Abstract
To define the static gain and dynamic characteristics of the adrenal cortical response to its input hormone, ACTH, and the properties of elements that distribute, bind, and dispose of ACTH after it has entered the blood stream, we introduced graded pulses or graded, constant infusions of ACTH intravenously to unanesthetized dogs, previously prepared for the painless collection of adrenal vein blood. Our data demonstrate that the static gain of the cascaded elements under study is higher than previously described by others using anesthetized dogs. Furthermore, we found faster responses (a wider band-width), and a new response pattern, compared to prior work. The new output pattern, following pulse or step inputs, was defined by application of a linear mean-squared estimator designed as a feature extractor. The new output pattern is not predicted by current models of this system. The linear estimator was effective both as a filter and as an interpolator, and with it we were able to identify a cortisol secretory pattern that otherwise would have been lost in noise. The intra-dog variability was as high as the inter-dog variability in the system components under study. Ten physiological conclusions based on the use of the estimator are presented.
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Bergman, R. N., and Urquhart, J. The pilot gland approach to the study of insulin secretory dynamics.Recent Progress in Hormone Research 1971,27, 583.
Cowan, J. S., Davis, A. E., and Layberry, R. A. Constancy and linearity of the metabolic clearance of adrenocorticotropin in dogs.Canadian Journal of Physiology and Pharmacology 1974,52, 8.
Cowan, J. S. Adrenocorticotropin secretion rates following histamine injection in adult and newborn dogs.Canadian Journal of Physiology and Pharmacology 1975,53, 592.
Cramér, H., and Leadbetter, M. R.Stationary and related stochastic processes. New York: Wiley, 1967.
Dallman, M. F., and Yates, F. E. Anatomical and functional mapping of central neural input and feedback pathways of the adrenocortical system.Memoirs of the Society for Endocrinology 1968,17, 39.
Everson, R. A., Smith, P. D., and Dobson, E. L.Kinetics of adrenocorticotropic hormone inactivation ih the dog. Lawrence Radiation Laboratory Report VCRL-18689, 1969.
Girault, M.Processus aléatories. Paris: Dunod, 1965.
Glantz, S. A., Luetscher, J. A., Day, R. P., and Perloff, M. A compartment description for cortisol secretion, distribution, binding and metabolism in man.IEEE Transactions on Biomedical Engineering 1976,BME-22, 36.
Gonzalez-Luque, A., L'Age, M., Dhariwal, A. P. S., and yates, F. E. Stimulation of corticotropin release by corticotropin-releasing factor (CRF) or by vasopressin following intrapituitary infusions in unanesthetized dogs: Inhibition of the responses by dexamethasone.Endocrinology 1970,86, 1134.
Grodsky, G. M. A threshold distribution hypothesis for packet storage of insulin and its mathematical modeling.Journal of Clinical Investigation 1972,51, 2047.
Hancock, J. C., and Wintz, P. A.Signal detection theory. New York: McGraw-Hill, 1966.
L'Age, M., Gonzalez-Luque, A., and Yates, F. E. Adrenal blood flow dependence of cortisol secretion rate in unanesthetized dogs.American Journal of Physiology 1970,219, 281.
Lake, R. B., and Gann, D. S. Dynamic response of the intact canine adrenal to infused ACTH.Annals of Biomedical Engineering 1972,1 56.
Maran, J. W.Adrenal glucocorticoid system function in unanesthetized dogs; responses to intrapituitary or intraventricular microinfusion of angiotensin II. Ph.D. Thesis, Stanford University, 1974.
Martin, M. M., and Martin, A. L. A. Simultaneous fluorometric determination of cortisol and corticosterone in human plasma.Journal of Clinical Endocrinology 1968,28, 137.
Nahi, N. E.,Estimation theory and applications. New York: Wiley, 1969.
Papoulis, A.Probability, random variables and stochastic processes. New York: McGraw-Hill, 1965.
Urquhart, J. Adrenal blood flow and the adrenocortical response to corticotropin.American Journal of Physiology 1965,209, 1162.
Urquhart, J. Dynamics of ACTH in blood.Federation Proceedings (Abstract) 1967,26, 586.
Urquhart, J., Krall, R. L., and Li, C. C. Analysis of the Koritz-Hall hypothesis for the regulation of steriodogenesis by ACTH.Endocrinology 1968,83, 390.
Urquhart, J., and Li, C. C. The dynamics of adrenocortical secretion.American Journal of Physiology 1968,214, 73.
Urquhart, J., and Li, C. C. Dynamic testing and modeling of adrenocortical secretory function.Annals of the New York Academy of Science 1969,156, 756.
Van Trees, H. L.Detection, estimation and modulation theory. New York: Wiley, 1968. Part I.
von Werder, K., Schwarz, M. K., and Scriba, P. C. Serumproteinbindung von ACTH. I. Untersuchungen mit Dextrangelfiltration und3H-ACTH.Klinische Wochenschrift 1968,46, 940.
von Werder, K., Kluge, F., Schwarz, K., and Scriba, P. C. Serumproteinbindung von ACTH. II. Untersuchungen mit Dichtegradientenzentrifugation und3H-ACTH.Klinische Wochenschrift 1968,46, 1028.
Weber, C. R.Elements of detection and signal design. New York: McGraw-Hill, 1968.
Yates, F. E., and Maran, J. W. Stimulation and inhibition of adrenocorticotropin (ACTH) release. InHandbook of physiology. Baltimore: American Physiological Society, 1974a. Section 7, Volume IV, Part 2, pp. 367–404.
Yates, F. E., and Maran, J. W. The physiology of the mammalian hypothalamoadenohypophysial-adrenal glucocorticoid system—a new hypothesis.Chronobiologia 1974b,1 (suppl. 1), 195.
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Supported by USPHS Grant AM 17679.
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Miller, R.E., Maran, J.W., Meier, G.D. et al. Static gain and dynamics of cortisol secretory response to intravenous corticotropin (ACTH) in unanesthetized dogs analysis by a linear mean-squared estimator. Ann Biomed Eng 4, 364–409 (1976). https://doi.org/10.1007/BF02584526
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DOI: https://doi.org/10.1007/BF02584526