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Lydia Visser
PhD

My research in the Pathology department is mainly focused on immunological aspects of B-cell lymphoma. I study interactions of tumor cells with the microenvironment, and signaling pathways in Hodgkin lymphoma and non-Hodgkin lymphomas.

Enhancing the Cytotoxicity and Apoptotic Efficacy of Parasporin-2-Derived Variants (Mpp46Aa1) on Cancer Cell Lines
Published in: Toxins
Parasporin PS2Aa1, recently renamed Mpp46Aa1, is an anti-cancer protein known for its selectivity against various human cancer cell lines. We genetically modified native PS2Aa1 to create a library of approximately 100 mutants. From this library, we selected promising mutants based on their half-maximal inhibitory concentration (IC 50) and sequence variations. In this study, Variant 3-35, with the G257V substitution, demonstrated increased cytotoxicity and selectivity against the colon cancer cell line SW480. Conversely, Variant N65, featuring substitutions N92D, K175R, and S218G, yielded the most favorable results against the cancer...
Juan S Alarcón-Aldana, Lydia Visser, Nohora J Rueda-Forero, Efraín H Pinzón-Reyes, Paola Rondón-Villarreal, Miguel O Suárez-Barrera
TOX as a new diagnostic marker for T cell large granular lymphocytic leukaemia
Published in: Histopathology
AIMS: T cell large granular lymphocytic leukaemia (T-LGLL) is a rare disorder that may underlie otherwise unexplained cytopenias. The identification of T-LGLL cells in bone marrow biopsies can be a challenge, because a robust immunohistochemistry marker is lacking. The markers currently in use (granzyme B, TIA-1 and CD8) are difficult to interpret or lack specificity. Therefore, we investigated whether immunohistochemistry for thymocyte selection-associated high-mobility group box (TOX), a transcription factor that associates with chronic T cell stimulation, could be a reliable tool for the identification of T-LGLL cells....
Novel inhibitors of aspartate transcarbamoylase (atcase) and compositions, methods and uses related thereto
The invention relates to inhibitors of Aspartate Transcarbamoylase (ATCase) and compositions, methods and uses related thereto, such as the treatment of malaria, tuberculosis and proliferative diseases, e.g. cancer. Provided is an ATCase inhibitor compound of the Formula I or a pharmaceutically acceptable salt, solvent or hydrate thereof.
Matthew Robert Groves (Inventor), Chao Wang (Inventor), Sergey Lunev (Inventor), Bidong Zhang (Inventor), Alexander Stephan Siegfried Dömling (Inventor), Alida Visser (Inventor)
Novel inhibitors of aspartate transcarbamoylase (atcase) and compositions, methods and uses related thereto
The invention relates to inhibitors of Aspartate Transcarbamoylase (ATCase) and compositions, methods and uses related thereto, such as the treatment of malaria, tuberculosis and proliferative diseases, e.g. cancer. Provided is an ATCase inhibitor compound of the Formula I or a pharmaceutically acceptable salt, solvent or hydrate thereof.
Matthew Robert Groves (Inventor), Chao Wang (Inventor), Sergey Lunev (Inventor), Bidong Zhang (Inventor), Alexander Stephan Siegfried Dömling (Inventor), Alida Visser (Inventor)
Toxic Determination of Cry11 Mutated Proteins Obtained Using Rational Design and Its Computational Analysis
Published in: International Journal of Molecular Sciences
Cry11 proteins are toxic to Aedes aegypti, the vector of dengue, chikungunya, and Zika viruses. Cry11Aa and Cry11Bb are protoxins, which when activated present their active-toxin form in two fragments between 30 and 35 kDa respectively. Previous studies conducted with Cry11Aa and Cry11Bb genes using DNA shuffling generated variant 8, which presented a deletion in the first 73 amino acids and one at position 572 and 9 substitutions including L553F and L556W. In this study, variant 8 mutants were constructed using site-directed mutagenesis, resulting in conversion of phenylalanine...
Miguel O Suárez-Barrera, Diego F Herrera-Pineda, Paola Rondón-Villarreal, Efraín Hernando Pinzón-Reyes, Rodrigo Ochoa, Lydia Visser, Nohora Juliana Rueda-Forero