Maternal smoking in pregnancy alters neonatal cytokine responses

Allergy. 2003 Oct;58(10):1053-8. doi: 10.1034/j.1398-9995.2003.00290.x.


Background: Maternal cigarette smoking in pregnancy is an important, common and avoidable exposure that has been linked with elevated cord blood (CB) immunoglobulin E levels and subsequent asthma and allergic disease in childhood. Despite this, there is still very little information about the immunological effects of maternal smoking on the fetus.

Methods: This aim of this study was to compare cord blood mononuclear cell (CBMC) cytokine responses to allergens [ovalbumin (OVA) or house dust mite (HDM)] and mitogens [concanavalin A (ConA) or phytohemaglutinen (PHA)] in neonates whose mothers smoked throughout pregnancy (n = 17) with responses of neonates whose mothers never smoked (n = 40). Cell cultures were stimulated for 24 h and supernatants collected for cytokine detection by enzyme-linked immunosorbent assay [interleukin (IL)-13, IL-6, interferon (IFN)gamma and IL-10]. Cell pellets were also collected for cytokine mRNA detection (IL-5, IL-9, IFNgamma).

Results: Maternal smoking in pregnancy was associated with significantly higher neonatal T helper type 2 (IL-13 protein) responses to both HDM (P = 0.01) and OVA (P = 0.035). These effects remained statistically significant after allowing for confounding factors, including the effects of maternal atopy. Similar trends were also seen for IL-9mRNA, IL-5mRNA and IL-6 responses, although these were not statistically significant. Although IFNgamma mRNA responses to PHA (P = 0.015) and ConA (P = 0.025) were lower if mothers smoked in pregnancy, there were no differences in neonatal (Th1) IFNgamma protein responses to allergens or mitogens.

Conclusions: These findings indicate that maternal cigarette smoking can modify aspects of fetal immune function and highlight the need for further studies in this area.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Cytokines / biosynthesis*
  • Female
  • Humans
  • Infant
  • Interleukin-10 / biosynthesis
  • Interleukin-6 / biosynthesis
  • Maternal Exposure*
  • Ovalbumin / immunology
  • Pregnancy
  • Prospective Studies
  • Pyroglyphidae / immunology
  • Smoking*


  • Cytokines
  • Interleukin-6
  • Interleukin-10
  • Ovalbumin