Vol 62, No 4 (2003)
Short communication
Published online: 2003-09-05
Morphological and functional evaluation of spermatozoa from patients with asthenoteratozoospermia
Folia Morphol 2003;62(4):479-481.
Abstract
In several cases of asthenoteratozoospermia, electron microscopic investigation
displayed immature sperm forms, morphological apoptotic patterns of spermatozoa
and many cytoplasmic conglomerates with fragments of the sperm. In
these patients, TUNEL assay showed a high percentage of spermatozoa with
nuclear DNA fragmentation. Moreover, thickened and deformed midpieces were
observed which contained supernumerary and redundant mitochondria with
normal oxidoreductive capability and normal membrane potential. In these cases
a high percentage of spermatozoa with normal ΔΨm was detected. Nevertheless,
a subpopulation of patients was found with an abnormal ultrastructure
of sperm mitochondria and with a low percentage of spermatozoa with normal
ΔΨm. These findings indicate that low motility of spermatozoa may be related
to abnormal morphogenesis of the midpiece containing functional mitochondria
and that this may be a possible consequence of an apoptotic mechanism. Furthermore,
our results show that asthenoteratozoospermia may result from dysfunction
of sperm mitochondria and/or with alternations of the structures involved in
sperm motility, i.e. the dense outer fibres, the fibrous sheath and the axoneme.
Keywords: spermatozoamorphologymitochondriaDNA integrityapoptosis
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