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HSPB5 (αB-crystallin) confers protection against paraquat-induced oxidative stress at the organismal level in a tissue-dependent manner

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Cell Stress and Chaperones Aims and scope

Abstract

Oxidative stress is one of the major and continuous stresses, an organism encounters during its lifetime. Tissues such as the brain, liver and muscles are more prone to damage by oxidative stress due to their metabolic activity, differences in physiological and adaptive processes. One of the defence mechanisms against continuous oxidative stress is a set of small heat shock proteins. αB-Crystallin/HSPB5, a small heat shock protein, gets upregulated under stress and acts as a molecular chaperone. In addition to acting as a molecular chaperone, HSPB5 is shown to have a role in other cytoprotective functions such as inhibition of apoptosis, prevention of oxidative stress and stabilisation of cytoskeletal system. Such protection in vivo, at the organism level, particularly in a tissue-dependent manner, has not been investigated. We have expressed HSPB5 in fat body (liver), neurons and specifically in dopaminergic and motor neurons in Drosophila and investigated its protective effect against paraquat-induced oxidative stress. We observed that expression of HSPB5 in neurons and fat body confers protection against paraquat-induced oxidative stress. Expression in dopaminergic neurons showed a higher protective effect. Our results clearly establish the protective ability of HSPB5 in vivo; the extent of protection, however, varies depending on the tissue in which it is expressed. Interestingly, neuronal expression of HSPB5 resulted in an improvement in negative geotropic behaviour, whereas specific expression in muscle tissue did not show such a beneficial effect.

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Abbreviations

HSP:

Heat shock protein

sHsp:

Small heat shock protein

NTD:

N-terminal domain

ACD:

Alpha crystallin domain

CTE:

C-terminal extension

ALS:

Amyotrophic lateral sclerosis

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Acknowledgements

We thank Dr. Rakesh Kumar Mishra for his help with the fly experiments. We thank Dr. T. Ramakrishna Murti for critical reading of the manuscript.

Funding

CMR is a recipient of Sir JC Bose National Fellowship of the SERB, DST (Government of India). PB is a recipient of the Council of Scientific and Industrial Research, New Delhi, senior research fellowship.

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Correspondence to Ch. Mohan Rao.

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Budnar, P., Singh, N.P. & Rao, C.M. HSPB5 (αB-crystallin) confers protection against paraquat-induced oxidative stress at the organismal level in a tissue-dependent manner. Cell Stress and Chaperones 26, 229–239 (2021). https://doi.org/10.1007/s12192-020-01171-4

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  • DOI: https://doi.org/10.1007/s12192-020-01171-4

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