The motor abnormalities of Parkinson's disease (PD) are caused by alterations in basal ganglia network activity, including disinhibition of the subthalamic nucleus (STN), and excessive activity of the major output nuclei. Using adeno-associated viral vector-mediated somatic cell gene transfer, we expressed glutamic acid decarboxylase (GAD), the enzyme that catalyzes synthesis of the neurotransmitter GABA, in excitatory glutamatergic neurons of the STN in rats. The transduced neurons, when driven by electrical stimulation, produced mixed inhibitory responses associated with GABA release. This phenotypic shift resulted in strong neuroprotection of nigral dopamine neurons and rescue of the parkinsonian behavioral phenotype. This strategy suggests that there is plasticity between excitatory and inhibitory neurotransmission in the mammalian brain that could be exploited for therapeutic benefit.

Purpose: Developed herein is a three-dimensional (3D) flow contrast imaging system leveraging advancements in the extension of laser speckle contrast imaging theories to deep tissues along with our recently developed finite-element diffuse correlation tomography (DCT) reconstruction scheme. This technique, termed speckle contrast diffuse correlation tomography (scDCT), enables incorporation of complex optical property heterogeneities and sample boundaries. When combined with a reflectance-based design, this system facilitates a rapid segue into flow contrast imaging of larger, in vivo applications such as humans. Methods: A highly sensitive CCD camera was integrated into a reflectance-based optical system. Four long-coherence laser source positions were coupled to an optical switch for sequencing of tomographic data acquisition providing multiple projections through the sample. This system was investigated through incorporation of liquid and solid tissue-like phantoms exhibiting optical properties and flow characteristics typical of human tissues. Computer simulations were also performed for comparisons. A uniquely encountered smear correction algorithm was employed to correct pointsource illumination contributions during image capture with the frame-transfer CCD and reflectance setup. Results: Measurements with scDCT on a homogeneous liquid phantom showed that speckle contrastbased deep flow indices were within 12% of those from standard DCT. Inclusion of a solid phantom submerged below the liquid phantom surface allowed for heterogeneity detection and validation. The heterogeneity was identified successfully by reconstructed 3D flow contrast tomography with scDCT. The heterogeneity center and dimensions and averaged relative flow (within 3%) and localization were in agreement with actuality and computer simulations, respectively. Conclusions: A custom cost-effective CCD-based reflectance 3D flow imaging system demonstrated rapid acquisition of dense boundary data and, with further studies, a high potential for translatability to real tissues with arbitrary boundaries. A requisite correction was also found for measurements in the fashion of scDCT to recover accurate speckle contrast of deep tissues. C 2015 American Association of Physicists in Medicine. [http://dx

Epithelial-mesenchymal transition (EMT) is a critical step in the metastasis of hepatocellular carcinoma (HCC). BTB/POZ domain-containing protein 7 (BTBD7) regulates EMTassociated proteins implicated in HCC progression. However, the role(s) of BTBD7 in HCC have not been identified. Using highly metastatic HCC HCCLM3 cells, immortalized L02 hepatocytes, metastatic HCC animal models, and three independent cohorts of HCC patient specimens, we aimed to determine the involvement of BTBD7 in HCC metastasis. We show that BTBD7 messenger RNA and protein was highly expressed in HCC cells and tumor tissues, with such expression being associated with: enhanced cell motility, venous invasion, and poor prognosis. BTBD7 promoted HCC angiogenesis and metastasis in vitro and in vivo, but did not influence cell proliferation or colony formation. BTBD7 enhancement of HCC invasion and EMT phenotype occurred through activation of a RhoC-Rock2-FAK-signaling pathway, resulting in matrix metalloproteinase-2/9 production and microvessel formation. Applying a predictive risk score model, Cox regression analysis revealed that high BTBD7 expression integrated with high microvessel density was a powerful independent predictive factor of HCC clinical outcome. Conclusion: The present study identifies BTBD7 as a novel candidate prognostic factor and a potential therapeutic target of HCC. (HEPATOLOGY 2013; 57:2326-2337 H epatocellular carcinoma (HCC) is the third leading cause of cancer-related death worldwide. Overall survival (OS) of HCC patients remains unsatisfactory because of a high incidence of recurrence and metastasis after hepatic resection. 1 Understanding the mechanisms of HCC recurrence and metastasis should improve HCC treatment and outcomes.Epithelial-mesenchymal transition (EMT) is an important physiological process contributing to HCC recurrence and metastasis. Expression of several EMTassociated genes is correlated with HCC recurrence and metastasis. HCCs with EMT features consistently exhibit more venous invasion, metastases, and a poorer prognosis than those without EMT characteristics. 2 Therefore, for the treatment of HCC, there exists significant clinical potential in targeting EMT-associated factors.Members of the BTB (bric-a-brac tramtrack broad complex) (also known as POZ) gene family, characterized by a conserved BTB/POZ protein-protein interaction motif, have been implicated in human cancer. 3,4 The promoter region of BTB/POZ domain-containing protein 7 (BTBD7) contains binding sites for notable transcription factors, including alpha-fetoprotein (AFP)-1, CAAT enhancer-binding protein beta, GATA,

