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AMPK is activated early in cerebellar granule cells undergoing apoptosis and influences VADC1 phosphorylation status and activity

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Abstract

The neurodegeneration of cerebellar granule cells, after low potassium induced apoptosis, is known to be temporally divided into an early and a late phase. Voltage-dependent anion channel-1 (VDAC1) protein, changing from the closed inactive state to the active open state, is central to the switch between the early and late phase. It is also known that: (i) VDAC1 can undergo phosphorylation events and (ii) AMP-activated protein kinase (AMPK), the sensor of cellular stress, may have a role in neuronal homeostasis. In the view of this, the involvement of AMPK activation and its correlation with VDAC1 status and activity has been investigated in the course of cerebellar granule cells apoptosis. The results reported in this study show that an increased level of the phosphorylated, active, isoform of AMPK occurs in the early phase, peaks at 3 h and guarantees an increase in the phosphorylation status of VDCA1, resulting in a reduced activity of this latter. However this situation is transient in nature, since, in the late phase, AMPK activation decreases as well as the level of phosphorylated VDAC1. In a less phosphorylated status, VDAC1 fully recovers its gating activity and drives cells along the death route.

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Acknowledgements

The authors thank Mr Gaetano Devito for his skilful technical assistance and Dr A. Storelli for linguistic consultation. This research was supported by: Project FIRB-MERIT—RBNE08HWLZ_012 to M.N.G.

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Authors and Affiliations

  1. Istituto di Biomembrane, Bioenergetica e Biotecnologie Molecolari, CNR, Via Amendola 165/A, 70126, Bari, Italy

    A. Bobba, V. A. Petragallo & A. Atlante

  2. Dipartimento di Medicina Veterinaria, Università di Bari, Bari, Italy

    E. Casalino

  3. Istituto di Farmacologia Traslazionale, CNR, Rome, Italy

    G. Amadoro

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  1. A. Bobba
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  2. E. Casalino
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  3. G. Amadoro
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  4. V. A. Petragallo
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Correspondence to A. Bobba.

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Bobba, A., Casalino, E., Amadoro, G. et al. AMPK is activated early in cerebellar granule cells undergoing apoptosis and influences VADC1 phosphorylation status and activity. Apoptosis 22, 1069–1078 (2017). https://doi.org/10.1007/s10495-017-1389-8

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