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Bio-mimicking melanin-manganese nanoparticles for tumor targeting MRI agent

Good quality MRI contrast agents require profound tumor-targeting ability, well relaxivity, along with rapid clearance properties. In this context, endogenous biological mimicking biomaterials, with high biodegradability and biocompatibility hold enormous potential for the development of clinically translatable nanotheranostics platforms. Manganese plays a crucial role in mitochondrial and cellular function and recently, manganese (Mn)-based contrast agents have been receiving significant attention, due to improved biosafety and superior contrast abilities. However, the long term toxicity and non-biodegradability of these inorganic nanoplatforms have significantly halted their clinical progress. In contrast to this, melanin, an asymmetrical natural biopolymer, has garnered enormous attention due to good biocompatibility, biodegradability and MRI contrast imaging abilities. Hence, exploring endogenous natural materials with high contrast properties seems promising as clinically translatable in vivo MRI imaging contrast agent.

melanin-manganese nanoparticles for tumor targeting MRI agent

The Wang group developed an ultra small and water soluble Mn2+ chelating pegylated melanin nanoparticles (MNP-PEG-Mn) demonstrating excellent tumor-targeting Magnetic Resonance Imaging (MRI) ability. The MNP-PEG-Mn nanoparticles show a size of 5.6 nm displaying high chelating stability and low cytotoxicity. Interestingly, the MNP-PEG-Mn nanoparticles show improved longitudinal relaxivity compared to clinically approved MRI contrast agent Gadodiamide. In vivo studies further showcased excellent tumor targeting abilities upon intravenous administration of MNP-PEG-Mn nanoparticles in mouse model. The author further showed that the MNP-PEG-Mn nanoparticles could be excreted via hepatobiliary and renal routes. In this process negligible toxicity was generated to body tissues that indicate high biocompatibility. Altogether, these results clinically validate the tumor targeted T1 MRI contrast properties of bio-mimicking melanin conjugated manganese nanoparticles.

Melanin-manganese nanoparticles with ultrahigh efficient clearance in vivo for tumor-targeting T1 magnetic resonance imaging contrast agent . Biomater. Sci., 2018, 6, 207-215.

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About the Web writer:

Dr. Sudip MukherjeeDr. Sudip Mukherjee is a Web Writer for Biomaterials Science. He is currently a Postdoctoral Research Associate working at the Department of Bioengineering at the Rice University. His research is involved in the development of advanced nanomaterials for drug/gene delivery in cancer theranostics, immunotherapy, immunomodulatory applications & angiogenesis. He published a total of ~30 research articles/patents. He serves as International Advisory Board Member for ‘Materials Research Express‘, IOP Sciences. He is an associate member (AMRSC) of The Royal Society of Chemistry, UK. He serves as reviewer for several international journals like Chem Comm, J Mater Chem A, J Mater Chem B, Journal of Biomedical Nanotechnology, RSC Advances, IOP Nanotechnology etc. He can be contacted by email at sudip.mukherjee@rice.edu or on Twitter.

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Biocompatible CuS-based nanoplatforms for multifunctional theranostics

The rationale for combination therapy is to employ various therapeutic methods which work using different mechanisms, thereby decreasing the chance of developing resistant cancer cells. Photothermal therapy (PTT) is the use of electromagnetic radiation to eradicate cancer cells which can also be utilized to increase the effectiveness of chemotherapy or radiation therapy. The application of targeted and functional nanoparticles can be used to overcome the existing limitations of nonspecific toxicity which is associated with PTT. Therefore, functional nanomaterials with near-infrared (NIR) PTT, high biocompatibility and excellent photothermal conversion efficiency can be dynamic tools for cancer ablation without affecting normal healthy tissue.
Biocompatible CuS-based nanoplatforms for multifunctional theranostics

The Chen group used core-shell water-soluble copper sulphide nanoparticles (CuSNPs) coated with mesoporous silica nanoshells (MSNs) for effective delivery of anti-cancer drug doxorubicin (DOX) towards H22 liver cancer. Cleverly, the hollow cavity of MSN was utilized for the loading of anti-cancer drug DOX. CuS@MSN-DOX demonstrated good water dispersibility, high stability, excellent biocompatibility and strong NIR absorption. Its excellent photothermal and NIR thermal imaging properties are due its strong NIR photothermal conversion efficiency. The anti-tumor activity of CuS@MSN-DOX was extensively studied in both in vitro and in vivo therapeutic models which supports excellent chemotherapeutic activity. Complete eradication of the liver tumor was observed by combination therapy of PTT and chemotherapy using CuS@MSN-DOX. Infrared thermal imaging was used to monitor the photothermal treatment. These results clinically validate the multifunctional cancer theranostics property of CuS@MSN-DOX that has enormous potential for clinically translatable thermochemotherapy and enhanced drug delivery in the future.

 

Biocompatible CuS-based nanoplatforms for efficient photothermal therapy and chemotherapy in vivo Biomater. Sci., 2017, 5, 475 – 484

 

 

About the WebwriterDr. Sudip Mukherjee

Dr. Sudip Mukherjee is a Web Writer for Biomaterials Science. He is currently a Postdoctoral Research Associate working alongside Dr. Omid Veiseh at the Department of Bioengineering at the Rice University. His research is involved in the development of advanced nanomaterials for drug/gene delivery in cancer theranostics, immunomodulatory applications & angiogenesis. He published a total of ~30 research articles/patents. He serves as International Advisory Board Member for‘Materials Research Express‘, IOP Sciences. He is an associate member (AMRSC) of RSC, UK. He serves as reviewer for several international journals like Chem Comm, J Mater Chem A, J Mater Chem B, Journal of Biomedical Nanotechnology, RSC Advances, IOP Nanotechnology etc.
Contact Email: sudip.mukherjee@rice.edu

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