PMID- 34445359 OWN - NLM STAT- MEDLINE DCOM- 20210915 LR - 20210915 IS - 1422-0067 (Electronic) IS - 1422-0067 (Linking) VI - 22 IP - 16 DP - 2021 Aug 11 TI - From Menopause to Neurodegeneration-Molecular Basis and Potential Therapy. LID - 10.3390/ijms22168654 [doi] LID - 8654 AB - The impacts of menopause on neurodegenerative diseases, especially the changes in steroid hormones, have been well described in cell models, animal models, and humans. However, the therapeutic effects of hormone replacement therapy on postmenopausal women with neurodegenerative diseases remain controversial. The steroid hormones, steroid hormone receptors, and downstream signal pathways in the brain change with aging and contribute to disease progression. Estrogen and progesterone are two steroid hormones which decline in circulation and the brain during menopause. Insulin-like growth factor 1 (IGF-1), which plays an import role in neuroprotection, is rapidly decreased in serum after menopause. Here, we summarize the actions of estrogen, progesterone, and IGF-1 and their signaling pathways in the brain. Since the incidence of Alzheimer's disease (AD) is higher in women than in men, the associations of steroid hormone changes and AD are emphasized. The signaling pathways and cellular mechanisms for how steroid hormones and IGF-1 provide neuroprotection are also addressed. Finally, the molecular mechanisms of potential estrogen modulation on N-methyl-d-aspartic acid receptors (NMDARs) are also addressed. We provide the viewpoint of why hormone therapy has inconclusive results based on signaling pathways considering their complex response to aging and hormone treatments. Nonetheless, while diagnosable AD may not be treatable by hormone therapy, its preceding stage of mild cognitive impairment may very well be treatable by hormone therapy. FAU - Cheng, Yu-Jung AU - Cheng YJ AD - Department of Physical Therapy and Graduate Institute of Rehabilitation Science, China Medical University, Taichung 40402, Taiwan. AD - Department of Rehabilitation, China Medical University Hospital, Taichung 40402, Taiwan. FAU - Lin, Chieh-Hsin AU - Lin CH AD - Institute of Clinical Medical Science, China Medical University, Taichung 40402, Taiwan. AD - Graduate Institute of Biomedical Sciences, China Medical University, Taichung 40402, Taiwan. AD - Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung 83301, Taiwan. AD - School of Medicine, Chang Gung University, Taoyuan 33302, Taiwan. FAU - Lane, Hsien-Yuan AU - Lane HY AUID- ORCID: 0000-0003-2162-8174 AD - Institute of Clinical Medical Science, China Medical University, Taichung 40402, Taiwan. AD - Graduate Institute of Biomedical Sciences, China Medical University, Taichung 40402, Taiwan. AD - Department of Psychiatry & Brain Disease Research Center, China Medical University Hospital, Taichung 40402, Taiwan. AD - Department of Psychology, College of Medical and Health Sciences, Asia University, Taichung 41354, Taiwan. LA - eng GR - NHRI-EX110- 10816NC/National Health Research Institutes/ GR - MOST 109-2628-B-182A-002/Ministry of Science and Technology, Taiwan/ GR - 110-2314-B-182A-048 -/Ministry of Science and Technology, Taiwan/ GR - 108-2410-H-039-009-MY2/Ministry of Science and Technology, Taiwan/ GR - CMRPG8G1391/Chang Gung Memorial Hospital/ GR - CMRPG8K1161/Chang Gung Memorial Hospital/ GR - CMRPG8K1461/Chang Gung Memorial Hospital/ GR - CMU104-S-14-04/China Medical University, Taiwan/ PT - Journal Article PT - Review DEP - 20210811 PL - Switzerland TA - Int J Mol Sci JT - International journal of molecular sciences JID - 101092791 SB - IM MH - Aging/physiology MH - Alzheimer Disease/etiology/prevention & control MH - Animals MH - Brain/drug effects/physiology MH - Estrogen Replacement Therapy MH - Female MH - Humans MH - Menopause/drug effects/*physiology MH - *Nerve Degeneration/genetics/pathology/prevention & control/therapy MH - Postmenopause/drug effects/physiology/psychology MH - Risk Factors PMC - PMC8395405 OTO - NOTNLM OT - Alzheimer's disease OT - IGF-1 OT - NMDAR OT - estrogen OT - menopause OT - neurodegenerative disease COIS- The authors declare no conflict of interest. The sponsors were not involved in the design of the study; the collection, analysis, and interpretation of the data; the writing of the report; and the decision to submit the article for publication. EDAT- 2021/08/28 06:00 MHDA- 2021/09/16 06:00 PMCR- 2021/08/11 CRDT- 2021/08/27 01:23 PHST- 2021/07/26 00:00 [received] PHST- 2021/08/09 00:00 [revised] PHST- 2021/08/09 00:00 [accepted] PHST- 2021/08/27 01:23 [entrez] PHST- 2021/08/28 06:00 [pubmed] PHST- 2021/09/16 06:00 [medline] PHST- 2021/08/11 00:00 [pmc-release] AID - ijms22168654 [pii] AID - ijms-22-08654 [pii] AID - 10.3390/ijms22168654 [doi] PST - epublish SO - Int J Mol Sci. 2021 Aug 11;22(16):8654. doi: 10.3390/ijms22168654.