GFP-Aequorin Protein Sensor for Ex Vivo and In Vivo Imaging of Ca(2+) Dynamics in High-Ca(2+) Organelles.

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 Biol

journal_title

Cell chemical biology

authors

Navas-Navarro P,Rojo-Ruiz J,Rodriguez-Prados M,Ganfornina MD,Looger LL,Alonso MT,García-Sancho J

doi

10.1016/j.chembiol.2016.05.010

subject

Has Abstract

pub_date

2016-06-23 00:00:00

pages

738-45

issue

6

eissn

2451-9456

issn

2451-9448

pii

S2451-9456(16)30163-5

journal_volume

23

pub_type

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