Determination of antisperm antibodies in serum samples by means of enzyme-linked immunosorbent assay--a procedure to be recommended during infertility investigation?

Amelioration of sperm immobilisation factor-induced infertility by bacterial antigenic determinants cross-reacting with spermatozoa

A strain of Staphylococcus aureus, capable of invitro immobilisation of human and mouse spermatozoa, was already present in our laboratory. Therefore, in the present study, the factor responsible (sperm immobilisation factor, SIF) was isolated and purified. It was found to compromise not only motility, but also viability, morphology and Mg2+-ATPase activity of mouse spermatozoa. Also, SIF (250μgmL−1), when administered intravaginally in female BALB/c mice before mating, showed 100% contraceptive effect. Moreover, fluorescein isothiocyanate-labelled SIF was also found to bind mouse spermatozoa and various motile as well as non-motile bacteria, indicating the presence of common SIF-binding receptors on spermatozoa and bacteria. Further, to demonstrate molecular mimicry, the amelioration of SIF-induced impairment of sperm function by a SIF-binding bacterial receptor was compelling. For this, the SIF-binding receptor from Escherichia coli (E-SBR) was purified and evaluated for its ameliorative effect on SIF-induced sperm impairment invitro and invivo. Interestingly, upon the addition of mouse spermatozoa to SIF pre-incubated with E-SBR, an ameliorative effect against SIF-induced impairment of sperm function could be observed through analysis of normal sperm parameters (motility, viability, morphology, Mg2+-dependent ATPase levels). E-SBR also blocked binding of labelled SIF to spermatozoa and bacteria and alleviated SIF-induced infertility in female BALB/c mice. This provided evidence for molecular similarities between bacteria and spermatozoa, owing to which anti-bacterial antibodies cross-reacting with spermatozoa might be produced and infertility might follow.

Antichlamydial and Antisperm Antibodies in Patients with Chlamydial Infections

PROBLEM

Establishing the correlation between antichlamydial antibodies (AchAbs) and antisperm antibodies (ASA) in patients with chlamydial infections.

METHOD OF STUDY

ASA were studied in sera from patients (142 with genital, 57 with ocular chlamydial infections) and control group (n = 100) by gelatin and tray agglutination test (TAT), sperm immobilization test (SIT) and ELISA. AchAbs were revealed by ELISA.

RESULTS

A significantly higher (P < 0.05) ASA incidence was noted in patients with genital infections as compared with controls and patients with ophthalmologic infection (P < 0.0001), but not between patients with ophthalmologic infection and controls (P > 0.05). A significant correlation was established between AchAbs and ASA for TAT (r = 0.8214, P = 0.0341), SIT (r = 0.797, P = 0.032) and ELISA (r = 0.8519, P = 0.0313) in patients with genital infections only.

CONCLUSIONS

The genital Chlamydia infection may play a role in the induction of ASA. This is probably a result of the inflammatory process, but not of cross-reactivity between sperm and Chlamydia trachomatis antigens.

Immune response of the tammar wallaby (Macropus eugenii) to sperm antigens

In the present study, male and female tammar wallabies were immunised with whole tammar wallaby sperm in adjuvant. An assay for sperm antibodies using a live sperm ELISA has been developed to detect sperm surface antigens and used to validate an assay using a 3-[(3-cholamidopropyl) dimethylammonio]-1 propanesulfonate (CHAPS) membrane extract of whole tammar wallaby sperm. The tests were used to monitor the immune response to whole sperm in both male and female tammar wallabies. Antisera with a limited array of specificities were generated, with those locating to the midpiece region of the sperm appearing the most likely candidates for targets for fertility perturbation based on immunofluorescence of fixed and non-fixed sperm. These systemically generated antibodies were demonstrated to have access to both the female and male tammar reproductive tracts and were found on ejaculated sperm and antibodies from female sera and follicular fluid-labelled fresh ejaculated sperm from non-immunised males. Preliminary sequencing of these proteins has identified some possibilities for further investigation.

Serum sperm antibodies are not elevated after mumps orchitis

OBJECTIVE

To assess the level of serum sperm antibodies after mumps orchitis.

DESIGN

Controlled descriptive study.

SETTING

Academic research environment.

PATIENT(S)

Seventy-four mumps orchitis patients.

INTERVENTION(S)

Sampling of serum at different intervals after the onset of orchitis symptoms: 1 to 7 days, 31 to 60 days, and 61 to 431 days.

MAIN OUTCOME MEASURE(S)

Level of serum sperm antibodies, using Kibrick's gelatin agglutination test, Friberg's tray agglutination test, Isojima's sperm immobilization test, and ELISA.

