Chronic Cigarette Smoking Impairs Erectile Function through Increased Oxidative Stress and Apoptosis, Decreased nNOS, Endothelial and Smooth Muscle Contents in a Rat Model

Revisiting experimental models of erectile dysfunction and their value in drug discovery and development

INTRODUCTION

Erectile dysfunction (ED) is a common condition that often signals underlying endothelial dysfunction, although the underlying causative factor(s) are likely complex and multifactorial. Various animal models have been developed to provide a research platform to study ED and served as an important basis for the discovery and subsequent development of novel therapeutic drugs for ED.

AREAS COVERED

The review article provides an overview of various animal models in ED research with an emphasis on important drug target discovery relating to each specific experimental model. The authors highlight translation from basic science research to major preclinical and clinical studies in this evolving field of ED research.

EXPERT OPINION

Animal models simulate the pathological features of various types of ED and clarify their molecular mechanisms. These mechanisms aid in discovering drug targets, while established ED models also provide a basis for validating drug efficacy, safety, and specific action mechanisms. The development of techniques in detection methods, cellular experimental, and omics has a profound impact on disease prediction, model evaluation, and optimization of therapeutic modalities. On this basis, many drug therapies targeting these ED-related mechanisms, especially in the nitric oxide/cyclic guanosine monophosphate pathways have been applied in preclinical studies. However, focusing on drug development for those types of ED where phosphodiesterase 5 inhibitor therapy is limited may be more valuable.

Decadal changes in nocturia among American middle-aged and older men

AIM

To estimate the prevalence of nocturia in middle-aged and elderly men and evaluate its associated factors and changes over time.

METHODS

Data of middle-aged and older men aged ≥40 years from the 2007-2008 and 2017-2020 cycles of the National Health and Nutrition Examination Survey were retrospectively analyzed. The prevalence of nocturia was estimated using participant questionnaires on nocturia, lifestyle-related factors, and health factors, and its decadal changes were examined using multivariate logistic regression analysis to determine related factors associated with the prevalence of nocturia.

RESULTS

The prevalence of nocturia was 38.0% in 2007-2008 and 39.6% in 2017-2020, with no significant increase observed (P = 0.3989). Being a non-Hispanic black was positively correlated with nocturia (adjusted odds ratio [AOR] = 1.54, 1.22-1.93, P < 0.001), whereas the correlation with being a Mexican American disappeared (AOR = 1.25, 0.90-1.73, P = 0.187). Diabetes (AOR = 1.32, 1.07-1.64, P = 0.010) and sleep disorders (AOR = 1.31, 1.07-1.60, P = 0.008) showed a statistically significant positive correlation with nocturia, whereas a significant negative correlation was observed between employment (AOR = 0.66, 0.54-0.82, P < 0.001) and nocturia. Above-high-school education (AOR = 0.60, 0.47-0.76, P < 0.001) showed a constant trend toward a negative correlation with nocturia. The correlation between high school education or general educational development and nocturia disappeared (AOR = 0.81, 0.62-1.05, P = 0.112).

CONCLUSION

Diabetes and sleep disorders contribute to the development of nocturia, while work and high educational attainment can actively combat nocturia. Geriatr Gerontol Int 2024; 24: 1308-1314.

Bioinformatics Combined With Experimental Modeling to Study the Molecular Mechanism of Xuefu Zhuyu Decoction to Improve Erectile Dysfunction Associated With Asthma in Rats

Asthma is associated with chronic systemic inflammation, and inflammatory factors can damage vascular endothelial cells, thus impairing erectile function (ED). Xuefu Zhuyu decoction (XFZYD) can inhibit inflammation and promote angiogenesis, which in turn improves asthma as well as ED, but its exact mechanism of action is not yet clear. This study investigates the mechanism underlying the beneficial effect of XFZYD on asthma-associated ED. High-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was used to analyze the constituents of XFZYD, and network pharmacology analysis was used to predict the target genes of XFZYD. Sprague-Dawley rats in the asthma model with erectile dysfunction were divided into the model, XFZYD low-, medium-, and high-dose group (3.09, 6.17, and 12.34 g/kg), with drug intervention for 8 weeks. We assessed the interleukin 6 (IL-6), vascular endothelial growth factor A (VEGFA), and tumor necrosis factor (TNF) protein levels in the penile tissue. We discovered that after treatment with XFZYD (3.09, 6.17, and 12.34 g/kg), the number of erections significantly increased (1.17 ± 0.41, 1.50 ± 0.55, and 1.67 ± 0.52), the density of endothelial cells in the corpus cavernosum of the penis increased, the expression level of IL-6 was reduced (7.5%, 21.2%, and 24.4%), the expression level of VEGFA was reduced (7.8%, 25%, and 28.4%), and the expression level of TNF was reduced (13.5%, 30.6%, and 32.4%). The in vivo experiments indicate that XFZYD may improve ED in asthma model rats by inhibiting inflammation and reducing vascular permeability. This study provides new insights into the mechanism of action of XFZYD in the treatment of asthma leading to ED.

Cigarette smoking and erectile dysfunction: an updated review with a focus on pathophysiology, e-cigarettes, and smoking cessation

Introduction

Cigarette smoking has major health implications and causes substantial damage to all organ systems. Approximately one-third of men are active smokers worldwide, and most men are unaware that cigarette smoking can contribute to erectile dysfunction (ED).

