Published online before print March 26, 2007, doi: 10.1161/HYPERTENSIONAHA.106.083972
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(Hypertension. 2007;49:1442.)
© 2007 American Heart Association, Inc.
Original Articles |
Relationship Between Androgen Levels and Blood Pressure in Young Women With Polycystic Ovary Syndrome
From the Departments of Obstetrics and Gynecology (M.-J.C., J.-H.Y., H.-N.H., Y.-S.Y.) and Internal Medicine (W.-S.Y.), National Taiwan University Hospital, Taipei, Taiwan, Republic of China; Graduate Institute of Clinical Medicine (M.-J.C., W.-S.Y., C.-L.C.), College of Medicine, National Taiwan University, Taipei, Taiwan, Republic of China; and the Institute of Biomedical Science (W.-S.Y.), Academia Sinica, Taipei, Taiwan, Republic of China.
Correspondence to Yu-Shih Yang, Department of Obstetrics and Gynecology, National Taiwan University Hospital, No. 7 Chung-Shan South Rd, 100, Taipei, Taiwan, Republic of China. E-mail ysyang{at}ha.mc.ntu.edu.tw
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Abstract |
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The role of testosterone on the development of hypertension is controversial, especially in women with polycystic ovary syndrome (PCOS) who have higher prevalence of obesity and insulin resistance than women without PCOS. Little is known about the association between serum testosterone level and blood pressure in young women with PCOS. In the 151 young Taiwanese women with PCOS enrolled in this cross-sectional study, we measured the body mass index, waist circumference, blood pressure, fasting glucose, fasting insulin, lipid profile, and hormone profiles. The free androgen index, total testosterone, and sex hormone-binding globulin, but not the level of dehydroepiandrosterone sulfate, significantly correlated with both systolic blood pressure (SBP) and diastolic blood pressure (DBP). In multiple linear regression models adjusted for age, body mass index, and other anthropometric, metabolic, and hormonal variables, the level of serum free androgen index or total testosterone, but not the sex hormone-binding globulin, were independently related to SBP and DBP. The age- and body mass index–adjusted least-square mean of serum-free androgen index levels were significantly different between the highest quartile and other quartiles of the SBP and DBP levels. The high bioavailable testosterone levels (free androgen index:
19%) in women with PCOS increased the risk of elevated blood pressure (SBP 130 mm Hg and/or DBP 85 mm Hg) with an odds ratio of 3.817 (P=0.029; 95% CI: 1.14 to 12.74) after adjustment for age, anthropometric measures, and metabolic profiles. Our results suggest that the characteristic hyperandrogenemia in young women with PCOS was associated with an elevated SBP and DBP independent of age, insulin resistance, obesity, or dyslipidemia.
Key Words: polycystic ovary syndrome • testosterone • systolic blood pressure • diastolic blood pressure • hypertension
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Introduction |
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Women with polycystic ovary syndrome (PCOS) are characterized by clinical and/or biochemical hyperandrogenism, oligomenorrhea, and the presence of polycystic ovaries.1 PCOS is a heterogenous medical condition. Because large individual variation is present with respect to hyperandrogenism in terms of clinical manifestations and biochemistry, not all women with PCOS have elevated testosterone levels. Indeed, some women with PCOS without elevated testosterone levels may have acne, hirsutism, and/or androgenic alopecia that may arise as a result of the elevated androgens secreted by adipose tissue and the adrenal glands rather than the testosterone secreted from the ovaries.
Although the increased risk of atherosclerotic cardiovascular disease and hypertension in women with PCOS remains controversial,2,3 a variety of intriguing metabolic disturbances related to the risk for cardiovascular disease and hypertension are commonly found in a large proportion of women with PCOS, such as obesity, insulin resistance, dyslipidemia, and the metabolic syndrome.4 Women with PCOS have been reported to have reduced vascular compliance,5 vascular endothelial dysfunction,6 and a higher mean arterial blood pressure7 in comparison with women without PCOS. Furthermore, the degree of impairment in vascular compliance and endothelial function, as well as the increased blood pressure, persists after adjusting for obesity and insulin resistance.5–7 Therefore, it is reasonable to speculate that the increased cardiovascular risk and hypertension in women with PCOS may be partially attributed to the characteristic state of hyperandrogenism.
