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Wang J, Huffman D, Ajwad A, McLouth CJ, Bachstetter A, Kohler K, Murphy MP, O'Hara BF, Duncan MJ, Sunderam S. Thermoneutral Temperature Exposure Enhances Slow Wave Sleep with a Correlated Improvement in Amyloid Pathology in a Triple-Transgenic Mouse Model of Alzheimer's Disease. Sleep 2024:zsae078. [PMID: 38512801 DOI: 10.1093/sleep/zsae078] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Indexed: 03/23/2024] Open
Abstract
Accumulation of amyloid-β (Aβ) plays an important role in Alzheimer's disease (AD) pathology. There is growing evidence that disordered sleep may accelerate AD pathology by impeding the physiological clearance of Aβ from the brain that occurs in normal sleep. Therapeutic strategies for improving sleep quality may therefore help slow disease progression. It is well documented that the composition and dynamics of sleep are sensitive to ambient temperature. We therefore compared Aβ pathology and sleep metrics derived from polysomnography in 12-month-old female 3xTg-AD mice (n = 8) exposed to thermoneutral temperatures during the light period over four weeks to those of age- and sex-matched controls (n = 8) that remained at normal housing temperature (22⁰C) during the same period. The treated group experienced greater proportions of slow wave sleep (SWS)-i.e., epochs of elevated 0.5-2 Hz slow wave activity during non-rapid eye movement (NREM) sleep-compared to controls. Assays performed on mouse brain tissue harvested at the end of the experiment showed that exposure to thermoneutral temperatures significantly reduced levels of DEA-soluble (but not RIPA- or FA-soluble) Aβ40 and Aβ42 in the hippocampus, though not in the cortex. With both groups pooled together and without regard to treatment condition, NREM sleep continuity and any measure of SWS within NREM at the end of the treatment period were inversely correlated with DEA-soluble Aβ40 and Aβ42 levels, again in the hippocampus but not in the cortex. These findings suggest that experimental manipulation of SWS could offer useful clues into the mechanisms and treatment of AD.
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Affiliation(s)
- J Wang
- F. Joseph Halcomb III, MD, Department of Biomedical Engineering, University of Kentucky, Lexington, Kentucky, USA
| | - D Huffman
- F. Joseph Halcomb III, MD, Department of Biomedical Engineering, University of Kentucky, Lexington, Kentucky, USA
| | - A Ajwad
- F. Joseph Halcomb III, MD, Department of Biomedical Engineering, University of Kentucky, Lexington, Kentucky, USA
- University of Diyala College of Medicine, Diyala, Iraq
| | - C J McLouth
- Department of Biostatistics, University of Kentucky, Lexington, Kentucky, USA
| | - A Bachstetter
- Department of Neuroscience, University of Kentucky, Lexington, Kentucky, USA
| | - K Kohler
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky, USA
| | - M P Murphy
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky, USA
| | - B F O'Hara
- Department of Biology, University of Kentucky, Lexington, Kentucky, USA
| | - M J Duncan
- Department of Neuroscience, University of Kentucky, Lexington, Kentucky, USA
| | - S Sunderam
- F. Joseph Halcomb III, MD, Department of Biomedical Engineering, University of Kentucky, Lexington, Kentucky, USA
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James CM, Olejniczak SH, Repasky EA. How murine models of human disease and immunity are influenced by housing temperature and mild thermal stress. Temperature (Austin) 2022; 10:166-178. [PMID: 37332306 PMCID: PMC10274546 DOI: 10.1080/23328940.2022.2093561] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 06/16/2022] [Accepted: 06/17/2022] [Indexed: 10/17/2022] Open
Abstract
At the direction of The Guide and Use of Laboratory Animals, rodents in laboratory facilities are housed at ambient temperatures between 20°C and 26°C, which fall below their thermoneutral zone (TNZ). TNZ is identified as a range of ambient temperatures that allow an organism to regulate body temperature without employing additional thermoregulatory processes (e.g. metabolic heat production driven by norepinephrine), thus leading to mild, chronic cold stress. For mice, this chronic cold stress leads to increased serum levels of the catecholamine norepinephrine, which has direct effects on various immune cells and several aspects of immunity and inflammation. Here, we review several studies that have revealed that ambient temperature significantly impacts outcomes in various murine models of human diseases, particularly those in which the immune system plays a major role in its pathogenesis. The impact of ambient temperature on experimental outcomes raises questions regarding the clinical relevance of some murine models of human disease, since studies examining rodents housed within thermoneutral ambient temperatures revealed that rodent disease pathology more closely resembled that of humans. Unlike laboratory rodents, humans can modify their surroundings accordingly - by adjusting their clothing, the thermostat, or their physical activity - to live within the appropriate TNZ, offering a possible explanation for why many studies using murine models of human disease conducted at thermoneutrality better represent patient outcomes. Thus, it is strongly recommended that ambient housing temperature in such studies be consistently and accurately reported and recognized as an important experimental variable.
