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Mitochondria are clustered around the replication sites of several viruses and decrease the supply routes for energy and metabolites, resulting in increased viral progeny viruses. In a viral infection, viruses generate cellular stress, which causes mitochondrial redistribution.
The mitochondrial dynamics network involves two cycles, mitochondrial fission and Mitochondrial Fusion, to help maintain the functional capacity of mitochondria by distribution of mitochondrial contents, energy conductance, and responsiveness to cellular cues. Thus, mitochondrial dynamics govern their communication and interaction with other cellular organelles.
By balancing between two opposite processes, mitochondrial fission and fusion, mammalian cells maintain the overall shapes of their mitochondria. The Fis1 protein has a TM domain with the help of the C-terminal of mitochondria anchored into the mitochondrial outer membrane [1]. Drp1 does not prevent localized mitochondria via the knockdown of Fis1 with RNA interference [2]. By network lengthening, MFF release the Drp1 foci from the mitochondrial outer membrane, whereas, with the help of mitochondrial fission and the physical interaction between the mitochondrial fission factor (MFF) and Drp1, MFF overexpression stimulates mitochondrial fission [3].
Mitochondrial fission includes Drp1 and Fis1, whereas mitochondrial fusion includes Mfn1, Mfn2, and OPA1. The deletion of the Drp1 gene causes mitochondrial enlargement, the increased opening of the mitochondrial permeability transition pore (MPTP), apoptosis, and lethal dilated cardiomyopathy (DCM) [4] by inhibiting mitochondrial fission, whereas deletion of Mfn1 and Mfn2 disrupts mitochondrial structure and respiratory chain function [5]. An imbalance between mitochondrial fusion and fission compromises mitochondrial integrity during aging [6][7][8]. Mitochondrial from aged C. elegans is indicated by a significantly enlarged and swollen ultrastructure, which is accompanied by decreasing O2 consumption, increasing carbonylated proteins and decreasing mitochondrial SOD activity [9].
In healthy mitochondria, PINK1 contains a mitochondrial target sequence (MTS), which translocates to mitochondria and is imported to the IMM by translocase of the outer mitochondrial membrane (OMM) and inner mitochondrial membrane (TIM). Following this, PINK1 is degraded by downstream proteolytic events.
Therapeutic Category | Mechanism of Action | ||||||
---|---|---|---|---|---|---|---|
Autophagy | UPR stress | MPTP | NLRP3 Inflammasome | ||||
Activator | Modulator | Inhibitor | Suppressor | Modulator | Modulator | Inhibitor | |
Immunosuppressant | Rapamycin, Tacrolimus, Everolimus [49] | Cyclosporin A [50][51] | |||||
Anticancer | Rapamycin, Tersirolimus, Everolimus [49], Gefitinib [52], Temozolomide [52] | Bortezomib, Celecoxib [52] | Sunitinib [53] | Thalidomide [54] | |||
Antidiabetic | Metformin [49] | Pioglitazone [53], Exenatide, Vildagliptin [55], Berberine [56] | Liraglutide [56] | Glyburide [54][57] | |||
Dietary supplement | Trehalose, Resveratro l [49] | Curcumin [53] | Quercetin [58] | ||||
Antipsychotic | Lithium [49], Fluspirilene, Trifluperazine, Pimozide [59], Bromperidol, Chlorpromazine [60][61], Sertindole, Olanzapine, Fluphenazine, Methotrimeprazine [62], Prochlorperazine [61] | Clozapine [62] | Haloperidol [63][64][65], Etifoxine [66][67] | ||||
Antiepileptic | Carbamazepine, Sodium valproate [49] | ||||||
Antihypertensive | Verapamil, Nimodipine, Nitrendipine [49], Nicardipine, Amidarone [59], Rilmenidine, Clonidine [68], Minoxidil [60] | Isoproterenol [53], Valsartan, Lowsartan, Olmesartan, Telmisartan [55], Guanabenz [69], Bisoprolol, Propranolol, Metoprolol [56] | Ifenprodil [63][64][65], Diazoxide, Nicorandil, Tadalafil, Perhaxiline, Carvedilol [50][51] | ||||
Antidiarrheal | Loperamide [59] | ||||||
Ca+ regulator | Calcifediol [68] | ||||||
Anti-infective | Nitazoxanide [68] | ||||||
Antidepressant | Nortriptyline [68] | Clomipramine [60] | Trazodone [70] | ||||
AnticholesteremiC agent | Simvastatin [67] | Atorvastatin [56] | |||||
Antiemetic | Chlorpromazine [60][61], Prochlorperazine [61] | Haloperidol [63][64][65] | Thalidomide [54] | ||||
Minercorticoid replacement agent | Fludraocortisone [60][61] | ||||||
Antitussive | Noscapine [60][61] | Carbetapentane, Dextromethorphan [63][64][65] | |||||
Anti-allergic | Clemastine [60] | ||||||
Chelating agent | Defeiprone [71] | ||||||
Antihelmintic | Niclosamide [72] | Quimacrine [73][74] | |||||
Skeletal muscle relaxant | Baclofen [75] | ||||||
Gastrointestinal | Pantoprazole [52] | ||||||
Macrolide antibiotic | Azithromycin [60] | ||||||
Ocular drug | Verteporfin [60] | ||||||
Antiprotozoal drug | Quimacrine [73][74], Chloroquine, Hydroxychloroquine [68] | ||||||
Urea cycle disorder agent | Thenylbutyrate [52][53] | ||||||
Hypolipidemic agent | Pravastatin [53], Fenofibrate [55] | ||||||
Anti-Alzheimer’s | Donepeziol [63][64][65] | ||||||
Anti-Parkinsonian | Pramipexole [76] | ||||||
Neuroprotective agent; anti-ALS drug | Edaravone [50][77] | ||||||
Anti-arthritic | Anakinra [54] | ||||||
Anti-inflammatory agent | Celecoxib [52] | Anakinra [54], Tranilast [54][78] | |||||
Anti-insomia agent | Melatonin [79] |
Mitochondria are membrane-bound cell organelles which produce energy in the form of adenosine triphosphate (ATP) as well as regulating various intracellular functions like metabolism, bioenergetics, cell death, innate immune signaling, and cellular homeostasis. Mitochondria are self-governed by mitochondrial dynamics and mitochondria-selective autophagy or mitophagy. During infection, viruses altered mitochondrial dynamics in order to modulate mitochondria-mediated antiviral immune responses via the alteration of mitochondrial events such as autophagy, mitophagy, and cellular metabolism to facilitate their proliferation.
The pro-fission protein of SRV2 activates mitochondrial fission via the loss of MMP, the ROS-overloading suppression antioxidant system, the depletion of cellular ATP, the release of the apoptotic factor, the activation of the caspase family, and NLRP3 inflammasomes. The protein SRV2 also promotes mitochondria-associated cardiomyocyte apoptosis to cause cardiomyocyte death and mitochondrial damage. The World Health Organization reported that most repositioned drugs modulators, under clinical investigation against COVID-19, act through different pathways such as UPR, autophagy, the NLRP3 inflammasome, and mitochondrial permeability transition pores (MPTP) to inhibit SARS-COV2 propagation. Analysis of the functional significance of mitochondrial dynamics and viral pathogenesis will open up new possibilities for the therapeutic design of approaches to combat viral infections and associated diseases.