Objectives

This article aims to provide a comprehensive overview of research conducted on cigarette smoking and ED, with a particular focus on pathophysiology, electronic cigarettes (e-cigarettes), and smoking cessation.

Methods

A manual literature search was conducted on all research conducted on cigarette smoking and ED up to October 2022.

Results

Substantial evidence is now available showing that past and current cigarette smoking has dose-dependent associations with ED in studies controlling for age and important health comorbidities. Cigarette smoke contains nicotine, carbon monoxide, oxidant chemicals, and metals that can damage the endothelium and disrupt erectile processes. For current smokers, smoking abstinence can strengthen the endothelium and reverse diminished erectile function. The effect of e-cigarettes on endothelial damage and ED remains largely untested. E-cigarettes expose users to fine and ultrafine particles and toxins that can increase risk of cardiovascular injury, but these acute effects appear less potent than conventional cigarettes (long-term cardiovascular effects are still unknown). E-cigarettes are therefore likely to have less harmful effects on ED than conventional cigarettes.

Conclusions

Smoking cessation programs that focus on nicotine replacement therapy (transdermal patches, gum, or inhalers), behavioral counseling, social support, and education programs can be effective approaches to ED treatment in active smokers. Temporarily transferring from regular cigarettes to e-cigarettes—which transmit some of the same carcinogens as conventional cigarettes and are likely to have some long-term cardiovascular effects that disrupt erectile function—might also be useful for long-term smoking cessation and treatment of ED.

Causal relationship between obesity, lifestyle factors and risk of benign prostatic hyperplasia: a univariable and multivariable Mendelian randomization study

BACKGROUND

Obesity (waist circumference, body mass index (BMI)) and lifestyle factors (dietary habits, smoking, alcohol drinking, Sedentary behavior) have been associated with risk of benign prostatic hyperplasia (BPH) in observational studies, but whether these associations are causal is unclear.

METHODS

We performed a univariable and multivariable Mendelian randomization study to evaluate these associations. Genetic instruments associated with exposures at the genome-wide significance level (P < 5 × 10-8) were selected from corresponding genome-wide associations studies (n = 216,590 to 1,232,091 individuals). Summary-level data for BPH were obtained from the UK Biobank (14,126 cases and 169,762 non-cases) and FinnGen consortium (13,118 cases and 72,799 non-cases). Results from UK Biobank and FinnGen consortium were combined using fixed-effect meta-analysis.

RESULTS

The combined odds ratios (ORs) of BPH were 1.24 (95% confidence interval (CI), 1.07-1.43, P = 0.0045), 1.08 (95% CI 1.01-1.17, P = 0.0175), 0.94 (95% CI 0.67-1.30, P = 0.6891), 1.29 (95% CI 0.88-1.89, P = 0.1922), 1.23 (95% CI 0.85-1.78, P = 0.2623), and 1.04 (95% CI 0.76-1.42, P = 0.8165) for one standard deviation (SD) increase in waist circumference, BMI, and relative carbohydrate, fat, protein and sugar intake, 1.05 (95% CI 0.92-1.20, P = 0.4581) for one SD increase in prevalence of smoking initiation, 1.10 (95% CI 0.96-1.26, P = 0.1725) and 0.84 (95% CI 0.69-1.02, P = 0.0741) for one SD increase of log-transformed smoking per day and drinks per week, and 1.31 (95% CI 1.08-1.58, P = 0.0051) for one SD increase in sedentary behavior. Genetically predicted waist circumference (OR = 1.26, 95% CI 1.11-1.43, P = 0.0004) and sedentary behavior (OR = 1.14, 95% CI 1.05-1.23, P = 0.0021) were associated with BPH after the adjustment of BMI.

CONCLUSION

This study supports independent causal roles of high waist circumference, BMI and sedentary behavior in BPH.

Association between erectile dysfunction, cardiovascular risk factors, and coronary artery disease: Role of exercise stress testing and International Index of Erectile Function (IIEF-5) questionnaire

Background

The exercise stress test (EST) is a non-invasive investigation to diagnose coronary artery disease. This research aimed to determine the relationship between erectile dysfunction (ED), cardiovascular risk factors, and coronary artery disease (CAD) in men referred for EST.

Methods

A prospective cohort study enrolling 303 patients from August 2020 through September 2021. All patients filled out the international Index of Erectile Function (IIEF-5) questionnaire. . They underwent an exercise stress test (EST). A two-tailed independent sample t-test, chi-square tests, and binary logistic regression were used for statistical analysis.

Results

EST was positive in 110 (36.3%) patients, negative in 154 (50.8%), and inconclusive in 39 (12.8%) patients. ED was present in 225 (74.3%) patients and absent in 78 (25.8%) patients. 278 (91.7%) had one or more cardiovascular risk factors. This study reported a significant relationship between diabetes mellitus (DM), hypertension (HTN), and the results of EST and ED. Compared to patients without ED, patients with ED had a positive EST result. Definite CAD was diagnosed in 21% of patients with ED compared to 1.3% in patients without ED. For a one-unit increase in age, the odds of ED increased by about 5%. Similarly, a negative EST is compared to a positive EST. Negative EST reduced the likelihood of ED by 82%.

Conclusions

This research found a statistically significant connection between CAD, certain cardiovascular risk factors, and ED using the EST and IIEF-5 questionnaires. This research is significant because it may alter the way cardiovascular risk stratification is done.

