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Kara SC, Canpolat U. Telmisartan-Induced Myotoxicity in Patients with Essential Hypertension. Turk Kardiyol Dern Ars 2024; 52:217-219. [PMID: 38573089 DOI: 10.5543/tkda.2023.22893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2024] Open
Abstract
Drug-related muscular adverse effects are relatively common among certain groups of drugs, such as statins and steroids. However, these adverse effects are less well-known for angiotensin receptor blockers (ARBs). It is proposed that telmisartan and irbesartan may cause myotoxicity via increased Peroxisome Proliferator-Activated Receptor gamma (PPAR-gamma) activity. Herein, we present two hypertensive patients in whom telmisartan-induced myotoxicity was observed. Therefore, physicians should be aware that telmisartan, along with some other ARBs, can also cause myopathy. Possible drug-drug interactions should be considered in cases of concomitant prescription of these agents with other myopathic drugs.
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Affiliation(s)
- Süleyman Cihan Kara
- Department of Cardiology, Hacettepe University Faculty of Medicine, Ankara, Türkiye
| | - Uğur Canpolat
- Department of Cardiology, Hacettepe University Faculty of Medicine, Ankara, Türkiye
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2
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Unal M, Gumus N, Guzel N, Tulgar S, Koksal E, Suren M. Follow-up of Serum Creatine Phosphokinase Levels after Ultrasound Guided Suprainguinal Fascia Iliaca Block with Bupivacaine in Total Knee Arthroplasty Patients: An Observational, Controlled Study. J Coll Physicians Surg Pak 2024; 34:256-261. [PMID: 38462857 DOI: 10.29271/jcpsp.2024.03.256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 02/26/2024] [Indexed: 03/12/2024]
Abstract
OBJECTIVE To determine the myotoxicity of bupivacaine on muscles after suprainguinal fascia iliaca block for postoperative analgesia in total knee arthroplasty (TKA) patients through changes in serum creatine phosphokinase (CPK) levels during the perioperative period. STUDY DESIGN Observational study. Place and Duration of the Study: Postoperative Recovery Room department of Anaesthesiology and Reanimation, Samsun University, Samsun, Training and Research Hospital, Samsun, Turkiye, between December 2022 and February 2023. METHODOLOGY Patients undergoing for the procedure of TKA surgery were recruited. (40 controls and 42 SIFIB groups). Serum CPK levels were evaluated preoperatively, at postoperative 6th hour and 24th hour. RESULTS From total 82 patients, 42 of them who received SIFIB as a component of multimodal analgesia had serum CPK levels comparable to those in the control group at all time points (p>0.05). While the increase in CPK level at 6th hour relative to baseline was significant in both groups (p<0.05), only the block group demonstrated a statistically significant difference between the 6th and 24th hours (p<0.05). CONCLUSION SIFIB administration did not result in severe bupivacaine-induced myotoxicity in comparison to the control group. SIFIB administration is a safe option when used as part of multimodal analgesia in TKA. KEY WORDS Bupivacaine, Creatine phosphokinase, Myotoxicity, Regional anaesthesia.
