Therapeutic Efficacy of Antioxidants in Ameliorating Obesity Phenotype and Associated Comorbidities.

adipocytes antioxidants cardiovascular disease diabetes obesity oxidative stress

Journal

Frontiers in pharmacology
ISSN: 1663-9812
Titre abrégé: Front Pharmacol
Pays: Switzerland
ID NLM: 101548923

Informations de publication

Date de publication:
2020
Historique:
received: 07 07 2020
accepted: 28 07 2020
entrez: 9 9 2020
pubmed: 10 9 2020
medline: 10 9 2020
Statut: epublish

Résumé

Obesity has been a worldwide epidemic for decades. Despite the abundant increase in knowledge regarding the etiology and pathogenesis of obesity, the prevalence continues to rise with estimates predicting considerably higher numbers by the year 2030. Obesity is characterized by an abnormal lipid accumulation, however, the physiological consequences of obesity are far more concerning. The development of the obesity phenotype constitutes dramatic alterations in adipocytes, along with several other cellular mechanisms which causes substantial increase in systemic oxidative stress mediated by reactive oxygen species (ROS). These alterations promote a chronic state of inflammation in the body caused by the redox imbalance. Together, the systemic oxidative stress and chronic inflammation plays a vital role in maintaining the obese state and exacerbating onset of cardiovascular complications, Type II diabetes mellitus, dyslipidemia, non-alcoholic steatohepatitis, and other conditions where obesity has been linked as a significant risk factor. Because of the apparent role of oxidative stress in the pathogenesis of obesity, there has been a growing interest in attenuating the pro-oxidant state in obesity. Hence, this review aims to highlight the therapeutic role of antioxidants, agents that negate pro-oxidant state of cells, in ameliorating obesity and associated comorbidities. More specifically, this review will explore how various antioxidants target unique and diverse pathways to exhibit an antioxidant defense mechanism.

Identifiants

pubmed: 32903449
doi: 10.3389/fphar.2020.01234
pmc: PMC7438597
doi:

Types de publication

Journal Article Review

Langues

eng

Pagination

1234

Subventions

Organisme : NHLBI NIH HHS
ID : R15 HL150721
Pays : United States

Informations de copyright

Copyright © 2020 Tun, Spainhower, Cottrill, Lakhani, Pillai, Dilip, Chaudhry, Shapiro and Sodhi.

