Abstract
Alterations in metabolic parameters have been associated with an increased risk of dementia, among which thyroid function has gained great importance in Alzheimer's disease (AD) pathology in recent years. However, it remains unclear whether thyroid dysfunctions could influence and contribute to the beginning and/or progression of AD or if it results from AD. This systematic review was conducted to examine the association between thyroid hormone (TH) levels and AD. Medline, ISI Web of Science, EMBASE, Cochrane library, Scopus, Scielo, and LILACS were searched, from January 2010 to March 2020. A total of 17 articles were selected. The studies reported alterations in TH and circadian rhythm in AD patients. Behavior, cognition, cerebral blood flow, and glucose consumption were correlated with TH deficits in AD patients. Whether thyroid dysfunctions and AD have a cause-effect relationship was inconclusive, however, the literature was able to provide enough data to corroborate a relationship between TH and AD. Although further studies are needed in this field, the current systematic review provides information that could help future investigations.
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Abdul-Rahman SA, Al Saied SS, Aly WW, Bastawy SA (2013) Dementia, thyroid function and serum level of S100B. Life Sci J 10:2633–2638
Accorroni A, Giorgi FS, Donzelli R, Lorenzini L, Prontera C, Saba A, Vergallo A, Tognoni G, Siciliano G, Baldacci F, Bonuccelli U, Clerico A, Zucchi R (2017) Thyroid hormone levels in the cerebrospinal fluid correlate with disease severity in euthyroid patients with Alzheimer’s disease. Endocrine 55:981–984
Alzoubi KH, Gerges NZ, Aleisa AM, Alkadhi KA (2009) Levothyroxin restores hypothyroidism-induced impairment of hippocampus-dependent learning and memory: Behavioral, electrophysiological, and molecular studies. Hippocampus 19:66–78
Ambrogini P, Cuppini R, Ferri P, Mancini C, Ciaroni S, Voci A, Gerdoni E, Gallo G (2005) Thyroid Hormones Affect Neurogenesis in the Dentate Gyrus of Adult Rat. Neuroendocrinology 81:244–253
Bárez-López S, Guadaño-Ferraz A (2017) Thyroid Hormone Availability and Action during Brain Development in Rodents. Front Cell Neurosci 11:240
Bavarsad, K., Hosseini, M., Hadjzadeh, M.A., Sahebkar, A., 2019. The effects of thyroid hormones on memory impairment and Alzheimer's disease. Journal of Cellular Physiology 234(9):14633-14640
Belandia B, Latasa MJ, Villa A, Pascual A (1998) Thyroid hormone negatively regulates the transcriptional activity of the beta-amyloid precursor protein gene. J Biol Chem 273:30366–30371
Benseñor IM, Lotufo PA, Menezes PR, Scazufca M (2010) Subclinical hyperthyroidism and dementia: the Sao Paulo Ageing & Health Study (SPAH). BMC Public Health 10:298
Bianco AC, Dumitrescu A, Gereben B, Ribeiro MO, Fonseca TL, Fernandes GW, Bocco B (2019) Paradigms of Dynamic Control of Thyroid Hormone Signaling. Endocr Rev 40:1000–1047
Biessels GJ, Kappelle LJ (2005) Increased risk of Alzheimer’s disease in Type II diabetes: insulin resistance of the brain or insulin-induced amyloid pathology? Biochem Soc Trans 33:1041–1044
Boucai L, Hollowell JG, Surks MI (2011) An approach for development of age-, gender-, and ethnicity-specific thyrotropin reference limits. Thyroid 21:5–11
