TY - JOUR
T1 - CD74 interferes with the expression of fas receptor on the surface of lymphoma cells
AU - Berkova, Zuzana
AU - Wang, Shu
AU - Ao, Xue
AU - Wise, Jillian F.
AU - Braun, Frank K.
AU - Rezaeian, Abdol H.
AU - Sehgal, Lalit
AU - Goldenberg, David M.
AU - Samaniego, Felipe
N1 - Funding Information:
This work was supported by grants from the American Cancer Society (118447-MRSG-10-052-01-LIB to ZB), the National Institutes of Health (CA1206173, CA153170, CA158692, and DK091490 to F.S.), and the Leukemia and Lymphoma Society (R6132-06 and R6187-09 to F.S.). We also thank the Richard Spencer Lewis Foundation, patients and their families for their support and willingness to join us in our efforts in developing new therapies for lymphoma.
Funding Information:
This work was supported by grants from the American Cancer Society (118447-MRSG-10-052-01-LIB to ZB), the National Institutes of Health (CA1206173, CA153170, CA158692, and DK091490 to F.S.), and the Leukemia & Lymphoma Society (R6132-06 and R6187-09 to F.S.). We also thank the Richard Spencer Lewis Foundation, patients and their families for their support and willingness to join us in our efforts in developing new therapies for lymphoma.
Publisher Copyright:
© 2014 Berkova et al.;.
PY - 2014
Y1 - 2014
N2 - Background: Resistance to Fas-mediated apoptosis limits the efficacy of currently available chemotherapy regimens. We identified CD74, which is known to be overexpressed in hematological malignancies, as one of the factors interfering with Fas-mediated apoptosis. Methods: CD74 expression was suppressed in human B-lymphoma cell lines, BJAB and Raji, by either transduction with lentivirus particles or transfection with episomal vector, both encoding CD74-specific shRNAs or non-target shRNA. Effect of CD74 expression on Fas signaling was evaluated by comparing survival of mice hydrodynamically transfected with vector encoding full-length CD74 or empty vector. Sensitivity of cells with suppressed CD74 expression to FasL, edelfosine, doxorubicin, and a humanized CD74-specific antibody, milatuzumab, was evaluated by flow cytometry and compared to control cells. Fas signaling in response to FasL stimulation and the expression of Fas signaling components were evaluated by Western blot. Surface expression of Fas was detected by flow cytometry. Results: We determined that cells with suppressed CD74 are more sensitive to FasL-induced apoptosis and Fas signaling-dependent chemotherapies, edelfosine and doxorubicin, than control CD74-expressing cells. On the other hand, expression of full-length CD74 in livers protected the mice from a lethal challenge with agonistic anti-Fas antibody Jo2. A detailed analysis of Fas signaling in cells lacking CD74 and control cells revealed increased cleavage/activation of pro-caspase-8 and corresponding enhancement of caspase-3 activation in the absence of CD74, suggesting that CD74 affects the immediate early steps in Fas signaling at the plasma membrane. Cells with suppressed CD74 expression showed increased staining of Fas receptor on their surface. Pre-treatment with milatuzumab sensitized BJAB cells to Fas-mediated apoptosis. Conclusion: We anticipate that specific targeting of the CD74 on the cell surface will sensitize CD74-expressing cancer cells to Fas-mediated apoptosis, and thus will increase effectiveness of chemotherapy regimens for hematological malignancies.
AB - Background: Resistance to Fas-mediated apoptosis limits the efficacy of currently available chemotherapy regimens. We identified CD74, which is known to be overexpressed in hematological malignancies, as one of the factors interfering with Fas-mediated apoptosis. Methods: CD74 expression was suppressed in human B-lymphoma cell lines, BJAB and Raji, by either transduction with lentivirus particles or transfection with episomal vector, both encoding CD74-specific shRNAs or non-target shRNA. Effect of CD74 expression on Fas signaling was evaluated by comparing survival of mice hydrodynamically transfected with vector encoding full-length CD74 or empty vector. Sensitivity of cells with suppressed CD74 expression to FasL, edelfosine, doxorubicin, and a humanized CD74-specific antibody, milatuzumab, was evaluated by flow cytometry and compared to control cells. Fas signaling in response to FasL stimulation and the expression of Fas signaling components were evaluated by Western blot. Surface expression of Fas was detected by flow cytometry. Results: We determined that cells with suppressed CD74 are more sensitive to FasL-induced apoptosis and Fas signaling-dependent chemotherapies, edelfosine and doxorubicin, than control CD74-expressing cells. On the other hand, expression of full-length CD74 in livers protected the mice from a lethal challenge with agonistic anti-Fas antibody Jo2. A detailed analysis of Fas signaling in cells lacking CD74 and control cells revealed increased cleavage/activation of pro-caspase-8 and corresponding enhancement of caspase-3 activation in the absence of CD74, suggesting that CD74 affects the immediate early steps in Fas signaling at the plasma membrane. Cells with suppressed CD74 expression showed increased staining of Fas receptor on their surface. Pre-treatment with milatuzumab sensitized BJAB cells to Fas-mediated apoptosis. Conclusion: We anticipate that specific targeting of the CD74 on the cell surface will sensitize CD74-expressing cancer cells to Fas-mediated apoptosis, and thus will increase effectiveness of chemotherapy regimens for hematological malignancies.
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U2 - 10.1186/s13046-014-0080-y
DO - 10.1186/s13046-014-0080-y
M3 - Article
C2 - 25304249
AN - SCOPUS:84965190464
VL - 33
JO - Journal of Experimental and Clinical Cancer Research
JF - Journal of Experimental and Clinical Cancer Research
SN - 0392-9078
IS - 1
M1 - 80
ER -