Homografts of skin exchanged between two strains of rat survive for an average of 8·8 days.
Survival time is increased to 14·1 days by the daily administration (beginning on the day following operation) of 4·0 mg cortisol, but 2 i.u. ACTH (Cortrophin 'Z') daily has no effect (survival time = 9·0 days).
If, however, treatment with ACTH is begun 28 days before operation the homografts survive for 17 days (Cortrophin 'Z') and for 11·4 days (Acthar gel).
The normal processes of wound repair are slowed down in proportion to the influence of treatment on the immunity reaction.
The results conform to the view that prolonged treatment with ACTH alters the ratio of cortisol/corticosterone secreted by the adrenal cortex.
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