Effect of Black Cumin Ethanolic Extract Administration to Superoxide Dismutase and Malondialdehyde in Inhibiting Endothelial Dysfunction in Cigarette Exposed Rats

BACKGROUND

Oxidative stress caused by various components in cigarette smoke can induce endothelial dysfunction. Black cumin (Nigella sativa) has an oxidative stress inhibition capability by increasing antioxidant enzyme production and decreasing lipid peroxidation.

METHOD

This is an in vivo study with a post-test only design using Wistar rats as subjects. Rats were randomly assigned into five groups: negative control (NC) group without any treatment, positive control (PC) group exposed to cigarette smoke only, and treatment groups (T1, T2, and T3) which received exposure of cigarette smoke and administration of black cumin extract with doses of 0.3 g/kg BW/day (T1), 0.6 g/Kg BW/day (T2), and 1.2 g/kg BW/day (T3). After four weeks, samples were sacrificed with the aortas taken to measure superoxide dismutase (SOD) activity and malondialdehyde (MDA) level.

RESULTS

A significant reduction in SOD activity (p=0.022) was found between the NC and PC groups but not in MDA level (p=0.394). SOD activity increased significantly in T2 when compared to PC (p=0.007). MDA levels significantly increased at T1 (p=0.002), T2 (p=0.005), and T3 (p=0.006) when compared to PC.

CONCLUSION

Black cumin ethanolic extract increased SOD activity in Wistar rats exposed to cigarette smoke. However, no reduce of MDA level was observed.

Oxidative stress-responsive apoptosis-inducing protein in patients with heterozygous familial hypercholesterolemia

Oxidative stress, an inducer of apoptosis, plays a critical role in ischemia/reperfusion injury and atherosclerosis. We previously identified an apoptosis-inducing ligand, the post-translationally modified secreted form of eukaryotic translation initiation factor 5A (eIF5A), 'oxidative stress-responsive apoptosis-inducing protein' (ORAIP). In this study, we investigated the role of ORAIP in patients with heterozygous familial hypercholesterolemia (HeFH), a leading cause of premature cardiovascular disease. We analyzed plasma ORAIP and oxidized low-density lipoprotein (oxLDL) levels in 60 patients with HeFH (60% male, 57.0 ± 13.6 years of age) and 20 patients with LDL-C hypercholesterolemia (DL, 85% male, 64.1 ± 13.3 years of age). The coronary artery atherosclerosis from the patients with HeFH who had a coronary artery bypass graft was investigated by double immunostaining. The plasma ORAIP levels in the patients with HeFH were significantly elevated compared to those in the patients with DL (73.5 ± 46.0 vs. 48.3 ± 21.4 ng/mL, p = 0.0277). The plasma oxLDL levels in HeFH patients were also elevated (156.8 ± 65.2 vs. 123.7 ± 46.6 mg/dL, p = 0.0461) compared to those in DL patients and correlated with maxLDL-C levels (R = 0.4454, p = 0.00648). Double-immunostaining of ORAIP and oxLDL in the coronary artery from patients with HeFH who had a coronary artery bypass graft showed that ORAIP and oxLDL were colocalized with apoptotic vascular smooth muscle cells in the atherosclerotic plaque. ORAIP plays a role in the development of oxidative stress-induced atherosclerosis and may be an important therapeutic target for plaque rupture in patients with HeFH.

The effect of subchronic cigarette smoke exposure on oxidative stress parameters and endothelial nitric oxide synthase in a rat aorta

BACKGROUND

The compounds in cigarette smoke are believed to cause oxidative stress, leading to endothelial dysfunction. Understanding the mechanism of endothelial dysfunction due to cigarette smoke is useful for the development of early and preventive therapy for cardiovascular diseases (CVDs) with smoking risk factors.

METHODS

In this experimental study, a posttest-only control group design was used. 20 Wistar rats were divided into two groups: a smoking group (exposed to 40 cigarettes per day for 4 weeks) and a control group. After the exposure, the animals were sacrificed and aortas were removed for measurement of malondialdehyde (MDA), superoxide dismutase (SOD), endothelial nitric oxide synthase (eNOS), intima-media thickness (IMT), and for histological analysis.

RESULTS

Exposure to cigarette smoke caused a significant decrease in SOD activity (24.28 ± 4.90; P = 0.027) and eNOS levels (50.81 ± 4.18; P = 0.014), but no significant effect on the level of MDA (17.08 ± 5.78; P = 0.551). Histological analysis showed an increase in IMT (13.27 ± 2.40; P = 0.000) and disorganization and vacuolation of smooth muscle cells in tunica media after exposure to cigarette smoke. The regression analysis showed a significant negative relationship between the eNOS level and IMT (β = -1.012, P = 0.009).

CONCLUSION

Subchronic exposure to cigarette smoke caused a decrease in SOD activity and eNOS levels, but no significant change in MDA levels. This study also indicated that smoking causes IMT thickening and pathological structural changes in the aorta. Another finding indicated that a decrease in eNOS levels could cause an increase in the IMT of the aorta.

Intracavernous Injection of Autologous Platelet-Rich Plasma Ameliorates Hyperlipidemia-Associated Erectile Dysfunction in a Rat Model

Introduction

Hyperlipidemia is associated with an increased risk of erectile dysfunction (ED) mediated by endothelial damage. Platelet-rich plasma (PRP) contains numerous angiogenic growth factors. Currently, evidence supporting the use of PRP for ED treatment is limited.

Aim

We investigated PRP in a rat model of hyperlipidemia-associated ED.