Although there is little evidence to substantiate the association between hyperandrogenism and cardiovascular events,3,8 the role of sex differences in hypertension has been well reviewed.9,10 Blood pressure is higher in males than age-adjusted premenopausal women, beginning as early as puberty and persisting for life.10,11 In male rats, hypertension can be prevented by orchitectomy and can be reproduced by treatment with testosterone in castrated males or females,9 suggesting the essential role of testosterone in blood pressure regulation. On the other hand, this facilitated effect of testosterone on hypertension is not supported by several epidemiologic studies performed in elderly men12 and postmenopausal women.8 The age- and sex-specific effects may conceivably overshadow the effects of testosterone on hypertension.11 In the current study, we investigated the role of testosterone as a possible determining factor, other than obesity and other known metabolic risk factors, in affecting the blood pressure of young women with PCOS.
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Methods |
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Subjects
A total of 151 females with PCOS were included in this study. They had not been prescribed any medication before enrollment and were presented to our reproductive endocrinology clinic with a chief complaint of irregular menstrual cycles and/or clinical hyperandrogenism. The study was approved by the institutional review board of the National Taiwan University Hospital, and informed consent was obtained from all of the patients and/or their parents. We defined the clinical diagnosis of diabetes mellitus as a fasting plasma glucose
126 mg/dL and an elevated blood pressure as a systolic blood pressure (SBP) 130 mm Hg and/or a diastolic blood pressure (DBP) 85 mm Hg. The diagnosis of PCOS was made when 2 of the following 3 criteria existed, as proposed at the Rotterdam Consensus Meeting: oligomenorrhea or amenorrhea, clinical hyperandrogenism and/or hyperandrogenemia, and polycystic ovaries. Women with clinical hyperandrogenism but without hyperandrogenemia and either oligomenorrhea or polycystic ovaries were not enrolled in this study. Oligomenorrhea was defined as <8 spontaneous menstrual cycles per year in the 3 years before enrollment. Hyperandrogenemia was defined as a serum total testosterone level >0.8 ng/mL, with or without persistent acne, hirsutism (ie, a Ferriman–Gallwey score >8), and androgenic alopecia. The criteria for polycystic ovaries required visualization of 12 follicles, 2 to 9 mm in diameter, per ovary by transvaginal ultrasonography or an ovarian volume >10 cm3 by transabdominal ultrasonography with a distended bladder for virginal women. Exclusion criteria included hyperprolactinemia, thyroid dysfunction, Cushing’s syndrome, congenital adrenal hyperplasia, adrenal tumors, ovarian tumors, current or previous pregnancy within 1 year of enrollment, autoimmune disease, malignancy, central nervous system disease, current or previous use of oral contraceptives within 6 months of enrollment, or use of medications known to have an effect on the hypothalamic–pituitary–ovarian axis, such as antiandrogens, ovulation induction agents, antidiabetic medications, antiobesity medications, or glucocorticoids. All of the subjects were nonsmokers who did not consume alcoholic beverages on a regular basis. No subjects in the study had restricted physical activity because of handicap or other reasons, and no subjects were encouraged to exercise or engaged in work requiring physical labor.
