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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Cancer+Res
2018 ; 8
(6
): 1050-1063
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Blocking LLT1 (CLEC2D, OCIL)-NKRP1A (CD161) interaction enhances natural killer
cell-mediated lysis of triple-negative breast cancer cells
#MMPMID30034942
Marrufo AM
; Mathew SO
; Chaudhary P
; Malaer JD
; Vishwanatha JK
; Mathew PA
Am J Cancer Res
2018[]; 8
(6
): 1050-1063
PMID30034942
show ga
Triple-negative breast cancer (TNBC) is the most invasive form of breast cancer
due to an absence of estrogen (ER), progesterone (PR), and human epidermal growth
factor-2 (HER2) receptors on the cell surface. TNBC accounts for approximately 12
to 20 percent of all breast cancer cases. The absence of ER, PR, and HER2
receptors on TNBCs and its ability to develop drug resistance renders it
difficult to eradicate or retrogress tumor growth with hormonal therapy and
chemotherapy. Triple-negative breast cancer is associated with poorer prognosis,
increased chance of relapse, and lower chance of survival. Patients with TNBC
have poorer outcome to conventional treatments than patients with other types of
breast cancer. Natural killer cell-mediated immunotherapy is a promising
therapeutic option for patients with TNBC. Natural killer cells contribute to the
immune system by recognizing tumor cells through interactions between ligands on
tumor cells and natural killer cell receptors. NK cell function is regulated by a
net balance of signals from activating and inhibitory receptors interacting with
ligands on target cells. Lectin-like Transcript-1 (LLT1, CLEC2D, OCIL) is a
ligand that interacts with NK cell receptor NKRP1A (CD161) and inhibits NK cell
activation. In this study, we have identified expression of LLT1 on TNBC cell
lines MDA-MB-231 and MDA-MB-436 through flow cytometry, western blot, and
confocal microscopy. We have demonstrated that blocking LLT1 on TNBCs with
antibodies disrupts interaction with NKRP1A and enhances lysis of TNBCs by
primary natural killer cells. We have also shown that a gene knockdown of LLT1
decreases cell surface expression of LLT1 on TNBCs and increases NK cell-mediated
lysis of these TNBCs. The results suggest that LLT1 on TNBCs function as a method
of evasion from immunosurveillance by NK cells. Blocking LLT1-NKRP1A interaction
activates lysis by NK cells and will potentially open a new immunotherapeutic
strategy for treatment of TNBC.