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Article

Aging reduces kisspeptin receptor (GPR54) expression levels in the hypothalamus and extra‑hypothalamic brain regions

  • Authors:
    • Ushodaya Mattam
    • Noble Kumar Talari
    • Venkata Ramana Thiriveedi
    • Mohammed Fareed
    • Sathya Velmurugan
    • Kalyankar Mahadev
    • Naresh Babu V. Sepuri
  • View Affiliations / Copyright

    Affiliations: Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad, Telangana 500046, India, National Institute of Animal Biotechnology, University of Hyderabad, Hyderabad, Telangana 500046, India, School of Medical Sciences, University of Hyderabad, Hyderabad, Telangana 500046, India
  • Article Number: 1019
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    Published online on: July 15, 2021
       https://doi.org/10.3892/etm.2021.10451
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Abstract

Aging leads to the diminished pulsatile secretion of hypothalamic gonadotropin‑releasing hormone (GnRH). Kisspeptin (Kp), the upstream regulator of the hypothalamic‑pituitary‑gonadal (HPG) axis, regulates GnRH synthesis and release through its cognate receptor, G‑protein coupled receptor 54 (GPR54). In turn, GnRH regulates GPR54 expression. GnRH administration into the third ventricle has been shown to induce neurogenesis in different brain regions in old age. However, aging‑associated changes in hypothalamic and extra‑hypothalamic GPR54 expression were unclear. Therefore, the expression levels of GPR54 were evaluated in various brain regions of adult (age, 3‑4 months) and old (age, 20‑24 months) male Wistar rats in the present study. In the hypothalamus, mRNA and protein levels of Kp and GPR54 were identified to be significantly decreased in old age. Furthermore, GnRH1 expression in the hypothalamus was analyzed to observe the functional consequence of a reduced Kp‑GPR54 system in the hypothalamus. It was found that hypothalamic GnRH1 levels were significantly decreased in old age. As GnRH regulates GPR54 levels, GPR54 was examined in extra‑hypothalamic regions. GPR54 levels were found to be significantly decreased in the hippocampus and medulla and pons in old‑age rats when compared to adult rats. Notably, GPR54 expression was observed in the frontal lobe, cortex, midbrain and cerebellum of adult and old‑age rats; however, the difference between the two groups was not statistically significant. To the best of our knowledge, this is the first study that provides the quantitative distribution of GPR54 in different brain regions during aging. Thus, the reduced levels of Kp and its receptor, GPR54 in the hypothalamus could be cumulatively responsible for reduced levels of GnRH observed in old age.
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Copy and paste a formatted citation
Spandidos Publications style
Mattam U, Talari NK, Thiriveedi VR, Fareed M, Velmurugan S, Mahadev K and Sepuri NV: Aging reduces kisspeptin receptor (GPR54) expression levels in the hypothalamus and extra‑hypothalamic brain regions. Exp Ther Med 22: 1019, 2021.
APA
Mattam, U., Talari, N.K., Thiriveedi, V.R., Fareed, M., Velmurugan, S., Mahadev, K., & Sepuri, N.V. (2021). Aging reduces kisspeptin receptor (GPR54) expression levels in the hypothalamus and extra‑hypothalamic brain regions. Experimental and Therapeutic Medicine, 22, 1019. https://doi.org/10.3892/etm.2021.10451
MLA
Mattam, U., Talari, N. K., Thiriveedi, V. R., Fareed, M., Velmurugan, S., Mahadev, K., Sepuri, N. V."Aging reduces kisspeptin receptor (GPR54) expression levels in the hypothalamus and extra‑hypothalamic brain regions". Experimental and Therapeutic Medicine 22.3 (2021): 1019.
Chicago
Mattam, U., Talari, N. K., Thiriveedi, V. R., Fareed, M., Velmurugan, S., Mahadev, K., Sepuri, N. V."Aging reduces kisspeptin receptor (GPR54) expression levels in the hypothalamus and extra‑hypothalamic brain regions". Experimental and Therapeutic Medicine 22, no. 3 (2021): 1019. https://doi.org/10.3892/etm.2021.10451
Copy and paste a formatted citation
x
Spandidos Publications style
Mattam U, Talari NK, Thiriveedi VR, Fareed M, Velmurugan S, Mahadev K and Sepuri NV: Aging reduces kisspeptin receptor (GPR54) expression levels in the hypothalamus and extra‑hypothalamic brain regions. Exp Ther Med 22: 1019, 2021.
APA
Mattam, U., Talari, N.K., Thiriveedi, V.R., Fareed, M., Velmurugan, S., Mahadev, K., & Sepuri, N.V. (2021). Aging reduces kisspeptin receptor (GPR54) expression levels in the hypothalamus and extra‑hypothalamic brain regions. Experimental and Therapeutic Medicine, 22, 1019. https://doi.org/10.3892/etm.2021.10451
MLA
Mattam, U., Talari, N. K., Thiriveedi, V. R., Fareed, M., Velmurugan, S., Mahadev, K., Sepuri, N. V."Aging reduces kisspeptin receptor (GPR54) expression levels in the hypothalamus and extra‑hypothalamic brain regions". Experimental and Therapeutic Medicine 22.3 (2021): 1019.
Chicago
Mattam, U., Talari, N. K., Thiriveedi, V. R., Fareed, M., Velmurugan, S., Mahadev, K., Sepuri, N. V."Aging reduces kisspeptin receptor (GPR54) expression levels in the hypothalamus and extra‑hypothalamic brain regions". Experimental and Therapeutic Medicine 22, no. 3 (2021): 1019. https://doi.org/10.3892/etm.2021.10451
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