Brabant G, Prank K, Ranft U, Schuermeyer T, Wagner TO, Hauser H, Kummer B, Feistner H, Hesch RD, von zur Mühlen A (1990) Physiological regulation of circadian and pulsatile thyrotropin secretion in normal man and woman. J Clin Endocrinol Metab 70:403–409
Camargo CHF, Bronzini A, Tolentino ES, Medyk C, Schultz-Pereira GL (2018) Can the CERAD neuropsychological battery be used to assess cognitive impairment in Parkinson’s disease? Arq Neuropsiquiatr 76:145–149
Chaalal A, Poirier R, Blum D, Laroche S, Enderlin V (2019) Thyroid Hormone Supplementation Restores Spatial Memory, Hippocampal Markers of Neuroinflammation, Plasticity-Related Signaling Molecules, and β-Amyloid Peptide Load in Hypothyroid Rats. Mol Neurobiol 56:722–735
Chang YS, Wu YH, Wang CJ, Tang SH, Chen HL (2018) Higher levels of thyroxine may predict a favorable response to donepezil treatment in patients with Alzheimer disease: A prospective, case-control study. BMC Neurosci 19:36
Chen JM, Huang CQ, Ai M, Kuang L (2013) Circadian rhythm of TSH levels in subjects with Alzheimer’s disease (AD). Aging Clin Exp Res 25:153–157
Chiaravalloti A, Ursini F, Fiorentini A, Barbagallo G, Martorana A, Koch G, Tavolozza M, Schillaci O (2017) Functional correlates of TSH, fT3 and fT4 in Alzheimer disease: a F-18 FDG PET/CT study. Sci Rep 7:6220
Cooper-Kazaz R, van der Deure WM, Medici M, Visser TJ, Alkelai A, Glaser B, Peeters RP, Lerer B (2009) Preliminary evidence that a functional polymorphism in type 1 deiodinase is associated with enhanced potentiation of the antidepressant effect of sertraline by triiodothyronine. J Affect Disord 116:113–116
Davis PJ, Goglia F, Leonard JL (2016) Nongenomic actions of thyroid hormone. Nat Rev Endocrinol 12:111–121
de Jong FJ, Masaki K, Chen H, Remaley AT, Breteler MMB, Petrovitch H, White LR, Launer LJ (2009) Thyroid function, the risk of dementia and neuropathologic changes: the Honolulu-Asia aging study. Neurobiol Aging 30:600–606
de la Monte SM, Wands JR (2005) Review of insulin and insulin-like growth factor expression, signaling, and malfunction in the central nervous system: relevance to Alzheimer’s disease. J Alzheimers Dis 7:45–61
Dratman MB, Crutchfield FL, Schoenhoff MB (1991) Transport of iodothyronines from bloodstream to brain: contributions by blood:brain and choroid plexus:cerebrospinal fluid barriers. Brain Res 554:229–236
Ehrenkranz J, Bach PR, Snow GL, Schneider A, Lee JL, Ilstrup S, Bennett ST, Benvenga S (2015) Circadian and Circannual Rhythms in Thyroid Hormones: Determining the TSH and Free T4 Reference Intervals Based Upon Time of Day, Age, and Sex. Thyroid 25:954–961
Eng L, Lam L (2020) Thyroid Function During the Fetal and Neonatal Periods. NeoReviews 21:e30–e36
Farbood Y, Shabani S, Sarkaki A, Mard SA, Ahangarpour A, Khorsandi L (2017) Peripheral and central administration of T3 improved the histological changes, memory and the dentate gyrus electrophysiological activity in an animal model of Alzheimer’s disease. Metab Brain Dis 32:693–701
Fillenbaum GG, van Belle G, Morris JC, Mohs RC, Mirra SS, Davis PC, Tariot PN, Silverman JM, Clark CM, Welsh-Bohmer KA, Heyman A (2008) Consortium to Establish a Registry for Alzheimer’s Disease (CERAD): the first twenty years. Alzheimers Dement 4:96–109
