Jan Paul Medema

ORCID: 0000-0003-3045-2924
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About
Contact & Profiles
Research Areas
  • Cancer Cells and Metastasis
  • Genetic factors in colorectal cancer
  • Colorectal Cancer Treatments and Studies
  • Cancer Genomics and Diagnostics
  • Cell death mechanisms and regulation
  • Immunotherapy and Immune Responses
  • Pancreatic and Hepatic Oncology Research
  • Digestive system and related health
  • Radiation Therapy and Dosimetry
  • Immune Cell Function and Interaction
  • DNA Repair Mechanisms
  • Virus-based gene therapy research
  • T-cell and B-cell Immunology
  • Immune Response and Inflammation
  • Mathematical Biology Tumor Growth
  • Epigenetics and DNA Methylation
  • Cancer-related Molecular Pathways
  • Cell Image Analysis Techniques
  • Osteoarthritis Treatment and Mechanisms
  • NF-κB Signaling Pathways
  • RNA Interference and Gene Delivery
  • Gastric Cancer Management and Outcomes
  • Wnt/β-catenin signaling in development and cancer
  • Cell Adhesion Molecules Research
  • Rheumatoid Arthritis Research and Therapies

University of Amsterdam
2016-2025

Oncode Institute
2017-2025

Amsterdam University Medical Centers
2013-2025

Cancer Center Amsterdam
2008-2025

Amsterdam UMC Location University of Amsterdam
2013-2023

Amsterdam UMC Location Vrije Universiteit Amsterdam
2023

Leiden University Medical Center
1999-2022

Sidra Medical and Research Center
2022

University Medical Center Utrecht
2015-2022

Radboud University Nijmegen
2022

Colon carcinoma is one of the leading causes death from cancer and characterized by a heterogenic pool cells with distinct differentiation patterns. Recently, it was reported that population undifferentiated primary tumor, so-called stem (CSC), can reconstitute original tumor on xenotransplantation. Here, we show spheroid cultures these colon CSCs contain expression CD133, CD166, CD44, CD29, CD24, Lgr5, nuclear beta-catenin, which have all been suggested to mark (cancer) cell population....

10.1073/pnas.0805706105 article EN Proceedings of the National Academy of Sciences 2008-09-03

10.1038/ncb2717 article EN Nature Cell Biology 2013-04-01

Betulinic Acid (BetA) and its derivatives have been extensively studied in the past for their anti-tumor effects, but relatively little is known about precursor Betulin (BE). We found that BE induces apoptosis utilizing a similar mechanism as BetA prevented by cyclosporin A (CsA). cell death more rapidly compared to BetA, achieve amounts of considerably higher concentration needed. Interestingly, we observed cholesterol sensitized cells BE-induced apoptosis, while there was no effect when...

10.1371/journal.pone.0005361 article EN cc-by PLoS ONE 2009-04-27

Induction of apoptosis by the cell surface receptor CD95 (APO-1/Fas) has been shown to involve activation a family cysteine proteases (caspases). Recently, new member this identified, designated FLICE (caspase-8/MACH/Mch5). is part death-inducing signaling complex and therefore most upstream caspase in apoptotic pathway. A total eight different isoforms (caspase-8/a–h) have described. To determine which are expressed cells we generated panel monoclonal antibodies directed against all...

10.1074/jbc.272.43.26953 article EN cc-by Journal of Biological Chemistry 1997-10-01

Colon cancer stem cells (CSC) can be identified with AC133, an antibody that detects epitope on CD133. However, recent evidence suggests expression of CD133 is not restricted to CSCs, but also expressed differentiated tumor cells. Intriguingly, we observed detection the AC133 cell surface decreased upon differentiation CSC in a manner correlated loss clonogenicity. this event did coincide change promoter activity, mRNA, splice variant, protein expression, or even In contrast, noted...

10.1158/0008-5472.can-09-1820 article EN Cancer Research 2010-01-13

Abstract In colorectal cancer (CRC), a subpopulation of tumor cells, called stem cell (CSC) fraction, is suggested to be responsible for initiation, growth, and metastasis. The search reliable marker identify these CSCs ongoing as current markers, like CD44 CD133, are more broadly expressed therefore not highly selective currently also lack function in CSC biology. Here, we analyzed whether the Wnt target Lgr5, which has earlier been identified murine intestinal could potentially serve...

10.1002/stem.1233 article EN Stem Cells 2012-09-12
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