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Modulation of the PI3K/Akt signaling pathway by steroidal saponins: therapeutic implications in cancer
Mohammad Bagher Majnooni1, Maryam Naseri2, Shayan Bakhshy-Chenary2
1Pharmaceutical Sciences Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.
Background:
The phosphatidylinositol 3-kinase/protein kinase B (PI3K/Akt) pathway is considered essential for cancer progression and the regulation of cellular processes, including proliferation, survival, metastasis, and angiogenesis. Conventional therapies using targeted agents such as alpelisib and everolimus have limited the effectiveness of inhibitors in exploiting effective resistance mechanisms. Steroidal saponins (SSs) are a diverse group of natural compounds recognized as anticancer agents that target multiple cells and pathways.
Purpose:
To synthesize current evidence on how SSs modulate the PI3K/Akt pathway to produce anticancer effects and to outline translational opportunities and limitations.
Methods:
We conducted a review of preclinical and translational studies indexed in PubMed/Scopus/Google Scholar up to August 2025. Studies were included if they reported mechanistic or functional modulation of the PI3K/Akt/mTOR axis (in vitro, in vivo, or ex vivo). Relevant data were compiled and organized based on compound class, experimental model, dose/exposure, and PI3K/Akt-related molecular readouts.
Results And Discussion:
This review highlights the potential of SSs to target the PI3K/Akt pathway and combat cancer progression, and addresses the limitations of conventional therapies in overcoming therapeutic resistance. SSs, as small-molecule phytochemicals, exert anticancer effects through the induction of apoptosis, inhibition of metastasis and angiogenesis, alteration of the tumor microenvironment to therapeutic advantage, promotion of the immune response, and other mechanisms that reverse multidrug resistance by modulating the PI3K/Akt pathway.
Conclusion:
The combination of SSs with chemotherapeutic agents, given emerging preclinical evidence of small-molecule efficacy, supports the development of new anticancer therapies. However, the development of SSs for clinical use remains limited due to their low bioavailability, systemic toxicity, and lack of target specificity.
Insights
Steroidal saponins (SSs) show promise in targeting the phosphatidylinositol 3-kinase/protein kinase B (PI3K/Akt) pathway for cancer treatment, offering an alternative to conventional therapies. Further research is needed to overcome limitations for clinical application.
Area of Science:
- Natural product chemistry
- Molecular oncology
- Pharmacology
Background:
- The phosphatidylinositol 3-kinase/protein kinase B (PI3K/Akt) pathway is crucial for cancer cell proliferation, survival, metastasis, and angiogenesis.
- Conventional targeted therapies often face resistance, limiting their effectiveness against cancer.
- Steroidal saponins (SSs) are natural compounds with recognized anticancer properties, targeting multiple cellular pathways.
Purpose of the Study:
- To synthesize current evidence on how steroidal saponins (SSs) modulate the PI3K/Akt pathway for anticancer effects.
- To outline translational opportunities and limitations for SSs in cancer therapy.
Main Methods:
- A comprehensive review of preclinical and translational studies was conducted.
- Studies indexed in PubMed, Scopus, and Google Scholar up to August 2025 were included.
- Data on SSs modulating the PI3K/Akt/mTOR axis (in vitro, in vivo, ex vivo) were compiled and organized.
Main Results:
- Steroidal saponins (SSs) demonstrate potential in targeting the PI3K/Akt pathway to combat cancer progression.
- SSs induce apoptosis, inhibit metastasis and angiogenesis, and modulate the tumor microenvironment.
- SSs can reverse multidrug resistance by modulating the PI3K/Akt pathway and enhance immune response.
Conclusions:
- Emerging preclinical evidence supports combining SSs with chemotherapeutics for novel anticancer therapies.
- Clinical development of SSs is hindered by low bioavailability, systemic toxicity, and lack of target specificity.
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