嘌呤能受体
细胞外
嘌呤能信号
细胞生物学
生物
三磷酸腺苷
受体
P2Y受体
自分泌信号
P2受体
化学
生物化学
腺苷受体
兴奋剂
作者
Lucia Seminario‐Vidal,Eduardo R. Lazarowski,Seiko F. Okada
出处
期刊:Methods in molecular biology
日期:2009-01-01
卷期号:: 25-36
被引量:27
标识
DOI:10.1007/978-1-60327-321-3_3
摘要
Most cells release ATP to the extracellular milieu. Extracellular ATP plays important signaling roles by activating a score of broadly distributed cell surface purinergic receptors (purinoceptors). Biological responses regulated by purinergic receptors include neurotransmission, smooth muscle relaxation and contraction, epithelial cell ion transport, inflammation, platelet activation, immune responses, cardiac function, endocrine and exocrine secretion, glucose transport, and cell proliferation. ATP concentrations at the cell surface, and consequently the magnitude of purinergic receptor stimulation, reflect a well-controlled balance between rates of ATP release and extracellular metabolism. Given the broad spectrum of responses triggered by extracellular ATP, there is a growing interest in accurately assessing the concentrations of this nucleotide at the cell surface. In this chapter, we discuss the use of the luciferin/luciferase-based reaction to measure extracellular ATP concentrations with high sensitivity. Protocols are adapted to assess ATP levels either in sampled extracellular fluids or in situ at the cell surface. Although our focus is on studies of ATP release from epithelial cells, protocols described here are applicable to practically all cell types.
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