Haji M, Kimura N, Hanaoka T, Aso Y, Takemaru M, Hirano T, Matsubara E (2015) Evaluation of regional cerebral blood flow in Alzheimer’s disease patients with subclinical hypothyroidism. Dement Geriatr Cogn Disord 39:360–367
Heni M, Kullmann S, Preissl H, Fritsche A, Häring HU (2015) Impaired insulin action in the human brain: causes and metabolic consequences. Nat Rev Endocrinol 11:701–711
Henneberg N, Hoyer S (1995) Desensitization of the neuronal insulin receptor: a new approach in the etiopathogenesis of late-onset sporadic dementia of the Alzheimer type (SDAT)? Arch Gerontol Geriatr 21:63–74
Hildebrand P, Ensinck JW, Buettiker J, Drewe J, Burckhardt B, Gyr K, Beglinger C (1994) Circulating somatostatin-28 is not a physiologic regulator of gastric acid production in man. Eur J Clin Invest 24:50–56
Hollowell JG, Staehling NW, Flanders WD, Hannon WH, Gunter EW, Spencer CA, Braverman LE (2002) Serum TSH, T(4), and thyroid antibodies in the United States population (1988 to 1994): National Health and Nutrition Examination Survey (NHANES III). J Clin Endocrinol Metab 87:489–499
Hölscher C (2019) Insulin Signaling Impairment in the Brain as a Risk Factor in Alzheimer’s Disease. Front Aging Neurosci 11:88
Hu Y, Wang ZC, Guo QH, Cheng W, Chen YW (2016) Is thyroid status associated with cognitive impairment in elderly patients in China? BMC Endocr Disord 16:11
Huang W-J, Zhang X, Chen W-W (2016) Role of oxidative stress in Alzheimer’s disease. Biomed Rep 4:519–522
Jack CR Jr, Albert MS, Knopman DS, McKhann GM, Sperling RA, Carrillo MC, Thies B, Phelps CH (2011) Introduction to the recommendations from the National Institute on Aging-Alzheimer’s Association workgroups on diagnostic guidelines for Alzheimer’s disease. Alzheimers Dement 7:257–262
Jack CR Jr, Bennett DA, Blennow K, Carrillo MC, Dunn B, Haeberlein SB, Holtzman DM, Jagust W, Jessen F, Karlawish J, Liu E, Molinuevo JL, Montine T, Phelps C, Rankin KP, Rowe CC, Scheltens P, Siemers E, Snyder HM, Sperling R (2018) NIA-AA Research Framework: Toward a biological definition of Alzheimer’s disease. Alzheimers Dement 14:535–562
Jahagirdar V, McNay EC (2012) Thyroid hormone’s role in regulating brain glucose metabolism and potentially modulating hippocampal cognitive processes. Metab Brain Dis 27:101–111
Joffe BI, Distiller LA (2014) Diabetes mellitus and hypothyroidism: Strange bedfellows or mutual companions? World J Diabetes 5:901–904
Johansson P, Almqvist EG, Johansson JO, Mattsson N, Hansson O, Wallin A, Blennow K, Zetterberg H, Svensson J (2013) Reduced cerebrospinal fluid level of thyroxine in patients with Alzheimer’s disease. Psychoneuroendocrinology 38:1058–1066
Kalmijn S, Mehta KM, Pols HA, Hofman A, Drexhage HA, Breteler MM (2000) Subclinical hyperthyroidism and the risk of dementia. The Rotterdam Study Clin Endocrinol (oxf) 53:733–737
Kametani F, Hasegawa M (2018) Reconsideration of Amyloid Hypothesis and Tau Hypothesis in Alzheimer’s Disease. Front Neurosci 12:25–25
Kimura N, Kumamoto T, Masuda H, Hanaoka T, Okazaki T, Arakawa R (2011) Relationship between thyroid hormone levels and regional cerebral blood flow in Alzheimer’s disease. Alzheimer Dis Assoc Disord 25:138
