Melatonin protects against methotrexate-induced memory deficit and hippocampal neurogenesis impairment in a rat model.

Abstract:

:Methotrexate (MTX) is a chemotherapy agent linked to cognitive deficits in cancer patients received chemotherapy treatment. MTX decreases cell proliferation in the hippocampus, which is concomitant with cognitive deficits in animal models. The present study aimed to investigate the disadvantages of MTX on cognition associated with cell division, survival, and immature neurons involved in hippocampal neurogenesis, as well as the practical neuroprotective effects of melatonin. Male Sprague Dawley rats were given two injections of MTX (75 mg/kg) on days 8 and 15 followed by Leucovorin (LCV, 6 mg/kg) at hours 18, 26, 42, 50 via i.p. injection. Some rats received co-treatment with melatonin (8 mg/kg, i.p. injection) for 15 days before and during MTX administration (preventive), 15 days after MTX administration (recovery), or both (30 days total; throughout). Hippocampal-dependent memory was examined using novel objection location (NOL) and novel object recognition (NOR) tests. Cell division, survival and immature neurons in the subgranular zone (SGZ) in the hippocampus were evaluated using immunofluorescence staining. Rats given MTX/LCV were found to have cognitive memory deterioration based on the NOL and NOR tests. Moreover, reductions in cell division, cell survival, and the numbers of immature neurons were detected in the MTX/LCV group when compared to the controls. This damage was not observed in rats in the preventive, recovery, or throughout groups. These findings reveal that melatonin has the potential to diminish the negative effects of MTX on memory and neurogenesis. This also indicates the benefit of melatonin co-administration in patients who undergo chemotherapy treatment.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Sirichoat A,Krutsri S,Suwannakot K,Aranarochana A,Chaisawang P,Pannangrong W,Wigmore P,Welbat JU

doi

10.1016/j.bcp.2019.02.010

subject

Has Abstract

pub_date

2019-05-01 00:00:00

pages

225-233

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(19)30048-6

journal_volume

163

pub_type

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