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The Antithetic Roles of IQGAP2 and IQGAP3 in Cancers
Fei Song1, Qingqing Dai2, Marc-Oliver Grimm1
1Department of Urology, Jena University Hospital, 07740 Jena, Germany.
Abstract:
The scaffold protein family of IQ motif-containing GTPase-activating proteins (IQGAP1, 2, and 3) share a high degree of homology and comprise six functional domains. IQGAPs bind and regulate the cytoskeleton, interact with MAP kinases and calmodulin, and have GTPase-related activity, as well as a RasGAP domain. Thus, IQGAPs regulate multiple cellular processes and pathways, affecting cell division, growth, cell-cell interactions, migration, and invasion. In the past decade, significant evidence on the function of IQGAPs in signal transduction during carcinogenesis has emerged. Compared with IQGAP1, IQGAP2 and IQGAP3 were less analyzed. In this review, we summarize the different signaling pathways affected by IQGAP2 and IQGAP3, and the antithetic roles of IQGAP2 and IQGAP3 in different types of cancer. IQGAP2 expression is reduced and plays a tumor suppressor role in most solid cancer types, while IQGAP3 is overexpressed and acts as an oncogene. In lymphoma, for example, IQGAPs have partially opposite functions. There is considerable evidence that IQGAPs regulate a multitude of pathways to modulate cancer processes and chemoresistance, but some questions, such as how they trigger this signaling, through which domains, and why they play opposite roles on the same pathways, are still unanswered.
Insights
IQGAP2 and IQGAP3 proteins have opposing roles in cancer. IQGAP2 acts as a tumor suppressor, while IQGAP3 functions as an oncogene, impacting various signaling pathways and cancer progression.
Area of Science:
- Molecular Biology
- Cancer Biology
- Cell Signaling
Background:
- IQ motif-containing GTPase-activating proteins (IQGAP1, 2, and 3) are homologous scaffold proteins with multiple functional domains.
- IQGAPs regulate crucial cellular processes including the cytoskeleton, cell division, migration, and invasion.
- Emerging evidence highlights IQGAP roles in cancer signal transduction, with IQGAP2 and IQGAP3 being less studied than IQGAP1.
Purpose of the Study:
- To review signaling pathways influenced by IQGAP2 and IQGAP3.
- To summarize the contrasting roles of IQGAP2 and IQGAP3 in various cancer types.
- To highlight unanswered questions regarding IQGAP-mediated signaling in carcinogenesis.
Main Methods:
- Literature review of studies on IQGAP2 and IQGAP3 signaling in cancer.
- Analysis of expression patterns and functional roles of IQGAP2 and IQGAP3 in different malignancies.
- Comparison of IQGAP2 and IQGAP3 functions across various cancer types and signaling pathways.
Main Results:
- IQGAP2 expression is frequently decreased, acting as a tumor suppressor in most solid tumors.
- IQGAP3 is often overexpressed and functions as an oncogene.
- IQGAPs exhibit partially opposing functions in certain cancers like lymphoma, modulating cancer processes and chemoresistance.
Conclusions:
- IQGAP2 and IQGAP3 play distinct and often opposing roles in cancer development and progression.
- Understanding IQGAP-mediated signaling is crucial for cancer therapy, despite remaining questions about their precise mechanisms and domain involvement.
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