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*Corresponding Author: Nasser Mikhail, Endocrinology Division, Department of Medicine, Olive-View UCLA Medical Center, David Geffen-UCLA School of Medicine, Sylmar, CA, USA.
Citation: N Mikhail, V Mahabadi. (2021) Effects of COVID-19 on testicular function J. Endo and Dis; 5(1); DOI:10.31579/2640-1045/104
Copyright: © 2021 Nasser Mikhail, This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received: 25 February 2021 | Accepted: 15 March 2021 | Published: 17 March 2021
Keywords: COVID-19; fertility; male; semen; spermatogenesis; testosterone; orchitis; testes
Background: The impact of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome-coronavirus 2 (SARS-Cov-2) on testicular function is unclear.
Objective: To clarify the effects of COVID-19 on male gonadal function.
Methods: Pubmed search up to February 24, 2021. Search terms included COVID-19, testicles, testosterone, spermatogenesis, hypogonadism. Case reports, retrospective, prospective and autopsy studies are included.
Results: Prevalence of patients hospitalized with COVID-19 having scrotal pain varies from 0-19%. Orchitis and/or epididymitis were demonstrated by scrotal ultrasound (US) in approximately 22-42% of men with COVID-19 admitted to the hospital and can be frequently asymptomatic. Circulating testosterone levels are reduced in men admitted with COVID-19 with concomitant elevation of luteinizing hormone (LH) suggesting testicular dysfunction. Men affected with COVID-19 exhibit abnormal semen parameters. Most, but not all, studies failed to detect SARS-CoV-2 in semen. Autopsy studies showed extensive damage of testicular tissues of men who died from severe COVID-19.
Conclusion: COVID-19 negatively affects almost all aspects of male gonadal function. Physicians should evaluate testicular function during and after recovery from COVID-19 to preserve normal fertility.
Introduction
Many viruses such as mumps, human immunodeficiency virus (HIV), Zika virus, and others can invade the testicles [1] SARS-Cov-2 uses angiotensin converting enzyme 2 (ACE2) as receptor and the transmembrane protease serine 2 (TMPRSS2) as co-receptor for host cell binding and penetration [2]. Conflicting data exist regarding expression of these receptors in testicular tissues. Thus, some workers found that ACE2 receptors were expressed in testicular germ cells, Leydig cells, and Sertoli cells [3, 4]. In addition, ACE2 receptors and TMPR22 are expressed in prostate [5]. However, Pan et al [6] found that ACE2 and TMPRSS2 are expressed sparsely in the human testes, whereas Stanley et al [7] failed to detect co-expression of ACE2 and TMPRSS2 in testicular cells. Nevertheless, emerging data provide convincing evidence that several men affected with COVID-19 exhibit significant gonadal dysfunction. The latter is reflected by frequent presence of scrotal symptoms in COVID-19 patients, and evidence of orchitis and epididymitis by scrotal imaging. In addition, there is impairment of semen parameters in patients examined at various stages of COVD-19. Moreover, autopsy studies demonstrated extensive testicular damage in patients who died from severe COVID-19.
Testicular symptoms in patients with COVID-19
Kim et al [8] described a 42-year-old male who presented with testicular pain for 8 days and was found few days later to have COVID-19 pneumonia. Testicular exam revealed “no abnormal findings” [8]. La Marca et al [9] reported a 43-year-old man who had COVID-19 pneumonia associated with scrotal pain. Scrotal US was consistent with epididymitis [9]. In a cross-sectional study, Pan et al [6] reported that 6 out 34 (19%) men had scrotal discomfort around the time of COVID-19 confirmation. In a prospective study from Turkey of 91 men hospitalized with COVID-19, Ediz et al [10] reported that 11% of men had testicular pain. The latter was not associated with age nor with several inflammatory markers of COVID-19 [10]. On the other hand, in a retrospective study of 253 men, 81% of them had mild COVID-19, the authors did not identify any patients with scrotal complains [11].
