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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Developmental Plasticity Of Cutaneous Water Loss And Lipid Composition In Stratum Corneum Of Desert And Mesic Nestling House Sparrows
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Developmental Plasticity Of Cutaneous Water Loss And Lipid Composition In Stratum Corneum Of Desert And Mesic Nestling House Sparrows

机译：沙漠和中性雏鸟麻雀的角质层皮肤水分流失和脂质组成的发育可塑性

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Intercellular lipids of the stratum corneum (SC), the outer layer of the epidermis, form a barrier to water vapor diffusion through the skin. Previously, we measured cutaneous water loss (CWL) and lipid composition of the SC of adult house sparrows from two populations, one living in the deserts of Saudi Arabia and another living in mesic Ohio. Adult desert house sparrows had a lower CWL, a lower proportion of free fatty acids, and a higher proportion of ceramides and cerebrosides in the SC compared with mesic sparrows. In this study, we investigated developmental plasticity of CWL and lipid composition of the SC in desert and mesic nestling house sparrows reared in low and high humidity and compared our results with previous work on adults. We measured CWL of nestlings and analyzed the lipid composition of the SC using thin-layer chromatography. We showed that nestling house sparrows from both localities had higher CWL than adults in their natural environment, a result of major modifications of the lipid composition of the SC. The expression of plasticity in CWL seems to be a response to opposed selection pressures, thermoregulation and water conservation, at different life stages, on which regulation of CWL plays a crucial role. Desert nestlings showed a greater degree of plasticity in CWL and lipid composition of the SC than did mesic nestlings, a finding consistent with the idea that organisms exposed to more environmental stress ought to be more plastic than individuals living in more benign environments.
机译：表皮的外层，角质层（SC）的细胞间脂质对水蒸气通过皮肤的扩散形成屏障。以前，我们测量了来自两个种群的成年麻雀的皮肤水分流失（CWL）和SC的脂质成分，一个种群生活在沙特阿拉伯的沙漠中，另一个种群生活在中型俄亥俄州。与中型麻雀相比，成年的沙漠麻雀在SC中具有较低的CWL，较低的游离脂肪酸比例以及较高的神经酰胺和脑苷。在这项研究中，我们调查了在低湿度和高湿度下饲养的沙漠和中型雏鸟麻雀中CWL的发育可塑性和SC的脂质组成，并将我们的研究结果与以前在成人身上的工作进行了比较。我们测量了雏鸟的CWL，并使用薄层色谱分析了SC的脂质成分。我们显示，在自然环境中，来自两个地方的雏鸟麻雀的CWL都比成年麻雀高，这是SC脂质成分发生重大变化的结果。 CWL中可塑性的表达似乎是对不同生命周期中相对的选择压力，温度调节和节水的响应，而CWL的调节在其中起着至关重要的作用。沙漠雏鸟比普通雏鸟在SC的CWL和脂类成分中表现出更高的可塑性，这一发现与这样的观点一致，即受到更多环境压力的生物应该比生活在较温和环境中的个体更具塑性。

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