Références

J Altern Complement Med. 2011 Sep;17(9):827-33
pubmed: 21875351
J Am Assoc Nurse Pract. 2017 Oct;29(S1):S3-S14
pubmed: 29024553
Cardiovasc Diabetol. 2011 May 21;10:43
pubmed: 21600014
Diabetes Res Clin Pract. 2018 Aug;142:363-373
pubmed: 29940201
Redox Biol. 2020 Jan;28:101315
pubmed: 31505325
Obes Rev. 2018 Mar;19(3):406-420
pubmed: 29243339
J Immunol. 2004 Apr 15;172(8):4744-51
pubmed: 15067050
J Agric Food Chem. 2010 Oct 13;58(19):10768-73
pubmed: 20843083
Biochem Biophys Res Commun. 2011 Jun 17;409(4):769-74
pubmed: 21621511
Child Obes. 2018 May/Jun;14(4):207-217
pubmed: 29762052
Clin Chest Med. 2010 Dec;31(4):659-73
pubmed: 21047574
Nutrients. 2018 Oct 17;10(10):
pubmed: 30336572
Biochim Biophys Acta. 2000 Apr 17;1496(2-3):183-95
pubmed: 10771087
Klin Med (Mosk). 2016;94(7):509-17
pubmed: 30289215
J Biol Chem. 1995 Oct 20;270(42):24995-5000
pubmed: 7559628
Curr Pharm Des. 2018;24(20):2229-2235
pubmed: 30014798
Int J Med Sci. 2016 Jan 01;13(1):25-38
pubmed: 26816492
Curr Opin Clin Nutr Metab Care. 2010 Jul;13(4):371-6
pubmed: 20531178
Diabetologia. 2019 Nov;62(11):2094-2105
pubmed: 31309261
J Chem Biol. 2015 Jan 20;8(2):45-59
pubmed: 25870713
Am J Respir Crit Care Med. 2013 Aug 1;188(3):279-84
pubmed: 23905522
Gene Ther. 2014 Sep;21(9):840-8
pubmed: 25030609
Appl Physiol Nutr Metab. 2011 Aug;36(4):570-6
pubmed: 21838602
Br J Pharmacol. 2013 May;169(1):69-81
pubmed: 23373714
Blood Vessels. 1991;28(1-3):52-61
pubmed: 1848126
Physiol Rev. 2018 Oct 1;98(4):1911-1941
pubmed: 30067159
Br J Nutr. 2008 Jan;99(1):37-43
pubmed: 17651528
Obesity (Silver Spring). 2009 Oct;17(10):1872-7
pubmed: 19629053
J Biol Chem. 2009 Apr 17;284(16):10601-9
pubmed: 19237544
Curr Opin Pharmacol. 2017 Dec;37:35-40
pubmed: 28843953
Nutr Rev. 2019 Jan 1;77(1):32-45
pubmed: 30202882
Cell. 2006 Dec 15;127(6):1109-22
pubmed: 17112576
Mol Vis. 2009;15:855-60
pubmed: 19390643
Antioxid Redox Signal. 2012 Feb 1;16(3):229-43
pubmed: 21902452
Antioxid Redox Signal. 2011 Sep 15;15(6):1583-606
pubmed: 21473702
Nutrients. 2018 Dec 04;10(12):
pubmed: 30518135
Front Pharmacol. 2012 Mar 16;3:47
pubmed: 22438844
J Biol Chem. 1991 Apr 5;266(10):6188-94
pubmed: 2007576
Ann Rheum Dis. 2008 Jul;67(7):909-16
pubmed: 17827184
Trends Biochem Sci. 2015 Aug;40(8):435-45
pubmed: 26067716
Lipids Health Dis. 2011 Feb 27;10:37
pubmed: 21352586
Genes Nutr. 2009 Sep;4(3):215-22
pubmed: 19707810
J Biol Chem. 2017 Oct 13;292(41):16810-16816
pubmed: 28842500
Eur J Clin Nutr. 2011 Jul;65(7):808-17
pubmed: 21427737
Drug Metab Dispos. 2004 Feb;32(2):205-11
pubmed: 14744942
Proc Natl Acad Sci U S A. 2010 Aug 31;107(35):15565-70
pubmed: 20713697
Front Biosci (Landmark Ed). 2011 Jun 01;16:2372-88
pubmed: 21622183
Front Microbiol. 2019 Apr 03;10:660
pubmed: 31001233
Lipids Health Dis. 2019 May 17;18(1):115
pubmed: 31101130
J Diabetes Res. 2017;2017:9603924
pubmed: 29359167
Int J Mol Sci. 2019 May 22;20(10):
pubmed: 31121826
Int J Vitam Nutr Res. 2004 Jan;74(1):11-20
pubmed: 15060896
Hypertension. 2012 Aug;60(2):467-75
pubmed: 22753217
Int J Mol Sci. 2015 Dec 18;16(12):30269-308
pubmed: 26694382
J Pediatr (Rio J). 2007 Nov;83(5 Suppl):S192-203
pubmed: 17989837
Korean J Intern Med. 2015 Sep;30(5):571-9
pubmed: 26354050
Annu Rev Pharmacol Toxicol. 2010;50:323-54
pubmed: 20055707
Pharm Res. 2016 Aug;33(8):2033-42
pubmed: 27161488
J Biol Chem. 2012 Feb 10;287(7):4403-10
pubmed: 22147704
