title: The influence of gestation and mechanical ventilation on serum clara cell secretory protein (CC10) concentrations in ventilated and nonventilated newborn infants.
abstract: Clara cell secretory protein (CC10) is an important anti-inflammatory mediator in the adult lung, but its role in newborn pulmonary protection is uncertain. We examined the early postnatal behavior of CC10 in newborn serum and tracheal fluid and hypothesized that CC10 production is positively influenced by gestation. Blood from 165 infants from the first, third/fourth, and seventh days of life (gestational ages: 23-29 wk, 30-36 wk, >36 wk) and tracheal fluid (TF) from the first day of life from 32 ventilated infants were analyzed for CC10. Surfactant proteins A (SPA) and B (SPB) were also analyzed from the blood of a subgroup of infants. Serum CC10 on day 1 was highest in term infants (69.4 ng/mL), followed by moderately preterm (55.8 ng/mL), and then extremely preterm infants (median 42.1 ng/mL). Term infants also had higher tracheal fluid CC10 than preterm infants. (20.152 ng/mL versus 882 ng/mL). Mechanical ventilation increased serum CC10 only in moderately preterm infants, and only on d 1 [68.4 ng/mL versus 42.1 ng/mL (nonventilated moderately preterm infants)]. Serum CC10 decreased progressively by the end of the first week in all infants, in contrast to SPA and SPB, which increased. Our results show that CC10 is detectable in the blood of newborn infants and that a production surge occurs at birth. This surge is more pronounced in term infants and may confer them with superior extrauterine pulmonary protection compared with preterm infants.
authors.affiliation: Department of Newborn Care, Royal Hospital for Women, Randwick, NSW, Australia.
authors.forename: Alison
authors.initials: A
authors.lastname: Loughran-Fowlds
authors.forename: Julee
authors.initials: J
authors.lastname: Oei
authors.forename: He
authors.initials: H
authors.lastname: Wang
authors.forename: Hongxiu
authors.initials: H
authors.lastname: Xu
authors.forename: Neil
authors.initials: N
authors.lastname: Wimalasundera
authors.forename: Claire
authors.initials: C
authors.lastname: Egan
authors.forename: Richard
authors.initials: R
authors.lastname: Henry
authors.forename: Kei
authors.initials: K
authors.lastname: Lui
mesh_terms: D000375:Aging / Q000097:blood / Q000502:physiology; D002657:Child Development / Q000502:physiology; D002908:Chronic Disease; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn / Q000097:blood* / Q000502:physiology; D007234:Infant, Premature / Q000097:blood* / Q000502:physiology; D007668:Kidney / Q000502:physiology; D008168:Lung / Q000502:physiology / Q000503:physiopathology; D008171:Lung Diseases / Q000097:blood / Q000209:etiology / Q000503:physiopathology; D008297:Male; D037662:Pulmonary Surfactant-Associated Protein A / Q000097:blood; D037701:Pulmonary Surfactant-Associated Protein B / Q000097:blood; D012121:Respiration, Artificial; D012127:Respiratory Distress Syndrome, Newborn / Q000097:blood / Q000209:etiology / Q000503:physiopathology; D012307:Risk Factors; D014132:Trachea / Q000737:chemistry; D014598:Uteroglobin / Q000032:analysis / Q000097:blood* / Q000172:deficiency / Q000502:physiology
chemical_list: D037662:Pulmonary Surfactant-Associated Protein A; D037701:Pulmonary Surfactant-Associated Protein B; C556389:SCGB1A1 protein, human; D014598:Uteroglobin