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Antitumor properties of phenothiazines
N Motohashi1, S R Gollapudi, J Emrani
1Department of Medicinal Chemistry, Meiji College of Pharmacy, Tokyo, Japan.
Abstract:
The purpose of this review is to describe and evaluate the antineoplastic properties of phenothiazines. The present research studies suggest that many phenothiazines do not show significant antitumor and antineoplastic activity and so they cannot be used as potential drugs to treat cancer. However some of their derivatives help indirectly in decreasing cytotoxic effects caused by radiation and other chemical carcinogens. Additionally, some phenothiazine derivatives provide protection against cancers caused by metabolic activation of carcinogens such as dimethylbenzanthracene. The selective accumulation of phenothiazine derivatives in certain tissues such as brain and melanoma tumors may provide an effective treatment of such tumors. Current studies suggest that highly potent phenothiazine derivatives can be made by nitro substitution on the aromatic ring of phenothiazines.
Insights
Phenothiazines show limited direct anticancer effects but some derivatives can reduce radiation toxicity and protect against carcinogens. Nitro-substituted derivatives may offer potent cancer treatment options.
Area of Science:
- Pharmacology
- Oncology
- Medicinal Chemistry
Background:
- Phenothiazines are a class of compounds with diverse biological activities.
- Their potential as anticancer agents has been a subject of ongoing research.
- Understanding their antineoplastic properties is crucial for developing new cancer therapies.
Purpose of the Study:
- To review and evaluate the antineoplastic properties of phenothiazines.
- To identify potential therapeutic applications and limitations of phenothiazines in cancer treatment.
- To explore strategies for enhancing the anticancer efficacy of phenothiazine derivatives.
Main Methods:
- Literature review of existing research on phenothiazines and their anticancer activity.
- Analysis of studies investigating the effects of phenothiazines on tumor growth and cancer cells.
- Evaluation of data on the protective effects of phenothiazine derivatives against carcinogens and radiation.
Main Results:
- Many phenothiazines exhibit insignificant antitumor and antineoplastic activity.
- Certain phenothiazine derivatives demonstrate indirect benefits by mitigating cytotoxic effects from radiation and chemical carcinogens.
- Some derivatives offer protection against carcinogen-induced cancers, like those from dimethylbenzanthracene.
- Selective accumulation of derivatives in tissues like the brain and melanoma tumors suggests targeted treatment potential.
- Nitro substitution on the aromatic ring can yield highly potent phenothiazine derivatives.
Conclusions:
- Phenothiazines have limited direct utility as standalone cancer drugs.
- Phenothiazine derivatives show promise in supportive cancer care and targeted therapies.
- Further research into nitro-substituted phenothiazines could lead to novel anticancer agents.