Short-term systemic methotrexate administration in rats induces astrogliosis and microgliosis.

Autor: Vazi EPG; Graduate Program in Environmental and Experimental Pathology, University Paulista, São Paulo, SP, Brazil., Holanda F; Department of Veterinary Medicine, University Cruzeiro do Sul, São Paulo, SP, Brazil., Santos NA; Graduate Program in Environmental and Experimental Pathology, University Paulista, São Paulo, SP, Brazil., Cardoso CV; Graduate Program in Environmental and Experimental Pathology, University Paulista, São Paulo, SP, Brazil., Martins MFM; Department of Veterinary Medicine, University Cruzeiro do Sul, São Paulo, SP, Brazil., Bondan EF; Graduate Program in Environmental and Experimental Pathology, University Paulista, São Paulo, SP, Brazil; Department of Veterinary Medicine, University Cruzeiro do Sul, São Paulo, SP, Brazil. Electronic address: eduardo.bondan@docente.unip.br.
Jazyk: angličtina
Zdroj: Research in veterinary science [Res Vet Sci] 2021 Sep; Vol. 138, pp. 39-48. Date of Electronic Publication: 2021 Jun 01.
DOI: 10.1016/j.rvsc.2021.05.020
Abstrakt: Methotrexate (MTX), an antifolate drug, is widely used in chemotherapeutic protocols for metastatic and primary brain tumors and some autoimmune diseases. Its efficacy for brain tumors is limited by the high incidence of central nervous system (CNS) complications. This investigation aimed to observe the morphological effects, including astroglial and microglial responses, following systemic short-term MTX administration in adult rats. Male Wistar rats received 5 or 10 mg/kg/day of MTX by intraperitoneal route for 4 consecutive days (respectively, MTX5 and MTX10 groups) or the same volume of 0.9% saline solution (control group). On the 5th day, brain samples were collected for hematoxylin-eosin and luxol fast blue staining techniques, as well as for immunohistochemical staining for glial fibrillary acidic protein (GFAP) expression in astrocytes and Iba1 (ionized calcium binding adaptor molecule 1) for microglia in the frontal cortex, hippocampus, hypothalamus and molecular/granular layers of the cerebellum. Morphometric analyses were performed using Image Pro-Plus software. Brain levels of the proinflammatory cytokines TNF-α and IL-1β were determined by ELISA. No signs of neuronal loss or demyelination were observed in all groups. Increased GFAP and Iba1 expression was found in all areas from the MTX groups, although it was slightly higher in the MTX10 group compared to the MTX5. Both TNF-α and IL-1β levels were decreased in the MTX5 group compared to controls. In the MTX10 group, TNF-α decreased, although IL-1β was increased relative to controls. MTX administration induced microglial reaction and astrogliosis in several CNS areas. In the MTX5 group, it apparently occurred in the presence of decreased proinflammatory cytokines.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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