TY - JOUR
T1 - Young women with polycystic ovary syndrome have raised levels of circulating annexin V-positive platelet microparticles
AU - Willis, G. R.
AU - Connolly, K.
AU - Ladell, K.
AU - Davies, T. S.
AU - Guschina, I. A.
AU - Ramji, D.
AU - Miners, K.
AU - Price, D. A.
AU - Clayton, A.
AU - James, P. E.
AU - Rees, D. A.
N1 - Publisher Copyright:
© The Author 2014. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology.
PY - 2014/10/21
Y1 - 2014/10/21
N2 - STUDY QUESTION Are circulating microparticles (MPs) altered in young women with polycystic ovary syndrome (PCOS)? SUMMARY ANSWER Women with PCOS have elevated concentrations of circulating platelet-derived MPs, which exhibit increased annexin V binding and altered microRNA (miR) profiles compared with healthy volunteers. WHAT IS KNOWN ALREADY Some studies have shown that cardiovascular risk is increased in young women with PCOS but the mechanisms by which this occurs are uncertain. Circulating MPs are elevated in patients with cardiovascular disease but the characteristics of MPs in patients with PCOS are unclear. STUDY DESIGN, SIZE, DURATION Case-control study comprising 17 women with PCOS (mean ± SD; age 31 ± 7 years, BMI 29 ± 6 kg/m2) and 18 healthy volunteers (age 31 ± 6 years, BMI 30 ± 6 kg/m2). PARTICIPANTS/MATERIALS, SETTING, METHODS The study was conducted in a University hospital. Nanoparticle tracking analysis (NTA) and flow cytometry (CD41 platelet, CD11b monocyte, CD144 endothelial) were used to determine MP size, concentration, cellular origin and annexin V positivity (reflecting phosphatidylserine exposure). Fatty acid analysis was performed by gas chromatography and MP miR expression profiles were compared by microarray. MAIN RESULTS AND THE ROLE OF CHANCE PCOS subjects showed increased MP concentrations compared with healthy volunteers (mean ± SD; 11.5 ± 5 × 1012/ml versus 10.0 ± 4 × 1012/ml, respectively; P = 0.03), which correlated with the homeostasis model of insulin resistance (r = 0.53, P = 0.03). This difference was predominantly seen in MPs whose size was in the small exosomal range (<150 nm in diameter, P< 0.05). PCOS patients showed a greater percentage of annexin V+ MPs compared with healthy volunteers (84 ± 18 versus 74 ± 24%, respectively, P = 0.05) but the cellular origin of MPs, which were predominantly platelet-derived (PCOS: 99 ± 0.9%; controls: 99 ± 2.5%), did not differ. MP fatty acid concentration and composition was similar between groups but 16 miRs were differentially expressed (P < 0.05). LIMITATIONS, REASON FOR CAUTION Patients with PCOS were classified by the Rotterdam criteria, which describes a less severe metabolic phenotype than other definitions of the syndrome. Our findings may thus not be generalizable to all patients with PCOS. MicroRNA expression analysis was only undertaken in an exploratory subset of the overall study population hence, validation of our findings in a larger cohort is mandatory. Furthermore, miR levels were unaltered for the highly expressed miRs and it is unclear whether differences in the lowly expressed miRs carries pathological relevance. WIDER IMPLICATIONS OF THE FINDINGS This study suggests that women with PCOS have an altered MP profile but further studies are needed to confirm this, to explore the mechanisms by which these alterations develop and to establish whether therapies that improve insulin sensitivity are able to reduce circulating MP concentrations.
AB - STUDY QUESTION Are circulating microparticles (MPs) altered in young women with polycystic ovary syndrome (PCOS)? SUMMARY ANSWER Women with PCOS have elevated concentrations of circulating platelet-derived MPs, which exhibit increased annexin V binding and altered microRNA (miR) profiles compared with healthy volunteers. WHAT IS KNOWN ALREADY Some studies have shown that cardiovascular risk is increased in young women with PCOS but the mechanisms by which this occurs are uncertain. Circulating MPs are elevated in patients with cardiovascular disease but the characteristics of MPs in patients with PCOS are unclear. STUDY DESIGN, SIZE, DURATION Case-control study comprising 17 women with PCOS (mean ± SD; age 31 ± 7 years, BMI 29 ± 6 kg/m2) and 18 healthy volunteers (age 31 ± 6 years, BMI 30 ± 6 kg/m2). PARTICIPANTS/MATERIALS, SETTING, METHODS The study was conducted in a University hospital. Nanoparticle tracking analysis (NTA) and flow cytometry (CD41 platelet, CD11b monocyte, CD144 endothelial) were used to determine MP size, concentration, cellular origin and annexin V positivity (reflecting phosphatidylserine exposure). Fatty acid analysis was performed by gas chromatography and MP miR expression profiles were compared by microarray. MAIN RESULTS AND THE ROLE OF CHANCE PCOS subjects showed increased MP concentrations compared with healthy volunteers (mean ± SD; 11.5 ± 5 × 1012/ml versus 10.0 ± 4 × 1012/ml, respectively; P = 0.03), which correlated with the homeostasis model of insulin resistance (r = 0.53, P = 0.03). This difference was predominantly seen in MPs whose size was in the small exosomal range (<150 nm in diameter, P< 0.05). PCOS patients showed a greater percentage of annexin V+ MPs compared with healthy volunteers (84 ± 18 versus 74 ± 24%, respectively, P = 0.05) but the cellular origin of MPs, which were predominantly platelet-derived (PCOS: 99 ± 0.9%; controls: 99 ± 2.5%), did not differ. MP fatty acid concentration and composition was similar between groups but 16 miRs were differentially expressed (P < 0.05). LIMITATIONS, REASON FOR CAUTION Patients with PCOS were classified by the Rotterdam criteria, which describes a less severe metabolic phenotype than other definitions of the syndrome. Our findings may thus not be generalizable to all patients with PCOS. MicroRNA expression analysis was only undertaken in an exploratory subset of the overall study population hence, validation of our findings in a larger cohort is mandatory. Furthermore, miR levels were unaltered for the highly expressed miRs and it is unclear whether differences in the lowly expressed miRs carries pathological relevance. WIDER IMPLICATIONS OF THE FINDINGS This study suggests that women with PCOS have an altered MP profile but further studies are needed to confirm this, to explore the mechanisms by which these alterations develop and to establish whether therapies that improve insulin sensitivity are able to reduce circulating MP concentrations.
KW - insulin resistance
KW - microparticles
KW - polycystic ovary syndrome
UR - http://www.scopus.com/inward/record.url?scp=84929646403&partnerID=8YFLogxK
U2 - 10.1093/humrep/deu281
DO - 10.1093/humrep/deu281
M3 - Article
C2 - 25336711
AN - SCOPUS:84929646403
SN - 0268-1161
VL - 29
SP - 2756
EP - 2763
JO - Human Reproduction
JF - Human Reproduction
IS - 12
ER -