Summary
Immunohistochemical studies for methionine- and leucine-enkephalin were performed on 26 phaeochromocytomas to elucidate the patho-physiological roles of enkephalins. Positive reactions were seen in all phaeochromocytomas with varying intensities. The location of methionine- and leucine-enkephalin agreed fairly well with each other. Stronger immunostaining was obtained in phaeochromocytomas secreting both adrenalin and noradrenalin than in those secreting predominantly noradrenalin. Paroxysmal hypertension was frequently observed in patients with adrenalin-secreting phaeochromocytomas, especially those with marked enkephalin positivity. Urinary excretion of metanephrine was significantly correlated with enkephalin positivity. These findings show that all phaeochromocytomas retain the ability to produce enkephalins of the adreno-medullary or extra-medullary chromaffin tissues from which they derive. Augmented enkephalin-immunoreactivity in adrenalin-producing phaeochromocytomas may be interpreted as reflecting a close association of enkephalins with adrenalin under physiological conditions.
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This work is supported in part by a Grant-in-Aid from the Ministry of Education, Science and Culture (No. 61770949).
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Kodama, T., Ito, C., Fujimoto, Y. et al. Augmented enkephalin-immunoreactivity in adrenaline-producing phaeochromocytomas. Vichows Archiv A Pathol Anat 416, 417–422 (1990). https://doi.org/10.1007/BF01605147
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DOI: https://doi.org/10.1007/BF01605147