Linked Life Data

11866700

Source:http://linkedlifedata.com/resource/pubmed/id/11866700

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2002-2-27
pubmed:abstractText
Germ cell production and organization of the testicular epithelium in a prosimian species, the grey mouse lemur, Microcebus murinus, was investigated to extend knowledge of comparative primate spermatogenesis. In addition, semen samples collected from adult male lemurs (body weight 53-92 g; n = 16) by rectal probe electroejaculation were evaluated using computer-assisted morphometric and kinematic analysis of spermatozoa. Epididymidal spermatozoa were collected from six animals after hemicastration; the testes were weighed and prepared for stereological analysis and flow cytometry. The relative testis mass (as a percentage of body weight) ranged between 1.17 and 5.6%. Twelve stages of testicular seminiferous epithelium as described for macaques were applied and only a single stage was observed in most of the seminiferous tubule cross-sections. On average (mean SD), a single testis contained 1870 +/- 829 x 10(6) germ cells and 35 +/- 12 x 10(6) Sertoli cells. Germ cell ratios (preleptotene:type B spermatogonia = 2, round spermatid:pachytene = 3; elongated spermatid:round spermatids = 1) indicated high spermatogenic efficacy. Sperm head dimensions and tail lengths of the ejaculated and epididymidal spermatozoa were similar. Percentages of defects (neck/mid-piece and tail) were low ( 10%) and similar for ejaculated and epididymidal spermatozoa. Spermatozoa were highly motile, characterized by extensive lateral head displacement, but relatively low progressive motility. In conclusion, the grey mouse lemur has unusually large testes with a highly efficient spermatogenic process and large sperm output. These features, together with the high proportion of morphologically normal and highly motile spermatozoa in the ejaculates, indicate that Microcebus murinus is a species in which sperm competition after ejaculation is likely to occur. The predominantly single spermatogenic stage system seems to be an ancestral feature among primates.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1470-1626
pubmed:author
pubmed:issnType
Print
pubmed:volume
123
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
323-32
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
Quantitative assessment of testicular germ cell production and kinematic and morphometric parameters of ejaculated spermatozoa in the grey mouse lemur, Microcebus murinus.
pubmed:affiliation
Institute of Reproductive Medicine, University of Muenster, D-48129 Muenster, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't