Iron elevation and adipose tissue remodeling in the epididymal depot of a mouse model of polygenic obesity

Iron dysregulation is a potential contributor to the pathology of obesity-related metabolic complications. KK/HIJ (KK) mice, a polygenic obese mouse model, have elevated serum iron levels. A subset of KK male mice display a bronzing of epididymal adipose tissue (eAT) associated with >100-fold (p0...

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Veröffentlicht in:PloS one 2017-06, Vol.12 (6), p.e0179889
Hauptverfasser: Ma, Xiaoya, Pham, Vinh T, Mori, Hiroyuki, MacDougald, Ormond A, Shah, Yatrik M, Bodary, Peter F
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Bodary, Peter F
description Iron dysregulation is a potential contributor to the pathology of obesity-related metabolic complications. KK/HIJ (KK) mice, a polygenic obese mouse model, have elevated serum iron levels. A subset of KK male mice display a bronzing of epididymal adipose tissue (eAT) associated with >100-fold (p0.05). The eAT histology revealed iron retention, macrophage clustering, tissue fibrosis, cell death as well as accumulation of HIF-2α in the high iron eAT. qPCR showed significantly decreased Lep (leptin) and AdipoQ (adiponectin), whereas Tnfα (tumor necrosis factor α), and Slc40a1 (ferroportin) were up-regulated in HI (p
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KK/HIJ (KK) mice, a polygenic obese mouse model, have elevated serum iron levels. A subset of KK male mice display a bronzing of epididymal adipose tissue (eAT) associated with &gt;100-fold (p&lt;0.001) higher iron concentration. To further phenotype and characterize the adipose tissue iron overload, 27 male KK mice were evaluated. 14 had bronzing eAT and 13 had normal appearing eAT. Fasting serum and tissues were collected for iron content, qPCR, histology and western blot. High iron levels were confirmed in bronzing eAT (High Iron group, HI) versus normal iron level (NI) in normal appearing eAT. Surprisingly, iron levels in subcutaneous and brown adipose depots were not different between the groups (p&gt;0.05). The eAT histology revealed iron retention, macrophage clustering, tissue fibrosis, cell death as well as accumulation of HIF-2α in the high iron eAT. qPCR showed significantly decreased Lep (leptin) and AdipoQ (adiponectin), whereas Tnfα (tumor necrosis factor α), and Slc40a1 (ferroportin) were up-regulated in HI (p&lt;0.05). Elevated HIF-2α, oxidative stress and local insulin signaling loss was also observed. Our data suggest that deposition of iron in adipose tissue is limited to the epididymal depot in male KK mice. A robust adipose tissue remodeling is concomitant with the high iron concentration, which causes local adipose tissue insulin resistance.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0179889</identifier><identifier>PMID: 28651003</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Adiponectin ; Adiponectin - genetics ; Adipose tissue ; Adipose Tissue - metabolism ; Adipose Tissue - pathology ; Adiposity ; Alpha iron ; Analysis ; Animals ; Biology and Life Sciences ; Blood Glucose - metabolism ; Body fat ; Cell death ; Clustering ; Complications ; Cytokines ; Deposition ; Diabetes ; Diet ; Disease Models, Animal ; Endocrinology ; Epididymis - metabolism ; Epididymis - pathology ; Fasting ; Females ; Fibrosis ; Gene expression ; Genotype &amp; phenotype ; Health aspects ; Histology ; Homeostasis ; Hypoxia ; Insulin ; Insulin Resistance ; Internal medicine ; Iron ; Iron - metabolism ; Iron content ; Iron Overload - genetics ; Iron Overload - metabolism ; Iron Overload - pathology ; Kinesiology ; Leptin ; Leptin - genetics ; Macrophages ; Male ; Males ; Medicine and Health Sciences ; Metabolism ; Mice ; Mice, Mutant Strains ; Nickel ; Nutrition research ; Obesity ; Obesity - genetics ; Obesity - metabolism ; Obesity - pathology ; Oxidative stress ; Pathology ; Physiology ; Remodeling ; Research and Analysis Methods ; Risk factors ; Rodents ; Stress concentration ; Studies ; Tissue Distribution ; Tissues ; Tumor necrosis factor ; Type 2 diabetes</subject><ispartof>PloS one, 2017-06, Vol.12 (6), p.e0179889</ispartof><rights>COPYRIGHT 2017 Public Library of Science</rights><rights>2017 Ma et al. 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KK/HIJ (KK) mice, a polygenic obese mouse model, have elevated serum iron levels. A subset of KK male mice display a bronzing of epididymal adipose tissue (eAT) associated with &gt;100-fold (p&lt;0.001) higher iron concentration. To further phenotype and characterize the adipose tissue iron overload, 27 male KK mice were evaluated. 14 had bronzing eAT and 13 had normal appearing eAT. Fasting serum and tissues were collected for iron content, qPCR, histology and western blot. High iron levels were confirmed in bronzing eAT (High Iron group, HI) versus normal iron level (NI) in normal appearing eAT. Surprisingly, iron levels in subcutaneous and brown adipose depots were not different between the groups (p&gt;0.05). The eAT histology revealed iron retention, macrophage clustering, tissue fibrosis, cell death as well as accumulation of HIF-2α in the high iron eAT. qPCR showed significantly decreased Lep (leptin) and AdipoQ (adiponectin), whereas Tnfα (tumor necrosis factor α), and Slc40a1 (ferroportin) were up-regulated in HI (p&lt;0.05). Elevated HIF-2α, oxidative stress and local insulin signaling loss was also observed. Our data suggest that deposition of iron in adipose tissue is limited to the epididymal depot in male KK mice. A robust adipose tissue remodeling is concomitant with the high iron concentration, which causes local adipose tissue insulin resistance.