Abstract:
:Proper functioning of organelles such as the ER or the Golgi apparatus requires luminal accumulation of Ca(2+) at high concentrations. Here we describe a ratiometric low-affinity Ca(2+) sensor of the GFP-aequorin protein (GAP) family optimized for measurements in high-Ca(2+) concentration environments. Transgenic animals expressing the ER-targeted sensor allowed monitoring of Ca(2+) signals inside the organelle. The use of the sensor was demonstrated under three experimental paradigms: (1) ER Ca(2+) oscillations in cultured astrocytes, (2) ex vivo functional mapping of cholinergic receptors triggering ER Ca(2+) release in acute hippocampal slices from transgenic mice, and (3) in vivo sarcoplasmic reticulum Ca(2+) dynamics in the muscle of transgenic flies. Our results provide proof of the suitability of the new biosensors to monitor Ca(2+) dynamics inside intracellular organelles under physiological conditions and open an avenue to explore complex Ca(2+) signaling in animal models of health and disease.
journal_name
Cell Chem Bioljournal_title
Cell chemical biologyauthors
Navas-Navarro P,Rojo-Ruiz J,Rodriguez-Prados M,Ganfornina MD,Looger LL,Alonso MT,García-Sancho Jdoi
10.1016/j.chembiol.2016.05.010subject
Has Abstractpub_date
2016-06-23 00:00:00pages
738-45issue
6eissn
2451-9456issn
2451-9448pii
S2451-9456(16)30163-5journal_volume
23pub_type
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