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The potential role of testosterone in hypertension and target organ damage in hypertensive postmenopausal women

Authors Li N, Ma R, Wang S, Zhao Y, Wang P, Yang Z, Jin L, Zhang P, Ding H, Bai F, Yu J

Received 21 November 2018

Accepted for publication 27 February 2019

Published 29 April 2019 Volume 2019:14 Pages 743—752

DOI https://doi.org/10.2147/CIA.S195498

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Editor who approved publication: Dr Zhi-Ying Wu


Ningyin Li, Ruixin Ma, Shixiong Wang, Yang Zhao, Ping Wang, Zhitao Yang, Lingling Jin, Panpan Zhang, Hong Ding, Feng Bai, Jing Yu

Department of Cardiology, Lanzhou University Second Hospital, Lanzhou University, Lanzhou, Gansu 730000, People’s Republic of China

Objective: The aim of this study was to confirm the potential role of testosterone in hypertension and target organ damage (TOD) in hypertensive postmenopausal women.
Methods: A matched group study was conducted. One hundred sixty-one hypertensive postmenopausal women between 45 and 65 years of age were enrolled as group 1. Another 161 age-matched hypertensive men were enrolled as group 2. Ambulatory blood pressure monitoring, echocardiographic imaging, vascular function, sex hormones and clinical characteristics were evaluated. Quantitative data were analyzed using independent Student’s t-test and multiple regression analysis.
Results: The mean and load level of blood pressure were lower in women than in men (P<0.05), except for the mean level and load of the nocturnal systolic blood pressure (SBP) (123.77±15.72 mmHg vs 126.35±15.64 mmHg, and 50.43±30.31% vs 55.35±28.51%, P>0.05). However, the carotid-femoral pulse wave velocity (cf-PWV) in women was higher than that in men (9.68±2.23 m/s vs 8.03±2.82 m/s, P<0.05). The ratio of the early diastolic mitral peak flow velocity to early diastolic mitral annular velocity (E/Em) was obviously impaired (13.06±3.53 vs 12.05±3.68, P<0.05) in women. Furthermore, in women, a positive correlation was found between testosterone and cf-PWV (γ=0.157, P=0.046), and Cf-PWV was positively related to the mean level of nighttime SBP (γ=0.210, P=0.008). Moreover, nocturnal SBP was a risk factor for E/Em (γ=0.156, P=0.048, P<0.05).
Conclusion: Testosterone may play a role in the correlation between hypertension and TOD in hypertensive postmenopausal women.
Clinical Trial number: This research study was registered under the ClinicalTrials.gov PRS Website (NCT03451747).

Keywords: postmenopausal women, hypertensive, left ventricular diastolic function, carotid-femoral pulse wave velocity, testosterone

Introduction

Hypertension, a common chronic condition that affects up to 40% of human adults,13 is a major risk factor for stroke, heart attack, and other vascular as well as renal and metabolic diseases.2,47 Hypertension, which is associated with target organ damage (TOD),8 is a serious cause of cardiovascular and cerebrovascular diseases.9 As the body ages, blood pressure (BP) tends to increase in both men and women.1014 However, men generally have a higher BP and an increased prevalence of cardiovascular disease (CVD) than age-matched women until after menopause, when the phenomenon reverses.10,11,13,15 Moreover, the increase in deaths from CVD is generally higher in hypertensive postmenopausal women than in men.16 Hypertension is a major risk factor for the excessive morbidity and mortality caused by TOD,8,17 such as left ventricular diastolic dysfunction (LVDD), in postmenopausal women.15

Menopause is an important change in the estrogen/androgen ratio. The difference in BP between men and women is caused by the protective role of estrogens18 or the pro-hypertensive role of testosterone (T).18 Previous studies have found that endogenous estradiol (E2) may play an important role in lowing BP,19,20 reducing the level of inflammation,19 preventing endothelial dysfunction, and protecting against cardiovascular tissue remodeling. Therefore, a lack of E2 is an important factor in the increased prevalence of CVD and hypertension in postmenopausal women.21,22 However, over the past 20 years, the level of total T has been shown to be a risk factor for SBP and death.2325 Moreover, American women26,27 have high serum T levels, and the frequency of hypertension is increased in this population.28 Thus, an imbalance between estrogen and androgen may be an important factor in reversing the prevalence of CVD and hypertension.28,29 Therefore, we hypothesize that T plays a role in hypertension and TOD in hypertensive postmenopausal women. The objective of this work is to evaluate the effects of T on hypertension and TOD in hypertensive postmenopausal women.