</description><subject>Adiponectin</subject><subject>Adiponectin - genetics</subject><subject>Adipose tissue</subject><subject>Adipose Tissue - metabolism</subject><subject>Adipose Tissue - pathology</subject><subject>Adiposity</subject><subject>Alpha iron</subject><subject>Analysis</subject><subject>Animals</subject><subject>Biology and Life Sciences</subject><subject>Blood Glucose - metabolism</subject><subject>Body fat</subject><subject>Cell death</subject><subject>Clustering</subject><subject>Complications</subject><subject>Cytokines</subject><subject>Deposition</subject><subject>Diabetes</subject><subject>Diet</subject><subject>Disease Models, Animal</subject><subject>Endocrinology</subject><subject>Epididymis - metabolism</subject><subject>Epididymis - pathology</subject><subject>Fasting</subject><subject>Females</subject><subject>Fibrosis</subject><subject>Gene expression</subject><subject>Genotype &amp; 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Pham, Vinh T ; Mori, Hiroyuki ; MacDougald, Ormond A ; Shah, Yatrik M ; Bodary, Peter F</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c692t-e42ee4f6b3a65cebd5eccfaabd82a403a94287f70d749504449c54db29874c653</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Adiponectin</topic><topic>Adiponectin - genetics</topic><topic>Adipose tissue</topic><topic>Adipose Tissue - metabolism</topic><topic>Adipose Tissue - pathology</topic><topic>Adiposity</topic><topic>Alpha iron</topic><topic>Analysis</topic><topic>Animals</topic><topic>Biology and Life Sciences</topic><topic>Blood Glucose - metabolism</topic><topic>Body fat</topic><topic>Cell death</topic><topic>Clustering</topic><topic>Complications</topic><topic>Cytokines</topic><topic>Deposition</topic><topic>Diabetes</topic><topic>Diet</topic><topic>Disease Models, Animal</topic><topic>Endocrinology</topic><topic>Epididymis - metabolism</topic><topic>Epididymis - pathology</topic><topic>Fasting</topic><topic>Females</topic><topic>Fibrosis</topic><topic>Gene expression</topic><topic>Genotype &amp; 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KK/HIJ (KK) mice, a polygenic obese mouse model, have elevated serum iron levels. A subset of KK male mice display a bronzing of epididymal adipose tissue (eAT) associated with &gt;100-fold (p&lt;0.001) higher iron concentration. To further phenotype and characterize the adipose tissue iron overload, 27 male KK mice were evaluated. 14 had bronzing eAT and 13 had normal appearing eAT. Fasting serum and tissues were collected for iron content, qPCR, histology and western blot. High iron levels were confirmed in bronzing eAT (High Iron group, HI) versus normal iron level (NI) in normal appearing eAT. Surprisingly, iron levels in subcutaneous and brown adipose depots were not different between the groups (p&gt;0.05). The eAT histology revealed iron retention, macrophage clustering, tissue fibrosis, cell death as well as accumulation of HIF-2α in the high iron eAT. qPCR showed significantly decreased Lep (leptin) and AdipoQ (adiponectin), whereas Tnfα (tumor necrosis factor α), and Slc40a1 (ferroportin) were up-regulated in HI (p&lt;0.05). Elevated HIF-2α, oxidative stress and local insulin signaling loss was also observed. Our data suggest that deposition of iron in adipose tissue is limited to the epididymal depot in male KK mice. A robust adipose tissue remodeling is concomitant with the high iron concentration, which causes local adipose tissue insulin resistance.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>28651003</pmid><doi>10.1371/journal.pone.0179889</doi><tpages>e0179889</tpages><orcidid>https://orcid.org/0000-0001-8249-0178</orcidid><oa>free_for_read</oa></addata></record>
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subjects Adiponectin
Adiponectin - genetics
Adipose tissue
Adipose Tissue - metabolism
Adipose Tissue - pathology
Adiposity
Alpha iron
Analysis
Animals
Biology and Life Sciences
Blood Glucose - metabolism
Body fat
Cell death
Clustering
Complications
Cytokines
Deposition
Diabetes
Diet
Disease Models, Animal
Endocrinology
Epididymis - metabolism
Epididymis - pathology
Fasting
Females
Fibrosis
Gene expression
Genotype & phenotype
Health aspects
Histology
Homeostasis
Hypoxia
Insulin
Insulin Resistance
Internal medicine
Iron
Iron - metabolism
Iron content
Iron Overload - genetics
Iron Overload - metabolism
Iron Overload - pathology
Kinesiology
Leptin
Leptin - genetics
Macrophages
Male
Males
Medicine and Health Sciences
Metabolism
Mice
Mice, Mutant Strains
Nickel
Nutrition research
Obesity
Obesity - genetics
Obesity - metabolism
Obesity - pathology
Oxidative stress
Pathology
Physiology
Remodeling
Research and Analysis Methods
Risk factors
Rodents
Stress concentration
Studies
Tissue Distribution
Tissues
Tumor necrosis factor
Type 2 diabetes
title Iron elevation and adipose tissue remodeling in the epididymal depot of a mouse model of polygenic obesity
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