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Identification and molecular characterization of a novel PDE4D11 cAMP-specific phosphodiesterase isoform

机译:新型PDE4D11阵营特异性磷酸二酯酶同种型的鉴定和分子表征

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Here we report the cloning and characterization of a novel PDE4D isoform (PDE4D11) identified in mouse brain cDNA. This novel isoform has a unique isoform-specific 5'-UTR and N-terminal sequence, whereas, downstream regulatory N-terminal and catalytic C-terminal regions are homologous to other long PDE4D isoforms (Ex2-15). In silico analysis of PDE4D11 cDNA transcript identified the predicted translational start site and the use of a different transcriptional start site compared to other PDE4D isoforms. This isoform is ubiquitously expressed in different mouse tissues, particularly in the brain, liver and spleen. In the brain, PDE4D11 expression levels increased in the cerebellum, but decreased in the hippocampus with progressive age, highlighting a potential role for this isoform in the development of the brain. When transfected in vitro into murine neuroblastoma cells PDE4D11_EGFP expression is cytosolic, consistent with other long PDE4D isoforms. The appearance of cytosolic protein aggregates in discrete microdomains with this isoform, however, may represent a method of compartmentalizing PDE4D11 activity. The novel 5'-sequence of PDE4D11 is conserved among higher vertebrates including human, monkey, dog, horse and rat. Identification of this new isoform highlights the mutliplicity of unique PDE4D isoforms and their potential importance in regulating cAMP levels through compartmentalization and cell-specific expression and underscores the importance of understanding the functional role of each isoform in the development of specific drugs for the treatment of memory disorders. (c) 2008 Elsevier Inc. All rights reserved.
机译:在这里,我们报告了小鼠脑cDNA中鉴定的新型PDE4D同种型(PDE4D11)的克隆和表征。该新型同种型具有独特的同种型5'-UTR和N-末端序列,而下游调节N-末端和催化C末端区域与其他长PDE4D同种型同源(EX2-15)。在PDE4D11的硅分析中,与其他PDE4D同种型相比,PDE4D11 cDNA转录物鉴定了预测的平移起始位点和使用不同的转录开始部位。这种同种型在不同的小鼠组织中普遍地表达,特别是在大脑,肝脏和脾脏中。在大脑中,PDE4D11表达水平在小脑中增加,但具有渐进期的海马在海马中降低,突出了这种同种型在大脑发展中的潜在作用。当在体外转染到鼠神经母细胞瘤时,PDE4D11_EGFP表达是胞质溶胶,与其他长PDE4D同种型一致。然而,具有这种同种型的分立微摩体的细胞溶质蛋白质聚集体的外观可以代表划分PDE4D11活性的方法。在包括人,猴子,狗,马和大鼠的高脊椎动物中,PDE4D11的新颖5'-序列是保守的。这种新的同种型的鉴定突出了独特的PDE4D同种型的多重性,以及通过舱室化和细胞特异性表达调节CAMP水平的潜在重要性,并强调了了解每个同种型在特定药物用于治疗记忆的特定药物中的功能作用的重要性障碍。 (c)2008年elestvier Inc.保留所有权利。

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