Premium
Chronic pharmacological blockade of the Na + /Ca 2+ exchanger modulates the growth and development of the Purkinje cell dendritic arbor in mouse cerebellar slice cultures
Author(s) -
Sherkhane Pradeep,
Kapfhammer Josef P.
Publication year - 2017
Publication title -
european journal of neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.346
H-Index - 206
eISSN - 1460-9568
pISSN - 0953-816X
DOI - 10.1111/ejn.13649
Subject(s) - bepridil , cerebellum , purkinje cell , antiporter , chemistry , microbiology and biotechnology , neuroscience , calcium , sodium calcium exchanger , blockade , homeostasis , calbindin , biology , biochemistry , receptor , membrane , verapamil , organic chemistry
The Na + /Ca 2+ exchanger ( NCX ) is a bidirectional plasma membrane antiporter involved in Ca 2+ homeostasis in eukaryotes. NCX has three isoforms, NCX 1–3, and all of them are expressed in the cerebellum. Immunostaining on cerebellar slice cultures indicates that NCX is widely expressed in the cerebellum, including expression in Purkinje cells. The pharmacological blockade of the forward mode of NCX (Ca 2+ efflux mode) by bepridil moderately inhibited growth and development of Purkinje cell dendritic arbor in cerebellar slice cultures. However, the blockade of the reverse mode (Ca 2+ influx mode) by KB ‐R7943 severely reduced the dendritic arbor and induced a morphological change with thickened distal dendrites. The effect of KB ‐R7943 on dendritic growth was unrelated to the activity of voltage‐gated calcium channels and was also apparent in the absence of bioelectrical activity indicating that it was mediated by NCX expressed in Purkinje cells. We have used additional NCX inhibitors including CB ‐ DMB , ORM ‐10103, SEA 0400, YM ‐244769, and SN ‐6 which have higher specificity for NCX isoforms and target either the forward, reverse, or both modes. These inhibitors caused a strong dendritic reduction similar to that seen with KB ‐R7943, but did not elicit thickening of distal dendrites. Our findings indicate that disturbance of the NCX ‐dependent calcium transport in Purkinje cells induces a reduction of dendritic arbor, which is presumably caused by changes in the calcium handling, and underline the importance of the calcium equilibrium for the dendritic development in cerebellar Purkinje cells.