ABI3, a component of the WAVE2 complex, is potentially regulated by PI3K/AKT pathway
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// Lais Moraes 1 , Nilson I.T. Zanchin 2 and Janete M. Cerutti 1 1 Genetic Bases of Thyroid Tumors Laboratory, Division of Genetics, Department of Morphology and Genetics, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil 2 Instituto Carlos Chagas, Fundação Oswaldo Cruz/FIOCRUZ, Curitiba, Paraná, Brazil Correspondence to: Janete M. Cerutti, email: j.cerutti@unifesp.br Keywords: ABI3 , follicular thyroid carcinoma, WAVE2, CYFIP1, PI3K/AKT Received: June 29, 2016 Accepted: June 04, 2017 Published: June 29, 2017 ABSTRACT We previously reported that ABI3 expression is lost in follicular thyroid carcinomas and its restoration significantly inhibited cell growth, invasiveness, migration, and reduced tumor growth in vivo . The mechanistic basis by which ABI3 exerts its tumor suppressive effects is not fully understood. In this study, we show that ABI3 is a phosphoprotein. Using proteomic array analysis, we showed that ABI3 modulated distinct cancer-related pathways in thyroid cancer cells. The KEA analysis found that PI3K substrates were enriched and forced expression of ABI3 markedly decreased the phosphorylation of AKT and the downstream-targeted protein pGSK3β. We next used immunoprecipitation combined with mass spectrometry to identify ABI3-interacting proteins that may be involved in modulating/integrating signaling pathways. We identified 37 ABI3 partners, including several components of the canonical WAVE regulatory complex (WRC) such as WAVE2/CYF1P1/NAP1, suggesting that ABI3 function might be regulated through WRC. Both, pharmacological inhibition of the PI3K/AKT pathway and mutation at residue S342 of ABI3, which is predicted to be phosphorylated by AKT, provided evidences that the non-phosphorylated form of ABI3 is preferentially present in the WRC protein complex. Collectively, our findings suggest that ABI3 might be a downstream mediator of the PI3K/AKT pathway that might disrupt WRC via ABI3 phosphorylation.
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Non-phosphorylated form of ABI3 is preferentially incorporated in WRC, while the phosphorylated form represents an inactive protein not included in the complex.
“Non-phosphorylated form of ABI3 is preferentially incorporated in WRC, while the phosphorylated form represents an inactive protein not included in the complex.”
From Microglia express ABI3 in the brains of Alzheimer's disease and Nasu-Hakola disease (2017) · cites this paper as [26]
The Results ('WAVE 2 and CYFIP1 are ABI3-interacting proteins') report that non-phosphorylated ABI3 preferentially co-precipitated with WAVE2. They say only that phosphorylation *may* generate an inactive form unable to interact with WAVE2; the Discussion likewise presents inhibition of WRC formation as a proposed model. The claim overstates that proposed interpretation as an established fact. (LLM, conf=0.88)
Experimental — accuracy not yet measuredABI3 serves as a downstream mediator of the PI3K/AKT pathway that disrupts WRC via phosphorylation of ABI3.
“ABI3 serves as a downstream mediator of the PI3K/AKT pathway that disrupts WRC via phosphorylation of ABI3 (26).”
From Microglia express ABI3 in the brains of Alzheimer's disease and Nasu-Hakola disease (2017) · cites this paper as [26]
The Discussion proposes that PI3K/AKT signaling controls ABI3 phosphorylation and that phosphorylated ABI3 inhibits WRC formation. It presents this as a suggested model, however, rather than establishing the unqualified mechanism stated in the citing sentence. (LLM, conf=0.88)
Experimental — accuracy not yet measuredABI3 is phosphorylated at Ser342 by signaling through the PI3K/AKT pathway.
“ABI3 is phosphorylated at Ser342 by signaling through the PI3K/AKT pathway.”
From Microglia express ABI3 in the brains of Alzheimer's disease and Nasu-Hakola disease (2017) · cites this paper as [26]
The Results section reports that the S342A mutation and PI3K/AKT inhibition shift ABI3 toward its non-phosphorylated form. The Discussion interprets this as suggesting that PI3K/AKT potentially phosphorylates ABI3 at S342; it does not establish the claim's unqualified pathway attribution, and the Results note that another pathway might phosphorylate S342 in one cell line. (LLM, conf=0.88)
Experimental — accuracy not yet measuredABI3 is believed to be involved in actin cytoskeleton regulation by participating in the WAVE regulatory complexes, but its exact function in the cell remains unknown.
