期刊
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
卷 -, 期 175, 页码 -出版社
JOURNAL OF VISUALIZED EXPERIMENTS
DOI: 10.3791/62347
关键词
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资金
- Center for Regenerative Therapies Dresden at TU Dresden
- German Center for Diabetes Research (DZD)
- German Research Foundation (DFG)
- International Research Training Group [IRTG 2251]
- Immunological and Cellular Strategies in Metabolic Disease
This study successfully investigated beta-cell function in vivo using the optical transparency of zebrafish larvae, revealing the response of beta-cells to glucose stimulation in terms of Ca2+ influx. It is important for understanding how environmental and genetic factors affect beta-cell function.
The pancreatic beta-cells sustain systemic glucose homeostasis by producing and secreting insulin according to the blood glucose levels. Defects in beta-cell function are associated with hyperglycemia that can lead to diabetes. During the process of insulin secretion, beta-cells experience an influx of Ca2+. Thus, imaging the glucose-stimulated Ca2+ influx using genetically encoded calcium indicators (GECIs) provides an avenue to studying beta-cell function. Previously, studies showed that isolated zebrafish islets expressing GCaMP6s exhibit significant Ca2+ activity upon stimulation with defined glucose concentrations. However, it is paramount to study how beta-cells respond to glucose not in isolation, but in their native environment, where they are systemically connected, vascularized, and densely innervated. To this end, the study leveraged the optical transparency of the zebrafish larvae at early stages of development to illuminate beta-cell activity in vivo. Here, a detailed protocol for Ca2+ imaging and glucose stimulation to investigate beta-cell function in vivo is presented. This technique allows to monitor the coordinated Ca2+ dynamics in beta-cells with single-cell resolution. Additionally, this method can be applied to work with any injectable solution such as small molecules or peptides. Altogether, the protocol illustrates the potential of the zebrafish model to investigate islet coordination in vivo and to characterize how environmental and genetic components might affect beta-cell function.
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