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Intrauterine growth retardation of unknown etiology. I. Serum complement and circulating immune complexes in mothers
Insights
This study investigated immune factors in pregnancies with small-for-gestational-age (SGA) infants. Lower complement levels and the presence of immune complexes suggest an immunological basis for placental issues in SGA pregnancies.
Area of Science:
- Immunology
- Perinatology
- Obstetrics
Background:
- Idiopathic intrauterine growth retardation (IUGR) is a significant concern in obstetrics.
- The potential immunological etiology of placental lesions in IUGR remains incompletely understood.
Purpose of the Study:
- To investigate complement (C) and circulating immune complexes (CIC) in mothers of small-for-gestational-age (SGA) infants.
- To identify potential immunological mechanisms underlying placental pathology in idiopathic IUGR.
Main Methods:
- Measurement of C and CIC levels in 22 mothers of SGA infants and 15 SGA infants.
- Comparison with a control group of 19 normal pregnant women and 18 infants.
- Histopathological examination of placentas for lesions and immune deposits (IgM, C3).
Main Results:
- Significantly lower C levels were observed in mothers of SGA infants compared to controls (p < 0.01).
- CIC were detected in the sera of mothers and infants in the SGA group, but not in controls.
- Placental lesions were more prevalent in the SGA group (64%) versus controls (9%), with evidence of acute atherosclerosis and immune deposits in SGA placentas.
Conclusions:
- The findings support an immunological mechanism contributing to placental lesions in idiopathic intrauterine growth retardation.
- Complement and immune complex dysregulation may play a role in the pathophysiology of SGA.
- Further research into immune-mediated pathways is warranted for understanding and managing SGA pregnancies.
Abstract:
Complement (C) and circulating immune complexes (CIC) levels were measured in 22 full-term pregnant women and 15 of their small-for-gestational-age (SGA) offspring in order to seek evidence supporting an immunological etiology for placental lesions related to idiopathic intrauterine growth retardation. We used 19 normal full-term pregnant women and 18 of their infants with birthweight above the 25th centile of the ponderal curve as a control population for this study. C levels were significantly lower in mothers of SGA infants than in controls (146.6 +/- 46.6 and 183.6 +/- 36.6 respectively, p less than 0.01). CIC were present in the sera of 5 out of 22 mothers of the SGA group and in 3 out of the 15 infants sera. No CIC were found in the sera of mothers or infants from the control group. Placental lesions were observed in 14 out of the 22 (64%) cases studied in the SGA group and in 1 of 11 (9%) of the controls. Two placentas from SGA infants showed acute atherosclerosis, and deposits of IgM and C3 were found in their vessel walls. These data are in favor of an immunological mechanism for intrauterine growth retardation of unknown etiology.