Methods

Study population

This study is a matched cross-sectional study. The least sample size required was estimated by the formula of independent sample frequency test N=. One side was taken as a=0.05, β=0.10, and using the look up table, and we obtain uα=1.96, uβ=1.28. The related literature was searched, and the maximum value of δ (α=1.4) and the minimum value of δ (δ=0.63) were incorporated into the formula N=. A total of 322 hypertensive patients hospitalized in our department between October 2016 and February 2017 were enrolled. The inclusion criteria were as follows. First, participants were aged between 45 and 65 years. Second, female patients were all postmenopausal women. Third, all patients were diagnosed with essential hypertension according to the Guidelines Prevention and Treatment of Hypertension in China.

This study was conducted in accordance with the Declaration of Helsinki. Only relevant personal and medical information from the patients included in the study were collected. In the study, we fully considered and implemented measures to protect patient privacy, such as replacing the patient’s name with a digital code. This study was supported by the youth fund of the “Cuiying science and technology innovation” program of Lanzhou University Second Hospital (CY2017-QN09). This study was approved by the Ethics Committee of Lanzhou University Second Hospital (20101024038). All of the patients signed an informed consent form before any medical information was retrieved.

Clinical and anthropometric measurements

Clinical characteristics, such as height, weight, BMI,30 BP, history of hypertension, family history, anti-hypertensive medication use, and other metabolic indices, were collected.

Clinical chemistry and serum sex hormone levels

Sex hormone levels including T, E2, luteinizing hormone (LH), prolactin (PRL), follicle stimulating hormone (FSH) and progesterone (P) were examined by a chemiluminescence immunoassay.31

Office BP

Office BP was measured by certified researchers with an Omron Model M7 digital automatic BP monitor (Omron Healthcare, Inc., Lake Forest, IL). The office BP level was recorded as the mean value of separate readings from the second and third measurements.32

Ambulatory blood pressure monitoring (ABPM)

Noninvasive ABPM was performed for every enrolled patient with ABPM equipment (Spacelabs 90207, Spacelabs, Redmond, WA).

The data from the 24 hrs ABPM measurements were imported using automated software (Shuoyun ABPM remote analysis management software, China, version 1.0) on a computer.33

Measurement of vascular TOD and central hemodynamics

A SphygmoCor device (software SphygmoCorCvMS, v8.1; AtCor Medical, Australia) was used to perform measurements on the right side of the body.34,35

The augmentation index (AIx) was calculated and expressed as a percentage.36 The average value of the two tests were used in subsequent analyses.37

Because of the dependence of AIx on heart rate (HR), AIx was normalized to a HR of 75 beats per minute (AIx@HR75).38

Cf-PWV was measured by an automatic device (Complior, Artech, France) from SphygmoCor on the right femoral artery and right common carotid artery.39,40 Cf-PWV was determined according to the pulse transit time divided by the travel distance.41 The measurements with an operator index of more than 80% were accepted and included in the analysis.42 According to the present guidelines,1,43,44 cf-PWV measurements of more than 10 m/s were considered to indicate increased arterial stiffness.45

Echocardiography

An echocardiographic examination was performed using a commercially available ultrasound system (Vivid 9, GE Healthcare, Horten, Norway) with a 2.5 MHz transducer.

A 2-dimensional transthoracic echocardiography was performed to assess the LV volume, and the LVDD was calculated. The LV end-diastolic diameter (LVEDd) and end-systolic diameter (LVESd), interventricular septum thickness (IVST), and posterior wall thickness (PWT) were acquired from the parasternal long- and short-axis views using M-mode echocardiography at the level of the mitral valve leaflet tips, according to the recommendations of the American Society of Echocardiography.46

The LVMI was calculated as LVM normalized to the body surface area.47

Diastolic function was evaluated by pulse wave Doppler recordings during diastole in the apical four-chamber view.48

Statistical analysis

Statistical analysis was performed using the SPSS statistical package (version 23.0; SPSS Inc., Chicago, Illinois, USA). Continuous variables are presented as the mean and standard deviation (SD). The differences in relative indicators between men and women were assessed by independent Student’s t-test. Multiple linear regression analysis was used to assess the association between different indicators. The above differences were tested by two-way analysis of variance. A P-value <0.05 was considered statistically significant. And the data sharing statement indicating were shown in Table 1.