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Affiliation(s)
- Caitlin M. James
- Department of Immunology, Roswell Park Cancer Institute, Buffalo, NY, USA
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Sistilli G, Kalendova V, Cajka T, Irodenko I, Bardova K, Oseeva M, Zacek P, Kroupova P, Horakova O, Lackner K, Gastaldelli A, Kuda O, Kopecky J, Rossmeisl M. Krill Oil Supplementation Reduces Exacerbated Hepatic Steatosis Induced by Thermoneutral Housing in Mice with Diet-Induced Obesity. Nutrients 2021; 13:437. [PMID: 33572810 PMCID: PMC7912192 DOI: 10.3390/nu13020437] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 01/19/2021] [Accepted: 01/26/2021] [Indexed: 02/07/2023] Open
Abstract
Preclinical evidence suggests that n-3 fatty acids EPA and DHA (Omega-3) supplemented as phospholipids (PLs) may be more effective than triacylglycerols (TAGs) in reducing hepatic steatosis. To further test the ability of Omega-3 PLs to alleviate liver steatosis, we used a model of exacerbated non-alcoholic fatty liver disease based on high-fat feeding at thermoneutral temperature. Male C57BL/6N mice were fed for 24 weeks a lard-based diet given either alone (LHF) or supplemented with Omega-3 (30 mg/g diet) as PLs (krill oil; ω3PL) or TAGs (Epax 3000TG concentrate; ω3TG), which had a similar total content of EPA and DHA and their ratio. Substantial levels of TAG accumulation (~250 mg/g) but relatively low inflammation/fibrosis levels were achieved in the livers of control LHF mice. Liver steatosis was reduced by >40% in the ω3PL but not ω3TG group, and plasma ALT levels were markedly reduced (by 68%) in ω3PL mice as well. Krill oil administration also improved hepatic insulin sensitivity, and its effects were associated with high plasma adiponectin levels (150% of LHF mice) along with superior bioavailability of EPA, increased content of alkaloids stachydrine and trigonelline, suppression of lipogenic gene expression, and decreased diacylglycerol levels in the liver. This study reveals that in addition to Omega-3 PLs, other constituents of krill oil, such as alkaloids, may contribute to its strong antisteatotic effects in the liver.
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Affiliation(s)
- Gabriella Sistilli
- Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic; (G.S.); (V.K.); (T.C.); (I.I.); (K.B.); (M.O.); (P.K.); (O.H.); (O.K.); (J.K.)
- Department of Physiology, Faculty of Science, Charles University, Vinicna 7, 12844 Prague 2, Czech Republic
| | - Veronika Kalendova
- Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic; (G.S.); (V.K.); (T.C.); (I.I.); (K.B.); (M.O.); (P.K.); (O.H.); (O.K.); (J.K.)