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Affiliation(s)
- Murat Unal
- Department of Anaesthesiology and Reanimation, Samsun University, Samsun Training and Research Hospital, Samsun, Turkiye
| | - Nevzat Gumus
- Department of Anaesthesiology and Reanimation, Samsun University, Samsun Training and Research Hospital, Samsun, Turkiye
| | - Nizamettin Guzel
- Department of Orthopaedics and Traumatology, Samsun University, Samsun Training and Research Hospital, Samsun, Turkiye
| | - Serkan Tulgar
- Department of Anaesthesiology and Reanimation, Samsun University, Samsun Training and Research Hospital, Samsun, Turkiye
| | - Ersin Koksal
- Department of Anaesthesiology and Reanimation, Ondokuz Mayis University, Samsun, Turkiye
| | - Mustafa Suren
- Department of Anaesthesiology and Reanimation, Samsun University, Samsun Training and Research Hospital, Samsun, Turkiye
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de Oliveira ALN, Lacerda MT, Ramos MJ, Fernandes PA. Viper Venom Phospholipase A2 Database: The Structural and Functional Anatomy of a Primary Toxin in Envenomation. Toxins (Basel) 2024; 16:71. [PMID: 38393149 PMCID: PMC10893444 DOI: 10.3390/toxins16020071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 01/04/2024] [Accepted: 01/13/2024] [Indexed: 02/25/2024] Open
Abstract
Viper venom phospholipase A2 enzymes (vvPLA2s) and phospholipase A2-like (PLA2-like) proteins are two of the principal toxins in viper venom that are responsible for the severe myotoxic and neurotoxic effects caused by snakebite envenoming, among other pathologies. As snakebite envenoming is the deadliest neglected tropical disease, a complete understanding of these proteins' properties and their mechanisms of action is urgently needed. Therefore, we created a database comprising information on the holo-form, cofactor-bound 3D structure of 217 vvPLA2 and PLA2-like proteins in their physiologic environment, as well as 79 membrane-bound viper species from 24 genera, which we have made available to the scientific community to accelerate the development of new anti-snakebite drugs. In addition, the analysis of the sequenced, 3D structure of the database proteins reveals essential aspects of the anatomy of the proteins, their toxicity mechanisms, and the conserved binding site areas that may anchor universal interspecific inhibitors. Moreover, it pinpoints hypotheses for the molecular origin of the myotoxicity of the PLA2-like proteins. Altogether, this study provides an understanding of the diversity of these toxins and how they are conserved, and it indicates how to develop broad, interspecies, efficient small-molecule inhibitors to target the toxin's many mechanisms of action.
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Affiliation(s)
| | | | | | - Pedro A. Fernandes
- Requimte-Faculty of Sciences, University of Porto, Rua do Campo Alegre s/n, 4169-000 Porto, Portugal; (A.L.N.d.O.); (M.T.L.); (M.J.R.)
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Adverse effects of systemic cancer therapy on skeletal muscle: myotoxicity comes out of the closet: Erratum. Curr Opin Clin Nutr Metab Care 2023; 26:570. [PMID: 37807959 DOI: 10.1097/MCO.0000000000000985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
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Zukifli NA, Ibrahim Z, Othman I, Ismail AK, Chaisakul J, Hodgson WC, Ahmad Rusmili MR. In Vitro neurotoxicity and myotoxicity of Malaysian Naja sumatrana and Naja kaouthia venoms: Neutralization by monovalent and Neuro Polyvalent Antivenoms from Thailand. PLoS One 2022; 17:e0274488. [PMID: 36094937 PMCID: PMC9467353 DOI: 10.1371/journal.pone.0274488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 08/29/2022] [Indexed: 12/02/2022] Open
Abstract
Naja sumatrana and Naja kaouthia are medically important elapids species found in Southeast Asia. Snake bite envenoming caused by these species may lead to morbidity or mortality if not treated with the appropriate antivenom. In this study, the in vitro neurotoxic and myotoxic effects N. sumatrana and N. kaouthia venoms from Malaysian specimens were assessed and compared. In addition, the neutralizing capability of Cobra Antivenom (CAV), King Cobra Antivenom (KCAV) and Neuro Polyvalent Antivenom (NPAV) from Thailand were compared. Both venoms produced concentration-dependent neurotoxic and myotoxic effects in the chick biventer cervicis nerve-muscle preparation. Based on the time to cause 90% inhibition of twitches (i.e. t90) N. kaouthia venom displayed more potent neurotoxic and myotoxic effects than N. sumatrana venom. All three of the antivenoms significantly attenuated venom-induced twitch reduction of indirectly stimulated tissues when added prior to venom. When added after N. sumatrana venom, at the t90 time point, CAV and NPAV partially restored the twitch height but has no significant effect on the reduction in twitch height caused by N. kaouthia venom. The addition of KCAV, at the t90 time point, did not reverse the attenuation of indirectly stimulated twitches caused by either venom. In addition, none of the antivenoms, when added prior to venom, prevented attenuation of directly stimulated twitches. Differences in the capability of antivenoms, especially NPAV and CAV, to reverse neurotoxicity and myotoxicity indicate that there is a need to isolate and characterize neurotoxins and myotoxins from Malaysian N. kaouthia and N. sumatrana venoms to improve neutralization capability of the antivenoms.
