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Vágási CI, Vincze O, Adámková M, Kauzálová T, Lendvai ÁZ, Pătraş LI, Pénzes J, Pap PL, Albrecht T, Tomášek O. Songbirds avoid the oxidative stress costs of high blood glucose levels: a comparative study. J Exp Biol 2024; 227:jeb246848. [PMID: 38054362 DOI: 10.1242/jeb.246848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 11/29/2023] [Indexed: 12/07/2023]
Abstract
Chronically high blood glucose levels (hyperglycaemia) can compromise healthy ageing and lifespan at the individual level. Elevated oxidative stress can play a central role in hyperglycaemia-induced pathologies. Nevertheless, the lifespan of birds shows no species-level association with blood glucose. This suggests that the potential pathologies of high blood glucose levels can be avoided by adaptations in oxidative physiology at the macroevolutionary scale. However, this hypothesis remains unexplored. Here, we examined this hypothesis using comparative analyses controlled for phylogeny, allometry and fecundity based on data from 51 songbird species (681 individuals with blood glucose data and 1021 individuals with oxidative state data). We measured blood glucose at baseline and after stress stimulus and computed glucose stress reactivity as the magnitude of change between the two time points. We also measured three parameters of non-enzymatic antioxidants (uric acid, total antioxidants and glutathione) and a marker of oxidative lipid damage (malondialdehyde). We found no clear evidence for blood glucose concentration being correlated with either antioxidant or lipid damage levels at the macroevolutionary scale, as opposed to the hypothesis postulating that high blood glucose levels entail oxidative costs. The only exception was the moderate evidence for species with a stronger stress-induced increase in blood glucose concentration evolving moderately lower investment into antioxidant defence (uric acid and glutathione). Neither baseline nor stress-induced glucose levels were associated with oxidative physiology. Our findings support the hypothesis that birds evolved adaptations preventing the (glyc)oxidative costs of high blood glucose observed at the within-species level. Such adaptations may explain the decoupled evolution of glycaemia and lifespan in birds and possibly the paradoxical combination of long lifespan and high blood glucose levels relative to mammals.
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Affiliation(s)
- Csongor I Vágási
- Evolutionary Ecology Group, Centre for Systems Biology, Biodiversity and Bioresources, Hungarian Department of Biology and Ecology, Babeş-Bolyai University, 400006 Cluj-Napoca, Romania
| | - Orsolya Vincze
- Evolutionary Ecology Group, Centre for Systems Biology, Biodiversity and Bioresources, Hungarian Department of Biology and Ecology, Babeş-Bolyai University, 400006 Cluj-Napoca, Romania
- Wetland Ecology Research Group, HUN-REN Centre for Ecological Research, Institute of Aquatic Ecology, 4026 Debrecen, Hungary
| | - Marie Adámková
- Institute of Vertebrate Biology of the Czech Academy of Sciences, 60300 Brno, Czech Republic
- Department of Botany and Zoology, Faculty of Science, Masaryk University, 61137 Brno, Czech Republic
| | - Tereza Kauzálová
- Institute of Vertebrate Biology of the Czech Academy of Sciences, 60300 Brno, Czech Republic
| | - Ádám Z Lendvai
- Department of Evolutionary Zoology, University of Debrecen, 4032 Debrecen, Hungary
| | - Laura I Pătraş
- Department of Molecular Biology and Biotechnology, Centre of Systems Biology, Biodiversity and Bioresources, Babeş-Bolyai University, 400006 Cluj-Napoca, Romania
| | - Janka Pénzes
- Evolutionary Ecology Group, Centre for Systems Biology, Biodiversity and Bioresources, Hungarian Department of Biology and Ecology, Babeş-Bolyai University, 400006 Cluj-Napoca, Romania
| | - Péter L Pap
- Evolutionary Ecology Group, Centre for Systems Biology, Biodiversity and Bioresources, Hungarian Department of Biology and Ecology, Babeş-Bolyai University, 400006 Cluj-Napoca, Romania
| | - Tomáš Albrecht
- Institute of Vertebrate Biology of the Czech Academy of Sciences, 60300 Brno, Czech Republic