Methods

Thirty 2-month-old male Sprague–Dawley rats were randomly divided into 3 groups. 20 rats were fed a high-fat diet for 5 months and were randomly divided into 2 groups: (i) rats in the H group received supernatant injection into the corpus cavernosum weekly for 4 weeks; (ii) rats in the H + PRP group received PRP injection into the corpus cavernosum weekly for 4 weeks. 10 rats were fed a standard diet for 5 months and received supernatant injection into the corpus cavernosum weekly for 4 weeks (N group). 7 days after the 4th injection, all rats underwent erectile function testing and then euthanasia.

Main outcome measures

Erectile function was evaluated by measuring intracavernous pressure (ICP) and mean arterial pressure (MAP). Serum and penile tissue were collected for metabolic variable assessment and histochemical examination, respectively.

Results

Intracavernous pressure/MAP and area under the curve/MAP ratios were significantly higher in the N and H + PRP groups than in the H group. Insulin-like growth factor-1, brain-derived neurotrophic factor, and vascular endothelial growth factor levels were significantly higher in the H + PRP group than in the N and H groups. Corporal neuronal nitric oxide synthase, endothelial nitric oxide synthase, and endothelial cells were weakly expressed in the H group compared with the N and H + PRP groups. Intracorporal oxidative stress and apoptotic index were significantly higher in the H group than in the N and H + PRP groups.

Conclusions

This preclinical evidence suggests that clinical trials of PRP in men with ED should be considered. PRP may play a role in ED management.

Huang YC, Wu CT, Chen MF, et al. Intracavernous Injection of Autologous Platelet-Rich Plasma Ameliorates Hyperlipidemia-Associated Erectile Dysfunction in a Rat Model. Sex Med 2021;9:100317.

The impact of smoking on male lower urinary tract symptoms (LUTS)

Lower urinary tract symptoms (LUTS) are substantially prevalent and increase with age. Research on smoking as a risk factor for LUTS has been inconclusive. The present study examined the association between smoking habits and male LUTS in a population-based study using a web-based questionnaire. We firstly screened a total of 10,000 male participants who were selected according to the age distribution in the Japanese population in government data, in order to check smoking habits. We then performed a web-based survey to further investigate factors associated with LUTS, using the Overactive Bladder Symptom Score (OABSS), International Consultation on Incontinence Questionnaire-Short Form (ICIQ-SF), and International Prostate Symptom Score (IPSS) questionnaire. Finally, 9042 participants (non-smokers, n = 3545; ex-smokers, n = 3060; and current-smokers, n = 2437) completed the full continence survey. Current-smokers (2.54 ± 2.73, 1.98 ± 3.57, 5.75 ± 7.02) and ex-smokers (2.80 ± 2.52, 1.81 ± 3.10, 6.58 ± 6.96) showed significantly higher OABSS total, ICIQ-SF total, and IPSS total scores than non-smokers (1.98 ± 2.40, 1.35 ± 2.90, 4.23 + -/6.33) (p: < 0.0001, < 0.0001, < 0.0001, respectively). In comparison to non-smokers, the prevalence of risk ratio for day-time frequency, nocturia, urgency urinary incontinence (UUI), OAB, and IPSS ≥ 8 were 1.2 1.2 1.4 1.5 1.5, respectively, in current-smokers and 1.3, 1.5, 1.5, 4.5, 1.8 in ex-smokers. The relative risk of OAB, nocturia, UUI, and IPSS ≥ 8 in ex- and current-smokers in comparison to non-smokers was high in the young age groups in comparison to the elderly groups. Current-smokers and ex-smokers showed a higher prevalence of male LUTS. This phenomenon was highly observed in relatively young age groups.

Cardiovascular risk of smoking and benefits of smoking cessation

Smoking increases mortality from all causes and has a crucial role in atherosclerotic cardiovascular disease (ASCVD). Active smoking and secondhand smoke exposure determine more than 30% of coronary heart disease (CHD) mortality. The exact mechanisms of cardiovascular damages are not well known, but the detrimental effect of smoking on endothelial function has long been recognized. Smoking elicits oxidative processes, negatively affects platelet function, fibrinolysis, inflammation and vasomotor function; all these proatherogenic effects double the 10-year risk of fatal events in smokers compared to non smokers. An intriguing issue about smoking is the vulnerability of female gender. The mortality from cardiovascular diseases (CVDs) is higher in female than male smokers and female smokers show a 25% higher risk of developing CHD than men with the same exposure to tobacco smoke. This female vulnerability seems to be related to genes involved in thrombin signaling. The effects of smoking cessation have also been extensively studied. Cessation at an early age (40 years) has an impressive 90% reduction in the excess risk of death. In this review we report recent data about the causal link between smoking and CVDs and about the benefits of smoking cessation.

The influence of smoking exposure and cessation on penile hemodynamics and corporal tissue in a rat model

Background

While epidemiological studies have clearly documented that smoking cessation significantly enhances sexual health, the underlying mechanism remains largely unknown. Thus, we wished to explore possible mechanisms by using a rat model of smoking-associated erectile dysfunction (ED).

Methods

Forty 8-week old male Sprague-Dawley rats were divided into 4 groups. Ten rats were exposed only to room air (N group). The remaining 30 rats were passively exposed to cigarette smoke over a 12-week period. At the end of 12 weeks, the smoking (S, n=10) group underwent immediate erectile function testing and were sacrificed. The remaining 20 rats were exposed to room air only for 4 (Q4W, n=10) or 8 (Q8W, n=10) weeks and then underwent erectile function testing and sacrifice. Erectile function was evaluated by measuring intracavernous pressure (ICP) and mean arterial pressure (MAP). After blood collection for serum testosterone determination, rats were sacrificed to obtain corporal tissue for immunohistochemistry.

