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How Mongersen Is Increase Anti Inflammatory Cell Signaling Essay

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-1. Sketch how mongersen is expected to increases anti-inflammatory cell signaling. (10%) Since gut inflammation of Crohn’s disease is characterized by abnormal decreases in the activity of the immunosuppressive cytokine transforming growth factor (TGF)–β1, which is induced by the increased level of SMAD7 protein, because it would prevent TGF-β1–associated and SMAD-associated signaling.[1] The formulation of Mongersen (formerly GED-0301) contains a 21-base single-strand phosphorothioate oligonucleotide, which would hybridize to the human SMAD7 messenger RNA (mRNA) complementary and then facilitate RNase H–mediated RNA degradation[1], thus it would reduce the translation product and help maintain the level of SMAD7 protein in the normal range. -2. Find the structure of mongersen: --what is the “backbone” of mongersen? (5%) Mongersen is a 21-base phosphorothioate oligonucleotide with the sequence 5′-GTC GCC CCT TCT CCC CGC AGC-3′.[1] The nonbonding oxygen in each internucleotide linkage of phosphodiesters is replaced by a sulfur atom(shows as Fig1). Also, the cytosine residues at nucleotide positions 3 and 16 are modified by 5-methylation.[1] Fig 1. The difference between phosphodiester linkage and phosphorothioate linkage. --why might the developers have chosen this backbone over other possibilities for antisense or siRNA molecules? (5%) The oligonucleotide antisense matches complementary to the region 107–128 of the human Smad7 mRNA sequence, and its

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