Front Pharmacol. 2012 Jul 19;3:119
pubmed: 22833723
J Clin Biochem Nutr. 2011 Nov;49(3):159-63
pubmed: 22128213
Diabetes Care. 2004 Feb;27(2):362-6
pubmed: 14747214
Front Pharmacol. 2017 Jul 05;8:444
pubmed: 28725195
J Pharmacol Exp Ther. 2006 Dec;319(3):1144-52
pubmed: 16959961
J Clin Invest. 2011 Jun;121(6):2094-101
pubmed: 21633177
Methods Mol Biol. 2018;1852:57-71
pubmed: 30109624
Vasc Health Risk Manag. 2009;5:767-74
pubmed: 19774218
Hepat Med. 2013 Mar 04;5:11-6
pubmed: 24695939
Biochem Biophys Res Commun. 2005 Jul 1;332(2):392-7
pubmed: 15896707
Syst Rev. 2017 May 12;6(1):96
pubmed: 28499416
Open Access Maced J Med Sci. 2019 Dec 10;7(23):4066-4068
pubmed: 32165953
Lipids. 2013 May;48(5):449-55
pubmed: 23516000
Am J Clin Nutr. 2007 Mar;85(3):762-9
pubmed: 17344498
Probl Endokrinol (Mosk). 1993 Mar-Apr;39(2):9-11
pubmed: 8016060
J Biol Chem. 2009 Oct 9;284(41):28172-9
pubmed: 19700409
J Nutr. 2014 Feb;144(2):193-201
pubmed: 24353344
Fed Proc. 1979 Jan;38(1):66-71
pubmed: 215463
PLoS One. 2015 Jun 22;10(6):e0128648
pubmed: 26098879
Sultan Qaboos Univ Med J. 2014 May;14(2):e157-65
pubmed: 24790736
Biochem Pharmacol. 2016 Nov 1;119:8-16
pubmed: 27179976
J Cell Physiol. 2003 Jun;195(3):373-82
pubmed: 12704646
Int J Mol Sci. 2017 Jun 21;18(6):
pubmed: 28635626
Metab Syndr Relat Disord. 2015 Dec;13(10):423-44
pubmed: 26569333
Ann N Y Acad Sci. 1965 Oct 8;131(1):324-33
pubmed: 5216972
Trends Biochem Sci. 2003 Jan;28(1):32-40
pubmed: 12517450
Bull Cancer. 2019 Jul - Aug;106(7-8):635-646
pubmed: 31227175
Cell Signal. 2018 Dec;52:48-64
pubmed: 30172025
J Physiol. 2006 Oct 1;576(Pt 1):279-88
pubmed: 16840514
Am J Clin Nutr. 2012 Nov;96(5):1234S-44S
pubmed: 23053549
Circ Res. 2010 Dec 10;107(12):1490-7
pubmed: 21030713
Free Radic Biol Med. 2018 Aug 1;123:27-38
pubmed: 29777756
Sci Rep. 2020 Feb 13;10(1):2565
pubmed: 32054943
FASEB J. 2015 Dec;29(12):4766-71
pubmed: 26253366
J Nutr Biochem. 2006 Nov;17(11):766-72
pubmed: 16563718
FEBS Lett. 2010 Aug 4;584(15):3242-9
pubmed: 20542036
Br J Nutr. 2009 Jul;102(2):242-8
pubmed: 19173766
Arch Biochem Biophys. 2012 Mar 1;519(1):59-65
pubmed: 22289788
Am J Hypertens. 2003 Jul;16(7):577-84
pubmed: 12850392
Molecules. 2010 Mar 24;15(4):2103-13
pubmed: 20428030
Circulation. 2017 Aug 15;136(7):646-660
pubmed: 28487393
Oxid Med Cell Longev. 2020 May 8;2020:1954398
pubmed: 32454933
Obesity (Silver Spring). 2016 Nov;24(11):2301-2310
pubmed: 27804267
Gut. 2015 Jun;64(6):872-83
pubmed: 25080446
Compr Physiol. 2018 Dec 13;9(1):1-58
pubmed: 30549014
J Intern Med. 1999 Oct;246(4):409-18
pubmed: 10583712
Diabetes Res Clin Pract. 1999 Sep;45(2-3):183-90
pubmed: 10588371
Front Pharmacol. 2014 May 27;5:115
pubmed: 24904418
FEBS J. 2009 May;276(9):2469-77
pubmed: 19476488
Pathol Int. 2018 Feb;68(2):91-101
pubmed: 29341349
Diabetes. 2008 Jun;57(6):1526-35
pubmed: 18375438
Int J Inflam. 2011;2011:376909
pubmed: 21941676
Biochim Biophys Acta Mol Basis Dis. 2017 May;1863(5):1066-1077
pubmed: 27836629
Eur J Nutr. 2015 Mar;54(2):251-63
pubmed: 24791752
Int J Mol Sci. 2018 Sep 13;19(9):
pubmed: 30217101
Proc Natl Acad Sci U S A. 1997 Sep 30;94(20):10919-24
pubmed: 9380735
Heart. 2007 Aug;93(8):903-7
pubmed: 16670100
Food Funct. 2019 Feb 20;10(2):514-528
pubmed: 30746536
Biochem Biophys Res Commun. 2001 Oct 12;287(5):1121-4
pubmed: 11587538
Adv Nutr. 2018 Jul 1;9(4):465-492
pubmed: 30032230
Int J Mol Sci. 2020 Feb 13;21(4):
