Age-related changes in circadian rhythms in the Syrian hamster (Mesocricetus auratus) and the human

1998 ◽  
Author(s):  
Jeanne F. Duffy
Keyword(s):  
Circadian Rhythms ◽  
Syrian Hamster ◽  
Mesocricetus Auratus ◽  
Age Related ◽  
Age Related Changes

Age-related and photoperiodic variation of the DAZ gene family in the testis of the Syrian hamster (Mesocricetus auratus)

Zygote ◽  
2018 ◽  
Vol 26 (2) ◽  
pp. 127-134 ◽  
Author(s):  
Candela Rocío González ◽  
Luciana Moverer ◽  
Ricardo Saúl Calandra ◽  
Silvia Inés González-Calvar ◽  
Alfredo Daniel Vitullo
Keyword(s):  
Protein Expression ◽  
Gene Family ◽  
Syrian Hamster ◽  
Mesocricetus Auratus ◽  
Cell Number ◽  
The Novel ◽  
Age Related ◽  
Mrna And Protein Expression ◽  
Long Photoperiod ◽  
Daz Gene

SummaryThe Deleted in AZoospermia (DAZ) gene family regulates the development, maturation and maintenance of germ cells and spermatogenesis in mammals. The DAZ family consists of two autosomal genes, Boule and Dazl (Daz-like), and the Daz gene on chromosome Y. The aim of this study was to analyze the localization of DAZL and BOULE during testicular ontogeny of the seasonal-breeding Syrian hamster, Mesocricetus auratus. We also evaluated the testicular expression of DAZ family genes under short- or long-photoperiod conditions. In the pre-pubertal and adult testis, DAZL protein was found mainly in spermatogonia. BOULE was found in the spermatogonia from 20 days of age and during the pre-pubertal and adult period it was also detected in spermatocytes and round spermatids. DAZL and BOULE expression in spermatogonia was strictly nuclear only in 20-day-old hamsters. We also detected the novel mRNA and protein expression of BOULE in Leydig cells. In adult hamsters, Dazl expression was increased in regressed testis compared with non-regressed testis and DAZL protein expression was restricted to primary spermatocytes in regressed testis. These results show that DAZL and BOULE are expressed in spermatogonia at early stages in the Syrian hamster, then both proteins translocate to the cytoplasm when meiosis starts. In the adult regressed testis, the absence of DAZL in spermatogonia might be related to the decrease in germ cell number, suggesting that DAZ gene family expression is involved in changes in seminiferous epithelium during photoregression.

scholarly journals Age-Related Changes in Circadian Rhythms During Adulthood

2013 ◽  
pp. 113-117 ◽  
Author(s):  
V. Daneault ◽  
G. Vandewalle ◽  
R.P. Najjar ◽  
V. Mongrain ◽  
M. Dumont ◽  
...  
Keyword(s):  
Circadian Rhythms ◽  
Age Related ◽  
Age Related Changes

Age-Related Changes in Plasma Dehydroepiandrosterone Sulphate, Cortisol, Testosterone and Free Testosterone Circadian Rhythms in Adult Men

1988 ◽  
Vol 29 (1) ◽  
pp. 1-6 ◽  
Author(s):  
V. Montanini ◽  
M. Simoni ◽  
G. Chiossi ◽  
G.F. Baraghini ◽  
A. Velardo ◽  
...  
Keyword(s):  
Circadian Rhythms ◽  
Free Testosterone ◽  
Dehydroepiandrosterone Sulphate ◽  
Adult Men ◽  
Age Related ◽  
Age Related Changes

Age-Related Changes of Circadian Rhythms and Sleep-Wake Cycles

2003 ◽  
Vol 51 (8) ◽  
pp. 1085-1091 ◽  
Author(s):  
In-Young Yoon ◽  
Daniel F. Kripke ◽  
Jeffrey A. Elliott ◽  
Shawn D. Youngstedt ◽  
Katharine M. Rex ◽  
...  
Keyword(s):  
Circadian Rhythms ◽  
Age Related ◽  
Age Related Changes

Age related changes in the activity-rest circadian rhythms and c-fos expression of ring doves with aging. Effects of tryptophan intake

2006 ◽  
Vol 41 (4) ◽  
pp. 430-438 ◽  
Author(s):  
Celia Garau ◽  
Sara Aparicio ◽  
Rubén V. Rial ◽  
María C. Nicolau ◽  
Susana Esteban
Keyword(s):  
Circadian Rhythms ◽  
Aging Effects ◽  
Age Related ◽  
Fos Expression ◽  
Ring Doves ◽  
Age Related Changes
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