Results

Mean ICP/MAP ratio was significantly lower in the S group compared to the N and Q8W groups (0.52±0.11, 0.94±0.05, and 0.94±0.12, respectively, P=0.0189). Smooth muscle/collagen ratio was also significantly lower in the S group compared to the N and Q8W groups (11.8±0.94, 17.5±1.82, and 16.4±0.60, respectively, P=0.0008). Oxidative stress and apoptotic indices were significantly higher in the S group compared to the N and Q8W groups. Neuronal and endothelial nitric oxide synthases were significantly less expressed in the S group compared to the N and Q8W groups.

Conclusions

Smoking cessation is associated with partial recovery of penile hemodynamics in a rat model of smoking associated ED.

Association between lower urinary tract symptoms and cigarette smoking or alcohol drinking

Background

Although there have been several studies about the relationship between alcohol or smoking and lower urinary tracts symptoms (LUTS). This study aimed to investigate the association between alcohol or smoking and severity of LUTS in men, as alcohol intake and cigarette smoking is important modifiable lifestyle factors for LUTS.

Methods

A cross-sectional analysis has been performed and a total of 86,707 participants in Korean Community Health Survey were included for final analysis. The adjusted odds ratio (OR) or coefficient with 95% confidence interval (CI) estimates were described to show the association between alcohol consumption or cigarette smoking and LUTS.

Results

Among the total subjects, 77,398 (89.3%), 7,532 (8.7%), and 1,777 (2.0%) had mild, moderate, and severe symptoms, respectively, according to International Prostate Symptom Score (IPSS) grade. Those who drank alcohol at least once per month were significantly associated with decreased risk of having the worst IPSS grade (OR: 0.80, 95% CI: 0.68 to 0.93). Those who smoked in the past but currently quitted and those who were daily smokers showed significantly increased risk of having the worst IPSS grade (past smoker, OR: 1.26, 95% CI: 1.14 to 1.39; daily smoker, OR: 1.21, 95% CI: 1.10 to 1.34). For nocturia, daily smoking showed positive effect (OR: 0.79, 95% CI: 0.75 to 0.84) whereas heavy alcohol drinking showed negative effect (OR: 1.22, 95% CI: 1.14 to 1.32)

Conclusions

Alcohol showed positive effect on LUTS except nocturia whereas cigarette smoking had negative effect on LUTS except nocturia. Daily smoking showed positive effect on nocturia whereas heavy alcohol drinking showed negative effect on nocturia.

Vitamin C supplementation during chronic variable stress exposure modulates contractile functions of testicular artery and sperm parameters in male Wistar rats

Background

Humans are exposed to identifiable multiple environmental stressors. However, there is paucity of studies assessing chronic variable stress (CVS) exposure together with antioxidant supplementation on reproductive function. This study investigates impact of vitamin C supplementation, during CVS exposure on contractile functions of testicular artery and sperm parameters. Twenty pubertal male Wistar rats (150–200 g) were grouped into four of five rats each consisting of control (normal saline), vitamin C treated (7 mg/kg bwt), chronic variable stress (CVS) + vitamin C, and CVS only. Animals were treated respectively for 8 weeks. Serum superoxide dismutase (SOD), catalase, malondialdehyde (MDA) activity, testosterone, and cortisol were assayed. Contractile responses of excised testicular artery to phenylephrine, potassium chloride, acetylcholine, and sodium nitroprusside were determined using Ugo Basile data acquisition system. Sperm parameters and histopathology of the testis were also determined. Statistical significance was taken at p < 0.05

Result

MDA activity was significantly increased in group exposed to chronic variable stress. However, groups supplemented with vitamin C during CVS exposure showed no significant increase. Serum SOD and catalase were enhanced in group exposed to CVS with vitamin C supplementation when compared to group exposed to chronic variable stress only. Chronic variable stress exposure increased serum cortisol level and this was attenuated with vitamin C supplementation. Vitamin C supplementation significantly increased serum testosterone level when compared to CVS only exposed group. Contraction responses of testicular arterial strips to phenylephrine and potassium chloride were attenuated in vitamin C supplemented groups when compared to CVS only exposed group. Vitamin C supplementation during CVS exposure also enhanced relaxation of testicular artery strip to sodium nitroprusside and acetylcholine. Sperm count and percentage motility were significantly reduced in CVS only exposed group when compared vitamin C supplemented group. Sperms cells with abnormal morphology were also significantly increased in chronic variable stress only exposed group when compared to control and vitamin C supplemented groups.

Conclusion

Chronic variable stress adversely impacts contractility of testicular artery, sperm parameters, cortisol, and testosterone level. Vitamin C supplementation modulated these by suppressing MDA and enhancing antioxidant enzyme activity.