Kinney JW, Bemiller SM, Murtishaw AS, Leisgang AM, Salazar AM, Lamb BT (2018) Inflammation as a central mechanism in Alzheimer’s disease. Alzheimers Dement (n y) 4:575–590
Kumar ASJ, Goyal A, Tsao JW (2020) Alzheimer Disease., StatPearls [Internet]. StatPearls Publishing, Treasure Island
La’ulu SL, Roberts WL (2011) Ethnic differences in first-trimester thyroid reference intervals. Clin Chem 57:913–915
Lanctôt KL, Amatniek J, Ancoli-Israel S, Arnold SE, Ballard C, Cohen-Mansfield J, Ismail Z, Lyketsos C, Miller DS, Musiek E, Osorio RS, Rosenberg PB, Satlin A, Steffens D, Tariot P, Bain LJ, Carrillo MC, Hendrix JA, Jurgens H, Boot B (2017) Neuropsychiatric signs and symptoms of Alzheimer’s disease: New treatment paradigms. Alzheimers Dement (n y) 3:440–449
Latasa MJ, Belandia B, Pascual A (1998) Thyroid hormones regulate beta-amyloid gene splicing and protein secretion in neuroblastoma cells. Endocrinology 139:2692–2698
Liu C-C, Li C-Y, Kung S-F, Kuo H-W, Huang N-C, Sun Y, Hu SC (2019) Association of Environmental Features and the Risk of Alzheimer’s Dementia in Older Adults: A Nationwide Longitudinal Case-Control Study. Int J Environ Res Public Health 16:2828
Madeira MD, Sousa N, Lima-Andrade MT, Calheiros F, Cadete-Leite A, Paula-Barbosa MM (1992) Selective vulnerability of the hippocampal pyramidal neurons to hypothyroidism in male and female rats. J Comp Neurol 322:501–518
Mahadevan S, Sadacharan D, Kannan S, Suryanarayanan A (2017) Does Time of Sampling or Food Intake Alter Thyroid Function Test? Indian J Endocrinol Metab 21:369–372
Mayeux R, Stern Y (2012) Epidemiology of Alzheimer disease. Cold Spring Harb Perspect Med 2:a006239
McKhann G, Drachman D, Folstein M, Katzman R, Price D, Stadlan EM (1984) Clinical diagnosis of Alzheimer’s disease: report of the NINCDS-ADRDA Work Group under the auspices of Department of Health and Human Services Task Force on Alzheimer’s Disease. Neurology 34:939–944
McKhann GM, Knopman DS, Chertkow H, Hyman BT, Jack CR Jr, Kawas CH, Klunk WE, Koroshetz WJ, Manly JJ, Mayeux R, Mohs RC, Morris JC, Rossor MN, Scheltens P, Carrillo MC, Thies B, Weintraub S, Phelps CH (2011) The diagnosis of dementia due to Alzheimer’s disease: recommendations from the National Institute on Aging-Alzheimer’s Association workgroups on diagnostic guidelines for Alzheimer’s disease. Alzheimers Dement 7:263–269
Mergenthaler P, Lindauer U, Dienel GA, Meisel A (2013) Sugar for the brain: the role of glucose in physiological and pathological brain function. Trends Neurosci 36:587–597
Moher D, Liberati A, Tetzlaff J, Altman DG (2009) Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement. PLoS Med 6:e1000067
Monsell SE, Mock C, Hassenstab J, Roe CM, Cairns NJ, Morris JC, Kukull W (2014) Neuropsychological changes in asymptomatic persons with Alzheimer disease neuropathology. Neurology 83:434–440
Moosavi M, Naghdi N, Maghsoudi N, Zahedi Asl S (2006) The effect of intrahippocampal insulin microinjection on spatial learning and memory. Horm Behav 50:748–752
Morris JC, Heyman A, Mohs RC, Hughes JP, van Belle G, Fillenbaum G, Mellits ED, Clark C (1989) The Consortium to Establish a Registry for Alzheimer’s Disease (CERAD). Part I. Clinical and neuropsychological assessment of Alzheimer’s disease. Neurology 39:1159–1165
