| First Author | Esquivel-Rendón E | Year | 2019 |
| Journal | Neuroscience | Volume | 414 |
| Pages | 280-296 | PubMed ID | 31301368 |
| Mgi Jnum | J:282880 | Mgi Id | MGI:6384322 |
| Doi | 10.1016/j.neuroscience.2019.07.002 | Citation | Esquivel-Rendon E, et al. (2019) Interleukin 6 Dependent Synaptic Plasticity in a Social Defeat-Susceptible Prefrontal Cortex Circuit. Neuroscience 414:280-296 |
| abstractText | The role of the pro-inflammatory cytokine interleukin-6 (IL-6) in the etiology of stress-induced synaptic plasticity is yet unknown. We took advantage of a genetically modified mouse (TG) in which IL-6 trans-signaling via the soluble IL-6 receptor was blocked, to determine the role of IL-6 trans-signaling in the effects of a Social Defeat protocol (SD) on synaptic function of the medial prefrontal cortex (mPFC). Synaptic function in stress-sensitive (S) and stress-resilient (R) animals was studied in a mPFC slice preparation with whole-cell patch-clamp recording. SD altered numerous synaptic properties of the mPFC: R WT (but not TG) displayed a decreased ratio between N methyl-D-aspartate receptor (NMDAR-) dependent and amino propionic acid receptor (AMPAR-) dependent-current (INMDA/IAMPA), while S WT animals (but not TG) showed a reduced ratio between AMPA and gamma-amino-butyric acid receptor type A (GABAAR)-dependent currents (IAMPA/IGABA). Also, SD induced an increase in the frequency but a decrease in the amplitude of excitatory action-potential dependent PSCs (sEPSCs), both in an IL-6 dependent manner, as well as a generalized (S/R-independent) decrease in the frequency of action potential independent (miniature) excitatory (IL-6 dependent) as well as inhibitory (IL-6 independent) postsynaptic current frequency. Interestingly, corner preference (measuring the intensity of social defeat) correlated positively with INMDA/IAMPA and eEPSC frequency and negatively with IAMPA/IGABA. Our results suggest that SD induces behaviorally-relevant synaptic rearrangement in mPFC circuits, part of which is IL-6 dependent. In particular, IL-6 is necessary to produce synaptic plasticity leading to stress resilience in some individuals, but to stress sensitivity in others. |
