SciELO - Scientific Electronic Library Online

vol.7 issue4The use of residues of extraction from Brazil nut oil (Bertholletia excelsa) in food products high in proteins, lipids and fibersFall risk assessment and sarcopenia in the elderly with chronic obstructive pulmonary disease treated at a Belém university hospital, Pará State, Brazil author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




  • Have no cited articlesCited by SciELO

Related links

  • Have no similar articlesSimilars in SciELO


Revista Pan-Amazônica de Saúde

On-line version ISSN 2176-6223


MENDES, Fabíola de Carvalho Chaves de Siqueira; FELICIO, André Pinheiro Gurgel; DINIZ, Cristovam Wanderley Picanço  and  SOSTHENES, Marcia Consentino Kronka. Masticatory change, enriched environment, and aging: stereological studies of CA1 in the hippocampus of Swiss albino mice. Rev Pan-Amaz Saude [online]. 2016, vol.7, n.4, pp.31-40. ISSN 2176-6223.


In order to investigate the effects of alteration in masticatory activity on the cell population, the consequences of the mash diet on the amount of astrocytes in CA1 (Ammon's horn 1) of the hippocampus were evaluated. In addition, the impacts of diet and possible changes associated with the enriched environment and neuropathological processes that may appear during aging were considered.


Female Swiss albino mice were divided into temporal windows of 6, 12 and 18 months. These animals were distributed in groups and received pelleted (PF) or mash (MF) feed, being raised in an enriched or standard environment. With the mentioned age reached, encephalic material was processed for immunohistochemistry of glial fibrillary acidic protein. With the aid of an optical fractionator, astrocytes were quantified in CA1, with variations among their layers.


The environmental standard induced laminar changes in different models of all layers, identifying increases and decreases in the number of astrocytes (PF groups, Stratum lacunosum-moleculare; and MF, in all layers). In the enriched environment, significant changes were observed only in the pyramidal layer (between the ages of 6 and 12 months and of 6 to 18 months, with reduction in number of astrocytes).


The differences found depend on diet, age and aging, suggesting that astrocytosis in young adult mice would be related to neuroprotective mechanisms and that masticatory deprivation at that age would influence this action negatively. In addition, astrocytes during aging would be involved in pro-inflammatory processes if associated with a condition in chewing alteration and environmental enrichment would provide neuroprotection to the malefic effects of aging and masticatory deprivation.

Keywords : Mastication; Aging; Astrocytes; Neurodegeneration.

        · abstract in Portuguese | Spanish     · text in Portuguese     · Portuguese ( pdf )