pubmed: 32069845
Vasc Health Risk Manag. 2016 Jul 14;12:287-95
pubmed: 27471391
Blood Adv. 2020 Jan 28;4(2):312-321
pubmed: 31978215
Int J Mol Sci. 2018 Sep 03;19(9):
pubmed: 30177600
Free Radic Biol Med. 2011 Jul 15;51(2):539-51
pubmed: 21620957
J Pharmacol Exp Ther. 2008 Jun;325(3):833-40
pubmed: 18334666
Nature. 1998 Oct 22;395(6704):763-70
pubmed: 9796811
Free Radic Biol Med. 2009 Aug 15;47(4):344-56
pubmed: 19477268
J Clin Cell Immunol. 2013 Mar 14;4(137):
pubmed: 23977443
Eur J Pharmacol. 2006 Aug 14;543(1-3):151-7
pubmed: 16814277
Front Endocrinol (Lausanne). 2016 Dec 12;7:157
pubmed: 28018292
Antioxid Redox Signal. 2019 Aug 10;31(5):387-402
pubmed: 31007045
Kidney Int. 2006 Aug;70(3):432-43
pubmed: 16775600
Br J Pharmacol. 2009 Apr;156(8):1256-66
pubmed: 19226281
J Clin Invest. 2007 Sep;117(9):2621-37
pubmed: 17717599
Phys Chem Chem Phys. 2018 Jan 31;20(5):3795-3804
pubmed: 29349456
J Immunol. 2009 Mar 15;182(6):3809-18
pubmed: 19265160
J Clin Endocrinol Metab. 2010 Jun;95(6):2993-3001
pubmed: 20392866
Minerva Med. 2017 Jun;108(3):212-228
pubmed: 28150485
Circulation. 2001 Dec 18;104(25):3052-6
pubmed: 11748099
Drugs R D. 2013 Sep;13(3):199-205
pubmed: 24048773
Free Radic Biol Med. 2016 Jul;96:89-98
pubmed: 27083477
Immune Netw. 2009 Feb;9(1):12-9
pubmed: 20107533
Cell Metab. 2013 Oct 1;18(4):470-7
pubmed: 23954640
Prog Lipid Res. 2003 Sep;42(5):405-22
pubmed: 12814643
Biochem Pharmacol. 2010 Dec 15;80(12):1895-903
pubmed: 20643109
Nat Rev Mol Cell Biol. 2012 Mar 07;13(4):225-238
pubmed: 22395773
Hypertens Res. 2006 Dec;29(12):1021-7
pubmed: 17378375
Am J Clin Nutr. 2006 Feb;83(2):456S-460S
pubmed: 16470012
Clin Biochem. 2015 Nov;48(16-17):1200-8
pubmed: 25920891
J Nutr Biochem. 2016 Jan;27:193-202
pubmed: 26456563
Lipids Health Dis. 2012 Sep 10;11:112
pubmed: 22962999
Circulation. 2005 Aug 16;112(7):1030-9
pubmed: 16087796
Nutrients. 2019 Jan 11;11(1):
pubmed: 30641865
J Lipid Res. 2018 Jul;59(7):1132-1147
pubmed: 29716959
Mol Cells. 2016 Jan;39(1):1-5
pubmed: 26831451
Rheumatology (Oxford). 2008 Apr;47(4):409-14
pubmed: 18187523
Lipids Health Dis. 2010 Mar 06;9:23
pubmed: 20205925
Biochem Pharmacol. 2006 Nov 30;72(11):1605-21
pubmed: 16889756
Front Cardiovasc Med. 2020 Feb 25;7:22
pubmed: 32158768
Hypertension. 2010 Dec;56(6):1124-30
pubmed: 21041703
Altern Med Rev. 2001 Jun;6(3):248-71
pubmed: 11410071
Eur J Immunol. 2015 Sep;45(9):2446-56
pubmed: 26220361
N Engl J Med. 2010 Dec 2;363(23):2211-9
pubmed: 21121834
Curr Opin Hematol. 2013 Sep;20(5):437-44
pubmed: 23817170
Clin Sci (Lond). 2011 Jun;120(12):493-504
pubmed: 21355854
Free Radic Biol Med. 2002 Aug 1;33(3):337-49
pubmed: 12126755
Exp Ther Med. 2019 Nov;18(5):3383-3388
pubmed: 31602212
J Cardiovasc Risk. 1998 Oct-Dec;5(5-6):339-45
pubmed: 9920007
Nutrients. 2018 Dec 25;11(1):
pubmed: 30585192
Free Radic Biol Med. 2010 Jan 1;48(1):161-72
pubmed: 19854266
Int J Environ Res Public Health. 2019 Oct 01;16(19):
pubmed: 31581468
Br J Nutr. 2008 Jul;100(1):18-26
pubmed: 18081944
Free Radic Res. 2018 Dec;52(11-12):1296-1310
pubmed: 29502477
Free Radic Biol Med. 2010 Aug 15;49(4):667-73
pubmed: 20561604
Free Radic Biol Med. 1995 Nov;19(5):617-26
pubmed: 8529921
Annu Rev Nutr. 2010 Aug 21;30:173-99
pubmed: 20420526
Clin Chem. 2007 Mar;53(3):511-9
pubmed: 17272491
J Am Coll Cardiol. 2017 Jul 11;70(2):212-229
pubmed: 28683969
Diabetes. 2012 May;61(5):1112-21
pubmed: 22396202