Mosconi L (2013) Glucose metabolism in normal aging and Alzheimer's disease: Methodological and physiological considerations for PET studies. Clin Transl Imaging 1https://doi.org/10.1007/s40336-40013-40026-y
Moustafa AA, Hassan M, Hewedi DH, Hewedi I, Garami JK, Al Ashwal H, Zaki N, Seo SY, Cutsuridis V, Angulo SL, Natesh JY, Herzallah MM, Frydecka D, Misiak B, Salama M, Mohamed W, El Haj M, Hornberger M (2018) Genetic underpinnings in Alzheimer’s disease - a review. Rev Neurosci 29:21–38
Nair R, Mahadevan S, Muralidharan RS, Madhavan S (2014) Does fasting or postprandial state affect thyroid function testing? Indian J Endocrinol Metab 18:705–707
National Heart, L., and Blood Institute (NHLBI) (2014) Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies
Nomoto S, Kinno R, Ochiai H, Kubota S, Mori Y, Futamura A, Sugimoto A, Kuroda T, Yano S, Murakami H, Shirasawa T, Yoshimoto T, Minoura A, Kokaze A, Ono K (2019) The relationship between thyroid function and cerebral blood flow in mild cognitive impairment and Alzheimer’s disease. PLoS ONE 14:e0214676
Panveloski-Costa AC, Silva Teixeira S, Ribeiro IM, Serrano-Nascimento C, das Neves RX, Favaro RR, Seelaender M, Antunes VR, Nunes MT (2016) Thyroid hormone reduces inflammatory cytokines improving glycaemia control in alloxan-induced diabetic wistar rats. Acta physiologica (Oxford, England) 217:130–140
Prezioso G, Giannini C, Chiarelli F (2018) Effect of thyroid hormones on neurons and neurodevelopment. Horm Res Paediatr 90:73–81
Prieto-Almeida F, Panveloski-Costa AC, Crunfli F, da Silva Teixeira S, Nunes MT, da Silva Torrão A (2018) Thyroid hormone improves insulin signaling and reduces the activation of neurodegenerative pathway in the hippocampus of diabetic adult male rats. Life Sci 192:253–258
Qiu C, Kivipelto M, von Strauss E (2009) Epidemiology of Alzheimer’s disease: occurrence, determinants, and strategies toward intervention. Dialogues Clin Neurosci 11:111–128
Quinlan P, Horvath A, Wallin A, Svensson J (2019) Low serum concentration of free triiodothyronine (FT3) is associated with increased risk of Alzheimer’s disease. Psychoneuroendocrinology 99:112–119
Rabah SA, Gowan IL, Pagnin M, Osman N, Richardson SJ (2019) Thyroid Hormone Distributor Proteins During Development in Vertebrates. Front Endocrinol 10:506
Rachna A, Suman K, Neelam C, Alok K, Kumar DD, Bhushan TC (2013) A cross-sectional study on thyroid status in North Indian elderly outpatients with dementia. Ann Indian Acad Neurol 16:333–337
Raverot V, Bonjour M, Abeillon du Payrat J, Perrin P, Roucher-Boulez F, Lasolle H, Subtil F, Borson-Chazot F (2020) Age- and Sex-Specific TSH Upper-Limit Reference Intervals in the General French Population: There Is a Need to Adjust Our Actual Practices. J Clin Med 9:792
Raymaekers SR, Darras VM (2017) Thyroid hormones and learning-associated neuroplasticity. Gen Comp Endocrinol 247:26–33
Remaud S, Gothié JD, Morvan-Dubois G, Demeneix BA (2014) Thyroid hormone signaling and adult neurogenesis in mammals. Front Endocrinol (lausanne) 5:62
Román GC, Tatemichi TK, Erkinjuntti T, Cummings JL, Masdeu JC, Garcia JH, Amaducci L, Orgogozo JM, Brun A, Hofman A et al (1993) Vascular dementia: diagnostic criteria for research studies. Report of the NINDS-AIREN International Workshop. Neurology 43:250–260
