NDLI: Temperature Dependence of IP3-Mediated Local and Global Ca2+ Signals

Content Provider	PubMed Central
Author	Dickinson, GeorgeÂ d. Parker, Ian
Copyright Year	2013
Abstract	We examined the effect of temperature (12–40°C) on local and global Ca2+ signals mediated by inositol trisphosphate receptor/channels (IP3R) in human neuroblastoma (SH-SY5Y) cells. The amplitudes and spatial spread of local signals arising from single IP3R (blips) and clusters of IP3R (puffs) showed little temperature dependence, whereas their kinetics (durations and latencies) were markedly accelerated by increasing temperature. In contrast, the amplitude of global Ca2+ waves increased appreciably at lower temperatures, probably as a result of the longer duration of IP3R channel opening. Several parameters, including puff and blip durations, puff latency and frequency, and frequency of repetitive Ca2+ waves, showed a biphasic temperature dependence on Arrhenius plots. In all cases the transition temperature occurred at ∼25°C, possibly reflecting a phase transition in the lipids of the endoplasmic reticulum membrane. Although the IP3-evoked Ca2+ signals were qualitatively similar at 25°C and 36°C, one should consider the temperature sensitivity of IP3-mediated signal amplitudes when extrapolating from room temperature to physiological temperature. Conversely, further cooling may be advantageous to improve the optical resolution of channel gating kinetics.
Related Links	http://dx.doi.org/10.1016/j.bpj.2012.12.024
Ending Page	395
Page Count	10
Starting Page	386
File Format	PDF
ISSN	15420086
e-ISSN	15420086
Journal	Biophysical Journal
Issue Number	2
Volume Number	104
Language	English
Publisher	The Biophysical Society
Publisher Date	2013-01-22
Access Restriction	Open
Rights Holder	The Biophysical Society
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biophysics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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