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Gottschalk G, Peterson D, Knox K, Maynard M, Whelan RJ, Roy A. Elevated ATG13 in serum of patients with ME/CFS stimulates oxidative stress response in microglial cells via activation of receptor for advanced glycation end products (RAGE). Mol Cell Neurosci 2022; 120:103731. [PMID: 35487443 DOI: 10.1016/j.mcn.2022.103731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 04/13/2022] [Accepted: 04/17/2022] [Indexed: 10/18/2022] Open
Abstract
Myalgic Encephalomyelitis, also known as Chronic Fatigue Syndrome (ME/CFS), is a multisystem illness characterized by extreme muscle fatigue associated with pain, neurocognitive impairment, and chronic inflammation. Despite intense investigation, the molecular mechanism of this disease is still unknown. Here we demonstrate that autophagy-related protein ATG13 is strongly upregulated in the serum of ME/CFS patients, indicative of impairment in the metabolic events of autophagy. A Thioflavin T-based protein aggregation assay, array screening for autophagy-related factors, densitometric analyses, and confirmation with ELISA revealed that the level of ATG13 was strongly elevated in serum samples of ME/CFS patients compared to age-matched controls. Moreover, our microglia-based oxidative stress response experiments indicated that serum samples of ME/CFS patients evoke the production of reactive oxygen species (ROS) and nitric oxide in human HMC3 microglial cells, whereas neutralization of ATG13 strongly diminishes the production of ROS and NO, suggesting that ATG13 plays a role in the observed stress response in microglial cells. Finally, an in vitro ligand binding assay provided evidence that ATG13 employs the Receptor for Advanced Glycation End-products (RAGE) to stimulate ROS in microglial cells. Collectively, our results suggest that an impairment of autophagy following the release of ATG13 into serum could be a pathological signal in ME/CFS.
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Affiliation(s)
- Gunnar Gottschalk
- Simmaron Research Institute, 948 Incline Way, Incline Village, NV 89451, United States of America; Simmaron R&D lab, Technology Innovation Center, 10437 W Innovation Drive, Wauwatosa, WI 53226, United States of America
| | - Daniel Peterson
- Simmaron Research Institute, 948 Incline Way, Incline Village, NV 89451, United States of America
| | - Konstance Knox
- Coppe Laboratories, W229N1870 Westwood Dr, Waukesha, WI 53186., United States of America
| | - Marco Maynard
- Simmaron R&D lab, Technology Innovation Center, 10437 W Innovation Drive, Wauwatosa, WI 53226, United States of America
| | - Ryan J Whelan
- Simmaron R&D lab, Technology Innovation Center, 10437 W Innovation Drive, Wauwatosa, WI 53226, United States of America
| | - Avik Roy
- Simmaron Research Institute, 948 Incline Way, Incline Village, NV 89451, United States of America; Simmaron R&D lab, Technology Innovation Center, 10437 W Innovation Drive, Wauwatosa, WI 53226, United States of America.
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Novel Heme Oxygenase-1 (HO-1) Inducers Based on Dimethyl Fumarate Structure. Int J Mol Sci 2020; 21:ijms21249541. [PMID: 33333908 PMCID: PMC7765375 DOI: 10.3390/ijms21249541] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 12/10/2020] [Accepted: 12/12/2020] [Indexed: 12/31/2022] Open
Abstract
Novel heme oxygenase-1 (HO-1) inducers based on dimethyl fumarate (DMF) structure are reported in this paper. These compounds are obtained by modification of the DMF backbone. Particularly, maintaining the α, β-unsaturated dicarbonyl function as the central chain crucial for HO-1 induction, different substituted or unsubstituted phenyl rings are introduced by means of an ester or amide linkage. Symmetric and asymmetric derivatives are synthesized. All compounds are tested on a human hepatic stellate cell line LX-2 to assay their capacity for modifying HO-1 expression. Compounds 1b, 1l and 1m stand out for their potency as HO-1 inducers, being 2–3 fold more active than DMF, and for their ability to reverse reactive oxygen species (ROS) production mediated using palmitic acid (PA). These properties, coupled with a low toxicity toward LX-2 cell lines, make these compounds potentially useful for treatment of diseases in which HO-1 overexpression may counteract inflammation, such as hepatic fibrosis. Docking studies show a correlation between predicted binding free energy and experimental HO-1 expression data. These preliminary results may support the development of new approaches in the management of liver fibrosis.
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Boteva E, Mironova R. Maillard reaction and aging: can bacteria shed light on the link? BIOTECHNOL BIOTEC EQ 2019. [DOI: 10.1080/13102818.2019.1590160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Affiliation(s)
- Elitsa Boteva
- Department of Gene Regulation, Institute of Molecular Biology ‘Roumen Tsanev’, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Roumyana Mironova
- Department of Gene Regulation, Institute of Molecular Biology ‘Roumen Tsanev’, Bulgarian Academy of Sciences, Sofia, Bulgaria
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