Data Collection
Blood samples were collected from females with spontaneous menstrual cycles between the days 3 and 7 of a spontaneous menstrual cycle and between 8:00 AM and 10:00 AM after an overnight fast. For those subjects in whom amenorrhea exceeded 3 months, blood samples were collected without hormone-induced withdrawal bleeding, based on the results of pelvic sonography and a serum progesterone level. Specifically, if a dominant follicle was present and the serum estradiol level exceeded 150 pg/mL or the serum progesterone was >2 ng/mL, the blood sample was discarded. The subject was then asked to measure her basal body temperature, and a blood sample was collected during the next cycle after the menstruation after spontaneous ovulation. Blood was processed within 30 minutes of collection. Blood glucose and insulin samples were stored at 4°C and analyzed the day of sampling. Serum and plasma were aliquoted and frozen at –70°C until assayed. Anthropometric measurements, pelvic sonography, and the measurement of blood pressure were done on the day of and before venipuncture. For those women who were unable to undergo transvaginal sonography, venipuncture was performed before transabdominal sonography. Blood pressure was measured by the same trained physician using a standard mercury sphygmomanometer with an appropriate cuff size. Measurements were made on the right arm of the subjects while in a seated position and after a resting period of >30 minutes. Two readings were taken at 5-minute intervals, and the results were averaged.12,13 If the first blood pressure measurement differed significantly from the second blood pressure measurement (10 mm Hg SBP and/or DBP), we then measured the blood pressure a third time after an additional 5-minute rest and recorded the second and third blood pressure measurements as the result in an effort to reduce the so-called "white-coat effect." Except for body weight and waist circumference, the blood pressure observer was blind to other measurements and the hypothesis. The body mass index (BMI) was calculated as the weight in kilograms divided by the height in meters squared.
Assay Methods
The concentration of plasma glucose and the serum levels of low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), triglycerides, and insulin were measured as described previously.14 The homeostasis model assessment (HOMA) was applied to estimate the degree of insulin resistance (IR) [HOMA-IR=(glucosex0.05551)xinsulin/22.5], where insulin is expressed in microunits per milliliter, and glucose is expressed in milligrams per deciliter. Serum hormone profiles, such as follicle-stimulating hormone, luteinizing hormone, estradiol, progesterone, and serum hormone-binding globulin (SHBG), were measured as described previously.14 Serum total testosterone and dehydroepiandrosterone sulfate were measured by radioimmunoassay (Diagnostic Systems Laboratories). The free androgen index (FAI)15 was calculated according to the equation FAI (%)=testosterone (ng/mL)x3.47x100/SHBG (nmol/L). The intra-assay and interassay coefficients of variation of the aforementioned assays were all <10%.
Statistical Analyses
The numeric variables are presented as the untransformed mean±SD, unless indicated otherwise. The Shapiro–Wilk W test was used to identify whether all of the variables were normally distributed or not. Log transformation was performed on variables with significant deviation from a normal distribution before further analysis. Pearson correlation coefficients were calculated to determine the correlations between the clinical characteristics and SBP or DBP. Multiple linear regression models were performed using SBP or DBP as the dependent variable and anthropometric, metabolic, and hormonal factors as the independent variables. In these models, BMI or waist circumference was chosen to represent weight, and HOMA-IR was selected to represent fasting glucose and insulin to avoid collinearity. Logistic regression analysis was performed to assess the association between elevated blood pressure and the categorical data of the FAI (with a cutoff value at 19%, the highest quartile of FAI in this study) after adjustment for age, anthropometric measures, and metabolic factors. The least-square (LS) means of the FAI levels were calculated after adjustment for age and BMI among the subjects in different SBP and DBP quartiles by using ANOVA. A P<0.05 was considered statistically significant. All of the statistical analyses were performed using the PC version of the Statistical Analysis System (SAS version 9.1, SAS Institute Inc).
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Results |
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The clinical features of the subjects are summarized in Table 1. The majority of the subjects were young (87% of the subjects were <30 years of age, with a mean age of 24.43±5.02 years and a range of 14 to 37 years), and 94% were nulligravidas. There were only 5 subjects who met the diagnostic criteria for diabetes mellitus. As expected, the blood pressures, both SBP and DBP, significantly correlated with most metabolic variables related to the metabolic syndrome and insulin resistance (Table 2). The SBP and DBP positively correlated with age, waist circumference, BMI, HOMA-IR, fasting insulin, fasting glucose, LDL-C, triglycerides, and the FAI (Table 2 and Figure 1). The SBP and DBP negatively correlated with HDL-C and SHBG. No association existed between blood pressure and the hormonal profile, total cholesterol, or dehydroepiandrosterone sulfate (Table 2).