Rosenberger AF, Hilhorst R, Coart E, García Barrado L, Naji F, Rozemuller AJ, van der Flier WM, Scheltens P, Hoozemans JJ, van der Vies SM (2016) Protein Kinase Activity Decreases with Higher Braak Stages of Alzheimer’s Disease Pathology. J Alzheimers Dis 49:927–943
Santos MC, Louzada RA, Souza EC, Fortunato RS, Vasconcelos AL, Souza KL, Castro JP, Carvalho DP, Ferreira AC (2013) Diabetes mellitus increases reactive oxygen species production in the thyroid of male rats. Endocrinology 154:1361–1372
Sarhat ER (2019) Altered serum marker of thyroid profile and antioxidant enzymes in individuals Alzheimer’s disease. Int Res J Pharm 10:56–60
Scheinberg P, Stead EA Jr, Brannon ES, Warren JV (1950) Correlative observations on cerebral metabolism and cardiac output in myxedema. J Clin Investig 29:1139–1146
Schroeder A, Privalsky M (2014) Thyroid Hormones, T3 and T4, in the Brain. Front Endocrinol 5:40
Sensenbach W, Madison L, Eisenberg S, Ochs L (1954) The cerebral circulation and metabolism in hyperthyroidism and myxedema. J Clin Investig 33:1434–1440
Shahid MA, Ashraf MA, Sharma S (2020) Physiology, thyroid hormone. StatPearls [Internet]
Spencer CA, Hollowell JG, Kazarosyan M, Braverman LE (2007) National Health and Nutrition Examination Survey III thyroid-stimulating hormone (TSH)-thyroperoxidase antibody relationships demonstrate that TSH upper reference limits may be skewed by occult thyroid dysfunction. J Clin Endocrinol Metab 92:4236–4240
Sperling RA, Aisen PS, Beckett LA, Bennett DA, Craft S, Fagan AM, Iwatsubo T, Jack CR Jr, Kaye J, Montine TJ, Park DC, Reiman EM, Rowe CC, Siemers E, Stern Y, Yaffe K, Carrillo MC, Thies B, Morrison-Bogorad M, Wagster MV, Phelps CH (2011) Toward defining the preclinical stages of Alzheimer’s disease: recommendations from the National Institute on Aging-Alzheimer’s Association workgroups on diagnostic guidelines for Alzheimer’s disease. Alzheimers Dement 7:280–292
Sui L, Anderson WL, Gilbert ME (2005) Impairment in short-term but enhanced long-term synaptic potentiation and ERK activation in adult hippocampal area CA1 following developmental thyroid hormone insufficiency. Toxicol Sci 85:647–656
Sui L, Wang J, Li BM (2008) Administration of triiodo-L-thyronine into dorsal hippocampus alters phosphorylation of Akt, mammalian target of rapamycin, p70S6 kinase and 4E-BP1 in rats. Neurochem Res 33:1065–1076
Surks MI, Hollowell JG (2007) Age-specific distribution of serum thyrotropin and antithyroid antibodies in the US population: implications for the prevalence of subclinical hypothyroidism. J Clin Endocrinol Metab 92:4575–4582
Sviridonova MA, Fadeyev VV, Sych YP, Melnichenko GA (2013) Clinical significance of TSH circadian variability in patients with hypothyroidism. Endocr Res 38:24–31
Swerdlow RH, Burns JM, Khan SM (2010) The Alzheimer’s disease mitochondrial cascade hypothesis. J Alzheimers Dis 20(Suppl 2):S265-279
Tan ZS, Beiser A, Vasan RS, Au R, Auerbach S, Kiel DP, Wolf PA, Seshadri S (2008) Thyroid function and the risk of Alzheimer disease: the Framingham Study. Arch Intern Med 168:1514–1520
Tanila H (2017) The role of BDNF in Alzheimer’s disease. Neurobiol Dis 97:114–118
Tobore TO (2019) On the central role of mitochondria dysfunction and oxidative stress in Alzheimer’s disease. Neurol Sci 40:1527–1540
