scholarly journals Somatostatin Agonist Pasireotide Promotes a Physiological State Resembling Short-Day Acclimation in the Photoperiodic Male Siberian Hamster (Phodopus sungorus)

2015 ◽  
Vol 27 (7) ◽  
pp. 588-599 ◽  
Author(s):  
R. A. Dumbell ◽  
F. Scherbarth ◽  
V. Diedrich ◽  
H. A. Schmid ◽  
S. Steinlechner ◽  
...  
Keyword(s):  
Physiological State ◽  
Phodopus Sungorus ◽  
Siberian Hamster ◽  
Short Day

Environmental induction of photononresponsiveness in the Siberian hamster, Phodopus sungorus

1997 ◽  
Vol 272 (3) ◽  
pp. R887-R895 ◽  
Author(s):  
M. R. Gorman ◽  
I. Zucker
Keyword(s):  
Locomotor Activity ◽  
Rodent Species ◽  
Phodopus Sungorus ◽  
Siberian Hamster ◽  
Short Day ◽  
Circadian Oscillators ◽  
Environmental Induction ◽  
Seasonally Breeding ◽  
Short Days

In seasonally breeding rodent species, a fraction of the population is unresponsive to short day lengths (DL) and remains reproductively competent during winter. We previously observed that incidence of nonresponsiveness to short days was affected by photoperiodic history. Here we tested whether exposure to long DL (18 h light/day; 18L) renders animals unresponsive to short DL (10L). Hamsters, maintained from birth in 10L, were transferred at week 6 to 18L or 14L. Ten weeks later (week 16), groups were transferred to 10L for 10 wk. All hamsters maintained in short DL from birth had undeveloped testes at week 6. At week 26, however, 92% of hamsters previously kept in 18L failed to undergo complete gonadal regression in 10L, compared with only 10% of hamsters previously in 14L. Entrainment of locomotor activity in 10L in nonresponsive hamsters resembled that typically observed under long DL. Exposure to 18L may induce nonresponsiveness by altering interactions of component circadian oscillators that mediate gonadal regression in short DL.

scholarly journals The Chemistry of Cold: Mechanisms of Torpor Regulation in the Siberian Hamster

Physiology ◽  
2016 ◽  
Vol 31 (1) ◽  
pp. 51-59 ◽  
Author(s):  
Ceyda Cubuk ◽  
Jonathan H. H. Bank ◽  
Annika Herwig
Keyword(s):  
Physiological State ◽  
Daily Torpor ◽  
Brain Areas ◽  
Siberian Hamster ◽  
Siberian Hamsters ◽  
Save Energy

Siberian hamsters use spontaneous daily torpor, a state of hypometabolism and hypothermia, to save energy during winter. Multiple neuroendocrine signals set the scene for spontaneous torpor to occur, and several brain areas have been identified as potential sites for torpor regulation. Here, we summarize the known mechanisms of a fascinating physiological state in the Siberian hamster.

Photoperiod-Dependent Response to Androgen in the Medial Amygdala of the Siberian Hamster, Phodopus sungorus

2002 ◽  
Vol 17 (2) ◽  
pp. 147-154 ◽  
Author(s):  
Bradley M. Cooke ◽  
Carol D. Hegstrom ◽  
S. Marc Breedlove
Keyword(s):  
Phodopus Sungorus ◽  
Medial Amygdala ◽  
Siberian Hamster
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