“Similar to other ABI proteins, ABI3 is also believed to be involved in the actin cytoskeleton regulation by participating in the WASP family Verprolin homolog protein (WAVE) regulatory complexes (WRC), but its exact function in the cell remains unknown 5 .”
From ABI3 deletion in TgCRND8 mice is associated with reduced amyloid plaque pathology and altered glial response (2023) · cites this paper as [5]
The Introduction identifies ABI3 as a WAVE regulatory complex component, and the Results report its interaction with WAVE2 and CYFIP1, supporting the proposed link to actin-cytoskeleton regulation. The Introduction says the precise mechanism of ABI3’s cytoskeleton-remodeling effect in thyroid cells is unknown; it does not establish that ABI3’s exact function is unknown in cells generally. (LLM, conf=0.83)
Experimental — accuracy not yet measuredABI3 participates in the WAVE regulatory complex, which is involved in actin cytoskeleton organization.
“It participates in the WASP-family verprolin homologous protein (WAVE) regulatory complex, which is involved in actin cytoskeleton organization (20, 21).”
From The effect of Abi3 locus deletion on the progression of Alzheimer’s disease-related pathologies (2023) · cites this paper as [21]
ABI3 is a component of the WAVE regulatory complex in several cancer cells.
“ABI3 has been identified as a component of WASP-family verprolin homologous protein (WAVE) regulatory complex in several cancer cells (12, 13).”
From Deletion of <i>Abi3</i> gene locus exacerbates neuropathological features of Alzheimer’s disease in a mouse model of Aβ amyloidosis (2021) · cites this paper as [13]
ABI3 is involved in actin regulation.
“Because ABI3 is involved in actin regulation (13, 44), loss of Abi3 gene may impair actin remodeling and thereby migration of microglia toward Aβ plaques.”
From Deletion of <i>Abi3</i> gene locus exacerbates neuropathological features of Alzheimer’s disease in a mouse model of Aβ amyloidosis (2021) · cites this paper as [13]
Abi3 is suggested to exert its function through participation in the WAVE2 complex, a regulator of cytoskeletal remodeling.
“While much remains to be discovered regarding the cellular functions of Abi3, it is suggested to exert its function through its participation in the WASP family verprolin-homologous protein-2 (WAVE2) complex, a regulator of cytoskeletal remodeling (Takenawa and Suetsugu, 2007; Moraes et al., 2017).”
From Deletion of the Alzheimer’s disease risk gene Abi3 locus results in obesity and systemic metabolic disruption in mice (2022) · cites this paper as Moraes et al., 2017
Forced expression of ABI3 in thyroid cancer cells substantially reduced the phosphorylation of AKT at both Thr308 and Ser473 and GSK3β at Ser9.
“Forced expression of ABI3 in thyroid cancer cells substantially reduced the phosphorylation of AKT at both Thr308 and Ser473 and GSK3β at Ser9 (26).”
From Microglia express ABI3 in the brains of Alzheimer's disease and Nasu-Hakola disease (2017) · cites this paper as [26]
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BackgroundMicroglia express ABI3 in the brains of Alzheimer's disease and Nasu-Hakola disease
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“It participates in the WASP-family verprolin homologous protein (WAVE) regulatory complex, which is involved in actin cytoskeleton organization (20, 21).”
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- Authors
- Moraes, L., Zanchin, N. I. T., & Cerutti, J. M.
- Affiliations
- Universidade Federal de São Paulo (BR)
- Instituto Carlos Chagas (BR)
- Corresponding author
- Cerutti, Janete M.
- Venue
- Oncotarget
- Publisher
- Impact Journals, LLC
- Published
- 2017-06-29
- Volume
- 8
- Issue
- 40
- Pages
- 67769-67781
- ISSN
- 1949-2553 (ISSN-L)
- PMC
- PMC5620210
- OpenAlex
- W2733874486
- Cited by
- 22
- References
- 0
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 4 · 2023: 4 · 2022: 3 · 2021: 5 · 2020: 2 · 2019: 1 · 2017: 1
- FWCI
- 0.87
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- cc-by
- Locations
- Oncotarget (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, other-oa)
- Americanae (AECID Library) (submittedVersion, other-oa)
- Arca - Repositório Institucional da Fiocruz (submittedVersion, other-oa)
- Funders
- Fundação de Amparo à Pesquisa do Estado de São Paulo (13/03867-5, 2014/)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (2013/03867-5)
- Fundação Oswaldo Cruz
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Cancer Diagnosis and Treatment
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Keywords
- ABI3, WAVE2, WAVE regulatory complex, CYFIP1, PI3K/Akt signaling, follicular thyroid carcinoma, tumor suppressor, protein phosphorylation, Akt, GSK3β, protein-protein interaction
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