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Cystatin C, beta-2-microglobulin and beta-trace protein in pre-eclampsia
K Kristensen1, D Wide-Swensson, C Schmidt
1Department of Obstetrics and Gynaecology, University Hospital, Lund, Sweden. karl.kristensen@gyn.lu.se
Acta Obstetricia Et Gynecologica Scandinavica
|July 27, 2007
Summary
Maternal plasma levels of beta-2 microglobulin, beta-trace protein, and cystatin C are elevated in pre-eclampsia. These low molecular mass proteins show promise as diagnostic markers for renal impairment in pre-eclampsia.
Area of Science:
- Nephrology
- Obstetrics
- Biochemistry
Background:
- Altered renal function is central to pre-eclampsia pathophysiology.
- Plasma levels of low molecular mass proteins (beta-trace protein, beta-2 microglobulin, cystatin C) increase in normal pregnancy.
- These proteins are further elevated in pre-eclampsia, with cystatin C noted as a reliable marker.
Purpose of the Study:
- To investigate plasma levels of beta-trace protein, beta-2 microglobulin, and cystatin C in pre-eclampsia.
- To evaluate the diagnostic performance of these proteins compared to urate and creatinine for pre-eclampsia detection.
Main Methods:
- A case-control study involving 57 pre-eclamptic women and 218 healthy pregnant women in their third trimester.
- Blood samples collected during an 18-month period (October 2003 - April 2005) in Lund, Sweden.
- Plasma concentrations of the three proteins analyzed using automated particle-enhanced immunoturbidimetric assays.
Main Results:
- Significantly higher plasma levels of beta-2 microglobulin, beta-trace protein, and cystatin C were observed in pre-eclamptic patients compared to healthy controls.
- Upper reference limits established: beta-2 microglobulin (2.57 mg/l), beta-trace protein (0.72 mg/l), cystatin C (1.37 mg/l).
- ROC analysis indicated similar diagnostic performance for the three proteins, with beta-trace protein showing the best performance.
Conclusions:
- Maternal plasma levels of beta-2 microglobulin, beta-trace protein, and cystatin C are significantly elevated in pre-eclampsia.
- These low molecular mass proteins demonstrate comparable diagnostic utility for pre-eclampsia.
- The findings suggest these proteins are valuable markers for assessing renal impairment in pre-eclampsia.
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