کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1947456 1054606 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Post-translational modification of a chimeric EPO-Fc hormone is more important than its molecular size in defining its in vivo hematopoietic activity
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Post-translational modification of a chimeric EPO-Fc hormone is more important than its molecular size in defining its in vivo hematopoietic activity
چکیده انگلیسی


• Mammary gland adenoviral transduction is a robust methodology for protein expression.
• A sialylated N-glycans profile defines the hematopoietic activity of EPO-Fc variants.
• Goat mammary cells aren't a proper system for the active glyco-hormones expression.

BackgroundRecombinant erythropoietin (EPO) has been marketed as biopharmaceutical for anemia and chronic renal failure. Long-acting EPO variants that aimed at achieving less frequent dosing have been generated, either by the addition of glycosylation sites or increasing its molecular weight.MethodsThe hEPO cDNA linked to the human IgG Fc fragment was cloned as a single codifying gene on the pAdtrack-CMV vector, yielding the recombinant adenoviral genome. For in vitro and in vivo expression assays cervical cancer cell line (SiHa) and nulliparous goats were used, respectively. The hematopoietic activity of EPO-Fc, expressed as the differential increment of hematocrit was evaluated in B6D2F1 mice. NP-HPLC of the 2AB-labeled N-glycan was carried out to profile analysis.ResultsThe direct transduction of mammary secretory cells with adenoviral vector is a robust methodology to obtain high levels of EPO of up to 3.5 mg/mL in goat's milk. SiHa-derived EPO-Fc showed significant improvement in hematopoietic activity compared to the commercial hEPO counterpart or with the homologous milk-derived EPO-Fc. The role of the molecular weight seemed to be important in enhancing the hematopoietic activity of SiHa-derived EPO-Fc. However, the lack of sialylated multi-antennary glycosylation profile in milk-derived EPO-Fc resulted in lower biological activity.ConclusionsThe low content of tri- or tetra-antennary sialylated N-glycans linked to the chimeric EPO-Fc hormone, expressed in the goat mammary gland epithelial cells, defined its in vivo hematopoietic activity.General significanceThe sialylated N-glycan content plays a more significant role in the in vivo biological activity of hEPO than its increased molecular weight.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - General Subjects - Volume 1850, Issue 9, September 2015, Pages 1685–1693
نویسندگان
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