Hyperoxia blunts counterregulation in humans and differential control of the sympathetic nervous system

This review examines how the sympathetic nervous system plays a major role in the regulation of cardiovascular function over multiple time scales. This is achieved through differential regulation of sympathetic outflow to a variety of organs. This differential control is a product of the topographical organization of the central nervous system and a myriad of afferent inputs. Together this organization produces sympathetic responses tailored to match stimuli. The long-term control of sympathetic nerve activity (SNA) is an area of considerable interest and involves a variety of mediators acting in a quite distinct fashion. These mediators include arterial baroreflexes, angiotensin II, blood volume and osmolarity, and a host of humoral factors. A key feature of many cardiovascular diseases is increased SNA. However, rather than there being a generalized increase in SNA, it is organ specific, in particular to the heart and kidneys. These increases in regional SNA are associated with increased mortality. Understanding the regulation of organ-specific SNA is likely to offer new targets for drug therapy. There is a need for the research community to develop better animal models and technologies that reflect the disease progression seen in humans. A particular focus is required on models in which SNA is chronically elevated.

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BETA-ADRENERGIC BLOCKADE OF THE SYMPATHETIC NERVOUS SYSTEM DECELERATES PERIPORTAL FIBROSIS IN ABCB4 KNOCKOUT MICE

Zeitschrift für Gastroenterologie ◽

10.1055/s-2008-1037489 ◽

2008 ◽

Vol 46 (01) ◽

Author(s):

I Strack ◽

M Scheffler ◽

E Konze ◽

K Wendland ◽

H Varnholt ◽

...

Keyword(s):

Nervous System ◽

Sympathetic Nervous System ◽

Knockout Mice ◽

Adrenergic Blockade ◽

Beta Adrenergic ◽

Periportal Fibrosis ◽

Sympathetic Nervous

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Thyroid hormone-catecholamine interrelationships during exposure to cold

Acta Endocrinologica ◽

10.1530/acta.0.0970091 ◽

1981 ◽

Vol 97 (1) ◽

pp. 91-97 ◽

Cited By ~ 21

Author(s):

H. Storm ◽

C. van Hardeveld ◽

A. A. H. Kassenaar

Keyword(s):

Nervous System ◽

Plasma Concentration ◽

Thyroid Hormone ◽

Sympathetic Nervous System ◽

Plasma Levels ◽

Surgical Procedure ◽

Exposure To Cold ◽

Basal Plasma ◽

Sympathetic Nervous

Abstract. Basal plasma levels for adrenalin (A), noradrenalin (NA), l-triiodothyronine (T3), and l-thyroxine (T4) were determined in rats with a chronically inserted catheter. The experiments described in this report were started 3 days after the surgical procedure when T3 and T4 levels had returned to normal. Basal levels for the catecholamines were reached already 4 h after the operation. The T3/T4 ratio in plasma was significantly increased after 3, 7, and 14 days in rats kept at 4°C and the same holds for the iodide in the 24-h urine after 7 and 14 days at 4°C. The venous NA plasma concentration was increased 6- to 12-fold during the same period of exposure to cold, whereas the A concentration remained at the basal level. During infusion of NA at 23°C the T3/T4 ratio in plasma was significantly increased after 7 days compared to pair-fed controls, and the same holds for the iodide excretion in the 24-h urine. This paper presents further evidence for a role of the sympathetic nervous system on T4 metabolism in rats at resting conditions.

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