Comprehensive Physiology Wiley Online Library

Endocrine Adaptation to Hypoxia

Full Article on Wiley Online Library



Abstract

The sections in this article are:

1 Hypothalamic‐Pituitary‐Adrenal Axis and Endorphins
1.1 Acute Hypoxia
1.2 Mechanisms
1.3 Chronic Hypoxia
1.4 Endorphins/Lipotropic Pituitary Hormone
2 Catecholamines
2.1 Acute Hypoxia
2.2 Mechanisms
2.3 Chronic Hypoxia
3 Atrial Natriuretic Peptide
3.1 Mechanism
3.2 Chronic Hypoxia
4 Arginine Vasopressin
4.1 Acute Hypoxia
4.2 Mechanisms
4.3 Interactions
4.4 Chronic Hypoxia
5 Renin‐Angiotensin‐Aldosterone System
5.1 Acute Hypoxia
5.2 Chronic Hypoxia
5.3 Mechanisms
6 Hypothalamic‐Pituitary‐Thyroid Axis
6.1 Rats
7 Hormones of Reproduction
8 Hormones of the Islets of Langerhans
9 Somatomammotropins
9.1 Prolactin
9.2 Growth Hormone
10 Other Circulating Hormones and Factors
Figure 1. Figure 1.

Plasma aldosterone and cortisol concentrations during bolus infusion of ACTH (dose at top in μg) in progressively increasing doses in subjects exposed to normoxemia (sea level) and acute hypoxemia at sea level (Hypoxemia sea I) and in moderately high altitude (high altitude)‐adapted subjects. Plasma renin activity was decreased in the sea‐level group compared to the other two groups (data not shown). *P < 0.05 between subjects at sea level during normoxemia and hypoxemia and between high‐altitude subjects. **P < 0.05 between subjects at sea level during hypoxemia and between high‐altitude subjects. Graph demonstrates that acute and chronic hypoxia decrease aldosterone but not cortisol response to physiological doses of ACTH.

From ref. 186 with permission
Figure 2. Figure 2.

Effect of buffer PO2 (shown in torr) on angiotensin II—stimulated aldosterone and cortisol release from acutely dispersed bovine adrenal zona glomerulosa and fasciculata cells. Aldosterone release was proportional to PO2, whereas cortisol release was unaffected by changing PO2.

Adapted from ref. 172 with permission
Figure 3. Figure 3.

Plasma aldosterone and atrial natriuretic factor (ANF) levels during acute hypoxia (closed circles; SaO2 ∼68 ± 1%) and normoxia (open circles). *P < 0.05, **P < 0.01 compared with control. †P < 0.05, hypoxemia vs. normoxemia. Graph indicates that aldosterone decreases while ANF increases, suggesting that ANF may be a cause of the decreased aldosteronogenesis shown in Figure 1.

From ref. 118 with permission
Figure 4. Figure 4.

Serum osmolality (solid line) and plasma arginine vasopressin concentrations (dashed line) at sea level, 5,400 m, and 6,300 m for 7‐17 days (n = 13). Graph demonstrates no change in vasopressin despite a significant increase in osmolality.

From ref. 24 with permission


Figure 1.

Plasma aldosterone and cortisol concentrations during bolus infusion of ACTH (dose at top in μg) in progressively increasing doses in subjects exposed to normoxemia (sea level) and acute hypoxemia at sea level (Hypoxemia sea I) and in moderately high altitude (high altitude)‐adapted subjects. Plasma renin activity was decreased in the sea‐level group compared to the other two groups (data not shown). *P < 0.05 between subjects at sea level during normoxemia and hypoxemia and between high‐altitude subjects. **P < 0.05 between subjects at sea level during hypoxemia and between high‐altitude subjects. Graph demonstrates that acute and chronic hypoxia decrease aldosterone but not cortisol response to physiological doses of ACTH.

From ref. 186 with permission


Figure 2.

Effect of buffer PO2 (shown in torr) on angiotensin II—stimulated aldosterone and cortisol release from acutely dispersed bovine adrenal zona glomerulosa and fasciculata cells. Aldosterone release was proportional to PO2, whereas cortisol release was unaffected by changing PO2.

Adapted from ref. 172 with permission


Figure 3.

Plasma aldosterone and atrial natriuretic factor (ANF) levels during acute hypoxia (closed circles; SaO2 ∼68 ± 1%) and normoxia (open circles). *P < 0.05, **P < 0.01 compared with control. †P < 0.05, hypoxemia vs. normoxemia. Graph indicates that aldosterone decreases while ANF increases, suggesting that ANF may be a cause of the decreased aldosteronogenesis shown in Figure 1.

From ref. 118 with permission


Figure 4.

Serum osmolality (solid line) and plasma arginine vasopressin concentrations (dashed line) at sea level, 5,400 m, and 6,300 m for 7‐17 days (n = 13). Graph demonstrates no change in vasopressin despite a significant increase in osmolality.

From ref. 24 with permission
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Hershel Raff. Endocrine Adaptation to Hypoxia. Compr Physiol 2011, Supplement 14: Handbook of Physiology, Environmental Physiology: 1259-1275. First published in print 1996. doi: 10.1002/cphy.cp040254