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Based on multiple linear regression analyses, the SBP and DBP were significantly related to the FAI (P=0.0008 and P= 0.0018, respectively), as well as age (P=0.005 and P<0.0001, respectively), after adjustment for BMI, HOMA-IR, LDL-C, HDL-C, and triglycerides (Table 3). No parameters were shown to have a modifying effect on the FAI in the models tested. When waist circumference was used instead of BMI in the same multivariable analyses as indicated in Table 3, the SBP and DBP were still significantly related to the FAI (ß=0.040, P=0.001 and ß=0.048, P=0.004, respectively). To evaluate the impact of total testosterone and the SHBG level on blood pressure in place of the FAI, we used SBP or DBP as the dependent variable, and the total testosterone level, SHBG, age, BMI, HOMA-IR, LDL-C, HDL-C, and triglycerides as independent variables for multivariate analysis. Serum total testosterone levels remained independently and positively associated with SBP (P=0.013) and DBP (P=0.034) after adjustment for SHBG, age, BMI, HOMA-IR, LDL-C, HDL-C, and triglycerides (Table 3).
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The age- and BMI-adjusted LS means of the FAI level among the subjects categorized according to SBP or DBP quartiles are shown in Figure 2. The age- and BMI-adjusted LS means of the FAI levels of women with PCOS in the highest SBP quartile (SBP: 119 mm Hg) were significantly higher than the FAI levels of women in the lowest and the second lowest SBP quartiles (P=0.019 and P=0.0006, respectively; Figure 2A). The age- and BMI-adjusted LS means of the FAI levels of women with PCOS in the highest DBP quartile were also significantly higher than the FAI levels of women in the lowest and the third DBP quartiles (P=0.017 and P=0.007, respectively; Figure 2B). It is noteworthy that the serum FAI level had a positive association with the SBP and DBP levels after adjustment for age and obesity. Using logistic regression analysis with an adjustment for age, BMI, HOMA-IR, HDL-C, LDL-C, and triglyceride levels, the high bioavailable androgen level (ie, an FAI 19%) was associated with a higher probability of an elevated blood pressure (ie, an SBP 130 mm Hg and/or a DBP 85 mm Hg), with an odds ratio of 3.817 (95% CI: 1.14 to 12.74; P=0.029). If waist circumference was used instead of BMI in the model with the same adjustments, the high androgen level was still significantly associated with the occurrence of elevated blood pressure with an odds ratio of 3.758 (95% CI: 1.08 to 13.14; P=0.038).
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Discussion |
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The effects of androgen on blood pressure are controversial.3,11–13,16 Because elevated androgens, such as dehydroepiandrosterone sulfate and testosterone (free and total), have been reported to associate with insulin resistance,17 obesity,18 and lipid metabolism19; therefore, elevated androgens may raise the risk for cardiovascular disease. The present study demonstrated that the serum bioavailable and total testosterone levels were significantly and positively correlated with both SBP and DBP in young women with PCOS, independent of insulin resistance, obesity, and dyslipidemia. The observed associations in this specific population suggest that the characteristic hyperandrogenemia in young women with PCOS is associated with the level of the blood pressure and may possibly contribute to the risks of hypertension and cardiovascular disease that may occur in middle age.