J Appl Physiol (1985). 2013 Aug 15;115(4):514-24
pubmed: 23722706
Arzneimittelforschung. 1992 May;42(5):642-5
pubmed: 1530678
IUBMB Life. 2019 Apr;71(4):487-494
pubmed: 30501009
Life Sci. 2018 Jan 1;192:26-32
pubmed: 29155300
J Biol Chem. 2015 Oct 16;290(42):25356-73
pubmed: 26318452
Obesity (Silver Spring). 2015 Aug;23(8):1598-606
pubmed: 26148343
Obesity (Silver Spring). 2016 Jan;24(1):148-56
pubmed: 26612356
Am J Physiol Endocrinol Metab. 2016 Oct 1;311(4):E730-E740
pubmed: 27577854
Arterioscler Thromb Vasc Biol. 1998 May;18(5):842-51
pubmed: 9598845
Mol Cell Biol. 1997 Mar;17(3):1552-61
pubmed: 9032283
Int J Mol Sci. 2011;12(10):6936-51
pubmed: 22072928
Biochim Biophys Acta. 1990 Apr 2;1043(2):189-97
pubmed: 2107879
J Med Invest. 2017;64(3.4):193-196
pubmed: 28954980
Cardiovasc Toxicol. 2011 Dec;11(4):373-81
pubmed: 21796404
Mol Cell Biochem. 1997 Jan;166(1-2):169-75
pubmed: 9046034
J Int Soc Sports Nutr. 2005 Dec 09;2:38-44
pubmed: 18500954
Biomed Pharmacother. 2018 Dec;108:656-662
pubmed: 30245465
Biomed Environ Sci. 2009 Feb;22(1):32-9
pubmed: 19462685
Nutrients. 2018 Nov 01;10(11):
pubmed: 30388871
Eur J Clin Nutr. 2014 Oct;68(10):1075-87
pubmed: 25074392
J Nutr Metab. 2014;2014:980547
pubmed: 25295182
Nutrients. 2019 Apr 13;11(4):
pubmed: 31013923
Sci Adv. 2015 Oct 16;1(9):e1500781
pubmed: 26601314
Int J Med Sci. 2018 Oct 20;15(14):1591-1599
pubmed: 30588181
Nutrients. 2012 Jun;4(6):467-90
pubmed: 22822447
Redox Biol. 2014 Feb 19;2:495-503
pubmed: 24624339
Eur J Clin Invest. 2016 Sep;46(9):757-65
pubmed: 27296149
Haematologica. 2015 Mar;100(3):308-14
pubmed: 25596265
Circulation. 2009 Jun 16;119(23):3017-27
pubmed: 19487598
Front Pharmacol. 2019 Jul 24;10:825
pubmed: 31396090
Am J Physiol Regul Integr Comp Physiol. 2012 Jan 15;302(2):R207-14
pubmed: 22071158
Toxicol Lett. 2005 Jul 4;157(3):175-88
pubmed: 15917143
Acta Biochim Pol. 2019 Feb 28;66(1):13-21
pubmed: 30816367
Diabetes. 2014 Oct;63(10):3210-20
pubmed: 24947358
J Biol Chem. 2014 Sep 26;289(39):26904-13
pubmed: 25122762
Physiol Rev. 2016 Oct;96(4):1449-508
pubmed: 27604527
J Biol Chem. 1992 Sep 5;267(25):18148-53
pubmed: 1517245
J Clin Endocrinol Metab. 2017 Jun 1;102(6):1983-1990
pubmed: 28323947
Mitochondrion. 2018 Jul;41:37-44
pubmed: 29221810
J Nutr. 1970 Nov;100(11):1307-15
pubmed: 5476433
Int J Mol Sci. 2019 Dec 21;21(1):
pubmed: 31877680
Circ Res. 2018 Dec 7;123(12):1339-1349
pubmed: 30566060
Redox Biol. 2015 Dec;6:198-205
pubmed: 26262996
World J Gastroenterol. 2007 Oct 14;13(38):5127-32
pubmed: 17876880
J Healthc Eng. 2018 Feb 1;2018:1564748
pubmed: 29599941
Sci Rep. 2014 Oct 28;4:6806
pubmed: 25348324
Am J Physiol Heart Circ Physiol. 2002 Sep;283(3):H861-70
pubmed: 12181112
Mol Metab. 2019 Jul;25:11-19
pubmed: 31005563
Food Funct. 2018 Sep 19;9(9):4651-4663
pubmed: 30183039
Sci Rep. 2017 Jan 19;7:40881
pubmed: 28102348
Mol Nutr Food Res. 2017 Jun;61(6):
pubmed: 28101967
Cell Rep. 2017 Jun 20;19(12):2451-2461
pubmed: 28636934
Fertil Steril. 2002 Jun;77(6):1128-35
pubmed: 12057717
Mayo Clin Proc. 2007 Jan;82(1):93-101; quiz 101-2
pubmed: 17285790
Cell J. 2017 Apr-Jun;19(1):11-17
pubmed: 28367412
Pharmacoeconomics. 2015 Jul;33(7):673-89
pubmed: 25471927
Biochim Biophys Acta. 2013 Aug;1830(8):4117-29
pubmed: 23618697
Antioxid Redox Signal. 2020 May 10;32(14):1061-1070
pubmed: 31880952
Exp Biol Med (Maywood). 2013 May;238(5):450-60
pubmed: 23856898

