ABSTRACT
Morphologically and functionally distincts from each other, the two different types of endocrine tissue that constitute the adrenal gland, the medulla and the cortex, could have influence on the endocrine activity of each one, i.e., there might be regulatory mechanisms exercised by some products released from each of these two areas to the other one. Besides these findings, there are evidences of the presence of cells from the adrenal cortex within the medulla area and vice versa. Twenty-one cases without clinical evidence of endocrine disease were selected for morphological study of the adrenal tissue and to verify their immunoreactivity for hormones, intermediate filaments and neuroendocrine peptides. All cases were histologically classified as normal. Chromogranin was recognized in 20 cases only in medullary region. Synaptophysin was identified in the medullary area in 9 cases. S-100 protein was observed in all cases in both medullary and cortex areas. Immunoreactivity to cytokeratins was found in 14 cases. Vimentin showed focal positivity in 5 normal cortex areas and ACTH reactivity was present in only one case. Positivity for FSH was observed (one case in medulla and two in cortex), possibly due to antibody specificty. D-11 positivity was found in the cortex region in 18 cases. Further studies should be conducted in order to establish the utility of these findings, since presence of hormone or hormone-like sustance secreting cells could induce local paracrine stimulation.