Abstract:
:There is considerable evidence that the central nervous system (CNS) is significantly involved in potassium homeostasis: (a) Potassium-specific receptors located in the liver or hepatic portal circulation initiate a reflex increase in potassium excretion via vagal afferents. This reflex is lost or diminished with hypophysectomy. (b) Oscillators, presumably located in the hypothalamus, determine a circadian rhythm in the renal excretion of potassium. The efferent control factors are unknown. (c) Exogenous hypophysial peptides (vasopressin, oxytocin, and alpha-, beta-, and gamma-MSH) stimulate increased potassium (and sodium) excretion. (d) Hypophysial gamma-MSH or a related hypophysial peptide stimulates an increase in the excretion of potassium (and sodium) following uninephrectomy in the rat. This adaptive response involves cerebral, naloxone-inhibitable opioid receptors. (e) Intra-third-ventricular infusion of hypertonic NaCl initiates an increased potassium (and sodium) excretion through undetermined humoral mechanisms and is blocked by prior hypophysectomy. (f) In rats depleted of potassium by low potassium intake or by production of DOCA hypertension, an inhibition of skeletal muscle Na+, K(+)-ATPase ion pump activity is directed by hypothalamic centers and involves inhibition by alpha-adrenergic activity of slow twitch fibers and inhibition by undetermined humoral factors of fast twitch fibers. (g) Potassium receptors, either demonstrated or inferred, initiate reflex increases in respiration, heart rate, blood pressure, and peripheral tissue potassium uptake as well as a reflex inhibition of skeletal muscle ion pumps. (h) Evidence for CNS regulation of potassium intake is equivocal. Major gaps exist in this emerging picture of neuroendocrine involvement in potassium homeostasis.
journal_name
Front Neuroendocrinoljournal_title
Frontiers in neuroendocrinologyauthors
Rabinowitz L,Aizman RIdoi
10.1006/frne.1993.1001subject
Has Abstractpub_date
1993-01-01 00:00:00pages
1-26issue
1eissn
0091-3022issn
1095-6808pii
S0091-3022(83)71001-0journal_volume
14pub_type
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journal_title:Frontiers in neuroendocrinology
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abstract::A 37-kDa corticotropin releasing factor (CRF) binding protein (CRF-BP) was purified from human plasma by repeated affinity purification and subsequently sequenced and cloned. The human and rat CRF-BP cDNAs encode proteins of 322 amino acids with one putative signal sequence, one N-glycosylation site, and 10 conserved ...
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journal_title:Frontiers in neuroendocrinology
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abstract::Multiple sclerosis (MS) is a disease characterized by inflammation and demyelination. Currently, the cause of MS is unknown. Experimental autoimmune encephalomyelitis (EAE) is the most common mouse model of MS. Treatments with the sex hormones, estrogens and androgens, are capable of offering disease protection during...
journal_title:Frontiers in neuroendocrinology
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journal_title:Frontiers in neuroendocrinology
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journal_title:Frontiers in neuroendocrinology
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journal_title:Frontiers in neuroendocrinology
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