RESULT(S)

Clinically relevant sperm antibody values were detected by the Friberg method among patients tested from 1 to 7 days (10.5%) and 61 to 431 days (10.5%) after the onset of disease. The Isojima test revealed a statistically insignificant higher incidence among patients at 61 to 431 days (31.6%) as compared with those sampled at 1 to 7 days (10.5%). None of the orchitis sera tested positive by the Kibrick and ELISA techniques. The established incidences did not differ significantly from the results for negative controls (blood donors) and were lower than the values acquired from positive controls (males with unexplained infertility).

CONCLUSION(S)

Mumps orchitis does not cause enhanced humoral immunity to spermatozoa.

Antisperm antibodies: etiology, pathogenesis, diagnosis, and treatment

OBJECTIVE

To critically review the English-language literature and describe the current diagnosis, prevalence, etiology, and treatment of antisperm antibodies (ASA).

DESIGN

A comprehensive literature search of the English-language literature published between 1966 and December 1997 was performed on MEDLINE. Articles were also located via bibliographies of published works.

RESULT(S)

Data were excerpted from articles identified by MEDLINE search. The diagnosis, prevalence, etiology, and treatment of ASA are described.

CONCLUSION(S)

There is sufficient evidence that ASA impair fertility in couples with unexplained infertility. A number of different methodologies are available, which may be used in their detection. However, in many cases, test interpretation is subjective. Although there is not enough evidence to support systemic treatment for ASA, application of a variety of assisted reproductive technologies improves outcome.

Antisperm antibodies and microorganisms in genital secretions--a clinically significant relationship?

In asymptomatic infertility patients, no significant relationship was found between the presence of antisperm antibodies (ASA) in serum and in semen samples (IgG and/or IgA ASA), differentiated with the mixed antiglobulin reaction (MAR), and the microbial colonization of ejaculates covering a broad spectrum of microorganisms. Likewise, there was no significant association of ASA with microbial findings in patients' female partners, who also presented without symptoms of genital tract infection and were screened at the same time. Furthermore, ASA in semen (IgG and IgA) were not significantly related to several potential markers of subclinical male sexual gland infection or inflammation (leukocytes, PMN elastase, albumin, C3c) evaluated in aliquots of the same ejaculates used for immunological testing.

Characteristics of men and women with circulating antisperm antibodies in a combined infertility clinic in Kuwait

Antisperm antibodies were determined in the sera of 250 infertile couples and 100 puerperal women as controls using the immunofluorescence technique. Couples with significant circulating antisperm antibodies were placed on low-dose prednisolone 5 mg daily for 3-6 months. Initial routine semen analysis and hypoosmotic swelling test were done and repeated after 3 months of therapy. The incidence of antisperm antibodies (ASA) was 18.8 and 17.6% in the men and women, respectively, compared to 4% in the women controls (p < .02). In the men, the main determinants (with incidence) of ASA included smoking (33.9%), past history of sexually transmitted disease (33.3%), surgery to genital tract (28.6%), trauma (27.3%), and unexplained infertility (18.5%). In women whose husbands had antisperm antibodies the incidence of circulating antisperm antibodies was 38.3%, while endometriosis and thyroid dysfunction had incidence of antisperm antibodies of 21.4 and 16.7%, respectively. In the 27 (10.8%) case of unexplained infertility, the incidence of antisperm antibodies was 22.2%. High follicle-stimulating hormone (FSH) in the men and low midluteal-phase progesterone in the women were associated with increased expression of antisperm antibodies. Antisperm antibodies adversely affected quality of sperm. Low-dose prednisolone significantly reduced the titer of antisperm antibodies and improved the sperm parameters and conception rate.

Characterization of human sperm antigens reacting with antisperm antibodies from autologous sera and seminal plasma in a fertile population

Immunoblotting techniques were used to characterize the reactivity of human sperm antigens with antisperm antibodies from a population of fertile individuals. In particular, sperm antigens of each subject were tested with the same subject's antisperm antibodies present in blood serum and seminal plasma in an attempt to construct a preliminary map of the antigen domains of the normal spermatozoon. Fifty-five fertile males, comprising 22 subjects with a pregnant partner and 33 subjects attending assisted reproductive technology sessions for proven partner's infertility and with normal semen quality entered the study. A high proportion of sera (82%) and seminal plasma (62%) showed antisperm antibodies reacting with one or more sperm antigens. Specific immunoreactivity was often demonstrated to 45-kDa, 50-kDa, 55-kDa, 69-kDa, 72-kDa and 85-kDa proteins in serum and to 59-kDa and 72-kDa proteins in seminal plasma. These proteins are the most frequently involved sperm antigens in the immune responses in fertile subjects. Further studies in an infertile population are necessary to distinguish between these antigens of minor relevance in sperm function from others significantly involved in immunological infertility.