Abstract
Homocysteine (Hcy) is a neurotoxicity amino acid that causes cognitive dysfunction. Hydrogen sulfide (H2S) is a neuroprotective gas molecular and can improve cognitive ability in a range of physiological concentrations. Our previous study confirmed that H2S (by its donor, NaHS) ameliorates cognitive impairment in Hcy-exposed rats, but the underlying mechanism has not been well elucidated. Accumulating evidence suggests that k252a, the furanosylated indolocarbazoleas, is usually used as the receptor tyrosine kinase B (TrkB) antagonist and blocks brain-derived neurotrophic factor (BDNF)/TrkB signaling, thus leading to cognitive decline. Interestingly, we previously demonstrated that k252a reversed H2S alleviated Hcy-induced endoplasmic reticulum stress and neuronal apoptosis via inhibiting BDNF-TrkB pathway. Therefore, we assumed that k252a might inhibit the protective effect of H2S on Hcy-induced cognitive dysfunction. We used Hcy to establish a rat model of cognitive impairment. We found that after administration of k252a by intracerebroventricular injection, the beneficial effect of H2S on Hcy-induced cognitive decline is abolished, as reflected by the increasing escape latency and time spent in the target quadrant in the Morris Water Maze (MWM) test as well as decreased spontaneous alternation in Y-maze test and the lower discrimination index in the Novel Object Recognition (NOR) test in rats co-treated with sodium hydrosulfide (NaHS, a donor of H2S), Hcy and k252a. Our findings suggested that k252a antagonized the effect of H2S on preventing Hcy-related cognitive decline. Our finding expands the understanding of the potential mechanism on the resistant role of H2S in Hcy-caused cognitive damage.
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This study was supported by the General Scientific Research Project of Hunan Provincial Department of Education (19C0650), Natural Science Foundation of China (81771178), and the Natural Science Youth Foundation of Hunan Province (2020JJ5147).
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Ethical approval. All procedures performed in studies involving rats were in accordance with the ethical standards of the National Institutes of Health Guide for the Care and Use of Laboratory Animals.
Conflicts of interest. The authors declared no conflict of interest.
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He, J., Wei, HJ., Li, M. et al. k252a Inhibits H2S-Alleviated Homocysteine-Induced Cognitive Dysfunction in Rats. Neurochem. J. 15, 308–316 (2021). https://doi.org/10.1134/S1819712421030053
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DOI: https://doi.org/10.1134/S1819712421030053
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Abbreviations:
- H2S, hydrogen sulfide
- NaHS, sodium hydrosulfide
- Hcy, homocystenine
- PBS, Phosphate Buffered Saline
- i.c.v., intracerebroventricular
- i.p., intraperitoneal
- MWM, Morris Water Maze
- BDNF, brain-derived neurotrophic factor
- PKC, protein kinase C
- TrkA, tyrosine kinase A
- TrkB, tyrosine kinase B
- NOR, novel object recognition
- DI, discrimination index
- AD, Alzheimer’s disease
- SD, Sprague–Dawley
- ACSF, artificial cerebrospinal fluid
- DMSO, dimethyl sulfoxide
- ANOVA, analysis of variance
- HSD, honestly significant difference
- CUMS, chronic unpredictable mild stress