Chlamydia trachomatis spermatozoon T. Cai, S. Mazzoli , D. Bani

Transcription

Chlamydia trachomatis spermatozoon T. Cai, S. Mazzoli , D. Bani
CASE REPORT
Journal of Andrological Sciences 2009;16:130-132
Chlamydia trachomatis attacks young male
spermatozoon
T. Cai, S. Mazzoli*, D. Bani**, T. Sacchi Bani**, R. Bartoletti
Department of Urology, University of Florence, Italy; * STDs Centre, Santa Maria Annunziata Hospital, Florence, Italy;
**
Department of Anatomy, Histology & Forensic Medicine, University of Florence, Italy
Summary
Chlamydia trachomatis infection, even if has a potential role in chronic
prostatitis pathogenesis, has a controversial impact on male fertility. The
role of Chlamydia trachomatis infections of the upper male genital tract as
probable aetiological factors for male infertility has been fully argued, without
any convincing demonstration of a clear correlation. In this case report, an
electron transmission microscopic evaluation of spermatozoa obtained from
a patients with chronic prostatitis due to Chlamydia trachomatis infection
has been showed. In this case, we stress the role of Chlamydia trachomatis
infection in young males, highlighting the role of Chlamydia trachomatis in
spermatozoa damaging and fertility decreasing.
Key words
Chlamydia trachomatis • Spermatozoa •
Fertility • Prostatitis
Introduction
Chlamydia trachomatis (C. trachomatis) is the most prevalent bacterial
cause of sexually transmitted infections1. Moreover, World Health Organization estimates that more than 92 million of C. trachomatis infections occurred worldwide in the last years 1. This high diffusion is probably due also to the fact that approximately 75% of C. trachomatis infections in women and up to 50% of those in men are asymptomatic and
this is why, due to the low reported incidence rates of genital chlamydial
infections in the population 2. Recent reports have established that C.
trachomatis causes symptomatic infection in the lower male genital
tract and that should have a potential role in chronic prostatitis pathogenesis 3. Furthermore, we recently showed a clear correlation between
poor semen quality and C. trachomatis infections in young male patients
affected by chronic prostatitis due to C. trachomatis infection4. Even if
the pathophysiology of C. trachomatis infection damage on human fertility is also unclear for the moment, few hypotheses have been, recently,
purposed 5-6. Some Authors state that C. trachomatis could directly
damage male sperm5 while others suggested a probable immuno-mediated damage. In fact, the presence of anti-chlamydial immunoglobulin
(Ig) A in semen from males with a previous contact with C. trachomatis
is associated with elevated levels of T lymphocytes, that have been also
correlated with the presence of antisperm antibodies 6. In our previous
study, we have found a statistically significant differences between patients affected by C. trachomatis infection and those with uropathogens
Corresponding author:
Tommaso Cai, Department of Urology, University of Florence, via dell’Antella 58, 50011 Florence, Italy – Tel. +39 0552496347 – Fax +39 0552496452 – E-mail:
[email protected]
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Chlamydia trachomatis attacks young male spermatozoon
infections in terms of sperm concentration, percentage of motile sperm and that of normal morphological
forms, highlithing the probable direct damage of C.
trachomatis against spermatozoa 4. In addition, we
have found a strong correlation between positivity
to Heat Shock Protein 60, 70 and sperm concentration and normal morphological forms, highlighting the
immuno-mediated damage too 4. Recently, the use
of electron microscopy in the study of male affected
by C. trachomatis infections has been improved, due
to the extreme small size of this microrganisms. We
present, here, a case of a 30-year-old patient affected
by chronic prostatitis, positive to C. trachomatis infection markers, in which an electron transmission microscopic evaluation has been performed.
Case report
A 30-year-old patient affected by clinically demonstrated chronic prostatitis underwent Meares-Stamey
test, performed according to European Association
of Urology (EAU) guidelines by using a 4-glass test 7.
All genital samples were collected, in accordance
with indications described in our previous report 8.
