Impact of human papillomavirus infection on semen parameters and reproductive outcomes

Assisted reproductive technology treatment failure and the detection of intrauterine HPV through spent embryo transfer media sample

Cervical human papillomavirus (HPV) infection is believed to increase the risks of pregnancy failure and abortion, however, whether the uterine cavity HPV infection reduces pregnancy rate or increases miscarriage rate remains unclarified in infertile women undergoing assisted reproductive technology (ART) treatment. Therefore, we aimed to assess ART outcomes in the presence of intrauterine HPV. This was a hospital-based multicenter (five reproductive medicine centers) matched cohort study. This study involved 4153 infertile women undergoing in vitro fertilization (IVF) or intracytoplasmic sperm injection treatment in five reproductive medicine centers between October 2018 and 2020. The spent embryo transfer media sample with endometrium tissue were collected and performed with flow-through hybridization and gene chips to detect HPV DNA. According to basic characteristics, HPV-positive and negative patients were matched in a ratio of 1:4 by age, body mass index transfer timing, transfer type, and number of embryos transferred. The primary outcome was pregnancy and clinical miscarriage rates in the transfer cycle underwent HPV detection. 92 HPV-positive and 368 HPV-negative patients were screened and analyzed statistically. Univariate analysis showed uterine cavity HPV infection resulted in lower rates of ongoing pregnancy (31.5% vs. 44.6%; p = 0.023), implantation (32.3% vs. 43.1%; p = 0.026), biochemical pregnancy (47.8% vs. 62.5%; p = 0.010), and clinical pregnancy (40.2% vs. 54.3%; p = 0.015) compared with HPV negative group. The infertile female with positive HPV also had a slightly higher frequency of biochemical miscarriage (15.9% vs. 13.0%; p = 0.610) and clinical miscarriage (24.3% vs. 15.5%; p = 0.188). These findings suggest that HPV infection in the uterine cavity is a high risk for ART failure. HPV screening is recommended before ART treatment, which may be benefit to improving pregnancy outcome.

Seminal human papillomavirus infection: a narrative review

BACKGROUND

Human papillomavirus (HPV) infection is one of the most prevalent sexually transmitted infections that can lead to malignant pathologies as well as fertility problems. The aim of this study was to evaluate the prevalence of HPV infection in males, its impact on semen parameters, and reproductive consequences. We also evaluated potential measures that could prevent negative outcomes of HPV infection in males.

METHODS

A systematic literature search using PubMed/Medline and Embase databases was performed to search for English articles published until July 2023. We explored three different aspects: (1) prevalence of HPV semen infection and its impact on seminal parameters; (2) the relationship between HPV semen infection and infertility risk and reproductive outcomes; and (3) potential measures that could prevent the negative outcomes related to HPV seminal infection. The identified studies were first screened and assessed independently by one author, and then validated by two additional authors. Data were extracted from 19 studies.

RESULTS

The prevalence of seminal HPV infection was higher among infertile males. In addition to controversies about the real interference of seminal HPV infection on sperm parameters, a growing number of studies have demonstrated a correlation between unexplained infertility and seminal HPV infection. Semen HPV infection is also associated with lower rates of pregnancy and higher rates of miscarriage. Prevention measures such as HPV vaccination seem promising.

CONCLUSION

Further studies are required to confirm not only the association between HPV infection and reproductive outcomes but also the benefit of preventive measures.

Are sexually transmitted infections associated with male infertility? A systematic review and in-depth evaluation of the evidence and mechanisms of action of 11 pathogens

Purpose

To systematically review the evidence on the association between sexually transmitted infections (STIs) and male infertility. We sought to answer two questions: Are STIs significantly associated with detrimental changes in semen parameters?; and, is the prevalence of STIs significantly higher in infertile than fertile men?

Materials and methods

PubMed, Scopus and Google Scholar databases were searched (inceptionMarch 2023) following the PRISMA guidelines. Identified original studies in English on the association between STIs and male infertility were included. Data was tabulated/described by pathogen, mechanisms of action, number of studies and their level of evidence.

Results

Seventy out of 903 originally retrieved articles were included in this review. For the detrimental changes in semen parameters (first question), the evidence seems equivocal based on the nearly equal number of studies and similar levels of evidence. The only exception was for Ureaplasma, where the number of studies and levels of evidence supported an association with male infertility. Pertaining to a significantly higher prevalence of STI among infertile compared to fertile men (second question), evidence was insufficient to support/deny a significant association. The two exceptions were Ureaplasma and Mycoplasma, where the number of studies and evidence levels were in favour of an association with male infertility.

Conclusions

Generally, the relationship between STIs and male infertility remains to be uncovered. Our appraisal of the overall state of this relationship shows that the evidence base leaves much to be desired. The exceptions are Ureaplasma and Mycoplasma, where the evidence convincingly suggests their associations with infertility in men.