- Department of Zoology, Faculty of Science, Charles University, 12800 Prague 2, Czech Republic
| | - Oldřich Tomášek
- Institute of Vertebrate Biology of the Czech Academy of Sciences, 60300 Brno, Czech Republic
- Department of Botany and Zoology, Faculty of Science, Masaryk University, 61137 Brno, Czech Republic
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The conserved regulation of mitochondrial uncoupling proteins: From unicellular eukaryotes to mammals. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2016; 1858:21-33. [PMID: 27751905 DOI: 10.1016/j.bbabio.2016.10.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Revised: 09/29/2016] [Accepted: 10/13/2016] [Indexed: 12/19/2022]
Abstract
Uncoupling proteins (UCPs) belong to the mitochondrial anion carrier protein family and mediate regulated proton leak across the inner mitochondrial membrane. Free fatty acids, aldehydes such as hydroxynonenal, and retinoids activate UCPs. However, there are some controversies about the effective action of retinoids and aldehydes alone; thus, only free fatty acids are commonly accepted positive effectors of UCPs. Purine nucleotides such as GTP inhibit UCP-mediated mitochondrial proton leak. In turn, membranous coenzyme Q may play a role as a redox state-dependent metabolic sensor that modulates the complete activation/inhibition of UCPs. Such regulation has been observed for UCPs in microorganisms, plant and animal UCP1 homologues, and UCP1 in mammalian brown adipose tissue. The origin of UCPs is still under debate, but UCP homologues have been identified in all systematic groups of eukaryotes. Despite the differing levels of amino acid/DNA sequence similarities, functional studies in unicellular and multicellular organisms, from amoebae to mammals, suggest that the mechanistic regulation of UCP activity is evolutionarily well conserved. This review focuses on the regulatory feedback loops of UCPs involving free fatty acids, aldehydes, retinoids, purine nucleotides, and coenzyme Q (particularly its reduction level), which may derive from the early stages of evolution as UCP first emerged.
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Slocinska M, Lubawy J, Jarmuszkiewicz W, Rosinski G. Evidences for an ATP-sensitive potassium channel (KATP) in muscle and fat body mitochondria of insect. JOURNAL OF INSECT PHYSIOLOGY 2013; 59:1125-1132. [PMID: 23973818 DOI: 10.1016/j.jinsphys.2013.08.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 08/08/2013] [Accepted: 08/13/2013] [Indexed: 06/02/2023]
Abstract
In the present study, we describe the existence of mitochondrial ATP-dependent K(+) channel (mitoKATP) in two different insect tissues, fat body and muscle of cockroach Gromphadorhina coquereliana. We found that pharmacological substances known to modulate potassium channel activity influenced mitochondrial resting respiration. In isolated mitochondria oxygen consumption increased by about 13% in the presence of potassium channel openers (KCOs) such as diazoxide and pinacidil. The opening of mitoKATP was reversed by glibenclamide (potassium channel blocker) and 1 mM ATP. Immunological studies with antibodies raised against the Kir6.1 and SUR1 subunits of the mammalian ATP-sensitive potassium channel, indicated the existence of mitoKATP in insect mitochondria. MitoKATP activation by KCOs resulted in a decrease in superoxide anion production, suggesting that protection against mitochondrial oxidative stress may be a physiological role of mitochondrial ATP-sensitive potassium channel in insects.
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Affiliation(s)
- Malgorzata Slocinska
- Department of Animal Physiology and Development, Adam Mickiewicz University, Poznan, Poland.
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Functional characterization of an uncoupling protein in goldfish white skeletal muscle. J Bioenerg Biomembr 2013; 45:243-51. [DOI: 10.1007/s10863-013-9512-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Accepted: 04/05/2013] [Indexed: 11/27/2022]
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