In:
Cancer Research, American Association for Cancer Research (AACR), Vol. 83, No. 11 ( 2023-06-02), p. 1866-1882
Kurzfassung:
Elevated IgG expression in cancer cells has been implicated in exacerbated malignancy and poor clinical prognosis. Accumulating evidence indicates that a nonconventional sialylation modification is critical for the function of cancer-derived IgG, indicating the need for a better understanding of the regulatory mechanisms that control the expression and function of sialylated cancer IgG (SIA-cIgG). Here, we conducted genome-wide CRISPR activation screening and identified OCT4 and SOX2 as the key factors that promote SIA-cIgG expression. Functional investigation revealed that SIA-cIgG reciprocally stimulated SOX2 by activating the c-Met/Akt/Erk signaling axis, constituting a self-propagating loop of SIA-cIgG/c-Met/SOX2/SIA-cIgG signaling. This signaling loop was highly active in stem-like cells from many epithelial cancers and was crucial for cancer stemness in vitro and in vivo. Notably, the mAb RP215, which specifically recognizes the Asn162 sialylation–related epitope on SIA-cIgG, effectively blocked the SIA-cIgG–driven signaling loop. Furthermore, RP215 significantly inhibited lung cancer cell stemness and tumor growth in a patient-derived xenograft model. In conclusion, these findings revealed a self-propagating c-Met/SOX2/SIA-cIgG signaling loop that promotes cancer stemness, identifying novel therapeutic strategies for cancer treatment. Significance: Sialylated cancer IgG activates c-Met-SOX2 signaling to promote stemness properties in cancer cells and can be targeted to suppress tumor growth.
Materialart:
Online-Ressource
ISSN:
0008-5472
,
1538-7445
DOI:
10.1158/0008-5472.CAN-22-2733
Sprache:
Englisch
Verlag:
American Association for Cancer Research (AACR)
Publikationsdatum:
2023
ZDB Id:
2036785-5
ZDB Id:
1432-1
ZDB Id:
410466-3