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Affiliation(s)
- Nor Asyikin Zukifli
- Department of Basic Medical Sciences, Kulliyyah of Pharmacy, Kuantan Campus, International Islamic University Malaysia, Bandar Indera Mahkota, Kuantan, Malaysia
| | - Zalikha Ibrahim
- Department of Pharmaceutical Chemistry, Kulliyyah of Pharmacy, Kuantan Campus, International Islamic University Malaysia, Bandar Indera Mahkota, Kuantan, Malaysia
| | - Iekhsan Othman
- Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Subang Jaya, Malaysia
| | - Ahmad Khaldun Ismail
- Department of Emergency Medicine, Universiti Kebangsaan Malaysia Medical Centre, Universiti Kebangsaan Malaysia, Cheras, Malaysia
| | - Janeyuth Chaisakul
- Department of Pharmacology, Phramongkutklao College of Medicine, Bangkok, Thailand
| | - Wayne C. Hodgson
- Monash Venom Group, Department of Pharmacology, Biomedical Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Muhamad Rusdi Ahmad Rusmili
- Department of Basic Medical Sciences, Kulliyyah of Pharmacy, Kuantan Campus, International Islamic University Malaysia, Bandar Indera Mahkota, Kuantan, Malaysia
- * E-mail:
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Ahmed SA, Abd El Reheem MH, Elbahy DA. l-Carnitine ameliorates the osteoporotic changes and protects against simvastatin induced myotoxicity and hepatotoxicity in glucocorticoid-induced osteoporosis in rats. Biomed Pharmacother 2022; 152:113221. [PMID: 35671582 DOI: 10.1016/j.biopha.2022.113221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Revised: 05/25/2022] [Accepted: 05/30/2022] [Indexed: 11/19/2022] Open
Abstract
The current study aimed to discover more effective drugs to treat osteoporosis (OP) with fewer side effects. OP was induced in 24 rats using dexamethasone (DEX) 7 mg/kg intramuscular once weekly for four weeks, with six rats as a negative control. The osteoporotic rats were divided into one untreated group (positive control) and three treated groups (n = 6) that received L-carnitine (L-Car) (100 mg/kg/d), simvastatin (SIMV) (10 mg/kg/d), and L-Car + SIMV in the same previous doses, all treatments were orally for four weeks. At the end of the experiment, serum calcium (Ca), phosphorous (P), alkaline phosphatase (ALP), osteoprotegerin (OPG), total antioxidant (TAO), creatine kinase (CK), alanine aminotransferase (ALT), and aspartate aminotransferase (AST) levels were measured. The femur was histopathologically examined. Serum Ca, OPG, and TAO levels increased significantly, while P and ALP levels decreased in the L-Car and SIMV treated groups compared to the DEX-treated group. Moreover, there was a significant decrease in CK, ALT, and AST levels in the L-Car and L-Car + SIMV treated groups compared to the DEX treated group. CONCLUSIONS: L-Car and SIMV have antiosteoporotic effects, as well as a synergistic effect. Moreover, L-Car ameliorates SIMV-induced myotoxicity and hepatoxicity.
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Affiliation(s)
- Sanaa A Ahmed
- Department of Pharmacology, Faculty of Medicine, Sohag University, 82524, Egypt.
| | | | - Dalia A Elbahy
- Department of Pharmacology, Faculty of Medicine, Sohag University, 82524, Egypt
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Thakshila P, Hodgson WC, Isbister GK, Silva A. In Vitro Neutralization of the Myotoxicity of Australian Mulga Snake ( Pseudechis australis) and Sri Lankan Russell's Viper ( Daboia russelii) Venoms by Australian and Indian Polyvalent Antivenoms. Toxins (Basel) 2022; 14:302. [PMID: 35622549 PMCID: PMC9144940 DOI: 10.3390/toxins14050302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 04/20/2022] [Accepted: 04/23/2022] [Indexed: 11/16/2022] Open
Abstract
We studied the neutralisation of Sri Lankan Russell's viper (Daboia russelii) and Australian mulga snake (Pseudechis australis) venom-induced myotoxicity by Indian (Vins and Bharat) and Australian (Seqirus) polyvalent antivenoms, using the in vitro chick biventer skeletal muscle preparation. Prior addition of Bharat or Vins antivenoms abolished D. russelii venom (30 µg/mL)-mediated inhibition of direct twitches, while Australian polyvalent antivenom was not protective. Bharat antivenom prevented, while Vins and Australian polyvalent antivenoms partially prevented, the inhibition of responses to exogenous KCl. Myotoxicity of Mulga venom (10 µg/mL) was fully neutralised by the prior addition of Australian polyvalent antivenom, partially neutralised by Vins antivenom but not by Bharat antivenom. Although the myotoxicity of both venoms was partially prevented by homologous antivenoms when added 5 min after the venom, with an increasing time delay between venom and antivenom, the reversal of myotoxicity gradually decreased. However, antivenoms partially prevented myotoxicity even 60 min after venom. The effect of antivenoms on already initiated myotoxicity was comparable to physical removal of the toxins by washing the bath at similar time points, indicating that the action of the antivenoms on myotoxicity is likely to be due to trapping the toxins or steric hindrance within the circulation, not allowing the toxins to reach target sites in muscles.