Cigarette Smoking Is Significantly Linked to Sexual Dissatisfaction in Chinese Heroin-Dependent Patients Receiving Methadone Maintenance Treatment

Background: Cigarette smoking is associated with sexual dysfunction in the general population. Both smoking and sexual dysfunction are common in heroin-dependent patients (HDPs) receiving methadone maintenance treatment (MMT), but their association in MMT HDPs is rarely studied. This study examined the association between smoking and sexual dissatisfaction in Chinese HDPs receiving MMT. Methods: In total, 480 Chinese HDPs, who had sex with their regular or irregular sex partners within one month prior to the study, were included from three MMT clinics in Wuhan, China. Sexual dissatisfaction was assessed with one single question. Socio-demographic and clinical data and smoking characteristics were collected with a standardized questionnaire. Multiple binary logistic regression was used to analyze the association between smoking and sexual dissatisfaction, as well as the associations between levels of smoking and nicotine dependence and sexual dissatisfaction. Results: The prevalence of current smoking was 95.6% in HDPs receiving MMT. Rates of sexual dissatisfaction were higher in current smokers than non-smokers (32.9% vs. 14.3%) with a borderline significant P value of 0.074. After adjusting potential socio-demographic and clinical confounders, current smoking was significantly linked to sexual dissatisfaction (OR = 1.95, P = 0.026), and heavy smoking and severe nicotine dependence were significantly linked to sexual dissatisfaction (OR = 1.80, P = 0.025; OR = 3.27, P < 0.001). Conclusion: Smoking is significantly associated with sexual dysfunction in HDPs receiving MMT. It deserves further investigation as to whether quitting smoking can improve the sexual function of methadone-maintained patients.

Dietary Modification Is Associated with Normalization of Penile Hemodynamics in Rats Fed a High-Fat Diet

BACKGROUND

Diet is associated with self-reported indices of sexual health. The mechanisms responsible for these changes remain poorly understood.

AIM

To investigate the hemodynamic and histological impact of dietary change in a rat model of hyperlipidemia-associated erectile dysfunction.

METHODS

40 2-month old male Sprague-Dawley rats were divided into 4 groups. 10 rats were fed a diet of standard chow and served as negative controls (N group). The remaining 30 age-matched rats were divided at random into 3 groups: (i) high-fat diet for 5 months starting at age 5 months (H group); (ii) high-fat diet for 5 months starting at age 4 months followed by 1 month of standard chow (H+N1M group); and (iii) high-fat diet for 5 months starting at age 2 months followed by 3 months of standard chow (H+N3M group). All rats underwent erectile function testing and sacrifice at age 10 months.

OUTCOMES

Intracavernous pressure (ICP) and mean arterial pressure (MAP) were measured to evaluate erectile function. Blood samples were collected to measure serum testosterone and lipid levels, and penile tissue specimens were obtained for histological examination.

RESULTS

Total body weight, low-density lipoprotein, and serum glucose were significantly higher in the H group compared with the N and H+N3M groups. Serum high-density lipoprotein level was significantly lower in the H group compared with the N and H+N3M groups. The mean ICP/MAP ratio was significantly lower in the H group compared with the N and H+N3M groups (0.33 ± 0.05 vs 0.79 ± 0.07 vs 0.73 ± 0.13; P < .05 for both). Markers for intracorporal neuronal nitric oxide synthase and endothelial cells were more weakly expressed in the H group compared with the N and H+N3M groups. There was no significant difference in smooth muscle content among the groups. Mean cavernosal oxidative stress and the apoptotic index were significantly higher in the H group compared with the N and H+N3M groups. No significant between-group differences were noted with respect to serum testosterone; the H group had significantly higher serum glucose and low-density lipoprotein levels, effects that were partially mitigated in the H +N1M and H+N3M groups.

CLINICAL TRANSLATION

Administration of a healthy diet is associated with normalization of functional and histological penile defects associated with a high-fat diet.

STRENGTHS & LIMITATIONS

Metabolic changes were clearly linked to functional improvements in penile blood flow. Differences between rat and human lipoprotein metabolism are a limitation of this study.

CONCLUSION

Dietary changes may have positive effects on penile hemodynamics in a rat model of hyperlipidemia-associated erectile dysfunction. Huang Y-C, Ho D-R, Lin J-H, et al. Dietary Modification Is Associated with Normalization of Penile Hemodynamics in Rats Fed a High-Fat Diet. J Sex Med 2019;16:791-802.

Epidemiology and risk factors of lower urinary tract symptoms/benign prostatic hyperplasia and erectile dysfunction

Benign prostatic hyperplasia (BPH) is very common in aging men and causes lower urinary tract symptoms (LUTS), which decrease health-related quality of life. A number of evidence suggests that other than ageing, modifiable factors, such as increasing prostate volume, obesity, diet, dyslipidemia, hormonal imbalance, hypertension, metabolic syndrome, alcohol, and smoking, also contribute to the development of BPH and/or LUTS. More recently, erectile dysfunction (ED) has been linked to LUTS/BPH as a part of this syndrome, suggesting that patients with BPH or LUTS easily develop ED, and that LUTS/BPH symptoms often coexist with ED. This article focuses on the epidemiology and risk factors of the combined phenotype LUTS/BPH - ED.

Effects of active and passive smoking on salivary cytokines levels in rats: A pilot study

Cigarette smoking is an established risk factor for some oral diseases. As an essential fluid in the oral cavity, saliva is crucial to maintain oral health. Relative to active smoking, there are very few studies assessing the effect of passive smoking on salivary cytokines levels. In the present study, we established the rat models by the means of the intraoral cigarette smoking or whole body cigarette smoke exposure to simulate human active or passive smoking, respectively. The effects of active or passive smoking on salivary cytokines levels were assessed by using ProcartaPlex multiplex immunoassays. The results of the current study indicated that both active and passive smoking diminished the body weights of rats and increased the levels of some blood counts. Intriguingly, active smoking enhanced the salivary levels of IL-6 and IL-12 p70 and passive smoking elevated the salivary IL-6 level. Moreover, active smoking appeared to have a more prominent activation effect on the salivary IL-6 level. It was noted that active or passive smoking had no significant effect on the salivary IFN-γ level. Active or passive smoking could have potential effects on the salivary levels of some pro-inflammatory cytokines.

