Blood-derived phagocytes in the cerebellar cortex of the rat after chronic alcohol consumption

Past work showed that chronic alcohol consumption induces massive degeneration in the rat cerebellar cortex. To study the subsequent process of nervous tissue repair, followed itself by a remodelling activity, groups of alcohol-treated rats for 3 and 6 months were used and the results compared with the respective age-matched controls. From the wide variety of cells which display phagocytic activity in the mammalian brain it was found, based on qualitative observations, that two types were clearly involved in the removal of the alcohol-induced degenerated debris: the resident microglial cells and the non-resident brain macrophages. This assumption was corroborated by the study of their origin, using carbon particles and latex beeds intravenously injected, which showed that brain macrophages were the sole population to be labelled. These observations fit with the multiple origin concept for neural phagocytosis which postulates that different cell types can be recruited for the removal of the damaged neural tissue depending on the severity of the lesions and on the extension of the blood vessels damage.