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Menikdiwela KR, Ramalingam L, Rasha F, Wang S, Dufour JM, Kalupahana NS, Sunahara KKS, Martins JO, Moustaid-Moussa N. Autophagy in metabolic syndrome: breaking the wheel by targeting the renin-angiotensin system. Cell Death Dis 2020; 11:87. [PMID: 32015340 PMCID: PMC6997396 DOI: 10.1038/s41419-020-2275-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 01/08/2020] [Accepted: 01/09/2020] [Indexed: 12/12/2022]
Abstract
Metabolic syndrome (MetS) is a complex, emerging epidemic which disrupts the metabolic homeostasis of several organs, including liver, heart, pancreas, and adipose tissue. While studies have been conducted in these research areas, the pathogenesis and mechanisms of MetS remain debatable. Lines of evidence show that physiological systems, such as the renin-angiotensin system (RAS) and autophagy play vital regulatory roles in MetS. RAS is a pivotal system known for controlling blood pressure and fluid balance, whereas autophagy is involved in the degradation and recycling of cellular components, including proteins. Although RAS is activated in MetS, the interrelationship between RAS and autophagy varies in glucose homeostatic organs and their cross talk is poorly understood. Interestingly, autophagy is attenuated in the liver during MetS, whereas autophagic activity is induced in adipose tissue during MetS, indicating tissue-specific discordant roles. We discuss in vivo and in vitro studies conducted in metabolic tissues and dissect their tissue-specific effects. Moreover, our review will focus on the molecular mechanisms by which autophagy orchestrates MetS and the ways future treatments could target RAS in order to achieve metabolic homeostasis.
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Affiliation(s)
- Kalhara R Menikdiwela
- Department of Nutritional Sciences, Texas Tech University, Lubbock, TX, USA
- Obesity Research Institute, Texas Tech University, Lubbock, TX, USA
| | - Latha Ramalingam
- Department of Nutritional Sciences, Texas Tech University, Lubbock, TX, USA
- Obesity Research Institute, Texas Tech University, Lubbock, TX, USA
| | - Fahmida Rasha
- Department of Nutritional Sciences, Texas Tech University, Lubbock, TX, USA
- Obesity Research Institute, Texas Tech University, Lubbock, TX, USA
| | - Shu Wang
- Department of Nutritional Sciences, Texas Tech University, Lubbock, TX, USA
- Obesity Research Institute, Texas Tech University, Lubbock, TX, USA
| | - Jannette M Dufour
- Obesity Research Institute, Texas Tech University, Lubbock, TX, USA
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX, USA
| | - Nishan S Kalupahana
- Department of Nutritional Sciences, Texas Tech University, Lubbock, TX, USA
- Obesity Research Institute, Texas Tech University, Lubbock, TX, USA
- Department of Physiology, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka
| | - Karen K S Sunahara
- Department of Experimental Physiopatholgy, Medical School University of São Paulo, São Paulo, Brazil
| | - Joilson O Martins
- Laboratory of Immunoendocrinology, Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences of University Sao Paulo (FCF/USP), São Paulo, Brazil
| | - Naima Moustaid-Moussa
- Department of Nutritional Sciences, Texas Tech University, Lubbock, TX, USA.
- Obesity Research Institute, Texas Tech University, Lubbock, TX, USA.
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Harrington MG, Fonteh AN, Arakaki X, Cowan RP, Ecke LE, Foster H, Hühmer AF, Biringer RG. Capillary endothelial Na(+), K(+), ATPase transporter homeostasis and a new theory for migraine pathophysiology. Headache 2010; 50:459-78. [PMID: 19845787 PMCID: PMC8020446 DOI: 10.1111/j.1526-4610.2009.01551.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
BACKGROUND Cerebrospinal fluid sodium concentration ([Na(+)](csf)) increases during migraine, but the cause of the increase is not known. OBJECTIVE Analyze biochemical pathways that influence [Na(+)](csf) to identify mechanisms that are consistent with migraine. METHOD We reviewed sodium physiology and biochemistry publications for links to migraine and pain. RESULTS Increased capillary endothelial cell (CEC) Na(+), K(+), -ATPase transporter (NKAT) activity is probably the primary cause of increased [Na(+)](csf). Physiological fluctuations of all NKAT regulators in blood, many known to be involved in migraine, are monitored by receptors on the luminal wall of brain CECs; signals are then transduced to their abluminal NKATs that alter brain extracellular sodium ([Na(+)](e)) and potassium ([K(+)](e)). CONCLUSIONS We propose a theoretical mechanism for aura and migraine when NKAT activity shifts outside normal limits: (1) CEC NKAT activity below a lower limit increases [K(+)](e), facilitates cortical spreading depression, and causes aura; (2) CEC NKAT activity above an upper limit elevates [Na(+)](e), increases neuronal excitability, and causes migraine; (3) migraine-without-aura may arise from CEC NKAT over-activity without requiring a prior decrease in activity and its consequent spreading depression; (4) migraine triggers disturb, and treatments improve, CEC NKAT homeostasis; (5) CEC NKAT-induced regulation of neural and vasomotor excitability coordinates vascular and neuronal activities, and includes occasional pathology from CEC NKAT-induced apoptosis or cerebral infarction.
