索马托斯坦素受体亚型的分布和信号功能在老鼠垂体体内
Sonja Sivcev1, Stephanie Constantin1, Kosara Smiljanic1
1Section on Cellular Signaling, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda. USA.
Cell calcium
|November 10, 2024
概括
pituitary 细胞中的 somatostatin (SST) 受体通过调节电活动和信号来控制激素分泌. SST独特地影响不同类型的垂体细胞,影响激素释放和刺激能力.
科学领域:
- 内分泌学 在内分泌学.
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
背景情况:
- 索马托斯坦素 (SST) 受体家族调节垂体腺体激素分泌.
- 精确的分布和SST受体在垂体细胞刺激性和信号传递上的功能尚未完全理解.
研究的目的:
- 描述大鼠垂体内索马托斯坦素受体基因 (Sstr1-5) 细胞类型特定表达的特征.
- 研究SST对不同类型的垂体细胞的电活动,电压导入信号和激素分泌的影响.
主要方法:
- 在特定的垂体细胞群中对Sstr基因表达的定量分析.
- 电子生理学记录 (作用电位,过渡物) 作为对SST应用的反应.
- 通过SST对GPCR诱导的信号传递和激素分泌抑制的评估.
主要成果:
- SST受体在甲状腺细胞,淋巴细胞,乳腺细胞和体质细胞中表现出明显的细胞类型特异性表达模式;皮质细胞和黑色细胞缺乏这些受体.
- 在没有改变细胞内的情况下,SST沉默了淋巴细胞和甲状腺细胞的自发作用潜力.
- 在乳营养菌和体营养菌中,SST降低了平原破裂作用潜力和过渡物.
- 在所有受体表达细胞中,SST抑制了GPCR诱导的信号传递和激素分泌,在体培细胞中效果更大.
- 抑制涉及电压关闭通道的直接/间接调制和细胞类型特定的超极化.
结论:
- 多个SST受体亚型和缓慢的脱敏增强SST在体育的作用.
- SST可能会同步淋巴细胞,乳腺细胞和乳腺细胞的电活动.
- 缺少SST受体维持了皮质细胞和黑色细胞对应激反应的兴奋性.
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