J Korean Med Sci.  2008 Aug;23(4):609-615. 10.3346/jkms.2008.23.4.609.

Decreased Expression of Transforming Growth Factor-beta1 in Bronchoalveolar Lavage Cells of Preterm Infants with Maternal Chorioamnionitis

• Choi CW
• Kim BI
• Joung KE
• Lee JA
• Lee YK
• Kim EK
• Kim HS
• Park JD
• Choi JH

• KMID: 1785818
• DOI: http://doi.org/10.3346/jkms.2008.23.4.609

Abstract

Maternal chorioamnionitis has been associated with abnormal lung development. We examined the effect of maternal chorioamnionitis on the expression of transforming growth factor-beta1 (TGF-beta1) in the lungs of preterm infants. A total of 63 preterm (< or =34 weeks) infants who were intubated in the delivery room were prospectively enrolled. Their placentas were examined for the presence of chorioamnionitis. Bronchoalveolar lavage (BAL) fluid and cells were obtained shortly after birth. TGF-beta1 was measured in BAL fluid and TGF-beta1 mRNA expression was determined by reverse transcription polymerase chain reaction (RT-PCR) in BAL cells. TGF-beta1 mRNA expression in BAL cells showed a positive correlation with gestational age (r=0.414, p=0.002). TGF-beta1 mRNA expression was significantly decreased in the presence of maternal chorioamnionitis (0.70+/-0.12 vs. 0.81+/-0.15, p=0.007). Adjustment for gestational age, birth weight, and delivery mode did not nullify the significance. TGF-beta1 mRNA expression was marginally significantly decreased in preterm infants who developed bronchopulmonary dysplasia (BPD) later (0.75+/-0.11 vs. 0.82+/-0.15, p=0.055). However, adjustment for gestational age, patent ductus arteriosus (PDA), and maternal chorioamnionitis nullified the significance. These results might be an indirect evidence that maternal chorioamnionitis may inhibit normal lung development of fetus.

Keyword

Transforming Growth Factor-beta; Chorioamnionitis; Bronchopulmonary Dysplasia

MeSH Terms

Birth Weight
Bronchoalveolar Lavage Fluid/*chemistry/cytology
Bronchopulmonary Dysplasia/*etiology
Chorioamnionitis/*metabolism
Female
Humans
Infant, Newborn
Infant, Premature
Male
Pregnancy
RNA, Messenger/analysis
Transforming Growth Factor beta1/*analysis/genetics

Figure

• 

  Fig. 1 The correlations between TGF-β1 mRNA in BAL cells and gestational age (A) and birth weight (B). (A) A significant positive correlation is shown in total population (r=0.414, p=0.002) and in the subgroup without maternal chorioamnionitis (r=0.412, p=0.014), while poor correlation in the subgroup with maternal chorioamnionitis. (B) A significant positive correlation is shown in total population (r=0.372, p=0.005) and in the subgroup without maternal chorioamnionitis (r=0.481, p=0.003), while poor correlation in the subgroup with maternal chorioamnionitis.

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