All biological samples was analysed for the detection
of Chlamydia trachomatis (CT), urogenital Mycoplasmata, Neisseria gonorrhoeae, Human Papilloma virus,
Herpes virus 1 and 2 by PCR (Polymerase Chain Reaction) and aerobic, anaerobic and microaerophylic
common bacteria and yeasts by culture 8. The patient
showed positivity both for CT plasmidic DNA and
mucosal IgA in total ejaculate, while was negative for
all the other tests. In order to perform the electron
microscopy analysis, sperm sample has been fixed
in Karnovsky’s reagent, rinsed overnight in 0.1 mol/L
cacodylate buffer (pH 7.2), postfixed in 1% buffered
OsO4, dehydrated, and embedded in Epon-Araldite
(Fluka, Milan, Italy). Ultrathin sections were cut with
an LKB ultramicrotome (Vienna, Austria) and stained
with uranyl acetate and lead citrate. Observations
were made with a TEM CM 10 (Philips, Eindhoven,
the Netherlands), at magnifications of x 7,500, by a
dedicated evaluator. The Figure 1 shows a C. trachomatis elementary body (EB) (arrow) attached to the
thin cytoplasmic layer of a spermatozoon (diameter
0.1 µm), while the Figure 2 shows Chlamydia forms
free in the seminal fluid from the same patient, especially reticulary bodies (RB) and EB, that should
be the infecting form of C. trachomatis. The patients
underwent standard antibiotic therapy for C. trachomatis infections, in accordance with EAU guidelines
(doxycycline 2 times daily 100 mg orally for 21 days) 7.
At the follow-up visit, the patient showed improvement in symptoms relief and quality of life and, then,
Figure 1. C. trachomatis elementary body (arrow) attached to
the thin cytoplasmic layer of a spermatozoon (diameter 0.1 µm).
Electron microscopy photo. Original magnification x 7,500.
Figure 2. C. trachomatis forms free in the seminal fluid, elementary bodies and reticulary body. Electron microscopy photo. Original magnification x 7,500.
underwent microbiological analyses that confirmed
the absence of C. trachomatis infection.
Discussion
Chlamydia trachomatis, an obligate intracellular parasite, has a biphasic life cycle characterized by an EB
with infective capacity and a reticular body RB that
is able to replicate within eukaryotic cells 9. In details,
the organism has a unique developmental cycle in
which it exists in two alternating forms: an extracellular, metabolically inactive, infectious form, EB and
an intracellular, metabolically active, reproducing form,
RB. This developmental cycle is necessary because C.
trachomatis need to utilize the intracellular machinery of
a host cell in order to reproduce 10. An obvious consequence of this developmental cycle is that, at the site of
infection, the reproductive tract will periodically contain
significant numbers of highly infectious EB, and these
may be encountered by any gametes that are present
in the reproductive tract at that time 10. Hosseinzadeh
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T. Cai, et al.
and co-workers have, recently, demonstrated that EB
can have a direct and negative effect on sperm physiology and this was seen primarily via a reduction in
sperm motility, which was reflected in a corresponding
increase in sperm death 11. The same group, have also
demonstrated that Ct-induced death of human sperm
is primarily caused by lipopolysaccharide (LPS) 10,
by means of a caspase-mediated apoptosis 12. LPS
is, then, a heat-stable complex and unique glycolipid that is present in all Gram-negative bacteria. It is
the immunodominant antigen of most Gram-negative
bacteria and is considered to be intimately associated
with the virulence of the pathogen 13. C. trachomatis
LPS is known to be particularly spermicidal 10 and is
composed of a simple structure containing lipid A and
Kdo 14. In particular, C. trachomatis LPS interacts with
CD14 on the sperm surface (and, possibly, Toll-like
receptors if present), leading to increased production of
reactive oxygen species, resulting in caspase-mediated
apoptosis 5. Excessive generation of reactive oxygen
species is related to an increase in sperm defects both
in vitro and in infertile men 15. Several studies showed
that in vivo model, C. trachomatis were phagocytized
and killed by polimorphonucler leukocytes and macrophages 16. However, C. trachomatis can resists in polimorphonucler leukocytes and macrophages inclusion
as intact form, promoting the establishment of latent or
chronic infections states and circumvents bactericidal
immune mechanisms and selective drug therapy 16.
This characteristic may act as a factor for dissemination
of C. trachomatis infections to the female partners. The
ability to cause persistent infection is, then, one of the
major characteristics of C. trachomatis in its appropriate
hosts. C. trachomatis has also been demonstrated to
enter a persistent state after treatment with cytokines
such as interferon-gamma (Interferon-gamma), treatment with antibiotics, or restriction of certain nutrients,
or to enter this state spontaneously under certain culture conditions 17. While the organism is in the persistent
state, metabolic activity is reduced, and the organism is
often refractory to antibiotic treatment 17. In conclusion,
the present case report underlines the role of C. trachomatis infection in young males and highlights the damage to spermatozoa by C. trachomatis. The role of C.
trachomatis infection in male fertility decreasing should
now be clearer, due to the many published studies and
reported experiences.
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