Table 1 Data sharing statements that fulfill these ICMJE requirements

Results

Clinical characteristics

According to the inclusion and exclusion criteria, 322 patients aged 45–65 years were included in our study, including 161 men and 161 women. Participants in the male and female groups were matched in terms of age, level of BP, blood glucose, blood lipid, history of hypertension and anti-hypertensive medication use.

The main demographic characteristics of 322 individuals are summarized in Table 2 according to sex. The average age of the men was 55.95±5.89, which was similar to that of the women (55.91±5.89). The biochemical parameters showed no differences between the two groups, except for the level of serum creatinine, which was higher in men than in women (78.77±11.04 μmmol/L vs 68.14±13.92 μmmol/L, P=0) (Table 2). However, the biochemical parameters were within the normal range.

Table 2 Comparisons of clinical characteristics and metabolic indexes between two groups (N=322)

In detail, patients in both of the groups were treated with the antihypertensive medications, including angiotensin-converting enzyme inhibitors (ACEI), angiotensin receptor blocker (ARB), β-blocker, calcium channel blockers (CCB), diuretic and the combination on ACEI or ARB with CCB or diuretic (Table 3).

Table 3 The characteristics of antihypertensive drugs for all hypertensive patients in this study (N=322)

Sex hormone levels

PRL, FSH and LH in the female group were higher than those in the male group (Table 4). Male patients had higher levels of T than did female subjects.

Table 4 Comparisons of sex hormone levels between two groups (N=322)

Twenty-four-hour ABPM

The mean level and load of 24 hrs BP, daytime BP and nighttime DBP of males were higher (P<0.05) (Table 4). However, these differences disappeared when comparing the mean level and load of nighttime SBP between the different sexes. This finding indicates that the nighttime SBP of female patients did not decrease (Table 5).

Table 5 Comparisons of ambulatory blood pressure monitoring characteristics between two groups (N=322)

Comparison of the cardiovascular ultrasound parameters

Male patients had significantly higher left atrial diameter (LAD), LVEDd, IVST and LVM values than women (Table 6).

Table 6 Comparisons of cardiac structure and function between two groups (N=322)

Male subjects had higher LVEDV, LVESV and stroke volume (SV) than women (Table 6).

When cardiovascular diastolic function was analyzed, E/Em was higher in women than in men (Table 6).

Vascular indices of organ damage

Women had higher AIx, AIx@HR75 and PWV values than men, while the central DBP in women was lower than that in men (Table 7).

Table 7 Comparisons of central hemodynamics and vascular function between two groups (N=322)

Multiple linear regression analysis

T was positively and independently correlated with PWV values in female patients but not in male patients (γ=0.157, P=0.046) (Table 8).

Table 8 The correlation ship between testosterone and TOD (N=322)

A strong positive correlation was found between PWV and mean nighttime SBP (γ=0.210, P=0.008). Moreover, nocturnal SBP was a risk factor for E/Em values (γ=0.156, P=0.048) (Table 8).

Discussion and conclusion

According to the results of this study, BP was lower in hypertensive postmenopausal women than in men. However, this trend disappeared for nighttime SBP. Moreover, atherosclerosis in hypertensive postmenopausal women was significantly higher than that in men. Furthermore, LVDD in hypertensive female patients was significantly worse than that in male patients. E2 has been reported to protect against hypertension in postmenopausal women.49

Other research has suggested that signs and symptoms of hypertension mostly occurred after TOD.50 Moreover, atherosclerosis is the major cause of CVD and one of the main pathological mechanisms of hypertension.51 Other studies have suggested that higher BP in hypertensive patients during the night might lead to greater endothelial damage. Furthermore, greater endothelial damage would lead to higher levels of nocturnal BP.4,49 Isolated nighttime hypertension might predict cardiovascular events.52 Moreover, the lack of decline in nocturnal BP has been confirmed to be a crucial risk factor in atherosclerosis.2,53 Epidemiological studies have suggested that hypertensive men have a higher risk for CVD than age-matched women,11,13 but this phenomenon is less stratified after menopause.22,53 The difference of risk for CVD may be attributed to the protective effect of estrogen and the harmful effect of androgens.54 Some research has shown that androgen withdrawal is positively correlated with arterial stiffness and the risk of CVD in male patients.15 However, other studies have shown the opposite effect that T has protective effects on the cardiovascular system and other target organs.55

