TY - JOUR
T1 - Hypercoagulability in adolescent girls on oral contraceptives-global coagulation profile and estrogen receptor polymorphisms
AU - Zia, Ayesha
AU - Callaghan, Michael U.
AU - Callaghan, Joseph H.
AU - Sawni, Anju
AU - Bartlett, Heather
AU - Backos, Alcesa
AU - Marshall, Sharon
AU - Chitlur, Meera
AU - Rajpurkar, Madhvi
PY - 2015/8/1
Y1 - 2015/8/1
N2 - Oral contraceptive (OCP) induced changes on coagulation are complex with high inter-individual variability. The precise reason for differences in this variability is unknown. We hypothesized that global coagulation assays better delineate these changes and variability in hypercoagulability may be the result of differences in estrogen metabolism and thrombophilia. Fifty-two adolescents initiating OCPs were prospectively enrolled; 33 subjects completed the study. Samples were analyzed prior to and after OCPs for procoagulant and anticoagulant factor activities and thrombin generation (TG) +/-thrombomodulin. Participants were genotyped for common thrombophilia and estrogen receptor-α (ESR-α) single nucleotide polymorphisms (SNPs). SNP genotypes were compared to coagulation parameters; TG parameters and differences pre and post OCPs were examined. At baseline, a striking finding was elevated FVIII levels. FVL was absent in all and F2 G20210A was present in one participant. The ESR-α polymorphism was present in heterozygous state in 59% and homozygous state in 21% participants. There were no differences in VWF levels and FVIII: C after being on OCPs. Protein S levels decreased with OCPs. Sixty percent of participants showed evidence of hypercoagulability on TG testing on OCPs. Higher thrombin peak and endogenous thrombin potential (ETP) were seen on TG after OCPs. With thrombomodulin, ETP and thrombin peak did not decrease after OCPs, signifying 'thrombomodulin resistance'. We demonstrated that OCPs induce a state of "variable" hypercoagulability in adolescents, predominantly through the protein S pathway. Genetic and nongenetic factors may account for the variable increase in hypercoagulability. Further research is needed to understand this.
AB - Oral contraceptive (OCP) induced changes on coagulation are complex with high inter-individual variability. The precise reason for differences in this variability is unknown. We hypothesized that global coagulation assays better delineate these changes and variability in hypercoagulability may be the result of differences in estrogen metabolism and thrombophilia. Fifty-two adolescents initiating OCPs were prospectively enrolled; 33 subjects completed the study. Samples were analyzed prior to and after OCPs for procoagulant and anticoagulant factor activities and thrombin generation (TG) +/-thrombomodulin. Participants were genotyped for common thrombophilia and estrogen receptor-α (ESR-α) single nucleotide polymorphisms (SNPs). SNP genotypes were compared to coagulation parameters; TG parameters and differences pre and post OCPs were examined. At baseline, a striking finding was elevated FVIII levels. FVL was absent in all and F2 G20210A was present in one participant. The ESR-α polymorphism was present in heterozygous state in 59% and homozygous state in 21% participants. There were no differences in VWF levels and FVIII: C after being on OCPs. Protein S levels decreased with OCPs. Sixty percent of participants showed evidence of hypercoagulability on TG testing on OCPs. Higher thrombin peak and endogenous thrombin potential (ETP) were seen on TG after OCPs. With thrombomodulin, ETP and thrombin peak did not decrease after OCPs, signifying 'thrombomodulin resistance'. We demonstrated that OCPs induce a state of "variable" hypercoagulability in adolescents, predominantly through the protein S pathway. Genetic and nongenetic factors may account for the variable increase in hypercoagulability. Further research is needed to understand this.
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U2 - 10.1002/ajh.24064
DO - 10.1002/ajh.24064
M3 - Article
C2 - 26014094
AN - SCOPUS:84937459817
VL - 90
SP - 725
EP - 731
JO - American Journal of Hematology
JF - American Journal of Hematology
SN - 0361-8609
IS - 8
ER -