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Journal Articles

Preparation and evaluation of an astatine-211-labeled sigma receptor ligand for $$alpha$$ radionuclide therapy

Ogawa, Kazuma*; Mizuno, Yoshiaki*; Washiyama, Koshin*; Shiba, Kazuhiro*; Takahashi, Naruto*; Kozaka, Takashi*; Watanabe, Shigeki; Shinohara, Atsushi*; Odani, Akira*

Nuclear Medicine and Biology, 42(11), p.875 - 879, 2015/11

 Times Cited Count:24 Percentile:70.61(Radiology, Nuclear Medicine & Medical Imaging)

Journal Articles

Preparation and biological evaluation of 3-[$$^{76}$$Br]bromo-$$alpha$$-methyl-L-tyrosine, a novel tyrosine analog for positron emission tomography imaging of tumors

Ohshima, Yasuhiro; Hanaoka, Hirofumi*; Watanabe, Shigeki; Sugo, Yumi; Watanabe, Satoshi; Tominaga, Hideyuki*; Oriuchi, Noboru*; Endo, Keigo*; Ishioka, Noriko

Nuclear Medicine and Biology, 38(6), p.857 - 865, 2011/08

 Times Cited Count:14 Percentile:47.2(Radiology, Nuclear Medicine & Medical Imaging)

Journal Articles

Chelating ion-exchange methods for the preparation of no-carrier-added $$^{64}$$Cu

Watanabe, Shigeki; Watanabe, Satoshi; Liang, J. X.; Hanaoka, Hirofumi*; Endo, Keigo*; Ishioka, Noriko

Nuclear Medicine and Biology, 36(6), p.587 - 590, 2009/09

 Times Cited Count:6 Percentile:22.69(Radiology, Nuclear Medicine & Medical Imaging)

Journal Articles

Assessment of $$^{186}$$Re chelate-conjugated bisphosphonate for the development of new radiopharmaceuticals for bones

Uehara, Tomoya*; Jin, Z. L.*; Ogawa, Kazuma*; Akizawa, Hiromichi*; Hashimoto, Kazuyuki; Nakayama, Morio*; Arano, Yasushi*

Nuclear Medicine and Biology, 34(1), p.79 - 87, 2007/01

 Times Cited Count:24 Percentile:56.53(Radiology, Nuclear Medicine & Medical Imaging)

In this study, a key factor affecting the pharmacokinetics of a chelate-conjugated BP was investigated to estimate the validity and the applicability of molecular design. Chemically inert and well-characterized [$$^{186}$$Re]CpTR-Gly was conjugated with 3-amino-1-hydroxypropylidene-1,1-bisphosphonate and purified by HPLC to prepare [$$^{186}$$Re]CpTR-Gly-APD. Plasma stability, plasma protein binding, hydroxyapatite (HA) binding and the pharmacokinetics of [$$^{186}$$Re]CpTR-Gly-APD were compared with those of $$^{186}$$Re 1-hydroxyethylidene-1,1-diphosphonate (HEDP). The HPLC-purified [$$^{186}$$Re]CpTR-Gly-APD showed higher plasma stability, higher HA binding, higher bone accumulation and lower plasma protein binding than did $$^{186}$$Re -HEDP. Although $$^{186}$$Re -HEDP possessed HA binding and bone accumulation similar to those of [$$^{186}$$Re]CpTR-Gly-APD, the specific activity of $$^{186}$$Re -labeled BPs was found to play a crucial role in bone accumulation and blood clearance. Thus, the molecular design of chelate-conjugated BP would be useful for the development of bone-seeking radiopharmaceuticals with a variety of radionuclides by selecting chelating molecules that provide high specific activities.

Journal Articles

Rhemium-186-monoaminemonoamidedithiol-conjugated bisphosphonate derivatives for bone pain palliation

Ogawa, Kazuma*; Mukai, Takahiro*; Arano, Yasushi*; Otaka, Akira*; Ueda, Masashi*; Uehara, Tomoya*; Magata, Yasuhiro*; Hashimoto, Kazuyuki; Saji, Hideo*

Nuclear Medicine and Biology, 33(4), p.513 - 520, 2006/05

 Times Cited Count:55 Percentile:80.1(Radiology, Nuclear Medicine & Medical Imaging)

To develop a radiopharmaceutical for the palliation of painful bone metastases based on the concept of bifunctional radiopharmaceuticals, we synthesized a bisphosphonate derivative labeled with rhenium-186 ($$^{186}$$Re) that contains a hydroxyl group at the central carbon of its bisphosphonate structure and attached a stable $$^{186}$$Re-MAMA chelate to the amino group of a 4-amino-butylidene-bisphosphonate derivative, $$^{186}$$Re-MAMA-HBP, and investigated the effect of a hydroxyl group at the central carbon of its bisphosphonate structure on the affinity for hydroxyapatite and biodistribution by conducting a comparative study with $$^{186}$$Re-MAMA-BP. $$^{186}$$Re-MAMA-HBP was prepared by a reaction with $$^{186}$$ReO$$_{4}$$$$^{-}$$ and SnCl$$_{2}$$ in citrate buffer after the deprotection of trityl groups of Tr-MAMA-HBP. After reversed phase HPLC, $$^{186}$$Re-MAMA-HBP had a radiochemical purity of over 95 %. Compared with $$^{186}$$Re-MAMA-BP, $$^{186}$$Re-MAMA-HBP showed a greater affinity for hydroxyapatite beads in vitro and accumulated a significantly higher level in the femur in vivo. Thus, the introduction of a hydroxyl group into $$^{186}$$Re complex-conjugated bisphosphonates would be effective in enhancing accumulation in bone. These findings provide useful information on the design of bone-seeking therapeutic radiopharmaceuticals.

Journal Articles

In vivo recognition of Cyclopentadienyltricarbonylrhenium (CpTR) derivatives

Uehara, Tomoya*; Koike, Miho*; Nakata, Hideo*; Miyamoto, Shigehiko*; Motoishi, Shoji; Hashimoto, Kazuyuki; Oku, Naoto*; Nakayama, Morio*; Arano, Yasushi*

Nuclear Medicine and Biology, 30(3), p.327 - 334, 2003/04

 Times Cited Count:20 Percentile:50.08(Radiology, Nuclear Medicine & Medical Imaging)

no abstracts in English

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