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• W1489772286 endingPage "597" @default.
• W1489772286 startingPage "587" @default.
• W1489772286 abstract "The fetal defence to acute hypoxaemia involves cardiovascular and metabolic responses, which include peripheral vasoconstriction and hyperglycaemia. Both these responses are mediated via neuroendocrine mechanisms, which require the stimulation of the sympathetic nervous system. In the adult, accumulating evidence supports a role for calcitonin gene‐related peptide (CGRP) in the activation of sympathetic outflow. However, the role of CGRP in stimulated cardiovascular and metabolic functions before birth is completely unknown. This study tested the hypothesis that CGRP plays a role in the fetal cardiovascular and metabolic defence responses to acute hypoxaemia by affecting sympathetic outflow. Under anaesthesia, five sheep fetuses at 0.8 of gestation were surgically instrumented with catheters and a femoral arterial Transonic flow‐probe. Five days later, fetuses were subjected to 0.5 h hypoxaemia during either i.v. saline or a selective CGRP antagonist in randomised order. Treatment started 30 min before hypoxaemia and ran continuously until the end of the challenge. Arterial samples were taken for blood gases, metabolic status and hormone analyses. CGRP antagonism did not alter basal arterial blood gas, metabolic, cardiovascular or endocrine status. During hypoxaemia, similar falls in P a,O2 occurred in all fetuses. During saline infusion, hypoxaemia induced hypertension, bradycardia, femoral vasoconstriction, hyperglycaemia and an increase in haemoglobin, catecholamines and neuropeptide Y (NPY). In contrast, CGRP antagonism markedly diminished the femoral vasoconstrictor and glycaemic responses to hypoxaemia, and attenuated the increases in haemoglobin, catecholamines and NPY. Combined, these results strongly support the hypothesis that CGRP plays a role in the fetal cardiovascular and metabolic defence to hypoxaemia by affecting sympathetic outflow." @default.
• W1489772286 created "2016-06-24" @default.
• W1489772286 creator A5027105472 @default.
• W1489772286 creator A5059308868 @default.
• W1489772286 creator A5065050579 @default.
• W1489772286 creator A5085796940 @default.
• W1489772286 date "2005-07-01" @default.
• W1489772286 modified "2023-10-12" @default.
• W1489772286 title "Calcitonin gene-related peptide antagonism attenuates the haemodynamic and glycaemic responses to acute hypoxaemia in the late gestation sheep fetus" @default.
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• W1489772286 doi "https://doi.org/10.1113/jphysiol.2005.085431" @default.
• W1489772286 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1464744" @default.
• W1489772286 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15860534" @default.
• W1489772286 hasPublicationYear "2005" @default.
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