The mechanisms by which androgens initiate and/or mediate cardiovascular disease and hypertension have not been clearly elucidated. In all of the major genetically hypertensive rat models, blood pressure has been reported to be higher in male than in female rats of similar ages.9,11 Removal of the gonads reduces blood pressure in both genetic and nongenetic hypertensive male rats, but not in females, and the administration of testosterone increases the blood pressure in both genders.20,21 Testosterone replacement can restore and increase the blood pressure, plasma renin, and renal and hepatic angiotensinogen in both male and female gonadectomized rats.20 A recent study using in vivo microperfusion reported that androgen may directly upregulate the proximal tubule renin–angiotensin system and increase the volume reabsorptive rate, thereby increasing extracellular volume and blood pressure.22 In humans, endothelial dysfunction has been reported to be associated not only with insulin resistance but also with elevated free testosterone levels in postmenopausal women.6 In addition, serum androgen concentrations were reported to be an important predictor of blood pressure in young healthy women without PCOS.13
However, there are some studies that have led investigators to presume that androgens may not be responsible for initiating and/or mediating cardiovascular disease and hypertension. For example, epidemiologic studies have demonstrated an inverse association between blood pressure and testosterone in elderly men.12,23 Several studies involving postmenopausal populations suggested that circulating endogenous testosterone levels did not correlate with peripheral arterial disease and cardiovascular events.8,24 In addition, iatrogenic hyperandrogenism in female-to-male transsexuals did not result in increased hypertensive morbidity.16 Such observations may be because of the overshadowing effect of aging, because testosterone levels decline with age.25,26 It is also possible that the downregulation of androgen synthesis is a protective compensatory mechanism that occurs once the disease processes are initiated.21
A decline in testosterone levels with increasing age has been reported in premenopausal women, and the testosterone levels in women in their fifth decade of life are 
50% of those in women in their third decade.25,26 This phenomenon, the decline in testosterone with aging, was also reported specifically in women with PCOS.27 In addition, the source of androgen also changes with age. Peripheral conversion and adrenal gland production, instead of gonadal synthesis, is the main source of circulating testosterone after menopause and oophorectomy.25 In fact, we found a significant and independent correlation between SBP and DBP and circulating testosterone levels in women with PCOS at a young age, consistent with reports in other young healthy women without PCOS.13 A prospective, longitudinal study will be necessary to clarify whether the high circulating testosterone levels in women with PCOS at a young age actually contribute to hypertension later in life.
Asian women with PCOS have been reported to be less obese and have less apparent hyperandrogenic phenotypes than women of other ethnicities, but the prevalence of androgen excess, insulin resistance, and polycystic ovaries seems to be similar in comparison with other populations.28 Because the phenotype of clinical hyperandrogenism is not distinct in our population, and the diagnosis is very subjective, we chose more strict criteria for the definition of hyperandrogenism in our study. Therefore, it may be possible to restrict the applicability for generalized PCOS in this study. In addition, it was difficult to collect an adequate nonbiased representative control group in our study; therefore, we could not show whether the association between androgen and blood pressure was specific for women with PCOS, per se. However, a previous study13 demonstrated this association in young women without PCOS. Because the young women with PCOS in this study were less obese than most PCOS study populations,4,6,29 the importance of androgens rather than insulin resistance in our multiple linear regression models may emerge. Nevertheless, it should also be noted that our study did not identify a relationship between testosterone and either an increased incidence of hypertension, defined as a blood pressure 140/90 mm Hg, or an increased incidence of cardiovascular disease. In addition, this study did not prove the cause-and-effect relationship between testosterone and blood pressure, and the relationship observed in these females with PCOS may not apply to males.
Perspectives
Our results are consistent with the hypothesis that elevated testosterone levels at a young age in women with PCOS is correlated with SBP and DBP independent of age, insulin resistance, obesity, and dyslipidemia. These findings suggest that to prevent the future onset of cardiovascular disease and hypertension, control of the metabolic variables in women with PCOS, as well as their hyperandrogenism, might be considered. Further longitudinal follow-up research is needed to elucidate how the extent and the duration of testosterone exposure may impact the incidence of hypertension and cardiovascular disease in women with PCOS.
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Acknowledgments |
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Sources of Funding
This study was supported by grants NSC94-2314-B002-195 and NSC95-2314-B002-035 from the National Science Council of Taiwan.
Disclosures
None.
Received November 16, 2006; first decision December 5, 2006; accepted March 7, 2007.
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[Abstract/Free Full Text]
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