RT Journal Article
SR Electronic
T1 Peroxisomes contribute to intracellular calcium dynamics in cardiomyocytes and non-excitable cells
JF Life Science Alliance
JO Life Sci. Alliance
FD Life Science Alliance LLC
SP e202000987
DO 10.26508/lsa.202000987
VO 4
IS 9
A1 Sargsyan, Yelena
A1 Bickmeyer, Uta
A1 Gibhardt, Christine S
A1 Streckfuss-Bömeke, Katrin
A1 Bogeski, Ivan
A1 Thoms, Sven
YR 2021
UL https://www.life-science-alliance.org/content/4/9/e202000987.abstract
AB Peroxisomes communicate with other cellular compartments by transfer of various metabolites. However, whether peroxisomes are sites for calcium handling and exchange has remained contentious. Here we generated sensors for assessment of peroxisomal calcium and applied them for single cell-based calcium imaging in HeLa cells and cardiomyocytes. We found that peroxisomes in HeLa cells take up calcium upon depletion of intracellular calcium stores and upon calcium influx across the plasma membrane. Furthermore, we show that peroxisomes of neonatal rat cardiomyocytes and human induced pluripotent stem cell–derived cardiomyocytes can take up calcium. Our results indicate that peroxisomal and cytosolic calcium signals are tightly interconnected both in HeLa cells and in cardiomyocytes. Cardiac peroxisomes take up calcium on beat-to-beat basis. Hence, peroxisomes may play an important role in shaping cellular calcium dynamics of cardiomyocytes.