Reiter R J, Puig-Domingo M, Guerrero J M, Gonzalez-Brito A
Proc Soc Exp Biol Med. 1987 Jun;185(2):219-22. doi: 10.3181/00379727-185-42538.
The sensitivity of the Syrian hamster pineal gland to stimulation by isoproterenol is greatly increased in the latter half of the daily dark phase. This increased sensitivity requires a period of dark exposure for up to 6.5 hr. Also, if dark-maintained hamsters are exposed to light in the latter half of the night pineal melatonin levels drop precipitously but can be restimulated by isoproterenol administration. As the interval of light exposure continues, however, the pineal sensitivity to isoproterenol decreases.
叙利亚仓鼠松果体对异丙肾上腺素刺激的敏感性在每日黑暗期的后半段会大幅增加。这种敏感性增加需要长达6.5小时的黑暗暴露期。此外，如果在夜间后半段将处于黑暗环境中的仓鼠暴露于光照下，松果体褪黑素水平会急剧下降，但可通过给予异丙肾上腺素再次刺激。然而，随着光照暴露时间的持续，松果体对异丙肾上腺素的敏感性会降低。
