Modeling pulsativity in the hypothalamic-pituitary-adrenal hormonal axis.

ABSTRACT: A new mathematical model for biological rhythms in the hypothalamic-pituitary-adrenal (HPA) axis is proposed. This model takes the form of a system of impulsive time-delay differential equations which include pulsatile release of adrenocorticotropin (ACTH) by the pituitary gland and a time delay for the release of glucocorticoid hormones by the adrenal gland. Numerical simulations demonstrate that the model's response to periodic and circadian inputs from the hypothalamus are consistent with those generated by recent models which do not include a pulsatile pituitary. In contrast the oscillatory phenomena generated by the impulsive delay equation mode occur even if the time delay is zero. The observation that the time delay merely introduces a small phase shift suggesting that the effects o

SUBMITTER: Churilov AN 

PROVIDER: S-EPMC9120490 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature