Hyperglycemia Caused by the Oral Administration of Glucose in Turtles

Correa, Juana P.; Marques, M. G.; Wagner, Edgar

doi:10.1210/endo-66-5-731

Cited by 10 publications

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“…He also observed that plasma insulin reached its peak in winter when blood glucose was at a minimum. Similarly, a comparable plasma glucose level (69.97-119.27 mg%) was observed in this reptile (C. dorbigini) during different periods of reproduction (Correa et al 1960).…”

Section: Discussionsupporting

confidence: 74%

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Variation in plasma glucose and pancreatic β cells in the turtle, Lissemys punctata (order: Chelonia; family: Trionychidae)

Chandavar

Naik

2004

Acta Zoologica

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 AbstractChandavar, V. R. and Naik, P. R. Variation in plasma glucose and pancreatic β cells in the turtle, Lissemys punctata (order: Chelonia; family: Trionychidae). -Acta Zoologica (Stockholm) 85 : 113-118The present study relates to the determination of the plasma glucose level and volumetric analysis of β cells in pancreatic islets of the soft-shelled turtle Lissemys punctata during different phases of its reproductive cycle. Reproductive events play a vital role in influencing the plasma glucose level and β -cell behaviour in the pancreatic islets. The colour of the pancreas is either yellowish or pinkish, depending on endocrine activity. Islets are present throughout the gland and range from individual cells to small or large clumps, depending on the seasonal cycle. Splenic islets are dense with more blood capillaries and nerve innervations irrespective of sex and season. The endocrine cell mass forms irregular patches without connective tissue capsule. β cells occupy the inner region of the islets, being surrounded by other cell types. Lissemys punctata exhibits higher β -cell activity during hibernation. Most insulin-secreting cells acquire a larger size during the regressive period. An analysis indicates that β cells outnumber the non-β endocrine cell mass in both number and per cent volume. There is negative correlation between islet mass and animal weight. Between the periods of reproductive cycles, a difference exists with respect to fasting plasma glucose and β -cell volume.

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Section: Discussionsupporting

confidence: 74%

“…However, no study has been carried out on turtles in this regard. Correa et al . (1960) investigated the fate of β cells during oral administration of glucose in the turtle Chrysemys dorbigini .…”

Section: Introductionmentioning

confidence: 99%

Variation in plasma glucose and pancreatic β cells in the turtle, Lissemys punctata (order: Chelonia; family: Trionychidae)

Chandavar

Naik

2004

Acta Zoologica

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“…Though M. trijuga was not treated with glucose, in their natural condition they showed a rise in plasma glucose and had larger islets during the regressive period, which corresponded with winter. The highest blood sugar values were obtained during winter in C. dorbigini (Correa et al 1960), possibly due to low temperature and subsequent lowering of metabolism in these poikilothermic animals, resulting in a reduction in the consumption of glucose. Dessauer (1970) reported that during extended dives, P. scripta and C. picta switched over to anaerobic glycolysis as a source of energy, resulting in a marked increase in their blood glucose levels.…”

Section: Discussionmentioning

confidence: 98%

“…In L. punctata, it was 96.87 ± 3.63 mg% in the regenerative period, reached a maximum in the reproductive (119.27 ± 1.68 mg%) and was the minimum during the regressive period (91.39 ± 2.76 mg%) (P ≤ 0.05). Correa et al (1960) fed two groups of Chrysemys dorbigini oral glucose -during winter and summer. The winter group showed higher blood glucose values than the summer group.…”

Section: Discussionmentioning

confidence: 99%

Immunocytochemical detection of glucagon and insulin cells in endocrine pancreas and cyclic disparity of plasma glucose in the turtle Melanochelys trijuga

Chandavar

Naik

2008

J Biosci

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The present investigation was carried out to know the seasonal variation in plasma glucose,insulin and glucagon cells during the reproductive cycle of untreated Melanochelys trijuga. Pancreatic endocrine cells were immunochemically localized.Insulin-immunoreactive (IR) cells occurred in groups of 3-20 and were in close apposition, while glucagon-IR cells were distributed individually between the exocrine pancreas or formed anastomosing cords where cells were not intimately attached. Whenever both IR cell types were present together forming an islet,insulin-IR cells formed clusters in the centre with glucagon-IR cells being scattered at the periphery. Glucagon-IR cells seemed to be secretory throughout the pancreas during the reproductive cycle,while insulin-IR cells were found to be pulsating in their secretion. Mean size of the islet was 1.306, 0.184 and 2.558 mm in the regenerative, reproductive and regressive periods,respectively. In general,insulin-IR cells measured 5.18 (mu)m and glucagon-IR cells 5.22 (mu)m in their longest axis. Invariably, glucagon-IR cells were more in number than insulin-IR cells. The fasting plasma glucose level was 69.97 mg% during the regenerative period, which increased to 97.96 mg% during the reproductive period,and reached a peak value of 113.52 mg% in the regressive period.

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“…A curva de tolerância à glicose em C hrysem ys tam bém é m ais prolongada no inverno (Lopes et al, 1954) e, da mesma form a, a adm inistração de glicose em tratam ento prolongado provoca hiperglicemia muito mais intensa nesta época (Riet Corrêa, M arques e Wagner, 1960). Pareceria, pois, que a atividade do pâncreas da Chrysem ys encontra-se reduzida no inverno, sendo êle incapaz de liberar a insulina necessária para restau ra r a glicemia em curto prazo de tempo ou que, ao contrário, os tecidos periféri cos não respondem ao aumento de insulina, não havendo por tanto uma adequada utilização de glicose.…”

Section: Tabela 10unclassified

Efeitos do Glucagon no metabolismo glicídico de Chrysemys d'orbignyi (Reptilia, Chelonia) sob a influência das variações estacionais

Marques¹

1970

Bol. Inst. Biociênc. Univ. São Paulo, Nova Sér. Zool. Biol. Mar

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Hyperglycemia Caused by the Oral Administration of Glucose in Turtles

Cited by 10 publications

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Variation in plasma glucose and pancreatic β cells in the turtle, Lissemys punctata (order: Chelonia; family: Trionychidae)

Variation in plasma glucose and pancreatic β cells in the turtle, Lissemys punctata (order: Chelonia; family: Trionychidae)

Immunocytochemical detection of glucagon and insulin cells in endocrine pancreas and cyclic disparity of plasma glucose in the turtle Melanochelys trijuga

Efeitos do Glucagon no metabolismo glicídico de Chrysemys d'orbignyi (Reptilia, Chelonia) sob a influência das variações estacionais

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