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http://dx.doi.org/10.14348/molcells.2015.0038

Odorant Stimulation Promotes Survival of Rodent Olfactory Receptor Neurons via PI3K/Akt Activation and Bcl-2 Expression  

Kim, So Yeun (Department of Brain & Cognitive Sciences, Graduate School Daegu Gyeungbuk Institute of Science and Technology (DGIST))
Yoo, Seung-Jun (Department of Brain & Cognitive Sciences, Graduate School Daegu Gyeungbuk Institute of Science and Technology (DGIST))
Ronnett, Gabriele V (Department of Brain & Cognitive Sciences, Graduate School Daegu Gyeungbuk Institute of Science and Technology (DGIST))
Kim, Eun-Kyoung (Department of Brain & Cognitive Sciences, Graduate School Daegu Gyeungbuk Institute of Science and Technology (DGIST))
Moon, Cheil (Department of Brain & Cognitive Sciences, Graduate School Daegu Gyeungbuk Institute of Science and Technology (DGIST))
Publication Information
Molecules and Cells / v.38, no.6, 2015 , pp. 535-539 More about this Journal
Abstract
Olfactory stimulation activates multiple signaling cascades in order to mediate activity-driven changes in gene expression that promote neuronal survival. To date, the mechanisms involved in activity-dependent olfactory neuronal survival have yet to be fully elucidated. In the current study, we observed that olfactory sensory stimulation, which caused neuronal activation, promoted activation of the phosphatidylinositol 3'-kinase (PI3K)/Akt pathway and the expression of Bcl-2, which were responsible for olfactory receptor neuron (ORN) survival. We demonstrated that Bcl-2 expression increased after odorant stimulation both in vivo and in vitro. We also showed that odorant stimulation activated Akt, and that Akt activation was completely blocked by incubation with both a PI3K inhibitor (LY294002) and Akt1 small interfering RNA. Moreover, blocking the PI3K/Akt pathway diminished the odorantinduced Bcl-2 expression, as well as the effects on odorant-induced ORN survival. A temporal difference was noted between the activation of Akt1 and the expression of Bcl-2 following odorant stimulation. Blocking the PI3K/Akt pathway did not affect ORN survival in the time range prior to the increase in Bcl-2 expression, implying that these two events, activation of the PI3K pathway and Bcl-2 induction, were tightly connected to promote post-translational ORN survival. Collectively, our results indicated that olfactory activity activated PI3K/Akt, induced Bcl-2, and promoted long term ORN survival as a result.
Keywords
Bcl-2; odorant; olfactory receptor neuron; PI3K/Akt; survival;
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