In vitro examination of degenerative evolution of adrenergic nerve endings in pulmonary inflamatory processes in newborns

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Abstract

Morphological aspect of tracheal preparations and pulmonary tissue was studied in vitro. The material was obtained from autopsy of newborns that died from different causes. Examinations were made in different gestational periods (immature 23-29 weeks; premature 30-37 weeks; mature >38 weeks). Materialfor examination was obtained up to 6 hours after death. Pulmonary and tracheal tissue was incubated for fi xation in buff ered formalin (10%). Special histochemical and histoenzymatic methods were used for coloring of pulmonary and tracheal tissue and the activity of ATP-ase and dopaoxidase was monitored. Cut out models were made in series of 7μ, 10μ and 20μ In peripheral axons of tracheobronchial pathways, degenerative alterations of adrenergic nerve endings in lung infl ammatory processes were documented. These morphologic neuronal changes were described: Walerians degeneration, neuro-axonal degeneration and segment demyelinisation. These changes are well seen with argentafi ne coloring (Sevier-Munger modifi cation for nerve endings) and with dopaoxidase reaction. In mature newborns that died from respiratory distress syndrome, we found different forms of metabolic and toxic degenerative damage in peripheral axons, such as: segment demyelinisation, neurotubular fragmentation, Schwan cell proliferation, fragmentation and bulging out of axonal neurotubules and neurofi laments. In tracheo-bronchial tissue, chromafi ne granules are homogenously distributed on Lamina propria layer and through glandular structures. This gives as a contradiction, according to some authors, that adrenergic nerve fi bers for muscle tissue are absent and that adrenaline and noradrenalin diff use in muscle tissue from interstice.

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Islami, H., Shabani, R., Haliti, N., Bexheti, S., Koliqi, R., Raka, D., … Qehaja, N. (2008). In vitro examination of degenerative evolution of adrenergic nerve endings in pulmonary inflamatory processes in newborns. Bosnian Journal of Basic Medical Sciences, 8(3), 220–225. https://doi.org/10.17305/bjbms.2008.2921

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