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- W2252542852 abstract "The in vitro sensitivity of integumental pigment cells (melanophores) to darkening hormones was studied in a winter-active montane lizard (Sceloporus jarrovii) that rapidly changes color. The darkening responses, shown by dose-response curves, of skin samples to melanophore-stimulating hormone (α-MSH) were slightly higher at 15° than at 25°C, but not significantly so. At 35°C, as compared to 25°C, the darkening responses were dramatically and unexpectedly reduced, a sevenfold higher concentration of α-MSH being needed to elicit equivalent responses. Darkening responses to isoproterenol, a β-adrenoceptor agonist, applied to skins in the presence of the a-adrenoceptor blocker Dibenamine, were significantly diminished at both 15° and 35°C, as compared to 25°C The similarity of the dose-response curves for α-MSH at 15° and 29°C (no reduction in sensitivity at the lower temperature) and the marked decrease of response to α-MSH and isoproterenol at 35°C are consistent with the thermoregulatory chromatic behavior of the animal: dark color at low temperatures in order to maximize heat gain, and light color once high, activity body temperature is achieved. These in vitro results suggest a direct, temperature-dependent, cellular response of S. jarrovii chromatophores to hormones. The temperature pattern suggests that the cellular response may be adaptive. Parallel experiments performed with Anolis carolinensis, a species that displays physiological color changes for crypsis rather than thermoregulation, demonstrated that the sensitivities to both a-MSH and isoproterenol were significantly lower at 15° and 35°C, compared to 25°C Our results suggest that reptile pigment cell sensitivity to hormones at varying temperatures may be regulated at the cellular level." @default.
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- W2252542852 date "1994-05-01" @default.
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- W2252542852 title "Temperature Effects on in vitro Skin Darkening in the Mountain Spiny Lizard, Sceloporus jarrovi: A Thermoregulatory Adaptation?" @default.
- W2252542852 doi "https://doi.org/10.1086/physzool.67.3.30163763" @default.
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