@article{oai:repo.qst.go.jp:00047463,
 author = {Bakalova-Zheleva, Rumiana and Pancheva, Nikolova-Lefterova Biliana and Murayama, Shuhei and Atanasova, Severina and Zhelev, Zhivko and Aoki, Ichio and Kato, Masaru and Tsoneva, Iana and Saga, Tsuneo and バカロバ ルミアナ and ニコロヴァレフタロヴ＆＃６５５３３； ．咼螢▲福＆＃６５５３３； and 村山 周平 and アタナソヴァ セヴァリナ and Ｚｈｅｌｅｖ Ｚｈｉｖｋｏ and 青木 伊知男 and 加藤 大 and 佐賀 恒夫},
 issue = {3},
 journal = {Analytical and Bioanalytical Chemistry},
 month = {Dec},
 note = {The present study describes a development of nanohydrogel, loaded with QD705 and manganese (QD705@Nanogel & QD705@Mn@Nanogel), and its passive and electro-assisted delivery in solid tumours, visualized by fluorescence imaging and magnetic resonance imaging (MRI) on colon-cancer grafted mice as a model.
QD705@Nanogel was delivered passively predominantly into the tumor, which was visualized in vivo and ex vivo using fluorescent imaging. The fluorescence intensity increased gradually within 30 min after injection, reached a plateau between 30 min and 2 hours, and decreased gradually to the baseline within 24 hours. The fluorescence intensity in the tumor area was about 2.5 times higher than the background fluorescence. A very weak fluorescent signal was detected in the liver area, but not in the areas of kidneys or bladder. This result was in contrast with our previous study, indicating that FITC@Mn@Nanogel did not enter into the tumor and was detected rapidly in the kidney and bladder after i.v. injection [J. Mater. Chem. B 2013, 1, 4932-4938]. We found that the embedding of a hard material (as QD) in nanohydrogel changes the physical properties of the soft material (decreases the size and negative charge and changes the shape) and alters its pharmacodynamics.
Electroporation facilitated the delivery of the nanohydrogel in the tumor tissue, visualized by fluorescent imaging and MRI. Strong signal intensity was recorded in the tumor area shortly after the combined treatment (QD@Mn@Nanogel + electroporation) and it was observed even 48 hours after the electroporation. The data demonstrate more effective penetration of the nanoparticles in the tumor due to the increased permeability of blood vessels at the electroporated area. There was no rupture of blood vessels after electroporation and there were no artifacts in the images due to a bleeding.},
 pages = {905--914},
 title = {Passive and electro-assisted delivery of hydrogel nanoparticles in solid tumors, visualized by optical and magnetic resonance imaging in vivo},
 volume = {408},
 year = {2015}
}