Testicular imaging in patients with COVID-19
The first case of testicular inflammation associated with COVID-19 was reported in the pediatric population by Gagliardi et al [12] who reported a 14-year-old boy presenting with scrotal swelling and fever. Scrotal US showed orchitis and epididymitis [12]. Bridwell et al [13] described a 37-year-old man with mild asymptomatic COVID-19 pneumonia presenting with bilateral testicular pain, mild fever, and myalgia approximately 10 days after testing positive with nasopharyngeal polymerase chain reaction (NP-PCR) for COVID-19. Orchitis was confirmed by US without evidence of epididymitis [13].
In a retrospective study from Wuhan, China, Chen et al [14] performed testicular US in 142 hospitalized patients with confirmed COVID-19 and median age 58.3 years (range 24-93). They found that 32 of 142 (22.5%) of patients had evidence of acute orchitis (n=10), epididymitis (n=7), or epididymo-orchitis (n=15) [14]. The risk of scrotal infection increased with age and severity of COVID-19. Thus, prevalence reached 53% in men older than 80 years, and acute scrotal infection was more likely to occur in the group with severe COVID-19 compared to the group with non-severe disease, 35.6% and 13.5%, respectively (P=0.002) [14]. Interestingly, only 10 of the 32 (31.3%) patients with abnormal scrotal US exhibited acute scrotal symptoms. Conversely, 3 of the 110 patients (2.7%) who had negative scrotal US had acute scrotal symptoms [14]. These observations suggest that orchitis associated with COVID-19 may be asymptomatic. The latter notion might be also true with respect to epididymitis. In fact, in a small retrospective study from Brazil, Carneiro et al [15] performed testicular US in 26 young men (age range 21-42 years) hospitalized for mild to moderate COVID-19. None of patients had scrotal symptoms [15]. Using similar diagnostic criteria to study of Chen et al [15], they found that 11 patients (42.3%) had US signs of epididymitis, and no patient had signs of orchitis [15]. These findings may have important clinical applications given the important role of the epididymis in male fertility, and certainly require confirmation in larger studies including broader patient population.
Testosterone levels in patients with COVID-19
Testosterone is produced in testicles by Leydig cells and is essential in maintaining normal spermatogenesis and male fertility [16]. There is general agreement that circulating testosterone levels may be reduced in patients with COVID-19 admitted to the hospital [17-19]. Cayan et al [17] have shown that total testosterone levels significantly decreased in a subgroup of 24 Turkish men from 458 ± 198 ng/dl prior to COVID-19 infection to 315 ± 120 ng/dl on the first day of hospital admission (P=0.003). Furthermore, available data suggest that the degree of hypogonadism increases in parallel to the severity of COVID-19. Thus, in one prospective study from Turkey of young patients (mean age ± standard deviation 35.5 ± 9.8 years), Okcelik [18] showed that patients with COVID-19 pneumonia had significantly lower testosterone levels than COVID-19 patients without pneumonia, 260.3 and 435.1 ng/dl, respectively (P=0.01). In one Chinese retrospective study, Ma et al [19] compared serum levels of testosterone in 119 young men (age range 20-49 years) hospitalized for COVID-19 (84% of them had moderate disease) with 273 age-matched control subjects. They found a non-significant trend of testosterone levels to be lower in COVID-19 patients compared with control subjects, median [interquartile range, (IQR)] being 397 (314-574) and 464 (351-638) ng/dl, respectively (P=0.18) [19]. Meanwhile, luteinizing hormone (LH) values were significantly higher in patients compared with control individuals; median (IQR) 6.36 (4.63-8.38) and 3.38 (2.48-4.52) mIU/L, respectively, P < 0>
Impairment of spermatogenesis in men with COVID-19
In an Italian prospective study, Gacci et al [21] examined semen parameters in 43 patients who recovered from COVID-19 after 2 consecutive negative nasopharyngeal swabs for SARS-CoV-2 RNA (median time from the first positive to second consecutive negative test was 31 days, range 3-65 days). They found that 8 patients (18.6%) had azoospermia, and 3 (7.0%) patients had oligospermia (< 2 n=2) n=18) n=14).>
Presence of SARS-CoV-2 in the semen
Available data suggest that detection of SARS-CoV-2 in semen is rare. Li et al [25] detected SAR-CoV-2 virus RNA in the semen of 4 out of 15 acutely ill and 2 out of 23 men recovering from COVID-19. Among 43 men who recovered from COVID-19, Gacci et al [21] detected SARS-CoV-2 in semen of only one patient in whom semen sample was collected 21 days after the second negative nasopharyngeal swab. Importantly, his partner did not test positive for SARS-CoV-2 [21]. Meanwhile, 14 studies (n=299), including 2 studies that described men with orchitis-like symptoms, failed to demonstrate SARS-CoV-2 in seminal fluid among patients affected with various stages of COVID-19 [26].
