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Intra-arterial Stem Cell Therapy Diminishes Inflammasome Activation After Ischemic Stroke: a Possible Role of Acid Sensing Ion Channel 1a

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A Correction to this article was published on 01 January 2021

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Abstract

Studies from our lab demonstrated that 1 × 105 intra-arterial mesenchymal stem cells (IA MSCs) at 6 h following ischemic stroke are efficacious owing to its maximum homing due to elevated stromal derived factor 1 (SDF1) in the tissue. Further, IA MSCs could abate the infarct progression, improve functional outcome, and decrease expression of calcineurin by modifying neuronal Ca2+ channels following ischemic stroke. Since stroke pathology also encompasses acidosis that worsens the condition; hence, the role of acid sensing ion channels (ASICs) in this context could not be overlooked. ASIC1a being the major contributor towards acidosis triggers Ca2+ ions overload which progressively contributes towards exacerbation of neuronal injury following ischemic insult. Inflammasome involvement in ischemic stroke is well reported as activated ASIC1a increases the expression of inflammasome in a pH-dependent manner to trigger inflammatory cascade. Hence, the current study aimed to identify if IA MSCs can decrease the production of inflammasome by attenuating ASIC1a expression to render neuroprotection. Ovariectomized Sprague Dawley (SD) rats exposed to middle cerebral artery occlusion (MCAo) for 90 min were treated with phosphate-buffered saline (PBS) or 1 × 105 MSCs IA at 6 h to check for the expression of ASIC1a and inflammasome in different groups. Inhibition studies were carried out to explore the underlying mechanism. Our results demonstrate that IA MSCs improves functional outcome and oxidative stress parameters, and decreases the expression of ASIC1a and inflammasomes in the cortical brain region after ischemic stroke. This study offers a preliminary evidence of the role of IA MSCs in regulating inflammasome by modulating ASIC1a.

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Change history

  • 01 January 2021

    It has come to our notice that there was an inadvertent misupload of Fig. 2 (c, d) in the loading control (GAPDH) for ASIC1a and NLRP1 blots. We would like to replace the same with the correct image. This change anyhow does not affect the conclusion of the study. However, the use of GAPDH as a loading control for stroke studies sometimes is debatable (Zhai et al. 2014; Kang et al. 2018). Hence, we repeated our experiments to check the expression of ASIC1a and NLRP1 at different time points following stroke, using beta actin as a loading control. We found that at 24 h post stroke, maximal and significant expression of both ASIC1a and NLRP1 was observed (Fig. 2 e, f). The expression at 48 and 72 h post stroke were not significantly different as compared to that of sham. The expression results obtained using beta actin as a loading control were concurrent with the previous results published with GAPDH as a loading control.

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Funding

Authors acknowledge International Society for Neurochemistry (ISN) Return Home grant, Department of Pharmaceuticals, Ministry of Chemical and Fertilizers, Govt. of India, and National Institute of Pharmaceutical Education and Research (NIPER) Ahmedabad, Gandhinagar, India.

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Correspondence to Pallab Bhattacharya.

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Animal experimentation was performed as per the stated guidelines in Guide for the Care and Use of Laboratory Animals published by the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA). The Institutional Animal Ethical Committee of NIPER-Ahmedabad approved the experimental protocol (NIPERA/IAEC/2017/005).

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Vats, K., Sarmah, D., Datta, A. et al. Intra-arterial Stem Cell Therapy Diminishes Inflammasome Activation After Ischemic Stroke: a Possible Role of Acid Sensing Ion Channel 1a. J Mol Neurosci 71, 419–426 (2021). https://doi.org/10.1007/s12031-019-01460-3

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