چاپ صفحه |  صفحه نخست سامانه |  چکیده مقاله |  نویسندگان |  دانلود مقاله | دانشگاه علوم پزشکی تبریز |
| Inhibitory immune checkpoint (ICP) molecules are important immunosuppressive factors in a tumor microenvironment (TME). They can robustly suppress T‐cellmediated antitumor immune responses leading to cancer progression. Among the checkpoint molecules, cytotoxic T‐lymphocyte‐associated protein‐4 (CTLA‐4) is one of the critical inhibitors of anticancer T‐cell responses. Besides, the expression of adenosine receptor (A2AR) on tumor‐infiltrating T cells potently reduces their function. We hypothesized that concomitant silencing of these molecules in T cells might lead to enhanced antitumor responses. To examine this assumption, we purified T cells from the tumor, spleen, and local lymph nodes of CT26 colon cancer‐bearing mice and suppressed the expression of A2AR and CTLA‐4 using the small interfering RNA (siRNA)‐loaded polyethylene glycol‐chitosan‐alginate (PCA) nanoparticles. The appropriate physicochemical properties of the produced nanoparticles (NPs; size of 72 nm, polydispersive index [PDI] < 0.2, and zeta potential of 11 mV) resulted in their high efficiency in transfection and suppression of target gene expression. Following the silencing of checkpoint molecules, various T‐cell functions, including proliferation, apoptosis, cytokine secretion, differentiation, and cytotoxicity were analyzed, ex vivo. The results showed that the generated nanoparticles had optimal physicochemical characteristics and significantly suppressed the expression of target molecules in T cells. Moreover, a concomitant blockade of A2AR and CTLA‐4 in T cells could synergistically enhance antitumor responses through the downregulation of PKA, SHP2, and PP2Aα signaling pathways. Therefore, this combination therapy can be considered as a novel promising anticancer therapeutic strategy, which should be further investigated in subsequent studies. |
| نویسنده | نفر چندم مقاله |
|---|---|
| مهزاد ایراندوست | سوم |
| علی مسجدی | دهم |
| فرهاد جدیدی نیارق | شانزدهم |
| نسیمه آقائی وندا | هفتم |
| نام فایل | تاریخ درج فایل | اندازه فایل | دانلود |
|---|---|---|---|
| Concomitant.pdf | 1399/07/08 | 2431694 | دانلود |