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Affiliation(s)
- Michael G Harrington
- Huntington Medical Research Institutes - Molecular Neurology, Pasadena, CA 91101, USA
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Strugala GJ, Elsenhans B, Forth W. Active transport inhibition in rat small intestine by amphiphilic amines: an in vitro study with various local anaesthetics. Biochem Pharmacol 2000; 59:907-13. [PMID: 10692555 DOI: 10.1016/s0006-2952(99)00394-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In the present investigation with rings of everted rat small intestine, amphiphilic amines such as local anaesthetics (e.g. lidocaine, procaine, tolycaine) were employed to study their effects on intestinal absorption of methyl alpha-D-glucoside, L-leucine, D-fructose, and 2-deoxy-D-glucose. All the amphiphilic amines tested, except for benzocaine, significantly inhibited Na(+)-dependent active uptake of methyl alpha-D-glucoside and L-leucine while leaving uptake of D-fructose (facilitated diffusion) and 2-deoxy-D-glucose (passive diffusion) unaffected. Increasing concentrations of lidocaine in the incubation medium inhibited the uptake of methyl alpha-D-glucoside (IC(50) approximately 3.5 mmol/L) and L-leucine (IC(50) approximately 6 mmol/L) in a dose-dependent manner. Complete reversibility of the inhibitory effect could only be achieved at short-term incubations (</=2 min) and low lidocaine concentrations (</=3 mmol/L), otherwise inhibition became partially irreversible. Uptake kinetics of methyl alpha-D-glucoside and L-leucine in the presence of lidocaine revealed a significant increase in the apparent Michaelis constant, leaving the maximal transport capacity essentially unaltered. Reducing the Na(+) concentration in the incubation medium aggravated inhibition by lidocaine of the uptake of methyl alpha-D-glucoside. Analysis of the inhibition kinetics by Dixon plots revealed a competitive interaction between Na(+) and the amphiphiles. However, phlorizin binding was not affected by lidocaine. Changing the pH of the incubation medium from 5.6 to 8.0 increased the inhibitory effect of the amphiphiles, which indicated that the non-ionised and, thus, more lipophilic form participates in the mechanism of inhibition. However, benzocaine, a rather lipophilic local anaesthetic with no aliphatic amino group, did not impair active uptake of methyl alpha-D-glucoside. Whether the amphiphilic amines act by their partition into the membrane matrix or directly interact with sodium binding sites remains to be elucidated, however.
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Affiliation(s)
- G J Strugala
- Walther Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität München, D-80336, München, Germany.
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Masturzo P, Salmona M, Nordstrom O, Consolo S, Ladinsky H. Intact human lymphocyte membranes respond to muscarinic receptor stimulation by oxotremorine with marked changes in microviscosity and an increase in cyclic GMP. FEBS Lett 1985; 192:194-8. [PMID: 2998866 DOI: 10.1016/0014-5793(85)80106-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The muscarinic agonist oxotremorine produced a linear dose-dependent increase in membrane fluidity of intact and viable human lymphocytes in vitro. This effect proved to be receptor-mediated because preincubation with 10(-5)M atropine shifted the dose-response curve one order of magnitude rightward. Pirenzepine preincubation did not affect membrane fluidity variation. A cGMP increase was also found after oxotremorine treatment. The results are discussed in terms of possible modulation of guanyl cyclase and adenyl cyclase through membrane fluidity variations.
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Godin DV, Gray GR, Frohlich J. Study of erythrocytes in a hereditary hemolytic syndrome (HHS): comparison with erythrocytes in lecithin:cholesterol acyltransferase (LCAT) deficiency. SCANDINAVIAN JOURNAL OF HAEMATOLOGY 1980; 24:122-30. [PMID: 6246569 DOI: 10.1111/j.1600-0609.1980.tb02355.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Erythrocyte membrane abnormalities in 3 members of a family with a hereditary haemolytic syndrome (HHS) were compared to those previously described in a family with lecithin:cholesterol acyltransferase (LCAT) deficiency. Despite similarities including an increase in membrane phosphatidylcholine, a decrease in phosphatidylethanolamine, stomatocytosis, and a marked decrease in erythrocyte osmotic fragility a number of differences were observed. These included membrane cholesterol content (increased in homozygotes with LCAT deficiency), changes in sodium and potassium content and Na+,k+-ATPase activity (the latter being increased in HHS), changes in acetylcholinesterase and sulfhydryl group latency (present in LCAT deficiency, but not in HHS) and 2,3 DPG content (decreased in HHS, normal in LCAT deficiency. Full compensation of the erythrocyte defect occurred in HHS but the homozygotes for LCAT deficiency were slightly anaemic. It is concluded that, although similar abnormalities in phospholipid composition, osmotic fragility, and erythrocyte morphology exist in these two disorders, the molecular nature of the erythrocyte membrane structural and functional changes in HHS and LCAT deficiency is clearly different.
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