Evaluation and management of male genital tract infections in the setting of male infertility: an updated review

PURPOSE OF REVIEW

Male infertility may be secondary to male genital tract infection (MGTI) in an estimated 15% of cases. In the absence of overt clinical signs, evaluation for MGTI beyond semen analysis is not well established. Therefore, we review the literature on the evaluation and management of MGTI in the setting of male infertility.

RECENT FINDINGS

A set of international guidelines recommends semen culture and PCR testing, but the significance of positive results remains unclear. Clinical trials evaluating anti-inflammatory or antibiotic treatment report improvements in sperm parameters and leukocytospermia, but data on the effect on conception rates are lacking. Human papillomavirus (HPV) and the novel coronavirus (SARS-CoV-2) have been associated with poor semen parameters and decreased conception rates.

SUMMARY

The finding of leukocytospermia on semen analysis prompts further evaluation for MGTI, including focused physical examination. The role of routine semen culture is controversial. Treatment options include anti-inflammatories; frequent ejaculation; and antibiotics, which should not be used in the absence of symptoms or microbiological infection. SARS-CoV-2 represents a subacute threat to fertility that should be screened for in the reproductive history along with HPV and other viruses.

Sperm human papillomavirus infection and risk of idiopathic recurrent pregnancy loss: insights from a multicenter case-control study

OBJECTIVE

To test the hypothesis claiming an association between human papilloma virus (HPV) sperm infection and idiopathic recurrent pregnancy loss (RPL).

DESIGN

Multicenter retrospective case-control study.

SETTING

Three university hospitals.

PATIENT(S)

Cases included men belonging to couples affected by first trimester idiopathic RPL. Controls included men belonging to couples with proven fertility and no history of pregnancy loss; RPL was defined as the previous loss of 2 or more pregnancies. Couples were defined as "fertile" if they achieved a full-term pregnancy within the year before enrollment in the study. All participants conceived without assistance.

MAIN OUTCOME MEASURE(S)

The association between HPV DNA sperm infection, as identified using polymerase chain reaction, and RPL.

RESULTS

The HPV DNA sperm infection was detected in 23 of 117 cases (20%; 95% confidence interval [CI]: 13%, 28%) and in 3 of 84 controls (4%; 95% CI; 1%, 10%) (P<.001). A comparison across baseline characteristics and multiple regression analysis did not identify any potentially confounding factors. Multivariate regression models showed a significant association between HPV DNA sperm infection and RPL (adjusted odds ratio, 7.44; 95% CI: 2.08, 26.58; P=.002 [Model 1]; adjusted odds ratio, 8.96; 95% CI: 2.41, 33.44; P=.001 [Model 2]).

CONCLUSIONS

The prevalence of HPV sperm infection was significantly higher in couples affected by RPL than in their fertile counterparts. Notably, the semen sample was infected by HPV in approximately 1 out of 5 patients.

Effects of Ureaplasma urealyticum infection on semen quality and sperm morphology

INTRODUCTION

Ureaplasma urealyticum (U. urealyticum) infection is primarily associated with damage to male fertility through its effects on male sperm parameters. However, its effects on sperm semiological variables remain unclear. Therefore, this study aimed to investigate whether U. urealyticum infection was associated with semen quality and sperm morphology.

METHODS

From 2019 to 2021, this cross-sectional study analyzed infective pathogens and semen variables in 1064 males (22-30 years old) recruited from our reproductive center and the general public. Routine semen parameters and normal sperm morphology rate were analyzed using methods outlined by the World Health Organization. The associations between semen quality, sperm morphology, and U. urealyticum infection were studied using general linear models.

RESULTS

The participants were categorized into three groups: (i) U. urealyticum infection (n=328), (ii) non-U. urealyticum infection (including males with urogenital tract infection symptoms but no U. urealyticum detected in their semen samples, n=377), and (iii) normal volunteers (males without symptoms of urogenital tract infection and no pathogens detected in semen samples, n=359). U. urealyticum in semen samples was observed to be associated with lower sperm concentrations (p<0.001) and a lower ratio of anterograde motile spermatozoa (p<0.001). Semen cultures positive for U. urealyticum were associated with lower normal sperm morphology (p<0.001) compared to semen cultures negative for U. urealyticum.

CONCLUSION

This study shows the importance of proper investigations for U. urealyticum during routine clinical examinations and diagnoses of males with infertility.

