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Updated: Jul 14, 2026

Analysis of Retinoic Acid-induced Neural Differentiation of Mouse Embryonic Stem Cells in Two and Three-dimensional Embryoid Bodies
Published on: April 22, 2017
Retinoids as differentiating agents in oncology: a network of interactions with intracellular pathways as the basis
Enrico Garattini1, Maurizio Gianni, Mineko Terao
1Laboratory of Molecular Biology, Centro Catullo e Daniela Borgomainerio, Istituto di Ricerche Farmacologiche Mario Negri, Milano, Italy. egarattini@marionegri.it
Abstract:
Retinoic acid and natural as well as synthetic derivatives (retinoids) are promising anti-neoplastic agents endowed with both therapeutic and chemopreventive potential. Although the treatment of acute promyelocic leukemia with all-trans retinoic acid is an outstanding example, the full potential of retinoids in oncology has not yet been exploited and a more generalized use of these compounds is not yet a reality. This may be the result of issues such as natural and induced resistance as well as local and systemic toxicity. One way to enhance the therapeutic and chemopreventive activity of retinoic acid and derivatives is to identify rational combinations between these compounds and other pharmacological agents. This is now possible given the wealth of information available on the biochemical and molecular mechanisms underlying the biological activity of retinoids. At the cellular level, the anti-leukemia and anti-cancer activity of retinoids is the result of three main actions, cell-differentiation, growth inhibition and apoptosis. At the molecular level, retinoids act through the activation of nuclear-retinoic-acid-receptor-dependent and-independent pathways. The cellular pathways and molecular networks relevant for retinoid activity are modulated by a panoply of other intra-cellular and extra-cellular pathways that may be targeted by known drugs and other experimental therapeutics. The review article aims to summarize and critically discuss the available knowledge in the field and provide a rational framework that may be useful for the design of effective drug combinations with the potential to enhance the therapeutic index of retinoids.
Insights
Retinoids show promise in cancer treatment but face challenges like resistance and toxicity. Combining retinoids with other drugs could improve their effectiveness and safety in oncology.
Area of Science:
- Oncology
- Pharmacology
- Molecular Biology
Background:
- Retinoids, including retinoic acid, are potent anti-neoplastic agents with therapeutic and chemopreventive potential.
- Despite successes like treating acute promyelocytic leukemia, widespread retinoid use in cancer is limited by resistance and toxicity.
- Understanding retinoid mechanisms is key to overcoming these limitations.
Purpose of the Study:
- To review and critically discuss current knowledge on retinoid mechanisms in cancer.
- To provide a framework for designing effective retinoid combination therapies.
- To enhance the therapeutic index of retinoids in oncological applications.
Main Methods:
- Literature review of biochemical and molecular mechanisms of retinoid activity.
- Analysis of cellular actions: differentiation, growth inhibition, and apoptosis.
- Exploration of nuclear receptor-dependent and -independent pathways.
Main Results:
- Retinoids exert anti-cancer effects through cell differentiation, growth inhibition, and apoptosis.
- Retinoid action involves nuclear retinoic acid receptor (RAR)-dependent and -independent pathways.
- Intra- and extra-cellular pathways modulate retinoid activity, offering targets for combination therapy.
Conclusions:
- Rational drug combinations can enhance retinoid efficacy and reduce toxicity.
- Targeting modulating pathways presents opportunities for novel therapeutic strategies.
- Further research into retinoid combinations can improve cancer treatment outcomes.
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