Abstract
Clinical studies and experimental data together support a role for pituitary gonadotropins, including luteinizing hormone (LH), otherwise considered solely as fertility hormones, in age–related cognitive decline. Furthermore, rising levels of LH in post–menopausal women have been implicated in the high prevalence of mood disorders. This study was designed to examine the effect of deficient LH signaling on both cognitive and emotional behavior in 12–month–old Lhcgr−/− mice. For this, we established and validated a battery of five tests, including Dark–Light Box (DLB), Y–Maze Spontaneous Alternation, Novel Object Recognition (NOR), and contextual and cued Fear Conditioning (FCT) tests. We found that 12–month–old female wild type mice display a prominent anxiety phenotype on DLB and FCT. This phenotype was not seen in 12–month–old female Lhcgr−/− mice, indicating full phenotypic rescue. Furthermore, there was no effect of LHCGR depletion on recognition memory or working spatial memory on NOR and Y–maze testing, respectively, in 12–month–old mice, notwithstanding the absence of a basal phenotype in wild type littermates. The latter data do not exclude an effect of LH on cognition documented in previous studies. Finally, 12–month–old male mice and 3–month–old male and female mice did not consistently display deficits on any test. The data collectively document, for the first time, that loss of LH signaling reverses age–related emotional disturbances, a prelude to future targeted therapies that block LH action.
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Acknowledgements
Work at Icahn School of Medicine at Mount Sinai performed at the Center for Translational Medicine and Pharmacology was supported by fundings from the National Institute of Health (R01AG071870, R01AG074092 and U01AG073148 to M.Z. and T.Y.; and U19AG060917 and R01DK113627 to M.Z.).
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SS, VR, SM, HK, FK, SW and AG collected data. OB, AM, HK, TY and TF performed data analysis and statistical testing. KG, MZ, TY, DL and TF conceived and designed the study, authored manuscript, and supervised this work.
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MZ is inventor on issued and pending patients on the use of FSH as a target for osteoporosis, obesity and Alzheimer’s disease. MZ, TY and DL are inventors on a submitted patent application relating to the role of LH in regulating body composition. The patents will be held by Icahn School of Medicine at Mount Sinai, and MZ, TY and/or DL would be recipient of royalties, per institutional policy. The other authors declare no competing financial interests.
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Sims, S., Barak, O., Ryu, V. et al. Absent LH signaling rescues the anxiety phenotype in aging female mice. Mol Psychiatry 28, 3324–3331 (2023). https://doi.org/10.1038/s41380-023-02209-6
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DOI: https://doi.org/10.1038/s41380-023-02209-6
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