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Analyzing serum-stimulated prostate cancer cell lines after low-fat, high-fiber diet and exercise intervention
Sherry Soliman1, William J Aronson, R James Barnard
1Department of Physiological Science, University of California, Los Angeles, CA 90095, USA.
Abstract:
Serum from men undergoing a low-fat, high-fiber diet and exercise intervention has previously been shown to decrease growth and increase apoptosis in serum-stimulated, androgen-dependent LNCaP cells associated with a reduction in serum IGF-I. Here we sought to determine the underlying mechanisms for these anticancer effects. Again, the intervention slowed growth and increased apoptosis in LNCaP cells; responses that were eliminated when IGF-I was added back to the post-intervention samples. The p53 protein content was increased and NFκB activation reduced in the post serum-stimulated LNCaP cells. Similar results were observed when the IGF-I receptor was blocked in the pre-intervention serum. In androgen-independent PC-3 cells, growth was reduced while none of the other factors were changed by the intervention. We conclude that diet and exercise intervention might help prevent clinical PCa as well as aid in the treatment of PCa during the early stages of development.
Insights
A low-fat, high-fiber diet and exercise intervention showed potential in slowing prostate cancer (PCa) growth and increasing cancer cell death. Adding insulin-like growth factor-I (IGF-I) reversed these beneficial effects, suggesting IGF-I is a key mediator.
Area of Science:
- Oncology
- Endocrinology
- Nutrition Science
Background:
- Lifestyle interventions, including diet and exercise, are explored for prostate cancer (PCa) prevention and treatment.
- Previous studies indicated serum from men on such interventions reduced growth and increased apoptosis in prostate cancer cells, linked to reduced insulin-like growth factor-I (IGF-I).
Purpose of the Study:
- To elucidate the specific mechanisms by which diet and exercise interventions exert anticancer effects on prostate cancer cells.
- To investigate the role of IGF-I in mediating the observed effects of lifestyle interventions.
Main Methods:
- Utilized androgen-dependent LNCaP and androgen-independent PC-3 prostate cancer cell lines.
- Applied serum from men before and after a low-fat, high-fiber diet and exercise intervention.
- Investigated the impact of adding back IGF-I to post-intervention serum and blocking the IGF-I receptor.
Main Results:
- The intervention slowed LNCaP cell growth and increased apoptosis, effects abolished by adding IGF-I.
- Intervention led to increased p53 protein content and reduced NFκB activation in LNCaP cells.
- IGF-I receptor blockade mimicked the intervention's effects on LNCaP cells; PC-3 cell growth was reduced without other changes.
Conclusions:
- Diet and exercise interventions may inhibit prostate cancer progression by modulating IGF-I signaling pathways.
- These findings suggest lifestyle interventions could be valuable in preventing and treating early-stage prostate cancer.
