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EGb761 attenuates depressive-like behaviours induced by long-term light deprivation in C57BL/6J mice through inhibition of NF- κ B-IL-6 signalling pathway

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ABSTRACT

Our previous investigation found that Ginkgo extract EGb761 could attenuate the depressive-like behaviours induced by a single injection of lipopolysaccharide in mice. However, it has not been investigated whether EGb761 is effective on depressive-like behaviours induced by long-term light deprivation and whether its effects are associated with the inhibition of NF-κB-IL-6 signalling pathway. In this study, three groups (vehicle group, EGb761 low-dose group, and EGb761 high-dose group) of C57BL/6J male mice were exposed to constant darkness for four weeks. The control mice remained on a 12 : 12 light-dark cycle. Depressive-like behaviours were evaluated by tail suspension test (TST), forced swim test (FST), and sucrose preference test (SPT). Spontaneous locomotor activity was evaluated by open field test (OFT). Levels of IL-6, IL-6 mRNA, NF-κB p65, phospho-NF-κB p65, IκBα, and phospho-IκBα were measured using Elisa, western blotting, or PCR assays. NF-κB p65 DNA binding activity was evaluated using Chemi Transcription Factor Assay Kit. Results showed long-term light deprivation prolonged the immobile time in TST and FST, shortened the latency to immobility in FST, reduced spontaneous locomotor activity in OFT, decreased sucrose preference in SPT, and increased levels of IL-6, IL-6 mRNA, NF-κB p65, phospho-NF-κB p65, and phospho-IκBα in hippocampal tissue. EGb761 dose-dependently reversed the changes of the above parameters induced by long-term light deprivation, without affecting spontaneous locomotor activity. We conclude that EGb761 could attenuate the depressive-like behaviours and inhibit the NF-κB-IL-6 signalling pathway in a light-deprivation-induced mouse model of depression.

No MeSH data available.


Effect of EGb761 on NF-κB p65 DNA binding activity
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f0010: Effect of EGb761 on NF-κB p65 DNA binding activity

Mentions: Light deprivation increased the NF-κB p65 DNA binding activity of the vehicle group compared to the control group (p < 0.05). The low-dose group and the high-dose group had lower NF-κB p65 DNA binding activity than the vehicle group (both p < 0.05). The activity of the high-dose group was even lower than the low-dose group (p < 0.05) (Fig. 10).


EGb761 attenuates depressive-like behaviours induced by long-term light deprivation in C57BL/6J mice through inhibition of NF- κ B-IL-6 signalling pathway
Effect of EGb761 on NF-κB p65 DNA binding activity
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5382876&req=5

f0010: Effect of EGb761 on NF-κB p65 DNA binding activity
Mentions: Light deprivation increased the NF-κB p65 DNA binding activity of the vehicle group compared to the control group (p < 0.05). The low-dose group and the high-dose group had lower NF-κB p65 DNA binding activity than the vehicle group (both p < 0.05). The activity of the high-dose group was even lower than the low-dose group (p < 0.05) (Fig. 10).

View Article: PubMed Central - PubMed

ABSTRACT

Our previous investigation found that Ginkgo extract EGb761 could attenuate the depressive-like behaviours induced by a single injection of lipopolysaccharide in mice. However, it has not been investigated whether EGb761 is effective on depressive-like behaviours induced by long-term light deprivation and whether its effects are associated with the inhibition of NF-&kappa;B-IL-6 signalling pathway. In this study, three groups (vehicle group, EGb761 low-dose group, and EGb761 high-dose group) of C57BL/6J male mice were exposed to constant darkness for four weeks. The control mice remained on a 12 : 12 light-dark cycle. Depressive-like behaviours were evaluated by tail suspension test (TST), forced swim test (FST), and sucrose preference test (SPT). Spontaneous locomotor activity was evaluated by open field test (OFT). Levels of IL-6, IL-6 mRNA, NF-&kappa;B p65, phospho-NF-&kappa;B p65, I&kappa;B&alpha;, and phospho-I&kappa;B&alpha; were measured using Elisa, western blotting, or PCR assays. NF-&kappa;B p65 DNA binding activity was evaluated using Chemi Transcription Factor Assay Kit. Results showed long-term light deprivation prolonged the immobile time in TST and FST, shortened the latency to immobility in FST, reduced spontaneous locomotor activity in OFT, decreased sucrose preference in SPT, and increased levels of IL-6, IL-6 mRNA, NF-&kappa;B p65, phospho-NF-&kappa;B p65, and phospho-I&kappa;B&alpha; in hippocampal tissue. EGb761 dose-dependently reversed the changes of the above parameters induced by long-term light deprivation, without affecting spontaneous locomotor activity. We conclude that EGb761 could attenuate the depressive-like behaviours and inhibit the NF-&kappa;B-IL-6 signalling pathway in a light-deprivation-induced mouse model of depression.

No MeSH data available.