Phospholipase C beta 1 in the dentate gyrus gates fear memory formation through regulation of neuronal excitability.

Memory processes rely on a molecular signaling system that balances the interplay between positive and negative modulators. Recent research has focused on identifying memory-regulating genes and their mechanisms. Phospholipase C beta 1 (PLCß1), highly expressed in the hippocampus, reportedly serves as a convergence point for signal transduction through G protein-coupled receptors. However, the detailed role of PLCß1 in memory function has not been elucidated. Here, we demonstrate that PLCß1 in the dentate gyrus functions as a memory suppressor. We reveal that mice lacking PLCß1 in the dentate gyrus exhibit a heightened fear response and impaired memory extinction, and this excessive fear response is repressed by upregulation of PLCß1 through its overexpression or activation using a newly developed optogenetic system. Last, our results demonstrate that PLCß1 overexpression partially inhibits exaggerated fear response caused by traumatic experience. Together, PLCß1 is crucial in regulating contextual fear memory formation and potentially enhancing the resilience to trauma-related conditions.

Cerium-Based Perovskite Mixed Metal Oxide as the Radical Scavenger for PEM Fuel Cells Operating under Low Humidity Conditions.

When the polymer electrolyte membrane fuel cell (PEMFC) is operated under low humidity, the proton conductivity decreases due to membrane dehydration, causing adverse effects on fuel cell performance. Introducing appropriate additives to the membrane and catalyst layer to prevent membrane degradation at low humidity brings significant performance improvements to proton exchange membrane fuel cells. We developed a perovskite-structured multi-metal oxide Ce0.667Zr0.05Ti0.95O3-δ (CZTO) with high radical scavenging properties and good structural stability. The nanostructured ceramic CZTO is introduced into the membrane and cathode catalyst layer to improve the durability of the membrane electrode assembly. The Nafion-CZTO membrane exhibited maximum power densities of 1298 and 519 mW cm-2 at 100 and 20% relative humidity, respectively. The improved performance of Nafion-CZTO membranes over commercial Nafion membranes is due to the high proton conductivity and better radical scavenging properties of the CZTO additive. In addition, the expected positive effects of applying CZTO additives to the catalyst layer are verified by low charge transfer resistance and high electrochemical surface activity of the CZTO catalyst through electrochemical impedance spectroscopy and electrochemical surface area analyses.

An inducible system for in vitro and in vivo Fas activation using FKBP-FRB-rapamycin complex.

The inducible activation system is valuable for investigating spatiotemporal roles of molecules. A chemically inducible activation system for Fas (CD95/APO-1), which works efficiently to induce apoptosis and leads non-apoptotic pathways, has not yet been developed. Here, we engineered a rapamycin-induced dimerization system of Fas consisting of FKBP and FRB proteins. Treatment of rapamycin specifically induces cellular apoptosis. In neurons and cells with high c-FLIP expression, rapamycin-induced Fas activation triggered the activation of the non-apoptotic pathway components instead of cell death. Intracranial delivery of the system could be utilized to induce apoptosis of tumor cells upon rapamycin treatment. Our results demonstrate a novel inducible Fas activation system which operates with high efficiency and temporal precision in vitro and in vivo promising a potential therapeutic strategy.

Pathophysiologic characteristics of balloon cells in cortical dysplasia.