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Affiliation(s)
- Prabhani Thakshila
- Department of Parasitology, Faculty of Medicine and Allied Sciences, Rajarata University of Sri Lanka, Anuradhapura 50008, Sri Lanka;
- South Asian Clinical Toxicology Research Collaboration (SACTRC), Faculty of Medicine, University of Peradeniya, Peradeniya 20400, Sri Lanka;
| | - Wayne C. Hodgson
- Monash Venom Group, Department of Pharmacology, Biomedical Discovery Institute, Monash University, Clayton, VIC 3800, Australia;
| | - Geoffrey K. Isbister
- South Asian Clinical Toxicology Research Collaboration (SACTRC), Faculty of Medicine, University of Peradeniya, Peradeniya 20400, Sri Lanka;
- Clinical Toxicology Research Group, University of Newcastle, Newcastle, NSW 2298, Australia
| | - Anjana Silva
- Department of Parasitology, Faculty of Medicine and Allied Sciences, Rajarata University of Sri Lanka, Anuradhapura 50008, Sri Lanka;
- South Asian Clinical Toxicology Research Collaboration (SACTRC), Faculty of Medicine, University of Peradeniya, Peradeniya 20400, Sri Lanka;
- Monash Venom Group, Department of Pharmacology, Biomedical Discovery Institute, Monash University, Clayton, VIC 3800, Australia;
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Tsubaki M, Takeda T, Mastuda T, Kimura A, Yanae M, Maeda A, Hoshida T, Tanabe K, Nishida S. Combination treatment with statins and bezafibrate induces myotoxicity via inhibition of geranylgeranyl pyrophosphate biosynthesis and Rho activation in L6 myoblasts and myotube cells. J Physiol Pharmacol 2022; 73. [PMID: 35793766 DOI: 10.26402/jpp.2022.1.14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 02/28/2022] [Indexed: 06/15/2023]
Abstract
Statins and fibrates are frequently used to treat hyperlipidemia; however, these drugs may have adverse effects such as rhabdomyolysis. The incidence of rhabdomyolysis due to fibrates and statins is low (0.0028-0.0096%) when administered as monotherapy, however it increases to 0.015-0.021% when the drugs are used in combination. The mechanism underlying myotoxicity induced by the combination of statins and fibrates is yet unclear. Here, we investigated the mechanisms underlying induced myotoxicity in rat myoblasts L6 and differentiated L6 cells (myotubes) using a combination of statins and fibrates. We found that cell death induced by a combination of fluvastatin or simvastatin with bezafibrate or fenofibrate in L6 myoblasts and myotubes was mediated by inhibition of geranylgeranyl pyrophosphate (GGPP) production. Additionally, the drug combination inhibited Rho activation in L6 myoblasts and myotube cells. In L6 myoblasts, the combination of statins and bezafibrate enhanced p27 expression and induced G1 arrest and apoptosis. Furthermore, combined treatment suppressed Akt activation and enhanced Bim expression in L6 myotubes but did not affect extracellular regulated protein kinase 1/2 activation. These results suggested that combined administration of statins and fibrates induced death of L6 myoblasts and myotube cells by inhibiting GGPP biosynthesis and Rho pathway activation. Supplementation with GGPP may be therapeutically beneficial for preventing myotoxicity associated with combined statin and fibrates treatment.
