In the last few decades, polymeric nanoparticles have been emerged as a most promising and viable technology for targeted and controlled delivery of drugs as well as delivery of bioactive compounds such as genes, drugs, nucleic acids and proteins among other things, in biomedical and pharmaceutical applications. They not only improve the solubility, bioavailability, and circulation time of previous medications, but they can also be tailor made to selectively release the drug at the target site. Furthermore, these polymeric nanoparticles can be transformed into stimuli sensitive systems based on either exogenous stimuli (such as ultrasound, light, electric pulses, magnetism) or by endogenous stimuli (such as PH, redox, enzymes, temperature, hypoxia, glucose) for efficient targeting and biodistribution of genes and drugs at specific sites. Polymeric nanoparticles for delivery of drugs and bioimaging has attained a considerable interest in various cancer therapies. In the present content, we discuss various types of stimuli-responsive-nanocarriers and their applications in different fields like bioimaging, drug delivery.,etc.
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