The emerging role of aldosterone/mineralocorticoid receptors in the pathogenesis of erectile dysfunction

PURPOSE

Aldosterone is an old hormone that has been discovered for more than fifty years. The clinical application of its receptors' inhibitors, especially spirolactone, has benifited patients for decades worldwide. In this review, we briefly summarized the molecular mechanism of aldosterone/mineralocorticoid receptors (Ald-MRs) signaling in cardiovascular diseases and its emerging role in erectile dysfunction.

METHODS

We searched PubMed, Web of Science, and Scopus for manuscripts published prior to December 2017 using key words " aldosterone " AND " erectile dysfunction " OR " cardiovascular disease " OR " mineralocorticoid receptors ". Related literature and clinical perspectives were collated, summarized and discussed in this review.

RESULTS

The increase of reactive oxygen species production, inhibition of endothelial nitric oxide synthase system, and induction of inflammation are ubiquitous in vascular endothelial cells or vascular smooth muscle cells after the activation of Ald-MRs pathway. In addition, in cardiovascular diseases with over-active Ald-MRs signaling, MRs blockade could reverse the injury and improve the prognosis. Notably, multiple studies have correlated aldosterone and MRs to the pathogenesis of erectile function, while the mechanism is largely unperfectly identified.

CONCLUSION

In conclusion, we summarize the current evidence to highlight the potential role of aldosterone in erectile dysfunction and provide critical insights into the treatment of the disease.

Prostatic vascular damage induced by cigarette smoking as a risk factor for recovery after holmium laser enucleation of the prostate (HoLEP)

Purpose

To evaluate the relationship between prostatic vessel changes induced by cigarette smoking and the perioperative outcome of holmium laser enucleation of the prostate (HoLEP).

Materials and Methods

A total of 268 postoperative patients with benign prostatic hyperplasia (BPH) were prospectively analysed in our department. They were divided into two groups (smokers and non-smokers) according to smoking history. Transrectal colour Doppler ultrasound was performed to evaluate the prostate vascular changes. Pathologically, HE staining, CD31 and CD34 were analysed in prostatic section chips. Furthermore, postoperative outcomes were determined during a 6-month follow-up period.

Results

The preoperative prostate volume was significantly decreased in smoking patients (P = 0.04). CPI was significantly lower in smoking BPH patients (P < 0.01), whereas RI was significantly increased in smokers compared with non-smokers (P < 0.01). Histological assays revealed elevated CD34 in the smoking BPH individuals presenting an increased number of microvessels. The HoLEP duration was increased in smokers. Interestingly, we identified significantly increased overactive bladder syndrome score (OABSS) and decreased Qmax in smoking individuals during the 6-month follow-up with no difference being observed preoperatively. However, no significant difference between the groups was observed for the International Prostate Symptom Score (IPSS).

Conclusions

The significantly lower CPI and higher RI values in smoking BPH patients indicated the presence of considerable vascular damage in these subjects. Moreover, cigarette smoking extended the surgical duration and prolonged the recovery period of overactive bladder (OAB) syndrome. Thus, integrated treatment should be suggested for various BPH individuals.

Urological disease and tobacco. A review for raising the awareness of urologists

CONTEXT

Smoking is the leading cause of preventable death in our community. Its relationship with urological disease is well documented.

OBJECTIVE

To present an updated review on the relationship between urological disease and tobacco consumption and the importance of involving urologists in smoking prevention.

ACQUISITION AND SYNTHESIS OF EVIDENCE

We conducted a review of current literature, primarily by searching PubMed and using as the main base the report on the consequences of smoking on health performed by the Surgeon General.

CONCLUSION

Urologists play an essential role in informing patients of the relationship between smoking and urological disease. It is the duty of every urologist to play a more active role in educating patients and promoting smoking cessation.

Modifying Risk Factors in the Management of Erectile Dysfunction: A Review

Erectile dysfunction (ED) is prevalent among men and its presence is often an indicator of systemic disease. Risk factors for ED include cardiovascular disease, hypertension, diabetes mellitus (DM), tobacco use, hyperlipidemia, hypogonadism, lower urinary tract symptoms, metabolic syndrome, and depression. Addressing the modifiable risk factors frequently improves a patient's overall health and increases lifespan. The literature suggests that smoking cessation, treatment of hyperlipidemia, and increasing physical activity will improve erectile function in many patients. How the treatment of DM, depression, and hypogonadism impacts erectile function is less clear. Clinicians need to be aware that certain antihypertensive agents can adversely impact erectile function. The treatment of men with ED needs to address the underlying risk factors to ameliorate the disease process.

