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  • Identification of orexins and cognate receptors in the lacrimal gland of sheep. 22465661

    The aim of the present work was to study, by means of immunohistochemical and RT-PCR techniques, the presence and distribution of immunopositivity for orexin A and B (OXA and OXB) and orexin type 1 and 2 receptors (OX(1)R and OX(2)R) in the lacrimal gland of sheep as well as the gene expressions for prepro-orexin (PPOX) and cognate receptors. In serial sections, positive staining for OXA and OXB were localized in the same nervous fibers within the connective tissue septa. Positive staining for OX(1)R was evidenced in the wall of small arteries while that for OX(2)R was observed in the secretory portion of the acinar gland cells with a characteristic localization in the apical cytoplasm. RT-PCR analysis showed the presence of transcripts for PPOX, OX(1)R and OX(2)R in the sheep lacrimal gland; the gene expression of OX(1)R was two-fold greater (p<0.01) than that of OX(2)R. Taken together the present findings raise intriguing questions on the potential role of the orexinergic system in the regulation of lacrimal gland functions that require further investigations.
    Tipo de documento:
    Referencia
    Referencia del producto:
    AP132B
    Nombre del producto:
    Goat Anti-Rabbit IgG Antibody, biotin-SP conjugate

  • Pioglitazone induces a proadipogenic antitumor response in mice with PAX8-PPARgamma fusion protein thyroid carcinoma. 21952241

    Approximately 35% of follicular thyroid carcinomas harbor a chromosomal translocation that results in expression of a paired box gene 8-peroxisome proliferator-activated receptor γ gene (PPARγ) fusion protein (PPFP). To better understand the oncogenic role of PPFP and its relationship to endogenous PPARγ, we generated a transgenic mouse model that combines Cre-dependent PPFP expression (PPFP;Cre) with homozygous deletion of floxed Pten (PtenFF;Cre), both thyroid specific. Although neither PPFP;Cre nor PtenFF;Cre mice develop thyroid tumors, the combined PPFP;PtenFF;Cre mice develop metastatic thyroid cancer, consistent with patient data that PPFP is occasionally found in benign thyroid adenomas and that PPFP carcinomas have increased phosphorylated AKT/protein kinase B. We then tested the effects of the PPARγ agonist pioglitazone in our mouse model. Pioglitazone had no effect on PtenFF;Cre mouse thyroids. However, the thyroids in pioglitazone-fed PPFP;PtenFF;Cre mice decreased 7-fold in size, and metastatic disease was prevented. Remarkably, pioglitazone caused an adipogenic response in the PPFP;PtenFF;Cre thyroids characterized by lipid accumulation and the induction of a broad array of adipocyte PPARγ target genes. These data indicate that, in the presence of pioglitazone, PPFP has PPARγ-like activity that results in trans-differentiation of thyroid carcinoma cells into adipocyte-like cells. Furthermore, the data predict that pioglitazone will be therapeutic in patients with PPFP-positive carcinomas.
    Tipo de documento:
    Referencia
    Referencia del producto:
    05-724
    Nombre del producto:
    Anti-Myc Tag Antibody, clone 4A6

  • Spatial and temporal expression of RP58, a novel zinc finger transcriptional repressor, in mouse brain. 17447250

    RP58, a novel zinc finger protein containing a POZ domain, is a sequence-specific transcriptional repressor. To understand the role of this protein, we examined RP58 gene expression in the developing mouse brain by quantitative polymerase chain reaction (PCR) and in situ hybridization. RP58 mRNA expression was detected at embryonic day (E) 10 in the neuroepithelium, and subsequently in the ventricular zones of the cerebral cortex in the E12 embryo. Strong expression was observed in the preplate in the cerebral cortex from this stage onward. High levels of expression continued to be detected in the cortical plate and subventricular zone of the neocortex, hippocampus, and parts of the amygdala, but not in the thalamus or striatum. These results suggest that RP58 plays a crucial role in neuronal proliferation, migration, and differentiation in the developing cerebral cortex. RP58 is also expressed in the adult mouse neocortex, hippocampus, parts of the amygdala, and granule cells in the cerebellum. Double in situ hybridization using GAD67 or VGLUT1 probes revealed that RP58 is expressed in glutamatergic excitatory neurons.
    Tipo de documento:
    Referencia
    Referencia del producto:
    MAB424
    Nombre del producto:
    Anti-PCNA Antibody, clone PC10

  • Astaxanthin attenuates the UVA-induced up-regulation of matrix-metalloproteinase-1 and skin fibroblast elastase in human dermal fibroblasts. 20219323

    BACKGROUND: Repetitive exposure of the skin to UVA radiation elicits sagging more frequently than wrinkling, which is mainly attributed to its biochemical mechanism to up-regulate the expression of matrix-metalloproteinase (MMP)-1 and skin fibroblast elastase (SFE)/neutral endopeptidase (NEP), respectively. OBJECTIVE: In this study, we examined the effects of a potent antioxidant, astaxanthin (AX), on the induction of MMP-1 and SFE by UVA treatment of cultured human dermal fibroblasts. METHODS: Those effects were assessed by real-time RT-PCR, Western blotting and enzymic activity assays. RESULTS: UVA radiation elicited a significant increase in the gene expression of MMP-1 as well as SFE/NEP (to a lesser extent) which was followed by distinct increases in their protein and enzymatic activity levels. The addition of AX at concentrations of 4-8 microM immediately after UVA exposure significantly attenuated the induction of MMP-1 and SFE/NEP expression elicited by UVA at the gene, protein and activity levels although both the UVA stimulation and the subsequent AX inhibition were greater for MMP-1 than for SFE/NEP. Analysis of the UVA-induced release of cytokines revealed that UVA significantly stimulated only the secretion of IL-6 among the cytokines tested and that AX significantly diminished only the IL-6 secretion. CONCLUSION: These findings indicate that, based on different effective concentrations of AX, a major mode of action leading to the inhibition elicited by AX depends on inhibition of UVA effects of the reactive oxygen species-directed signaling cascade, but not on interruption of the IL-6-mediated signaling cascade. We hypothesize that AX would have a significant benefit on protecting against UVA-induced skin photo-aging such as sagging and wrinkles. 2010 Japanese Society for Investigative Dermatology. Published by Elsevier Ireland Ltd. All rights reserved.
    Tipo de documento:
    Referencia
    Referencia del producto:
    PP54
    Nombre del producto:
    IgG, Mouse