- Department of Physiology, Faculty of Science, Charles University, Vinicna 7, 12844 Prague 2, Czech Republic
| | - Tomas Cajka
- Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic; (G.S.); (V.K.); (T.C.); (I.I.); (K.B.); (M.O.); (P.K.); (O.H.); (O.K.); (J.K.)
| | - Illaria Irodenko
- Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic; (G.S.); (V.K.); (T.C.); (I.I.); (K.B.); (M.O.); (P.K.); (O.H.); (O.K.); (J.K.)
- Department of Physiology, Faculty of Science, Charles University, Vinicna 7, 12844 Prague 2, Czech Republic
| | - Kristina Bardova
- Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic; (G.S.); (V.K.); (T.C.); (I.I.); (K.B.); (M.O.); (P.K.); (O.H.); (O.K.); (J.K.)
| | - Marina Oseeva
- Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic; (G.S.); (V.K.); (T.C.); (I.I.); (K.B.); (M.O.); (P.K.); (O.H.); (O.K.); (J.K.)
- Department of Physiology, Faculty of Science, Charles University, Vinicna 7, 12844 Prague 2, Czech Republic
| | - Petr Zacek
- Proteomics Core Facility, Faculty of Science, Charles University, Division BIOCEV, Prumyslova 595, 25250 Vestec, Czech Republic;
| | - Petra Kroupova
- Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic; (G.S.); (V.K.); (T.C.); (I.I.); (K.B.); (M.O.); (P.K.); (O.H.); (O.K.); (J.K.)
| | - Olga Horakova
- Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic; (G.S.); (V.K.); (T.C.); (I.I.); (K.B.); (M.O.); (P.K.); (O.H.); (O.K.); (J.K.)
| | - Karoline Lackner
- Institute of Pathology, Medical University of Graz, Neue Stiftingtalstraße 6, 8010 Graz, Austria;
| | - Amalia Gastaldelli
- Cardiometabolic Risk Unit, Institute of Clinical Physiology, National Research Council, Via Moruzzi 1, 56100 Pisa, Italy;
| | - Ondrej Kuda
- Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic; (G.S.); (V.K.); (T.C.); (I.I.); (K.B.); (M.O.); (P.K.); (O.H.); (O.K.); (J.K.)
| | - Jan Kopecky
- Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic; (G.S.); (V.K.); (T.C.); (I.I.); (K.B.); (M.O.); (P.K.); (O.H.); (O.K.); (J.K.)
| | - Martin Rossmeisl
- Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic; (G.S.); (V.K.); (T.C.); (I.I.); (K.B.); (M.O.); (P.K.); (O.H.); (O.K.); (J.K.)
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Liu Q, Zhou Z, Liu P, Zhang S. Comparative proteomic study of liver lipid droplets and mitochondria in mice housed at different temperatures. FEBS Lett 2019; 593:2118-2138. [PMID: 31234227 PMCID: PMC6771624 DOI: 10.1002/1873-3468.13509] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 06/11/2019] [Accepted: 06/14/2019] [Indexed: 01/18/2023]
Abstract
Laboratory mice are standardly housed at around 23 °C, setting them under chronic cold stress. Metabolic changes in the liver in mice housed at thermoneutral, standard and cold temperatures remain unknown. In the present study, we isolated lipid droplets and mitochondria from their livers in a comparative proteomic study aiming to investigate the changes. According to proteomic analysis, mitochondrial tricarboxylic acid cycle (TCA cycle) and retinol metabolism are enhanced, whereas oxidative phosphorylation is not affected obviously under cold conditions, suggesting that liver mitochondria may increase TCA cycle capacity in biosynthetic pathways, as well as retinol metabolism, to help the liver to adapt. Based on proteomic and immunoblotting results, perilipin 5 and major urinary proteins are increased significantly, whereas mitochondrial pyruvate carrier is decreased dramatically under cold conditions, indicating their involvement in liver adaptation.
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Affiliation(s)
- Qingfeng Liu
- School of Basic Medical Sciences, Southwest Medical University, Luzhou, China
| | - Ziyun Zhou
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Pingsheng Liu
- School of Basic Medical Sciences, Southwest Medical University, Luzhou, China.,National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Shuyan Zhang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
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