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Affiliation(s)
- M Tsubaki
- Division of Pharmacotherapy, Kindai University School of Pharmacy, Kowakae, Higashi-Osaka, Japan
| | - T Takeda
- Division of Pharmacotherapy, Kindai University School of Pharmacy, Kowakae, Higashi-Osaka, Japan
| | - T Mastuda
- Division of Pharmacotherapy, Kindai University School of Pharmacy, Kowakae, Higashi-Osaka, Japan
| | - A Kimura
- Division of Pharmacotherapy, Kindai University School of Pharmacy, Kowakae, Higashi-Osaka, Japan
| | - M Yanae
- Division of Pharmacotherapy, Kindai University School of Pharmacy, Kowakae, Higashi-Osaka, Japan
- Department of Pharmacy, Kindai University Hospital, Ohno-higashi, Osaka-Sayama, Osaka, Japan
| | - A Maeda
- Division of Pharmacotherapy, Kindai University School of Pharmacy, Kowakae, Higashi-Osaka, Japan
| | - T Hoshida
- Division of Pharmacotherapy, Kindai University School of Pharmacy, Kowakae, Higashi-Osaka, Japan
- Department of Pharmacy, Japanese Red Cross Society Wakayama Medical Center, Wakayama, Japan
| | - K Tanabe
- Department of Pharmacy, Japanese Red Cross Society Wakayama Medical Center, Wakayama, Japan
| | - S Nishida
- Division of Pharmacotherapy, Kindai University School of Pharmacy, Kowakae, Higashi-Osaka, Japan.
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Siniscalchi A, Mintzer S, De Sarro G, Gallelli L. Myotoxicity Induced by Antiepileptic Drugs: Could be a Rare but Serious Adverse Event? Psychopharmacol Bull 2021; 51:105-116. [PMID: 34887602 PMCID: PMC8601760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Antiepileptic drugs (AEDs) are used in various pathologies such as including epilepsy, migraine, neuropathic pain, etc. They can improve symptoms but cause adverse events (ADRs). Case reports have reported that one rare but serious AED-induced adverse reaction that has appeared in case reports is myotoxicity from rhabdomyolysis. Rhabdomyolysis can be induced by a therapeutically dosed occur with therapeutic doses of antiepileptic drugs and is in most cases reversible, although rarely it can cause serious complications. Clinical manifestations of rhabdomyolysis range from a single isolated asymptomatic rise in serum CK levels to severe electrolyte imbalances, cardiac arrhythmia, acute and disseminated renal failure, intravascular coagulation, and other symptoms. Many clinical cases reported that both conventional older and newer AEDs, as well as propofol, can cause rhabdomyolysis, even if there are no conclusive data. It has recently been shown that genetic factors certainly contribute to adverse reactions of antiepileptic drugs. A study of genetic polymorphism in patients with AED-induced rhabdomyolysis may be useful to explain the rarity of this adverse event and to improve the treatment of these AED patients, in terms of AED type and dose adjustment.
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Affiliation(s)
- Antonio Siniscalchi
- Siniscalchi, Department of Neurology and Stroke Unit, Annunziata Hospital of Cosenza, Cosenza, Italy. Mintzer, Jefferson Comprehensive Epilepsy Center, Thomas Jefferson University, Philadelphia, PA. De Sarro, University of Catanzaro, Clinical Pharmacology Unit, Mater Domini University Hospital - Chair of Pharmacology, Department of Health Science, School of Medicine, Catanzaro, Italy; FAS@umg Research Center, University of Catanzaro, Catanzaro, Italy. Gallelli, University of Catanzaro, Clinical Pharmacology Unit, Mater Domini University Hospital - Chair of Pharmacology, Department of Health Science, School of Medicine, Catanzaro, Italy; FAS@umg Research Center, University of Catanzaro, Catanzaro, Italy
| | - Scott Mintzer
- Siniscalchi, Department of Neurology and Stroke Unit, Annunziata Hospital of Cosenza, Cosenza, Italy. Mintzer, Jefferson Comprehensive Epilepsy Center, Thomas Jefferson University, Philadelphia, PA. De Sarro, University of Catanzaro, Clinical Pharmacology Unit, Mater Domini University Hospital - Chair of Pharmacology, Department of Health Science, School of Medicine, Catanzaro, Italy; FAS@umg Research Center, University of Catanzaro, Catanzaro, Italy. Gallelli, University of Catanzaro, Clinical Pharmacology Unit, Mater Domini University Hospital - Chair of Pharmacology, Department of Health Science, School of Medicine, Catanzaro, Italy; FAS@umg Research Center, University of Catanzaro, Catanzaro, Italy
