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Interplay Among PI3K/AKT, PTEN/FOXO and AR Signaling in Prostate Cancer
Yuqian Yan1, Haojie Huang2,3,4
1Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine and Science, Rochester, MN, USA.
Abstract:
The PI3K signaling pathway is activated in a majority of cancer types. It promotes tumorigenesis by regulating nutrient metabolism, cell proliferation, survival, migration, and angiogenesis. The underlying mechanisms of PI3K/AKT activation are mainly due to deletions or mutations in its key negative regulator gene-PTEN. However, mutations in other pathway genes, such as the tumor suppressor gene SPOP, may contribute indirectly to the activation of this pathway. Interestingly, a mutually exclusive relationship exists between genomic alterations in PTEN and mutations in SPOP in prostate cancer patients, suggesting that altered functions of these two tumor suppressors might share similar or at least partially overlapping mechanisms in tumorigenesis. Activated AKT can phosphorylate directly a number of downstream effectors and thereby inhibit or activate their functions. An important target of PI3K/AKT signaling is FOXO1 protein that can be phosphorylated directly by AKT leading to translocation of FOXO1 from the cytoplasm to the nucleus. This not only impairs FOXO1 activities on transactivation of downstream target genes, but also abolishes its transcriptional activity-independent inhibitory effect on other targets such as AR, ERG and RUNX2. Interestingly, heterozygous deletion of Pten, or mutation of Spop alone has minimal effects on tumorigenesis in the mouse prostate, suggesting that PI3K/AKT pathway interacts with other pathways to drive prostate cancer progression. Indeed, the cross talk between PI3K/AKT and other pathways, such as AR, WNT, and ERK signaling pathways is known to play essential roles in disease progression and drug resistance in prostate cancer. Therefore, co-targeting the PI3K/AKT signaling pathway and its cooperating pathways may be critical for improving the anti-cancer efficacy of PI3K/AKT inhibitors in the clinic.
Insights
The PI3K/AKT pathway is crucial in many cancers, often activated by PTEN or SPOP gene alterations. Targeting this pathway with others may improve prostate cancer treatment.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- The PI3K/AKT signaling pathway is frequently activated in cancer, driving tumorigenesis through metabolic regulation, proliferation, survival, migration, and angiogenesis.
- PI3K/AKT activation commonly results from PTEN gene deletions or mutations, but SPOP gene mutations may also contribute indirectly.
- A mutually exclusive relationship between PTEN and SPOP alterations in prostate cancer suggests overlapping tumor suppressor mechanisms.
Purpose of the Study:
- To investigate the role of PI3K/AKT pathway alterations in cancer, particularly prostate cancer.
- To explore the interplay between PTEN, SPOP, and the PI3K/AKT pathway in tumorigenesis.
- To understand how PI3K/AKT signaling interacts with other pathways like AR, WNT, and ERK in prostate cancer progression and drug resistance.
Main Methods:
- Analysis of genomic alterations in PTEN and SPOP genes in prostate cancer patients.
- Investigating the downstream effects of AKT activation, including FOXO1 phosphorylation and translocation.
- Examining the impact of heterozygous Pten deletion or Spop mutation on prostate tumorigenesis in mouse models.
- Studying the crosstalk between PI3K/AKT and other signaling pathways (AR, WNT, ERK) in prostate cancer.
Main Results:
- Heterozygous deletion of Pten or mutation of Spop alone shows minimal effects on mouse prostate tumorigenesis.
- PI3K/AKT pathway activation, influenced by PTEN and SPOP, plays a role in prostate cancer progression.
- Cross-talk between PI3K/AKT and pathways like AR, WNT, and ERK is critical for disease progression and drug resistance.
Conclusions:
- Altered functions of PTEN and SPOP tumor suppressors may share overlapping mechanisms in tumorigenesis.
- The PI3K/AKT pathway interacts with other signaling pathways to drive prostate cancer progression.
- Co-targeting the PI3K/AKT pathway and cooperating pathways is essential for enhancing the efficacy of PI3K/AKT inhibitors in clinical settings.
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