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Gesi, M; Fornai, F; Lenzi, P; Natale, G; Soldani, P; Paparelli, A
European journal of morphology, 07/2001, Letnik: 39, Številka: 3Journal Article
In response to a stressful stimulus, there is a marked activation of the hypothalamic-pituitary-adrenal axis leading to a release of adrenocorticotropic hormone. This, in turn, acts on the zona fasciculata of the adrenal cortex to increase corticosterone plasma levels. Given the frequency of chronic intermittent noise exposure in man, we selected loud noise to evaluate concomitant changes in the ultrastructure of the adrenal cortex and corticosterone release. Following chronic (21 days, 6 h per day) loud white noise exposure (100 dBA, 0-26 KHz), we found the zona fasciculata to be most sensitive to time-dependent ultrastructural changes. These consisted of modifications in cell compartments involved in hormone synthesis and release. On the other hand, we found a progressive increase in corticosterone plasma levels which reached a plateau 9 days after noise exposure. The significance of these changes, in relation to phenomena like sensitization to repetitive stress, are discussed. Furthermore, the present data suggest that chronic loud noise exposure might potentially lead to endocrine dysfunctions.
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