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Interleukin-10 in amniotic fluid at midtrimester: immune activation and suppression in relation to fetal growth
K D Heyborne1, J A McGregor, G Henry
1Department of Obstetrics and Gynecology, University of Colorado Health Sciences Center, Denver 80262.
Insights
Elevated interleukin-10, an immunosuppressive cytokine, in amniotic fluid is linked to impaired fetal growth. This finding suggests abnormal immune activation, not suppression, contributes to low birth weight complications.
Area of Science:
- Reproductive Immunology
- Maternal-Fetal Medicine
- Cytokine Signaling
Background:
- Low birth weight is a major cause of perinatal complications.
- Mechanisms of impaired fetal growth are not fully understood.
- The role of immune factors in fetal growth requires further investigation.
Purpose of the Study:
- To investigate the role of interleukin-10 (IL-10) in impaired fetal growth.
- To determine if IL-10 levels in amniotic fluid are associated with small-for-gestational age (SGA) pregnancies.
- To explore the relationship between IL-10 and immune modulation during pregnancy.
Main Methods:
- A case-control study design was employed.
- Amniotic fluid samples were collected during midtrimester genetic amniocentesis.
- Interleukin-10 levels were quantified using an enzyme-linked immunoassay.
Main Results:
- Elevated amniotic fluid levels of interleukin-10 were observed in small-for-gestational age pregnancies (median 78 pg/ml) compared to appropriate-for-gestational age controls (median < 40 pg/ml) (p=0.02).
- In small-for-gestational age pregnancies, higher IL-10 levels were significantly associated with nulliparity (p=0.003).
Conclusions:
- The findings support a role for abnormal immune activation in mediating impaired fetal growth.
- The results suggest that increased immune activity, rather than insufficient immune suppression, is implicated in fetal growth restriction.
- Interleukin-10 may serve as a biomarker for immune dysregulation affecting fetal development.
Objective:
Low birth weight remains the leading cause of perinatal morbidity and mortality, but mechanisms mediating impaired fetal growth are poorly understood. To further define the role of abnormal immune activation and suppression in mediating impaired fetal growth, we measured levels of interleukin-10, a potent immunosuppressive cytokine not previously identified in association with pregnancy, in amniotic fluid samples obtained at genetic amniocentesis.
Study Design:
In a case-control study with an enzyme-linked immunoassay we compared amniotic fluid levels of interleukin-10 in midtrimester samples obtained from appropriate-for-gestational age (n = 42) and small-for-gestational-age (n = 24) pregnancies.
Results:
Interleukin-10 levels in small-for-gestational-age samples were elevated (median 78 pg/ml) compared with levels in control samples (median < 40 pg/ml), p = 0.02. In small-for-gestational-age pregnancies elevated levels were associated with nulliparity, p = 0.003.
Conclusion:
Our data support the role of abnormal immune activation, as opposed to inadequate immune suppression, in mediating impaired fetal growth.