期刊
CELLS
卷 9, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/cells9051129
关键词
ultrasound; calcium oscillations; pancreatic beta-cells; purinergic signaling; hemichannels; ATP
类别
资金
- National Institutes of Health [P41-EB002182]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT, Korea (MIST) [2018R1D1A1A02085904]
- National Research Foundation of Korea [2018R1D1A1A02085904] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In glucose-stimulated insulin secretion (GSIS) of pancreatic beta -cells, the rise of free cytosolic Ca2+ concentration through voltage-gated calcium channels (VGCCs) triggers the exocytosis of insulin-containing granules. Recently, mechanically induced insulin secretion pathways were also reported, which utilize free cytosolic Ca2+ ions as a direct regulator of exocytosis. In this study, we aimed to investigate intracellular Ca2+ responses on the HIT-T15 pancreatic beta -cell line upon low-intensity pulsed ultrasound (LIPUS) stimulation and found that ultrasound induces two distinct types of intracellular Ca2+ oscillation, fast-irregular and slow-periodic, from otherwise resting cells. Both Ca2+ patterns depend on the purinergic signaling activated by the rise of extracellular ATP or ADP concentration upon ultrasound stimulation, which facilitates the release through mechanosensitive hemichannels on the plasma membrane. Further study demonstrated that two subtypes of purinergic receptors, P2X and P2Y, are working in a competitive manner depending on the level of glucose in the cell media. The findings can serve as an essential groundwork providing an underlying mechanism for the development of a new therapeutic approach for diabetic conditions with further validation.
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