| | - Giovambattista De Sarro
- Siniscalchi, Department of Neurology and Stroke Unit, Annunziata Hospital of Cosenza, Cosenza, Italy. Mintzer, Jefferson Comprehensive Epilepsy Center, Thomas Jefferson University, Philadelphia, PA. De Sarro, University of Catanzaro, Clinical Pharmacology Unit, Mater Domini University Hospital - Chair of Pharmacology, Department of Health Science, School of Medicine, Catanzaro, Italy; FAS@umg Research Center, University of Catanzaro, Catanzaro, Italy. Gallelli, University of Catanzaro, Clinical Pharmacology Unit, Mater Domini University Hospital - Chair of Pharmacology, Department of Health Science, School of Medicine, Catanzaro, Italy; FAS@umg Research Center, University of Catanzaro, Catanzaro, Italy
| | - Luca Gallelli
- Siniscalchi, Department of Neurology and Stroke Unit, Annunziata Hospital of Cosenza, Cosenza, Italy. Mintzer, Jefferson Comprehensive Epilepsy Center, Thomas Jefferson University, Philadelphia, PA. De Sarro, University of Catanzaro, Clinical Pharmacology Unit, Mater Domini University Hospital - Chair of Pharmacology, Department of Health Science, School of Medicine, Catanzaro, Italy; FAS@umg Research Center, University of Catanzaro, Catanzaro, Italy. Gallelli, University of Catanzaro, Clinical Pharmacology Unit, Mater Domini University Hospital - Chair of Pharmacology, Department of Health Science, School of Medicine, Catanzaro, Italy; FAS@umg Research Center, University of Catanzaro, Catanzaro, Italy
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Peppriell AE, Gunderson JT, Vorojeikina D, Rand MD. Methylmercury myotoxicity targets formation of the myotendinous junction. Toxicology 2020; 443:152561. [PMID: 32800841 PMCID: PMC7530093 DOI: 10.1016/j.tox.2020.152561] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 07/24/2020] [Accepted: 08/09/2020] [Indexed: 12/12/2022]
Abstract
Methylmercury (MeHg) is a ubiquitous environmental contaminant and developmental toxicant known to cause a variety of persistent motor and cognitive deficits. While previous research has focused predominantly on neurotoxic MeHg effects, emerging evidence points to a myotoxic role whereby MeHg induces defects in muscle development and maintenance. A genome wide association study for developmental sensitivity to MeHg in Drosophila has revealed several conserved muscle morphogenesis candidate genes that function in an array of processes from myoblast migration and fusion to myotendinous junction (MTJ) formation and myofibrillogenesis. Here, we investigated candidates for a role in mediating MeHg disruption of muscle development by evaluating morphological and functional phenotypes of the indirect flight muscles (IFMs) in pupal and adult flies following 0, 5, 10, and 15 μM MeHg exposure via feeding at the larval stage. Developmental MeHg exposure induced a dose-dependent increase in muscle detachments (myospheres) within dorsal bundles of the IFMs, which paralleled reductions eclosion and adult flight behaviors. These effects were selectively phenocopied by altered expression of kon-tiki (kon), a chondroitin sulfate proteoglycan 4/NG2 homologue and a central component of MTJ formation. MeHg elevated kon transcript expression at a crucial window of IFM development and transgene overexpression of kon could also phenocopy myosphere phenotypes and eclosion and flight deficits. Finally, the myosphere phenotype resulting from 10 μM MeHg was partially rescued in a background of reduced kon expression using a targeted RNAi approach. Our findings implicate a component of the MTJ as a MeHg toxicity target which broaden the understanding of how motor deficits can emerge from early life MeHg exposure.
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Affiliation(s)
- Ashley E Peppriell
- Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, United States
| | - Jakob T Gunderson
- Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, United States
| | - Daria Vorojeikina
- Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, United States
| | - Matthew D Rand
- Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, United States.
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