Auteurs

Steven Tun (S)

Departments of Medicine, Surgery and Biomedical Sciences, Marshall University Joan C. Edwards School of Medicine, Huntington, WV, United States.

Caleb James Spainhower (CJ)

Departments of Medicine, Surgery and Biomedical Sciences, Marshall University Joan C. Edwards School of Medicine, Huntington, WV, United States.

Cameron Lee Cottrill (CL)

Departments of Medicine, Surgery and Biomedical Sciences, Marshall University Joan C. Edwards School of Medicine, Huntington, WV, United States.

Hari Vishal Lakhani (HV)

Departments of Medicine, Surgery and Biomedical Sciences, Marshall University Joan C. Edwards School of Medicine, Huntington, WV, United States.

Sneha S Pillai (SS)

Departments of Medicine, Surgery and Biomedical Sciences, Marshall University Joan C. Edwards School of Medicine, Huntington, WV, United States.

Anum Dilip (A)

Departments of Medicine, Surgery and Biomedical Sciences, Marshall University Joan C. Edwards School of Medicine, Huntington, WV, United States.

Hibba Chaudhry (H)

Departments of Medicine, Surgery and Biomedical Sciences, Marshall University Joan C. Edwards School of Medicine, Huntington, WV, United States.

Joseph I Shapiro (JI)

Departments of Medicine, Surgery and Biomedical Sciences, Marshall University Joan C. Edwards School of Medicine, Huntington, WV, United States.

Komal Sodhi (K)

Departments of Medicine, Surgery and Biomedical Sciences, Marshall University Joan C. Edwards School of Medicine, Huntington, WV, United States.

Classifications MeSH