Données histologiques sur le cycle annuel de la glande thyroïde chez les vipères

Girons, H. Saint; Duguy, R.

doi:10.1016/0016-6480(62)90049-7

Cited by 22 publications

(7 citation statements)

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“…The first is in May just after the animal emerges from hibernation, the second is during October-November just before the animal enters hibernation. This conclusion agrees with that of St. Girons and Duguy (1962) who reported on two species of Vipera, but is at variance with that of Binyon and Twigg (1965) for Natri.v. Although Binyon and Twigg's work lacks statistical analysis, their data do suggest a slight increase in epithelial cell-height (about 25%)…”

Section: Table IIsupporting

confidence: 92%

“…Although these conclusions derive mainly from work on lizards, there is some information available on snakes.St. Girons and Duguy (1962) found that in two species of Vipera, the thyroid epithelial height is lowest in winter and increases to a maximum in early spring following the time of emergence from hibernation. It is low during the summer, but increases in autumn to a second peak.…”

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confidence: 99%

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SEASONAL CHANGES IN THE THYROID GLAND IN THE MALE COBRA,NAJA NAJAL

Chiu

Phillips

Maderson

1969

The Biological Bulletin

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The activity of the reptilian thyroid gland as judged by its histological appearance seems to be largely dependent on seasonal temperature and the reproductive state of the animal (see review, Lynn, 1969). Although these conclusions derive mainly from work on lizards, there is some information available on snakes.St. Girons and Duguy (1962) found that in two species of Vipera, the thyroid epithelial height is lowest in winter and increases to a maximum in early spring following the time of emergence from hibernation. It is low during the summer, but increases in autumn to a second peak. However, Binyon and Twigg (1965) found that Matrix presents a different picture from that of Vipera. In Natrix, the thyroid cell height is greatest in February, decreases steadily in July and October and is still low the following January. SUMMARY 1. Variations in the weight and follicular cell-height of the thyroid gland of the male cobra (Naja naja L.) have been studied for 12 consecutive months during a one year period.2. Changes in the weight of the gland were not correlated with follicular cell height.

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Section: Table IIsupporting

confidence: 92%

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confidence: 99%

SEASONAL CHANGES IN THE THYROID GLAND IN THE MALE COBRA,NAJA NAJAL

Chiu

Phillips

Maderson

1969

The Biological Bulletin

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“…With the improved methods now available for determining the time of ovulation in the human, evidence of such an association might now be obtained. Some evidence of such an association has been obtained in species less frequently studiedfor the dogfish by Olivereau (1949) and the viper by Saint Girons & Duguy (1962). These are all spontaneously ovulating animals; although early work suggests a release of pituitary TSH soon after mating in the rabbit, a species which does not ovulate spontaneously, no change in the rate of release of 131J from the thyroid gland after mating was observed (Brown-Grant, 1956).…”

Section: Discussionmentioning

confidence: 99%

The relationship between ovulation and the changes in thyroid gland activity that occur during the oestrous cycle in rats, mice and hamsters

Brown-Grant¹

1966

The Journal of Physiology

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SUMMARY1. When ovulation is prevented by the injection of pentobarbitone on the day of pro-oestrus in female rats, the expected increases in thyroidserum concentration ratio (T/S ratio) for 131I and in the uptake of 113I by the thyroid on the day of oestrus do not occur.2. Ovulation induced by human chorionic gonadotrophin or ovine luteinizing hormone in rats treated with pentobarbitone at pro-oestrus is not associated with an increase in T/S ratio or 131I uptake at oestrus.3. These results support the view that it is the neuro-endocrine changes at the hypothalamic or pituitary level that lead to ovulation rather than changes in the pattern of ovarian steroid secretion before or at ovulation that are responsible for the increased thyroid activity at oestrus in the female rat.4. Experimental evidence of an increase in thyroid activity after ovulation in mice and hamsters also supports this view.

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“…In lizards, thyroid activity has been demonstrated to be highest during the warmer seasons, with activity decreasing when the animals are placed at cooler temperatures [13]. Snakes exhibit the same pattern, with the highest thyroid activity coinciding with the warmer seasons and the lowest activity being observed during hibernation [14,15]. Exceptions to this pattern exist in some lizards inhabiting warmer climates in which lower temperatures lead to increases in thyroid activity [16,17].…”

Section: Introductionmentioning

confidence: 99%

Temporal and spatial variation in plasma thyroxine (T₄) concentrations in juvenile alligators collected from lake Okeechobee and the northern Everglades, Florida, USA

Gunderson

Bermudez

Bryan

et al. 2002

Enviro Toxic and Chemistry

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We examined variation in plasma thyroxine (T4) in juvenile American alligators (Alligator mississippiensis) collected from three sites within the Kissimmee River drainage basin (FL, USA). Based on historical sediment data, Moonshine Bay served as the low contaminant exposure site, Water Conservation Area 3A served as an intermediate contaminant exposure site, and Belle Glade served as the high contaminate exposure site. In May 1999, alligators (n = 22) from Water Conservation Area 3A exhibited higher T4 concentrations than animals from both Belle Glade (n = 22; p = 0.0003) and Moonshine Bay (n = 33; p = 0.001). In May 2000, alligators (n = 29) Water Conservation Area 3A again exhibited higher T4 concentrations than those from Belle Glade (n = 49; p = 0.02) but not those from Moonshine Bay (n = 40). No sexual dimorphism was observed among mean T4 concentrations within any of the sites during either year (p > 0.05). Animals within all sites exhibited higher T4 concentrations in May 2000 when compared to May 1999. When variance was examined, animals from Water Conservation Area 3A exhibited higher variance in plasma T4 concentrations than those from either Moonshine Bay or Belle Glade. We concluded that mean plasma T4 concentrations did not match the sediment contaminant mixture data presently available to us, whereas variance seems to be a more reliable indicator of contaminant exposure.

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Données histologiques sur le cycle annuel de la glande thyroïde chez les vipères

Cited by 22 publications

References 15 publications

SEASONAL CHANGES IN THE THYROID GLAND IN THE MALE COBRA,NAJA NAJAL

SEASONAL CHANGES IN THE THYROID GLAND IN THE MALE COBRA,NAJA NAJAL

The relationship between ovulation and the changes in thyroid gland activity that occur during the oestrous cycle in rats, mice and hamsters

Temporal and spatial variation in plasma thyroxine (T₄) concentrations in juvenile alligators collected from lake Okeechobee and the northern Everglades, Florida, USA

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Données histologiques sur le cycle annuel de la glande thyroïde chez les vipères

Cited by 22 publications

References 15 publications

SEASONAL CHANGES IN THE THYROID GLAND IN THE MALE COBRA,NAJA NAJAL

SEASONAL CHANGES IN THE THYROID GLAND IN THE MALE COBRA,NAJA NAJAL

The relationship between ovulation and the changes in thyroid gland activity that occur during the oestrous cycle in rats, mice and hamsters

Temporal and spatial variation in plasma thyroxine (T4) concentrations in juvenile alligators collected from lake Okeechobee and the northern Everglades, Florida, USA

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Temporal and spatial variation in plasma thyroxine (T₄) concentrations in juvenile alligators collected from lake Okeechobee and the northern Everglades, Florida, USA