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Seasonal and elevational variation in glucose and glycogen in two songbird species.
Comparative Biochemistry and Physiology A: Molecular & Integrative Physiology ( IF 2.1 ) Pub Date : 2020-04-10 , DOI: 10.1016/j.cbpa.2020.110703 Karen L Sweazea 1 , Krystal S Tsosie 2 , Elizabeth J Beckman 3 , Phred M Benham 3 , Christopher C Witt 4
Comparative Biochemistry and Physiology A: Molecular & Integrative Physiology ( IF 2.1 ) Pub Date : 2020-04-10 , DOI: 10.1016/j.cbpa.2020.110703 Karen L Sweazea 1 , Krystal S Tsosie 2 , Elizabeth J Beckman 3 , Phred M Benham 3 , Christopher C Witt 4
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Birds naturally maintain high glucose concentrations in the blood and tissues, even when relying on fat to meet the metabolic demands of flight or thermogenesis. One possibility is that high glucose levels might be needed to deal with these metabolic demands. Thus, we hypothesized that birds chronically exposed to colder temperatures and higher elevations have higher circulating glucose and tissue free glucose and glycogen compared to conspecifics living at warmer temperatures and lower elevations. Adult House Sparrows (Passer domesticus) and House Finches (Haemorhous mexicanus) were captured from Phoenix, AZ (340 m elevation), and Albuquerque, NM (1600 m elevation), during the summer and winter months. We measured plasma glucose, as well as free glucose and glycogen from multiple tissues. In general, high elevation and colder temperatures were associated with higher tissue glycogen and higher free glucose concentrations in the brain. These findings indicate that glucose and glycogen are subject to seasonal phenotypic flexibility as well as geographic variations that may relate to local food availability and abundance.
中文翻译：
两种鸣禽中葡萄糖和糖原的季节性和海拔变化。
即使依靠脂肪来满足飞行或生热的代谢需求，鸟类自然也会在血液和组织中保持较高的葡萄糖浓度。一种可能性是可能需要高葡萄糖水平来应对这些代谢需求。因此，我们假设与生活在较高温度和较低海拔下的同种异体相比，长期暴露于较低温度和较高海拔下的鸟类具有较高的循环葡萄糖和组织游离葡萄糖和糖原。在夏季和冬季，分别从亚利桑那州凤凰城（海拔340 m）和新墨西哥州阿尔伯克基（海拔1600 m）捕获成年麻雀（Passer domesticus）和雀（Haemorhous mexicanus）。我们测量了血浆葡萄糖，以及来自多个组织的游离葡萄糖和糖原。一般来说，高海拔和低温会导致大脑中更高的组织糖原和更高的游离葡萄糖浓度。这些发现表明，葡萄糖和糖原具有季节性表型灵活性以及可能与当地食物供应量和丰度有关的地理差异。
更新日期：2020-04-20
中文翻译：
两种鸣禽中葡萄糖和糖原的季节性和海拔变化。
即使依靠脂肪来满足飞行或生热的代谢需求，鸟类自然也会在血液和组织中保持较高的葡萄糖浓度。一种可能性是可能需要高葡萄糖水平来应对这些代谢需求。因此，我们假设与生活在较高温度和较低海拔下的同种异体相比，长期暴露于较低温度和较高海拔下的鸟类具有较高的循环葡萄糖和组织游离葡萄糖和糖原。在夏季和冬季，分别从亚利桑那州凤凰城（海拔340 m）和新墨西哥州阿尔伯克基（海拔1600 m）捕获成年麻雀（Passer domesticus）和雀（Haemorhous mexicanus）。我们测量了血浆葡萄糖，以及来自多个组织的游离葡萄糖和糖原。一般来说，高海拔和低温会导致大脑中更高的组织糖原和更高的游离葡萄糖浓度。这些发现表明，葡萄糖和糖原具有季节性表型灵活性以及可能与当地食物供应量和丰度有关的地理差异。
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