Prospects of Delivering Natural Compounds by Polymer-Drug Conjugates in Cancer Therapeutics

Nompumelelo      Mthimkhulu; Karabo    S.    Mosiane; Ekene    E.    Nweke; Mohammed       Balogun; Pascaline   N.   Fru
doi:10.2174/1871520621666210419094623
Abstract

Synthetic chemotherapeutics have played a crucial role in minimizing mostly palliative symptoms associated with cancer; however, they have also created other problems such as system toxicity due to a lack of specificity. This has led to the development of polymer-drug conjugates amongst other novel drug delivery systems. Most of the formulations designed using delivery systems consist of synthetic drugs and face issues such as drug resistance, which has already rendered drugs such as antibiotics ineffective. This is further exacerbated by toxicity due to the long-term use. Given these problems and the fact that conjugation of synthetic compounds to polymers has been relatively slow with no formulation on the market after a decade of extensive studies, the focus has shifted to using this platform with medicinal plant extracts to improve solubility, specificity and increase drug release of medicinal and herbal bioactives. In recent years, various plant extracts such as flavonoids, tannins and terpenoids have been studied extensively using this approach. The success of formulations developed using novel drug-delivery systems is highly dependent on the tumour microenvironment especially on the enhanced permeability and retention effect. As a result, the compromised lymphatic network and ‘leaky’ vasculature exhibited by tumour cells act as a guiding principle in the delivery of these formulations. This review focuses on the state of the polymer-drug conjugates and their exploration with natural compounds, the progress and difficulties thus far, and future directions concerning cancer treatment.
Keywords: Cancer, chemotherapy, drug delivery systems, medicinal plant extracts, polymer-drug conjugates, synthetic chemotherapeutic.
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DOI https://dx.doi.org/10.2174/1871520621666210419094623	Print ISSN 1871-5206
Publisher Name Bentham Science Publisher	Online ISSN 1875-5992
Anti-Cancer Agents in Medicinal Chemistry

Prospects of Delivering Natural Compounds by Polymer-Drug Conjugates in Cancer Therapeutics

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