TY - JOUR
T1 - Notch 1 as a potential therapeutic target in cutaneous T-cell lymphoma
AU - Kamstrup, Maria Rørbæk
AU - Gjerdrum, Lise Mette Rahbek
AU - Biskup, Edyta Urszula
AU - Lauenborg, Britt Thyssing
AU - Ralfkiær, Elisabeth Methner
AU - Andersen, Anders Woetmann
AU - Ødum, Niels
AU - Gniadecki, Robert
PY - 2010/10/7
Y1 - 2010/10/7
N2 - Deregulation of Notch signaling has been linked to the development of T-cell leukemias and several solid malignancies. Yet, it is unknown whether Notch signaling is involved in the pathogenesis of mycosis fungoides and Sézary syndrome, the most common subtypes of cutaneous T-cell lymphoma. By immunohistochemistry of 40 biopsies taken from skin lesions of mycosis fungoides and Sézary syndrome, we demonstrated prominent expression of Notch1 on tumor cells, especially in the more advanced stages. The γ-secretase inhibitor I blocked Notch signaling and potently induced apoptosis in cell lines derived from mycosis fungoides (MyLa) and Sézary syndrome (SeAx, HuT-78) and in primary leukemic Sézary cells. Specific down-regulation of Notch1 (but not Notch2 and Notch3) by siRNA induced apoptosis in SeAx. The mechanism of apoptosis involved the inhibition of nuclear factor-κB, which is the most important prosurvival pathway in cutaneous T-cell lymphoma. Our data show that Notch is present in cutaneous T-cell lymphoma and that its inhibition may provide a new way to treat cutaneous T-cell lymphoma.
AB - Deregulation of Notch signaling has been linked to the development of T-cell leukemias and several solid malignancies. Yet, it is unknown whether Notch signaling is involved in the pathogenesis of mycosis fungoides and Sézary syndrome, the most common subtypes of cutaneous T-cell lymphoma. By immunohistochemistry of 40 biopsies taken from skin lesions of mycosis fungoides and Sézary syndrome, we demonstrated prominent expression of Notch1 on tumor cells, especially in the more advanced stages. The γ-secretase inhibitor I blocked Notch signaling and potently induced apoptosis in cell lines derived from mycosis fungoides (MyLa) and Sézary syndrome (SeAx, HuT-78) and in primary leukemic Sézary cells. Specific down-regulation of Notch1 (but not Notch2 and Notch3) by siRNA induced apoptosis in SeAx. The mechanism of apoptosis involved the inhibition of nuclear factor-κB, which is the most important prosurvival pathway in cutaneous T-cell lymphoma. Our data show that Notch is present in cutaneous T-cell lymphoma and that its inhibition may provide a new way to treat cutaneous T-cell lymphoma.
U2 - 10.1182/blood-2009-12-260216
DO - 10.1182/blood-2009-12-260216
M3 - Journal article
C2 - 20538790
SN - 0006-4971
VL - 116
SP - 2504
EP - 2512
JO - Blood
JF - Blood
IS - 14
ER -