Autopsy studies
Postmortem examination of testicles of patients who died from COVID-19 can shed light on direct impact of severe COVID-19 on gonadal function. Results of the autopsy studies, summarized in table 1, are variable due to differences in patients’ characteristics, timing of death after COVID-19 infection and methodological issues. Most autopsy studies showed severe injury of seminiferous tubules, germ cells, Leydig cells, and variable degrees of apoptosis and interstitial cellular infiltration of inflammatory cells. Two studies showed that Sertoli cells were spared [27, 29]. On the contrary Yang et al [30] described severe injury of Sertoli cells. Interestingly, while viral particles were not identified in most studies, Ma et al [27] have detected viral particles in all testicular autopsies examined (n=5). In a proteomic (i.e protein quantification) autopsy study including samples from 5 patients who died from COVID-19 pneumonia, Nie et al [31] found reduced Leydig cells and sperm motility factor. In addition, there was evidence of reduced testicular biosynthesis of cholesterol, the source of testosterone [31].
Clinical implications
The above results have 2 major implications. First, since orchitis and/or epididymitis, both symptomatic and asymptomatic, are not uncommon among patients hospitalized with COVID-19, it is essential for physicians to elicit history regarding any scrotal complaints [14]. In case of any suspicion of scrotal infection, we recommend performing a scrotal US for further evaluation. If the frequent occurrence of asymptomatic cases of orchitis and/or epididymitis is replicated in future studies, scrotal US should be considered in all men hospitalized for COVID-19. Second, the demonstration of hypogonadism and impairment of spermatogenesis in men hospitalized with COVID-19 implies that measurement of serum testosterone and semen analysis should be repeated after recovery to rule out any persistent abnormalities that may compromise fertility. This evaluation is particularly important in patients in reproductive age who wish to have biological children.
Increasing evidence suggest that the testicles may be among the main targets of SARS-CoV-2. COVID-19 may be associated with multiple abnormalities relevant to male gonadal function. These include the common occurrence of scrotal pain, evidence of orchitis and epididymitis, sex-hormone defects consistent with testicular failure (i.e. hypergonadotropic hypogonadism), and impairment of spermatogenesis. Furthermore, autopsy studies showing degeneration of germ cells, and inflammatory cell infiltration represent direct evidence of testicular involvement in patients who died from severe COVID-19. Meanwhile, the available studies suffer from several limitations such as inclusion of small number of subjects and unavailability of patients’ medical tests prior to COVID-19 infection for comparison (e.g. testosterone levels and semen analysis). In addition, none of the available studies performed regular follow-up of abnormal investigations from the time of start of acute COVID-19 infection until recovery and thereafter. The demonstration of SARS-CoV-2 in few semen specimens of COVID-19 patients, although uncommon, is somewhat disturbing. Nevertheless, it is unknown whether SARS-CoV-2 viral particles detected in semen are still infective, and if so, at what stage of the disease. While there is no current evidence that COVID-19 is sexually transmitted, caution should be exercised when managing the semen of patients recovering from COVID-19 for purposes of assisted reproduction and cryopreservation until definitive evidence is established.
Conflict of interest
The authors do not have conflicts of interest to declare.
Abbreviations
COVID-19: coronavirus disease 2019
SARS-CoV-2: severe acute respiratory syndrome coronavirus 2
ACE2; angiotensin-converting enzyme
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