Helena Yusuf-Makagiansar

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A highly productive chemically defined fed-batch process was developed to maximize titer and volumetric productivity for Chinese hamster ovary cell-based recombinant protein manufacturing. Two cell lines producing a recombinant antibody (cell line A) and an Fc-fusion protein (cell line B) were used for development. Both processes achieved product titers of(More)
This review focuses on providing insights into the structural basis and clinical relevance of LFA-1 and VLA-4 inhibition by peptides and small molecules as adhesion-based therapeutic strategies for inflammation and autoimmune diseases. Interactions of cell adhesion molecules (CAM) play central roles in mediating immune and inflammatory responses. Leukocyte(More)
Interactions of cell-adhesion molecule LFA-1 and its ligand ICAM-1 play important roles during immune and inflammatory responses. Critical residues of LFA-1 for ICAM-1 binding are known to be in the I-domain of the alpha-subunit and the I-like domain of the beta-subunit. On the basis of our previous work demonstrating the inhibitory activity of I-domain(More)
A perfusion-based high cell density (HD) cell banking process has been developed that offers substantial advantages in time savings and simplification of upstream unit operations. HD cell banking provides the means to reduce the time required for culture inoculum expansion and scale-up by eliminating the need for multiple small to intermediate scale shake(More)
A recombinant monoclonal antibody produced by Chinese hamster ovary (CHO) cell fed-batch culture was found to have amino acid sequence misincorporation upon analysis by intact mass and peptide mapping mass spectrometry. A detailed analysis revealed multiple sites for asparagine were being randomly substituted by serine, pointing to mistranslation as the(More)
Tissue inflammation is characterized by aggravated leukocyte infiltration into the sites of inflammation. The mechanism requires the interactions of leukocyte adhesion-molecules and their ligands in the inflamed tissues. In this study, we demonstrate that a cyclic peptide cLAB.L [cyclo1, 12-PenITDGEATDSGC], derived from the "inserted" or I-domain of LFA-1(More)
The interaction between cell-adhesion molecules CD2 and CD58 is critical for an immune response. Modulation or inhibition of these interactions has been shown to be therapeutically useful. Synthetic 12-mer linear and cyclic peptides, and cyclic hexapeptides based on rat CD2 protein, were designed to modulate CD2-CD58 interaction. The synthetic peptides(More)
Purpose. The interaction of cell-adhesion molecules LFA-1/ICAM-1 is critical for many inflammatory and immune responses. Blockades of this interaction using antibodies or peptide analogs are being developed as therapeutic approaches for inflammatory and autoimmune diseases. The aim of this study is to examine the binding and internalization mechanisms of(More)
Blocking the T-cell adhesion signal from intercellular adhesion molecule-1/leukocyte function-associated antigen-1 interactions (Signal-2) can suppress the progression of autoimmune diseases (i.e. type-1 diabetes, psoriasis) and prevent allograph rejection. In this study, we determined the active region(s) of cLAB.L peptide [cyclo(1,12)Pen-ITDGEATDSGC] by(More)
In characterizing a cell culture process to support regulatory activities such as process validation and Quality by Design, developing a representative scale down model for design space definition is of great importance. The manufacturing bioreactor should ideally reproduce bench scale performance with respect to all measurable parameters. However, due to(More)