TPX2 is phosphorylated by Aurora A and is essential for normal microtubule flux on the metaphase spindle.

No abstract

Lamin B receptor (LBR), a chromatin and lamin B-binding protein in the inner nuclear membrane, has been proposed to target the membrane precursor vesicles to chromatin mediated by importin ␤ during the nuclear envelope (NE) assembly. However, the mechanisms for the binding of LBR with importin ␤ and the membrane targeting by LBR in NE assembly remain largely unknown. In this report, we show that the amino acids (aa) 69 -90 of LBR sequences are required to bind with importin ␤ at aa 45-462, and the binding is essential for the NE membrane precursor vesicle targeting to the chromatin during the NE assembly at the end of mitosis. We also show that this binding is cell cycle-regulated and dependent on the phosphorylation of LBR Ser-71 by p34 cdc2 kinase. RNAi knockdown of LBR causes the NE assembly failure and abnormal chromatin decondensation of the daughter cell nuclei, leading to the daughter cell death at early G 1 phase by apoptosis. Perturbation of the interaction of LBR with importin ␤ by deleting the LBR N-terminal spanning region or aa 69 -73 also induces the NE assembly failure, the abnormal chromatin decondensation, and the daughter cell death. The first transmembrane domain of LBR promotes the NE production and expansion, because overexpressing this domain is sufficient to induce membrane overproduction of the NE. Thus, these results demonstrate that LBR targets the membrane precursor vesicles to chromatin by interacting with importin ␤ in a LBR phosphorylation-dependent manner during the NE assembly at the end of mitosis and that the first transmembrane domain of LBR promotes the LBR-bearing membrane production and the NE expansion in interphase.Nucleus, the largest organelle that contains the genome of the eukaryotic organisms, is surrounded by a continuous nuclear envelope (NE) 2 composed of a pair of inner and outer nuclear membranes, studded by numerous nuclear pore complexes. Through the nuclear pore complexes, the NE controls the flow of molecules between the nucleus and the cytoplasm in a tightly regulated manner (1-5). The NE is highly dynamic during the cell cycle. It disassembles into membranous vesicles or tubules and disperses into the cytoplasm at the onset of prometaphase and reassembles around the newly replicated chromosomes at the end of mitosis using their previously disassembled components (2, 4, 6). Recently, it was shown that Ran, a small Ras-like nuclear GTPase, and its binding proteins regulate the NE assembly process (7-13). Ran exists in GTP-and GDP-bound states that interact differently with effectors. Conversion between these two states and the assembly or disassembly of the effector complexes requires the interaction of regulator proteins, the nucleus-based guanine nucleotide exchange factor RCC1 and the cytoplasm-localized GTPase-activating protein RanGAP1 (6,14). The compartmentalization of the regulators produces a high concentration gradient of Ran-GTP in the nucleus and Ran-GDP in the cytoplasm. In mitosis, after the NE breakdown, the nucleoplasm and the cytoplasm are ...

No abstract

Valproic acid is an anticonvulsant and mood-stabilizing drug used primarily in the treatment of epilepsy and bipolar disorder. Adverse effects of valproic acid are rare, but hepatotoxicity is severe in particular in those younger than 2 years old and polytherapy. During valproic acid treatment, it is difficult for prescribers to predict its individual response. Recent advances in the field of pharmacogenomics have indicated variants of candidate genes that affect valproic acid efficacy and safety. In this review, a large number of candidate genes that influence valproic acid pharmacokinetics and pharmacodynamics are discussed, including metabolic enzymes, drug transporters, neurotransmitters and drug targets. Furthermore, pharmacogenomics is an important tool not only in further understanding of interindividual variability but also to assess the therapeutic potential of such variability in drug individualization and therapeutic optimization.