Smoking habits and benign prostatic hyperplasia: A systematic review and meta-analysis of observational studies

Previous studies have warned against the promoting effects of cigarette smoking on benign prostatic hyperplasia (BPH). In contrast, some have argued that smoking confers a protective effect regarding BPH, while others have observed an aggravated effect. Thus, we performed this meta-analysis to determine whether cigarette use is associated with BPH risk.To identify articles from observational studies of relevance, a search was performed concurrent to March 21, 2016, on PubMed, Web of Science, Cochrane, EBSCO, and EMBASE databases. Random-effect model, according to the heterogeneity, was calculated to reveal the relative risks (RRs) and corresponding 95% confidence intervals (CIs).Eight articles were included in this meta-analysis, representing data for 44,100 subjects, of which 5221 (11.8%) had BPH as defined according to the criteria. Seven reports are concerned with analysis between nonsmokers and ex-smokers, in which no significant difference was observed (RR = 0.99, 95% CI 0.94-1.05). Another meta-analysis of 7 studies indicated an observable trend, but without significant difference between groups of nonsmokers and current smokers (RR = 1.17, 95% CI 0.98-1.41). Between groups of heavy (6 articles; RR = 1.02, 95% CI 0.84-1.24) and light smokers (5 articles; RR = 0.90, 95% CI 0.71-1.15), again no significant difference appears. Finally, we combined individuals as never-smokers and ever-smokers and still found no significant difference between the 2 groups of patients (RR = 1.03, 95% CI 0.92-1.15). Sensitivity analysis was displayed and confirmed the stability of the present results.Combined evidence from observational studies shows no significant association between cigarette smoking and BPH risk, either for ex-smokers or for current smokers. The trend of elevated BPH risk from smoking was observed only in current smokers compared with nonsmokers, while marginal significance was observed in comparing ever-smokers with never-smokers in operative patients with BPH.

A microdialysis method to measure in vivo hydrogen peroxide and superoxide in various rodent tissues

Reactive oxygen species (ROS) play a critical role in cell signaling and disease pathogenesis. Despite their biological importance, assessment of ROS often involves measurement of indirect byproducts or measurement of ROS from excised tissue. Herein, we describe a microdialysis technique that utilizes the Amplex Ultrared assay to directly measure hydrogen peroxide (H₂O₂) and superoxide in tissue of living, anesthetized rats and mice. We demonstrate the application of this methodology in the penis, adipose tissue, skeletal muscle, kidney, and liver. We provide data demonstrating the impact of important methodological considerations such as membrane length, perfusion rate, and time-dependence upon probe insertion. In this report, we provide a complete list of equipment, troubleshooting tips, and suggestions for implementing this technique in a new system. The data herein demonstrate the feasibility of measuring both in vivo H₂O₂ and superoxide in the extracellular environment of various rodent tissues, providing a technique with potential application to a vast array of disease states which are subject to oxidative stress.

The Effects of Adipose-Derived Stem Cells in a Rat Model of Tobacco-Associated Erectile Dysfunction

Tobacco use is associated with erectile dysfunction (ED) via a number of mechanisms including vascular injury and oxidative stress in corporal tissue. Adipose derived stem cells (ADSC) have been shown to ameliorate vascular/corporal injury and oxidative stress by releasing cytokines, growth factors and antioxidants. We assessed the therapeutic effects of intracavernous injection of ADSC in a rat model of tobacco-associated ED. Thirty male rats were used in this study. Ten rats exposed to room air only served as negative controls. The remaining 20 rats were passively exposed to cigarette smoke (CS) for 12 weeks. At the 12-week time point, ADSC were isolated from paragonadal fat in all rats. Amongst the 20 CS exposed rats, 10 each were assigned to one of the two following conditions: (i) injection of phosphate buffered saline (PBS) into the corpora cavernosa (CS+PBS); or (ii) injection of autologous ADSC in PBS into the corpora cavernosa (CS+ADSC). Negative control animals received PBS injection into the corpora cavernosa (normal rats [NR] + PBS). After injections all rats were returned to their previous air versus CS exposure state. Twenty-eight days after injection, all rats were placed in a metabolic cage for 24-hour urine collection to be testing for markers of oxidative stress. After 24-hour urine collection all 30 rats also underwent erectile function testing via intracavernous pressure (ICP) testing and were then sacrificed. Corporal tissues were obtained for histological assessment and Western blotting. Mean body weight was significantly lower in CS-exposed rats than in control animals. Mean ICP, ICP /mean arterial pressure ratio, serum nitric oxide level were significantly lower in the CS+PBS group compared to the NR+PBS and CS+ADSC groups. Urine markers for oxidative stress were significantly higher in the CS+PBS group compared to the NR+PBS and CS+ADSC groups. Mean expression of corporal nNOS and histological markers for endothelial and smooth muscle cells was significantly lower, and tissue apoptotic index significantly higher, in the CS+PBS group compared to the NR+PBS and CS+ADSC groups. Our findings confirm that chronic tobacco exposure causes ultrastructural damage to the corporal tissue and increases systemic oxidative stress states. Treatment with ADSC ameliorates these adverse effects and holds promise as a potential therapy for tobacco-related ED.

Can lifestyle modification affect men's erectile function?

Erectile dysfunction (ED) is a common condition affecting millions of men worldwide. The pathophysiology and epidemiologic links between ED and risk factors for cardiovascular disease (CVD) are well-established. Lifestyle modifications such as smoking cessation, weight reduction, dietary modification, physical activity, and psychological stress reduction have been increasingly recognized as foundational to the prevention and treatment of ED. The aim of this review is to outline behavioral choices which may increase ones risk of developing ED, to present relevant studies addressing lifestyle factors correlated with ED, and to highlight proposed mechanisms for intervention aimed at improving erectile function in men with ED. These recommendations can provide a framework for counseling patients with ED about lifestyle modification.