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The Role of GAB1 in Cancer
Manuel Jesús Pérez-Baena1,2, Francisco Josué Cordero-Pérez3, Jesús Pérez-Losada1,2
1Instituto de Biología Molecular y Celular del Cáncer (IBMCC-CIC), Universidad de Salamanca/CSIC, 37007 Salamanca, Spain.
Abstract:
GRB2-associated binder 1 (GAB1) is the inaugural member of the GAB/DOS family of pleckstrin homology (PH) domain-containing proteins. Upon receiving various stimuli, GAB1 transitions from the cytoplasm to the membrane where it is phosphorylated by a range of kinases. This event recruits SH2 domain-containing proteins like SHP2, PI3K's p85 subunit, CRK, and others, thereby activating distinct signaling pathways, including MAPK, PI3K/AKT, and JNK. GAB1-deficient embryos succumb in utero, presenting with developmental abnormalities in the heart, placenta, liver, skin, limb, and diaphragm myocytes. Oncogenic mutations have been identified in the context of cancer. GAB1 expression levels are disrupted in various tumors, and elevated levels in patients often portend a worse prognosis in multiple cancer types. This review focuses on GAB1's influence on cellular transformation particularly in proliferation, evasion of apoptosis, metastasis, and angiogenesis-each of these processes being a cancer hallmark. GAB1 also modulates the resistance/sensitivity to antitumor therapies, making it a promising target for future anticancer strategies.
Insights
GRB2-associated binder 1 (GAB1) is crucial for normal development and cellular signaling. Aberrant GAB1 expression drives cancer progression and influences treatment response, highlighting its potential as an anticancer target.
Area of Science:
- Cellular Biology
- Molecular Oncology
- Signal Transduction
Background:
- GRB2-associated binder 1 (GAB1) is a key signaling adapter protein.
- GAB1 integrates signals from various stimuli, localizing to the membrane and activating downstream pathways.
- GAB1 plays a critical role in embryonic development, with deficiency leading to severe abnormalities.
Purpose of the Study:
- To review the multifaceted role of GAB1 in cellular transformation.
- To explore GAB1's involvement in cancer hallmarks like proliferation, apoptosis evasion, metastasis, and angiogenesis.
- To discuss GAB1's impact on therapeutic resistance and its potential as an anticancer target.
Main Methods:
- Literature review of GAB1's function in cell signaling and cancer.
- Analysis of GAB1's role in embryonic development and oncogenesis.
- Examination of GAB1's influence on cancer hallmarks and therapeutic outcomes.
Main Results:
- GAB1 is essential for normal development; its absence causes embryonic lethality with multiple organ defects.
- GAB1 signaling pathways (MAPK, PI3K/AKT, JNK) are activated upon stimulation and are implicated in cancer.
- Elevated GAB1 expression correlates with poor prognosis in various cancers and contributes to proliferation, metastasis, and angiogenesis.
Conclusions:
- GAB1 is a critical mediator of cellular signaling with profound developmental roles.
- Dysregulated GAB1 is a significant driver of cancer progression and influences therapeutic sensitivity.
- GAB1 represents a promising therapeutic target for developing novel anticancer strategies.
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