지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2013.3
- 수록면
- 21 - 25 (5page)
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초록· 키워드
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The selective targeting of an integrin α<SUB>v</SUB>β<SUB>3</SUB> receptor using radioligands may enable the assessment of angiogenesis and integrin α<SUB>v</SUB>β<SUB>3</SUB> receptor status in tumors. The aim of this research was to label a peptidomimetic integrin α<SUB>v</SUB>β<SUB>3</SUB> antagonist (PIA) with <SUP>99m</SUP>Tc(CO)<SUB>3</SUB> and to test its receptor targeting properties in nude mice bearing receptor-positive tumors. PIA was reacted with tris-succinimidyl aminotriacetate (TSAT) (20 mM) as a PIA per TSAT. The product, PIA-aminodiacetic acid (ADA), was radiolabeled with [<SUP>99m</SUP>Tc(CO)<SUB>3</SUB>(H<SUB>2</SUB>O)<SUB>3</SUB>]<SUP>+1</SUP>, and purified sequentially on a Sep-Pak C-18 cartridge followed by a Sep-Pak QMA anion exchange cartridge. Using gradient C-18 reverse-phase HPLC, the radiochemical purity of <SUP>99m</SUP>Tc(CO)<SUB>3</SUB>-ADA-PIA (retention time, 10.5 min) was confirmed to be > 95%. Biodistribution analysis was performed in nude mice (n = 5 per time point) bearing receptor-positive M21 human melanoma xenografts. The mice were administered <SUP>99m</SUP>Tc(CO)<SUB>3</SUB>-ADA-PIA intravenously. The animals were euthanized at 0.33, 1, and 2 hr after injection for the biodistribution study. A separate group of mice were also co-injected with 200 μg of PIA and euthanized at 1 hr to quantify tumor uptake. <SUP>99m</SUP>Tc(CO)<SUB>3</SUB>-ADA-PIA was stable in phosphate buffer for 21 hr, but at 3 and 6 hr, 7.9 and 11.5% of the radioactivity was lost as histidine, respectively. In tumor bearing mice, <SUP>99m</SUP>Tc(CO)<SUB>3</SUB>-ADA-PIA accumulated rapidly in a receptor-positive tumor with a peak uptake at 20 min, and rapid clearance from blood occurring primarily through the hepatobiliary system. At 20 min, the tumor-toblood ratio was 1.8. At 1 hr, the tumor uptake was 0.47% injected dose (ID)/g, but decreased to 0.12% ID/g when co-injected with an excess amount of PIA, indicating that accumulation was receptor mediated. These results demonstrate successful <SUP>99m</SUP>Tc labeling of a peptidomimetic integrin antagonist that accumulated in a tumor via receptor-specific binding. However, tumor uptake was very low because of low blood concentrations that likely resulted from rapid uptake of the agent into the hepatobiliary system. This study suggests that for <SUP>99m</SUP>Tc(CO)<SUB>3</SUB>-ADA-PIA to be useful as a tumor detection agent, it will be necessary to improve receptor binding affinity and increase the hydrophilicity of the product to minimize rapid hepatobiliary uptake.
목차
INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
REFERENCES
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UCI(KEPA) : I410-ECN-0101-2014-510-003159919