Torres-Manzo AP, Franco-Colín M, Blas-Valdivia V, Pineda-Reynoso M, Cano-Europa E (2018) Hypothyroidism Causes Endoplasmic Reticulum Stress in Adult Rat Hippocampus: A Mechanism Associated with Hippocampal Damage. Oxid Med Cell Longev 2018:2089404
Ulusu NN, Yilmaz G, Erbayraktar Z, Evlice A, Genc M, Aras S, Avci A, Yener G (2015) A Comparative Study on Thyroid Function in Alzheimer’s Disease: Results From a Turkish Multi-Centre Study. Journal of Neurological Sciences-Turkish 32:335–347
Vadiveloo T, Donnan PT, Murphy MJ, Leese GP (2013) Age- and gender-specific TSH reference intervals in people with no obvious thyroid disease in Tayside, Scotland: the Thyroid Epidemiology, Audit, and Research Study (TEARS). J Clin Endocrinol Metab 98:1147–1153
Völzke H, Alte D, Kohlmann T, Lüdemann J, Nauck M, John U, Meng W (2005) Reference intervals of serum thyroid function tests in a previously iodine-deficient area. Thyroid 15:279–285
Wallis K, Dudazy S, van Hogerlinden M, Nordström K, Mittag J, Vennström B (2010) The thyroid hormone receptor alpha1 protein is expressed in embryonic postmitotic neurons and persists in most adult neurons. Mol Endocrinol 24:1904–1916
Wang X, Zheng W (2019) Ca(2+) homeostasis dysregulation in Alzheimer’s disease: a focus on plasma membrane and cell organelles. Faseb j 33:6697–6712
Yong-Hong L, Xiao-Dong P, Chang-Quan H, Bo Y, Qing-Xiu L (2013) Hypothalamic-pituitary-thyroid axis in patients with Alzheimer disease (AD). J Investig Med 61:578–581
Yoshihara A, Noh JY, Watanabe N, Iwaku K, Kunii Y, Ohye H, Suzuki M, Matsumoto M, Suzuki N, Sugino K, Thienpont LM, Hishinuma A, Ito K (2018) Seasonal Changes in Serum Thyrotropin Concentrations Observed from Big Data Obtained During Six Consecutive Years from 2010 to 2015 at a Single Hospital in Japan. Thyroid : Official Journal of the American Thyroid Association 28:429–436
Zhang N, Du HJ, Wang JH, Cheng Y (2012) A pilot study on the relationship between thyroid status and neuropsychiatric symptoms in patients with Alzheimer disease. Chin Med J 125:3211–3216
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This study was supported by the National Agency for Research and Development (ANID, Chile) with a fellowship grant awarded to Paulina BS Figueroa PhD (grant #72190107), and by The São Paulo Research Foundation (FAPESP, Brazil) with a fellowship grant awarded to Ana FF Ferreira PhD (Grant # 2020/02109-3). This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.
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PBSF, AFFF, and AST conceived the study. PBSF and AFFF performed the systematic search. AFFF and KHB performed the screening, data extraction process and analyzed the data. LRB, AD, and AST advised on methodology. PBSF and AFFF wrote the manuscript, which was revised critically by LRB, AD, and AST.
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Figueroa, P.B.S., Ferreira, A.F.F., Britto, L.R. et al. Association between thyroid function and Alzheimer's disease: A systematic review. Metab Brain Dis 36, 1523–1543 (2021). https://doi.org/10.1007/s11011-021-00760-1
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DOI: https://doi.org/10.1007/s11011-021-00760-1