title: Magnetocaloric effect in magnetothermally-responsive nanocarriers for hyperthermia-triggered drug release.
abstract: The magnetocaloric effects and lower critical solution temperature (LCST) were investigated in a magnetothermally-responsive nanocarrier for magnetothermal drug release under alternating magnetic field (AMF). The Mn(0.2)Zn(0.8)Fe(2)O(4) nanoparticles with low T(c) were dispersed in a polymeric matrix consisting of N-Isopropyl acrylamide (NIPAAm) and N-hydroxymethyl acrylamide (HMAAm). The magnetocaloric effects and LCST of the nanocarriers were characterized by using high-resolution electron transmission microscopy, thermogravimetric analyses, and vibrating sample magnetometer. The maximum self-heating temperature of 42.9 °C was achieved by optimizing the Mn(0.2)Zn(0.8)Fe(2)O(4) concentration in the polymer matrix. By adjusting the NIPAAm to HMAAm ratio, the LCST was controlled at an ideal level of 40.1 °C for efficient thermosensitive drug delivery. Magnetothermally responsive drug release of Doxorubicin, an anticancer drug, was significantly enhanced by application of an external AMF on the nanocarriers. The cytotoxicity experimental results in vitro show good biocompatibility and efficient therapeutic effects in cancer treatment.
authors.affiliation: Institute of Nano- and Bio-polymeric Materials, School of Material Science and Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, People's Republic of China.
authors.forename: Jianbo
authors.initials: J
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Qu
authors.forename: Jie
authors.initials: J
authors.lastname: Ren
authors.forename: Weizhong
authors.initials: W
authors.lastname: Yuan
authors.forename: Donglu
authors.initials: D
authors.lastname: Shi
mesh_terms: D000178:Acrylamides / Q000737:chemistry; D000903:Antibiotics, Antineoplastic / Q000008:administration & dosage* / Q000494:pharmacology; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D003692:Delayed-Action Preparations / Q000737:chemistry*; D004317:Doxorubicin / Q000008:administration & dosage* / Q000494:pharmacology; D006801:Humans; D007501:Iron / Q000737:chemistry; D060526:Magnetic Fields; D008345:Manganese / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009369:Neoplasms / Q000188:drug therapy; D013696:Temperature; D015032:Zinc / Q000737:chemistry
chemical_list: D000178:Acrylamides; D000903:Antibiotics, Antineoplastic; D003692:Delayed-Action Preparations; D008345:Manganese; D004317:Doxorubicin; C067295:N-isopropylacrylamide; D007501:Iron; D015032:Zinc; C066443:N-methylolacrylamide