Due to the effects of T on blood lipid metabolism, it exerts opposite effects in men and women. T plays a favorable role in men but may be harmful to women. These effects of T are based on its binding to the relevant receptors. Androgen receptors have been shown to be distributed in vascular smooth muscle and endothelial cells,56 which may be the reason for the differential effects of T on endothelial function and nocturnal SBP observed in this study. However, when the concentrations of T are at physiological values, T can increase the endothelial synthesis of NO through several pathways and can also directly enhance NO production in endothelial cells.57 In women, T is synthesized by theca cells in the ovary, placenta, and adrenal cortex.58 Previous studies have suggested that both T and estrogen influence endothelial function by modulating NO release.22 Moreover, the exact mechanisms of modulating endothelial function may involve activated Akt and MAPK pathways.59 Although an abrupt decrease in estrogen occurs in women after menopause, the level of T in men gradually decreases by approximately 1–2% every year in early adulthood.60,61 Another prospective observational study demonstrated that a low level of T was associated with an increased risk of mortality for male patients.23 It is well known that approximately 15–25% of men over 50 years old have lower levels of T than men younger than 50 years old.62 Although the level of T in men is approximately 10 times that in women, women are more sensitive to T.58 According to the abovementioned differences in physiological changes from sexual hormones and the distinct trends in nocturnal SBP in male and female hypertensive patients, T might play a role in the divergent relationship between nighttime SBP and TOD. For postmenopausal women, the level of reactive oxygen species (ROS) increases significantly. Research has also demonstrated that T can promote the generation of ROS, which decreases NO bioavailability for vasodilation.63 Substantial data support the idea that T positively mediates vasoconstriction.64

Taken together, testosterone levels in men and women are very different. In men, high levels of testosterone have protective effects such as vasodilation, but these are diminished as testosterone levels decline with age. For postmenopausal women, although the testosterone level is very low, it is slightly higher than that before menopause, which leads to TOD. Therefore, we hypothesized that testosterone binds to different receptors and works through different mechanisms in men and women. Thus, testosterone should be one of the key factors analyzed in future works investigating the damage to and protection of target organs in hypertensive postmenopausal women.

Previous studies have demonstrated the importance of monitoring daytime and nighttime BP, which are risk factors for cardiovascular mortality and other TOD.47,65 Therefore, the decrease in mean BP-values during sleep by ABPM may be the only factor—or the most important factor—that can provide information for clinical treatment for and prediction of TOD.6668 A decrease in nocturnal BP of less than 10% is considered nondipping, which is observed frequently in postmenopausal women.33 In hypertensive postmenopausal women, increased levels of T, ROS and inflammation, which were confirmed to be associated with the nondipping pattern, could lead to endothelial dysfunction.69 Although previous studies have indicated that T has vasodilating properties, this positive effect is attenuated by its atherogenic effect. As noted in vitro experiments, T may increase the adhesion of monocytes to the vascular endothelium. In addition, T has been shown to have an opposite effect on estrogen in the cardiovascular system. Androgens can further exert endothelial dysfunction by regulating the renin-angiotensin system.70 Higher T levels in men and higher E2 levels in women are considered to be key factors in CVD.71 Furthermore, endothelial damage causes higher BP during sleep.50,72 It has also been suggested that there is an independent association between higher nighttime SBP and early-stage atherosclerosis.73

Based on the results of this study, the cardiac structure of hypertensive postmenopausal women was different from that of age-matched hypertensive men, even though their cardiac systolic function was similar. The cardiac diastolic function of female patients was significantly worse than that of male patients. According to the analyses, we found that decreases in nocturnal SBP and PWV were risk factors for left ventricular diastolic function in hypertensive postmenopausal women and that T was positively correlated with nocturnal SBP and the degree of atherosclerosis. Therefore, we speculate that T plays a role in hypertension and TOD in hypertensive postmenopausal women.

Limitations

This is a cross-sectional study that neither considers the timing of exposure and outcomes nor examines the causal relationship between exposure and outcomes. As it is a convenience sample and it is not representative, the findings are not conclusive.

Disclosure

The authors report no conflicts of interest related to this study.

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