D I Lynch-Salamon | PubMed Health

PubMed1992

Decrease in annexin I messenger ribonucleic acid expression in human amnion with labor.

OBJECTIVE: Annexins are a superfamily of proteins that are thought to inhibit phospholipase A2 activity and hence inhibit prostaglandin production. The purpose of this study was to test the hypothesis that annexin I concentration in human amnion is reduced with labor and that this reduction is mediated by a decrease in annexin I messenger ribonucleic acid expression. STUDY DESIGN: Amnion and choriodecidua were collected from term singleton pregnancies, eight after spontaneous vaginal delivery and eight from elective cesarean section without labor. Annexin I protein was quantitated by Western blotting. Ribonucleic acid was isolated from amnion, and then annexin I messenger ribonucleic acid was identified by Northern hybridization and quantitated by slot blotting. RESULTS: Annexin I (35 kd) was identified in amnion tissue. The concentration in the group undergoing labor (320 +/- 45 integrated optical density units, mean +/- SE) was significantly reduced (p < 0.05) compared with that in the group not undergoing labor (635 +/- 65 units). The size of the annexin I messenger ribonucleic acid was approximately 1.8 kb. The mean integrated optical density for the labor group (840 +/- 139 units, mean +/- SE) was significantly reduced (p < 0.05) compared with that of the nonlabor group (1912 +/- 464 units). CONCLUSION: There is a significant decrease in annexin I messenger ribonucleic acid expression in human amnion with labor, corresponding to a significant decrease in annexin I protein concentration. This may contribute to the increased phospholipase A2 activity, arachidonic acid mobilization, and prostaglandin production at labor in humans.

Amnion↗

PubMed1992

Hepatitis C in obstetrics and gynecology.

Because of the risk of perinatal transmission and possible sexual transmission, it is important for obstetrician-gynecologists to keep abreast of the rapidly expanding literature on hepatitis C. Acute hepatitis C represents about 5% of all reported cases of hepatitis. Approximately 50% of acute infections progress to chronic liver disease. Risk factors for infection include intravenous (IV) drug use (21-42% of cases), previous blood transfusion (6-17%), and multiple sexual partners (6%); 40-50% of cases have no identified risk factors. The seroprevalence of anti-hepatitis C antibody is 70.8% in IV drug users, 11.6% in patients with human immunodeficiency virus, 8.8% in prostitutes, 1.2% in hospital personnel, and 0.5-1.4% in volunteer blood donors. The risk of transmission to the neonate depends on the trimester at exposure. No perinatal transmission has been shown after acute maternal infection in the second trimester. Based on the few reported cases, chronic maternal infection or acute infection in the third trimester may result in neonatal infection rates of 45-87.5%. Universal screening is probably not cost-effective because the prevalence is low and over 70% of screening tests can be falsely positive using the currently approved assay. Selective screening of high-risk patients is recommended.

Female↗