Viral-mediated expression of a constitutively active form of CREB in the dentate gyrus does not induce abnormally enduring fear memory.

Increasing CREB-dependent transcription in dentate gyrus (DG) granule cells in vivo using viral-mediated expression of a constitutively active form of CREB (CREBCA) is sufficient to enhance contextual fear memory but whether this treatment renders memory abnormally enduring is unknown. Here we confirm that over-expressing CREBCA in the DG increases retention of contextual fear conditioning (CFC) and show that this memory decays normally. Specifically, the retention scores of CREBCA mice are significantly higher than those of GFP-infected controls 24h after the conditioning, but match them after a longer exposure session and are still in the same range 48 h later.

Synaptic adaptations of CA1 pyramidal neurons induced by a highly effective combinational antidepressant therapy.

Background: Antidepressants (AD) need to be chronically administered (weeks to months) to provide beneficial effects. Evidence suggests that combined administration of inhibitors of monoamine reuptake and phosphodiesterase type 4 allows a highly effective therapeutic action. Also, this coadministration more rapidly boosts the cyclic adenosine monophosphate (cAMP) pathway, which is normally activated during chronic treatment of single compounds.

Viral-mediated expression of a constitutively active form of CREB in hippocampal neurons increases memory.

Synaptic activity-dependent phosphorylation of the transcription factor cAMP response element binding protein (CREB) leads to CREB-dependent gene transcription, a process thought to underlie long-term hippocampal synaptic plasticity and memory formation. We previously reported that increasing CREB activity in glutamatergic neurons enhances synaptic plasticity and neuronal excitability. Whether these modifications are sufficient to promote hippocampal-dependent memory formation was not determined.

EVA regulates thymic stromal organisation and early thymocyte development.

Epithelial V-like antigen (EVA) is an immunoglobulin-like adhesion molecule identified in a screen for molecules developmentally regulated at the DN to DP progression in thymocyte development. We show that EVA is expressed during the early stages of thymus organogenesis in both fetal thymic epithelia and T cell precursors, and is progressively downregulated from day 16.5 of embryonic development.

Ligands selective for alpha4beta2 but not alpha3beta4 or alpha7 nicotinic receptors generalise to the nicotine discriminative stimulus in the rat.

Rationale: Nicotine produces behavioural effects that are potentially related to its interaction with diverse nicotinic acetylcholine receptor populations. Evidence from gene deletion studies suggests that the interoceptive stimulus properties of nicotine are mediated by heteromeric high-affinity receptors containing alpha4beta2 subunits. Mice lacking beta2 subunits do not discriminate nicotine (Shoaib et al.

Allogeneic mesoangioblasts give rise to alpha-sarcoglycan expressing fibers when transplanted into dystrophic mice.

Cell therapy for muscular dystrophy involves transplantation of either genetically modified autologous cells or normal donor cells that will be rejected unless the host is adequately immune suppressed. The extent of the immune response appears to be mitigated in this case of stem cells, by immune-suppressive and tolerogenic molecules that they release. We previously reported significant morphological and functional amelioration of a mouse model of limb-girdle muscular dystrophy by transplantation of mesoangioblasts.