OBJECTS: Balloon cells are histopathological hallmarks of cortical malformations, i.e., focal cortical dysplasia (FCD) of the Taylor type or the cortical tubers of tuberous sclerosis, and they are believed to be the epileptogenic substrate and cause therapeutic drug resistant epilepsy in man. This study was carried out to investigate the developmental histogenesis and epileptogenesis of balloon cells in FCD. MATERIALS AND METHODS: We used an immunohistochemical approach to examine the expressions of primitive neuroepithelial cell antigens (CD34, nestin, and vimentin), ionotrophic glutamate receptor subunits (NR1, NR2A/B, GluR1, GluR2, GluR3, GluR4, and GluR5/6/7), and P-glycoprotein in balloon cells from FCD and normal cerebral cortex epileptogenic lesions. CONCLUSION: Balloon cells presented in clusters or as scattered cells throughout FCD lesions involving the gray and white matter. We found the balloon cells to be classifiable into three subtypes based on glial fibrillary acidic protein (GFAP) and neurofilament protein (NF-L) immunohistochemistry, i.e., as neuronal, astrocytic, and uncommitted. Immunopositivity for nestin, CD34, and vimentin in balloon cells of FCD suggests that they may be derived from the abnormal development and differentiation of neural stem cells. Moreover, it appears that epileptogenesis in cortical dysplasia is partly caused by the upregulations of some glutamate receptor subunit proteins (NR1, NR2A/B, GluR1, and GluR3) in balloon cells and dysplastic neurons. We speculate that the presence of the drug resistance protein P-glycoprotein in balloon cells might explain medically refractory epilepsy in FCD.

The structure-activity relationship of the series of non-peptide small antagonists for p56lck SH2 domain.

The antagonists for the SH2 domain are regarded as novel therapeutic candidates for cancer, autoimmune disease, and chronic inflammatory disease. Previously, we identified rosmarinic acid (alpha-o-caffeoyl-3,4-dihydroxyphenyl-lactic acid; RosA) from Prunella vulgaris as an antagonist for the p56lck SH2 domain by screening natural products. RosA not containing phosphotyrosine surrogate had a considerable inhibitory activity for T-cell antigen receptor (TCR)-induced interleukin (IL)-2 expression, and subsequent T-cell proliferation in vitro cell assay. To investigate the structure-activity relationship of RosA and to identify a novel p56lck SH2 antagonist with more potent in vitro T-cell inhibitory activity, we synthesized several analogs of RosA by using rational design. All synthesized compounds were tested in vitro binding activity for the SH2 domain and in vitro T-cell inhibitory activity. All four hydroxyl groups of RosA were essential for binding with the p56lck SH2 domain and T-cell inhibitory activity. Unexpectedly, conformationally less constrained analogs 4 and 9 showed a more potent binding affinity for the SH2 domain than that of RosA, and chirality of the analog did not play an important role in protein binding. We successfully identified several RosA analogs with a more potent T-cell inhibitory activity than that of RosA. Overall results revealed important structural requirements of the p56lck SH2 antagonists for in vitro T-cell inhibitory activity and in vitro protein binding activity.

Development of novel lipid-peptide hybrid compounds with antibacterial activity from natural cationic antibacterial peptides.

Seven depsipeptides were synthesized by appending seven amino acids (Lys, Leu, Val, Phe, Ser, Gln, and Pro) at the N-terminus of the active fragment [TE-(33-43)], respectively corresponding to the C-terminal beta sheet domain of tenecin 1, an antibacterial protein and their activities were measured against Staphylococcus aureus. Considering the relationship between the activity and the characteristic of amino acid at the N-terminal of the peptide, novel derivatives were designed and synthesized from TE-(33-43) by introduction of fatty acids at the N-terminal. In this process, we synthesized novel lipid-peptide hybrid compounds with a potent antibacterial activity and more improved bioavailabilities. We characterized the important structural parameters of the lipid-peptide hybrid compounds for the antibacterial activities.

Design and synthesis of small chemical inhibitors containing different scaffolds for lck SH2 domain.

On the basis of the structure of (R)-rosmarinic acid, a series of small chemical compounds with a different scaffold was synthesized as inhibitors for lck SH2 domain. From ELISA results, most of all chemical compounds showed a similar or a little lower binding activity for lck SH2 domain compared to the lead compound, (R)-rosmarinic acid. It was characterized that the backbone rigidity between two catechol substructures was required for the full activity and acid substructure of the lead compound was important for the activity. We successfully identified novel lead compounds that did not contain phosphotyrosine moiety and might have an improved bioavailability as inhibitor for lck SH2 domain.