atrial-natriuretic-factor and Spinal-Cord-Diseases

atrial-natriuretic-factor has been researched along with Spinal-Cord-Diseases* in 2 studies

Other Studies

2 other study(ies) available for atrial-natriuretic-factor and Spinal-Cord-Diseases

ArticleYear
Atrial natriuretic peptide reduces ischemia/reperfusion-induced spinal cord injury in rats by enhancing sensory neuron activation.
    The Journal of pharmacology and experimental therapeutics, 2007, Volume: 322, Issue:2

    We recently demonstrated that calcitonin gene-related peptide (CGRP) released from sensory neurons reduces spinal cord injury (SCI) by inhibiting neutrophil activation through an increase in the endothelial production of prostacyclin (PGI(2)). Carperitide, a synthetic alpha-human atrial natriuretic peptide (ANP), reduces ischemia/reperfusion (I/R)-induced tissue injury. However, its precise therapeutic mechanism(s) remains to be elucidated. In the present study, we examined whether ANP reduces I/R-induced spinal cord injury by enhancing sensory neuron activation using rats. ANP increased CGRP release and cellular cAMP levels in dorsal root ganglion neurons isolated from rats in vitro. The increase in CGRP release induced by ANP was reversed by pretreatment with capsazepine, an inhibitor of vanilloid receptor-1 activation, or with (9S, 10S, 12R)-2,3,9,10,11,12-hexahydro-10-hydroxy-9-methyl-1-oxo-9,12-epoxy-1H-diindolo[1,2,3-fg:3',2',1'-kl]pyrrolo[3,4-i][1,6]-benzodiazocine-10-carboxylic acid hexyl ester (KT5720), an inhibitor of protein kinase A (PKA), suggesting that ANP might increase CGRP release from sensory neurons by activating PKA through an increase in the cellular cAMP level. Spinal cord ischemia was induced in rats using a balloon catheter placed in the aorta. ANP reduced mortality and motor disturbances by inhibiting reduction of the number of motor neurons in animals subjected to SCI. ANP significantly enhanced I/R-induced increases in spinal cord tissue levels of CGRP and 6-keto-prostaglandin F(1alpha). a stable metabolite of PGI(2). ANP inhibited I/R-induced increases in spinal cord tissue levels of tumor necrosis factor and myeloperoxidase. Pretreatment with 4'-chloro-3-methoxycinnamanilide (SB366791), a specific vanilloid receptor-1 antagonist, and indomethacin reversed the effects of ANP. These results strongly suggest that ANP might reduce I/R-induced SCI in rats by inhibiting neutrophil activation through enhancement of sensory neuron activation.

    Topics: 6-Ketoprostaglandin F1 alpha; Anilides; Animals; Atrial Natriuretic Factor; Calcitonin Gene-Related Peptide; Capsaicin; Carbazoles; Cells, Cultured; Cinnamates; Cyclic AMP; Dose-Response Relationship, Drug; Enzyme Inhibitors; Humans; Indoles; Indomethacin; Male; Neurons, Afferent; Peroxidase; Psychomotor Performance; Pyrroles; Rats; Rats, Sprague-Dawley; Reperfusion Injury; Spinal Cord; Spinal Cord Diseases; TRPV Cation Channels; Tumor Necrosis Factor-alpha

2007
The determination of vasoactive substances during autonomic dysreflexia.
    Spinal cord, 1997, Volume: 35, Issue:6

    Urinary bladder percussion induced autonomic dysreflexia (AD) was observed in spinal cord injured patients with a complete neurological lesion, the upper level being above T5. To document the pathology and study the etiology of autonomic dysreflexia to further investigate its mechanism, this paper presents some clinical data on the determination of vasoactive substances such as norepinephrine (NE), epinephrine (E), renin (R), angiotensin II (AII) and atrial natriuretic polypeptide (ANP) before and during bladder percussion in 30 patients with a thoracolumbar or cervical spine and spinal cord injury. It is demonstrated that tapping the urinary bladder of such patients can cause AD. Changes of some of the vasoactive substances in the plasma were also observed, which might indicate that autonomic dysreflexia result from excitation of the sympathetic nervous system. Overactivity of the sympathetic nervous system was antagonized by excitation of the vegetative nerve system. There was no correlation between changes of blood pressure and adrenal function as well as the change of R-A II system; during autonomic dysreflexia, the inclement of ANP secretion played an important role in recovering homeostasis.

    Topics: Adult; Angiotensin II; Atrial Natriuretic Factor; Blood Pressure; Epinephrine; Female; Humans; Male; Norepinephrine; Paraplegia; Pulse; Quadriplegia; Renin; Spinal Cord Diseases; Sympathetic Nervous System

1997