Intra Uterine Insemination in Two Couples with HPV Detection by Hyaluronidase-Based Swim-up Washing: Cases Report

Human papillomavirus (HPV) infection is the most common sexually transmitted disease worldwide and is associated with negative reproductive outcomes because of which it is recommended to postpone medically assisted reproduction (MAR). This raises major concerns for elder infertile couples. We showed that a hyaluronidase-based sperm washing (IALu) procedure blunted the HPV viral load in semen. Here, were report two cases of couples with long-term idiopathic infertility, ascribed to persistent semen HPV detection, finding a beneficial outcome from the use of IALu protocol applied to intra-uterine insemination (IUI). Case 1: A Caucasian couple (female aged 32, male aged 35), complained of having been attempting pregnancy for 4 years. HPV-DNA (genotypes 51 and 54) was detected on sperms. After a first unsuccessful IUI cycle attempt, using standard swim-up selection of spermatozoa, a second IUI cycle using the IALu procedure was associated with a pregnancy and a successful trimester of gestation. Case 2: A Caucasian couple (female aged 43, male aged 52) complained of having been attempting pregnancy for 3 years and showed the detection of HPV-DNA (genotype 66) on sperms. After a first unsuccessful standard IUI cycle attempt, two further IUI cycles using IALu procedure were pursued. The last cycle was associated with a pregnancy and a successful trimester of gestation. Although preliminary, the IALu procedure is a promising approach for straightforward fertility treatments in cases of recurrent HPV-DNA semen detection, avoiding critical latencies.

Prevalence of Human Papillomavirus Infection in the Female Partner of Infertile Couples Undergoing IVF/ICSI-ET and Subsequent Reproductive Outcomes

We investigated the prevalence of human papillomavirus (HPV) infection in the female partner of infertile couples and the reproductive outcomes after in vitro fertilization/intracytoplasmic sperm injection-embryo transfer (IVF/ICSI-ET). We conducted a retrospective analysis on 8117 women from infertile couples who underwent IVF/ICSI treatment and evaluated the prevalence of HPV infection in these women. The prevalence of HPV infection in the female partner of infertile couples was 9.2% (747/8117). These HPV-infected female patients undergoing ART were divided into high-risk HPV (hrHPV) (n = 130) and low-risk HPV (lrHPV) groups (n = 94), and non-infected women patients formed the negative group (n = 126). Of the 747 cases infected with HPV, 529 showed hrHPV infection (70.82%; primarily genotypes 16, 52, 53, 58, and 59); 175 exhibited lrHPV infection (23.43%; primarily genotypes 6, 43, 44, 55, 61, and 81); and 43 cases were co-infected with hrHPV and lrHPV (5.76%). Except for the Day-3 high-quality embryo rate, there were no differences in ovum maturation, fertilization, implantation, clinical pregnancy, live birth, or miscarriage rates between women infected with HPV and non-infected women (p > 0.05); however, we noted an increased miscarriage rate after logistic regression analyses (OR, 0.16; 95% CI, 0.03−0.84; p = 0.041). For single-male-factor-induced infertility in couples (smHPV), although we likewise observed no differences in ovum maturation, fertilization, or implantation rates (p > 0.05) between the smHPV group and the negative group, we discerned diminutions in the Day-3 high-quality embryo rate (46.01% vs. 70.04%, p = 0.013), clinical pregnancy rate (46.67% vs. 57.94%, p = 0.003), and live birth rate (33.33% vs. 46.83%, p = 0.027) as well as an augmented miscarriage rate (11.11% vs. 4.76%, p = 0.003), respectively. Logistic regression analyses indicated that smHPV was a risk factor for decreased clinical pregnancy rate (OR, 4.17; 95% CI, 2.31−7.53; p < 0.001) and live birth rate (OR, 1.83; 95% CI, 0.81−2.14; p = 0.045) and elevated miscarriage rate (OR, 6.83; 95% CI, 2.22−21.00; p = 0.001). HPV infection in women was associated with increased miscarriage rate, and single-male-factor infertility influenced reproductive outcomes in couples undergoing IVF/ICSI treatment. Both were potentially due to HPV infection in the couple.

Human Papillomavirus (HPV) Infection and Its Impact on Male Infertility

Nowadays, the striking numbers of infertile couples that turn to assisted reproductive technologies (ART) drive the research toward a more comprehensive understanding of the underlying causes. Male factors contribute to the inability to conceive in half of the cases, and it has been suggested that sexually transmitted infections could have a role in the onset of spermatozoa impairments. Since the impact of HPV infection on sperm quality and sperm DNA integrity is debated, we wanted to analyze its impact on conventional seminal parameters and the sperm DNA fragmentation index (DFI). Therefore, 117 semen samples of patients undergoing IVF were evaluated for the following characteristics: HPV DNA detection and sperm DNA fragmentation, concentration, motility, and morphology. The results showed a higher rate of HPV-negative patients (59.8% vs. 40.2%) and no HPV-related effect on DFI, sperm concentration, total sperm number, and total motility. Only progressive motility and morphology were found as significantly influenced by HPV positivity. Moreover, we observed a statistically significant difference in DFI when comparing high-risk HPV (HR-HPV) and low-risk HPV (LR-HPV) genotypes. Our data suggest that the presence of any HPV type, whatever the exact localization of the virions, can impair some sperm parameters, while HR-HPVs specifically affect the integrity of spermatozoa DNA.