Please use this identifier to cite or link to this item: http://hdl.handle.net/10201/37543

Title: Effects of photo stimulation and nonstimulation of golden hamsters (Mesocricetus auratus) from birth to early puberty on testes structure and function
Issue Date: 2009
Publisher: Murcia : F. Hernández
ISSN: 0213-3911
Related subjects: 61 - Medicina
Keywords: Testosterone
Thyroid hormones
Abstract: We tested whether puberty in golden hamsters is photoperiodically controlled. Hamsters were raised under 14:10 hours Light:Dark (14L) and 1:23 hours Light:Dark (1L) respectively, from birth to 28 days and tested for various parameters. Body weight, Leydig cell (LC) size and testicular testosterone secretion were greater and plasma thyroxin (T4), testicular androstenedione secretion and LC number were lower (P<0.05) in 1L than 14L hamsters. Volumes of testicular components were similar in the two groups. 3ß-hydroxy steroid dehydrogenase immunohistochemistry demonstrated LC progenitors and newly formed adult LC (ALC) in 14L hamsters, which were absent in 1L hamsters; they contained only fetal LC (FLC). Latter findings suggest the presence and absence of postnatally-differerentiated LC in 14L and 1L hamsters, respectively. Androgen results agreed with these findings, because FLC primarily secrete testosterone, and androstenedione is a major androgen secreted by the newly formed ALC. Reduced T4 in 1L hamsters is attributed to the inhibition of thyroid function by the increased duration of melatonin secretion due to non-photostimulatory conditions. The arrest in LC differentiation in 1L hamsters is attributed to low T4 levels. Although the testis size is unaltered under nonphotostimulatory conditions, postnatal LC differentiation is inhibited in golden hamsters, and therefore, it is logical to suggest that their puberty is photoperiodically controlled.
Primary author: Hance, Michael W.
Mason, J.Ian
Chamindrani Mendis-Handagama, S.M.L.
Published in: Histology and histopathology
URI: http://hdl.handle.net/10201/37543
Document type: info:eu-repo/semantics/article
Number of pages / Extensions: 8
Rights: info:eu-repo/semantics/openAccess
Appears in Collections:Vol.24,nº11 (2009)



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