A Role for H2S in the microcirculation of newborns: The major metabolite of H2S (thiosulphate) is increased in preterm infants

Dyson, Rebecca M., Palliser, Hannah K., Latter, Joanna L., Chwatko, Grazyna, Glowacki, Rafal, and Wright, Ian M.R. (2014) A Role for H2S in the microcirculation of newborns: The major metabolite of H2S (thiosulphate) is increased in preterm infants. PLoS ONE, 9 (8). e105085.

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Abstract

Excessive vasodilatation during the perinatal period is associated with cardiorespiratory instability in preterm neonates. Little evidence of the mechanisms controlling microvascular tone during circulatory transition exists. We hypothesised that hydrogen sulphide (H2S), an important regulator of microvascular reactivity and central cardiac function in adults and animal models, may contribute to the vasodilatation observed in preterm newborns. Term and preterm neonates (24-43 weeks gestational age) were studied. Peripheral microvascular blood flow was assessed by laser Doppler. Thiosulphate, a urinary metabolite of H2S, was determined by high performance liquid chromatography as a measure of 24 hr total body H2S turnover for the first 3 days of postnatal life. H2S turnover was greatest in very preterm infants and decreased with increasing gestational age (p = 0.0001). H2S turnover was stable across the first 72 hrs of life in older neonates. In very preterm neonates, H2S turnover increased significantly from day 1 to 3 (p = 0.0001); and males had higher H2S turnover than females (p = 0.04). A significant relationship between microvascular blood flow and H2S turnover was observed on day 2 of postnatal life (p = 0.0004). H2S may play a role in maintaining microvascular tone in the perinatal period. Neonates at the greatest risk of microvascular dysfunction characterised by inappropriate peripheral vasodilatation - very preterm male neonates - are also the neonates with highest levels of total body H2S turnover suggesting that overproduction of this gasotransmitter may contribute to microvascular dysfunction in preterms. Potentially, H2S is a target to selectively control microvascular tone in the circulation of newborns. © 2014 Dyson et al.

Item ID: 62815
Item Type: Article (Research - C1)
ISSN: 1932-6203
Copyright Information: © 2014 Dyson et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Funders: National Health and Medical Research Council of Australia (NHMRC)
Projects and Grants: NHMRC (ID#569285)
Date Deposited: 15 Nov 2023 02:16
FoR Codes: 32 BIOMEDICAL AND CLINICAL SCIENCES > 3213 Paediatrics > 321303 Neonatology @ 100%
SEO Codes: 20 HEALTH > 2005 Specific population health (excl. Indigenous health) > 200506 Neonatal and child health @ 100%
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