. These measures have been associated with reduced hatching rates, altered hatchling sex ratio, fetal dysmorphic anatomical features, and feeble hatchlings health. Previous studies have shown that MMN and natural nests (NN) provide different incubatory conditions. Therefore, incubatory challenges imposed by MMN conditions on fetal development could induce stress responses affecting hatchlings functional morphology later on life. There is no evidence of incubatory stress associated with conservation measures in turtle fetuses or hatchlings. Thus, in this paper we tested the hypothesis that MMN incubation exposes turtle fetuses to stressing conditions. Given that the hypothalamic-pituitary-interrenal axis begins functioning by day 11 of incubation in reptiles, our experiments explored the effects of incubatory conditions, rather than those associated with translocation, on fetal stress responses. We showed that Lepidochelys olivacea hatchlings incubated in MMN displayed reduced body weight, hypertrophic inter-renal glands, testicular hypotrophy and hypotrophic dorso-medial cortical pyramidal neurons, when compared with hatchlings emerging from NN. Furthermore, MMN hatchlings had higher serum levels of corticosterone at emergence, and displayed an attenuated acute stress response after traversing the beach. Therefore, the relocation of nests to protect them could negatively impact the health and survival of sea turtles. Thus, this action should only be undertaken when no alternative is available.

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Section: Quantitative Organ Cyto-morphologymentioning

confidence: 99%

Hatchlings of the Marine Turtle Lepidochelys olivacea Display Signs of Prenatal Stress at Emergence after Being Incubated in Man-Made Nests: A Preliminary Report

et al. 2017

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“…Calogero and others (21) have also reported the enhanced corticosterone release after arecoline administration in rats. Corticosterone release is also known to be enhanced during stress (31). Since arecoline acts as stressor (32,21), it might have stimulated the release mechanism of corticosterone in the current study.…”

Section: Discussionmentioning

confidence: 86%

“…Catecholamine (norepinephrine and epinephrine) concentrations were measured from the adrenal gland, instead of serum (31), because plasma norepinephrine is also secreted from extra-adrenomedullary sources such as sympathetic nerve terminals that richly innervate the CNS, hypothalamus, spleen and heart (32). The pineal also produces both norepinephrine and epinephrine in turtles (33).…”

Section: Adrenal Catecholaminesmentioning

confidence: 99%

Ultrastructural and hormonal modulations of adrenal gland with alterations of glycemic and liver glycogen profiles following arecoline administration in albino mice

Nag¹

2010

Acta Endo (Buc)

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Background. Arecoline, a plant alkaloid of betel nut, is consumed by millions of people, for increased capacity of work. It causes immunosuppression, hepatotoxicity, and disturbance in antioxidant production, but it stimulates HPA axis and induces thyroid dysfunction.Aim. To investigate the role of arecoline on adrenal activity, glycemia and glycogen profile in mice.Materials and methods. Arecoline was injected intraperitoneally at a dose of 10 mg/ kg body wt for 20-60 min for acute administration. In chronic administration the same dose was used daily for 15 days. Corticosterone, epinephrine, norepinephrine, blood glucose and liver glycogen profiles were measured after 20, 40 and 60 min, in acute administration and after 15 days in chronic administration.Results. Arecoline in acute administration increased corticosterone, norepinephrine and epinephrine levels and induced hyperglycemia with depletions of liver glycogen. But chronic arecoline administration with the same dose for 15 days caused ultrastructural degenerations of adrenal cortex and medulla with the elevation of corticosterone, and depletions of norepinephrine and epinephrine levels. Arecoline also caused hypoglycemia and elevated liver glycogen. Atropine (arecoline receptor antagonist) prevented arecoline action on adrenal activity or blood glucose -liver glycogen interaction.Conclusion. The findings indicate that arecoline initially stimulates adrenal activity, but subsequently inhibits it with alterations of glycemic and glycogen profiles. Arecoline action is mediated by arecoline receptor in mice. Arecoline may have immunological action via adrenal hormonal suppression in mice.

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“…All these manifestations indicate low activity of the B-cells in summer, whereas, in winter, the B-cell population is high with large cell size and nuclear size which are reflected in the C/N ratio, because C/N ratio is lower in winter than summer. Nuclear hypertrophy is known to be related to hyperactivity of the cell as reported in rat pinealocytes (Bandyopadhyay & Chakraborty 2010) and adrenocortical cells of turtles (Ray & Maiti 2001). Epithelial cell height (cell size) of thyroid follicles is also considered as an index of cell activity in turtles (Sarkar et al 2007).…”

Section: Discussionmentioning

confidence: 98%

Summer and winter changes in the pancreatic endocrine cells, hormones and carbohydrate metabolism of the soft-shelled turtleLissemys punctata punctataBonnoterre (Reptilia, Chelonia)

Sarkar

Maiti

2011

Italian Journal of Zoology

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Adrenomedullary Hormonal and Glycemic Responses to High Ambient Temperature in the Soft-Shelled Turtle, Lissemys punctata punctata

Cited by 20 publications

References 17 publications

Hatchlings of the Marine Turtle Lepidochelys olivacea Display Signs of Prenatal Stress at Emergence after Being Incubated in Man-Made Nests: A Preliminary Report

Hatchlings of the Marine Turtle Lepidochelys olivacea Display Signs of Prenatal Stress at Emergence after Being Incubated in Man-Made Nests: A Preliminary Report

Ultrastructural and hormonal modulations of adrenal gland with alterations of glycemic and liver glycogen profiles following arecoline administration in albino mice

Summer and winter changes in the pancreatic endocrine cells, hormones and carbohydrate metabolism of the soft-shelled turtleLissemys punctata punctataBonnoterre (Reptilia, Chelonia)

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