Cancer chemoprevention with the adrenocortical steroid dehydroepiandrosterone and structural analogs

Area of Science:

• Endocrinology
• Cancer Biology
• Metabolic Research

Background:

• Dehydroepiandrosterone (DHEA) is an adrenocortical steroid with demonstrated broad-spectrum cancer chemopreventive effects in animal models.
• DHEA inhibits tumor initiation, epidermal hyperplasia, and papilloma promotion in mouse skin tumorigenesis models.
• Evidence suggests DHEA's anti-proliferative action stems from inhibiting glucose-6-phosphate dehydrogenase and the pentose phosphate pathway.

Purpose of the Study:

• To investigate the mechanisms underlying DHEA's chemopreventive actions.
• To explore the relationship between DHEA, food restriction, and cancer prevention.
• To determine the role of adrenal steroids in mediating the effects of food restriction.

Main Methods:

• Utilized the mouse two-stage skin tumorigenesis model to assess DHEA's effects.
• Administered DHEA to mice and monitored tumor initiation, epidermal hyperplasia, and papilloma promotion.
• Performed adrenalectomy in mice to evaluate the role of adrenal steroids in food restriction's effects.

Main Results:

• DHEA treatment inhibited tumor initiation, epidermal hyperplasia, and papilloma promotion in the mouse skin model.
• Long-term DHEA administration reduced weight gain in mice, potentially via enhanced thermogenesis.
• Adrenalectomy completely reversed the anti-hyperplastic and antitumor-promoting effects of food restriction in mice.

Conclusions:

• DHEA exhibits significant cancer chemopreventive properties by inhibiting key metabolic pathways essential for cell proliferation.
• DHEA may mediate some of the beneficial, anti-cancer effects of food restriction.
• Adrenocortical steroids, including DHEA, likely play a crucial role in mediating the tumor-inhibitory effects observed with underfeeding.