• Macromolecular Research
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• 제11권5호
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• pp.382-386
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• 2003

Reductive amination of N-succinyl-chitosan (1) and lactose using sodium cyanoborohydride in 1/15 M phosphate buffer (pH 6.0) for 6 d was suitable for the preparation of lactosaminated N-succinyl-chitosan (2). At 8, 24 and 48 h after i.v. administration of fluorescently labeled 1 (1') or 2 (2'), Peyer's patch, mesenteric lymph nodes, testes, prostate, preputial grand, intestine (small intestine plus cecum), femoral muscle, backbone and peritoneum were taken. Peyer's patch and mesenteric lymph nodes were put together as lymph nodes. Over 10% of dose/g tissue was distributed to the prostate and lymph nodes at 48 h post-administration in both l' and 2'.2' was easily distributed into not only the liver but also prostate, intestine, preputial gland and lymph nodes. Although galactose receptors are known to exist not only on the liver parenchymal cells but also on prostate and testes, the selective distribution of 2' into the prostate and the testes were not observed clearly. This study suggested that 1 and 2 should have possibilities for both the prevention and cure of lymph node metastasis as drug carriers.

• 대한핵의학회지
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• 제32권1호
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• pp.50-60
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• 1998

국내에서 제조한 I-123-IPPA의 안정성 및 동물체내 분포와 대사, 그리고 SPECT 영상 분석 방법을 연구하였다. I-123-IPPA의 안정성을 보기 위하여 사람 및 랫트와 마우스 혈청과 반응시킨 후 1 시간 동안 관찰한 결과 I-123이 유리되지 않았다. 마우스에 I-123-IPPA 투여 후 장기를 적출 하여 본 체내 분포는 심장의 단위무게당 섭취는 5분에 14.5%ID/g 기관당 섭취는 1.9%ID/organ 이었다. 주사량 대비 심장 섭취율은 주사 60분에 처음의 1/4-1/6로 줄었다. 심근대 혈액 비와 심근 대 폐와 심근 대 간 섭취 비는 I-123-IPPA 투여 후 처음 5분까지 증가하다가 이후 계속 감소하였다. 랫트에 I-123-IPPA를 투여한 후 혈액과 소변 크로마토그라피에는 I-123-IPPA가 15-20분 후에 혈액이나 소변 중에 I-123-IPPA는 거의 남지 않고 여러 중간 물질이 되었다. 심근경색 실험견에 경색을 만들기 전과 후에 시행한 심근 동적 SPECT에서 정상 심근은 I-123-IPPA가 섭취되었다가 제거되는 모습으로, 경색 부위는 I-123-IPPA의 섭취 결손으로 보였다. 심근의 I-123-IPPA SPECT에 보이는 결손은 Tc-99m-MIBI SPECT와 F-18-FDG PET에 보이는 결손과 비슷하였다. 이상의 결과는 원자력병원 싸이클로트론 응용 연구실에서 제조한 I-123-IPPA가 심근 질환의 대사를 평가하는데 사용할 수 있음을 나타낸다.

• 대한핵의학회지
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• 제29권1호
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• pp.105-109
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• 1995

Tyrosine의 유도체인 [$^{123}I$]IMT를 각종 악성종양의 SPECT에 이용하기 위하여 표지시 반응조건과 뇌종양이식 백서에서의 체내 동태를 연구하여 다음과 같은 결과를 얻었다. AMT의 [$^{123}I$] 표지에 chloramine-T 보다 Iodobead를 이용하는 것이 훨씬 간편하고 수율이 높았으며, Iodobead 1개, AMT $200{\mu}g/100{\mu}L$ phosphate buffer, PH 5.5, 상온에서 7분간 반응시키는 것이 최적 반응조건이었다. 9L glioma 이식 백서 체내동태는 [$^{123}I$]IMT가 신장으로 배설됨과 체내에서 탈요오드 반응이 일어남이 추측되었고, 정상조직의 3배 방사능 섭취가 관찰되어, 각종 뇌종양의 진단 및 치료 후 경과 관찰에 이용 가능성이 보여 임상연구의 진행이 기대된다.

• 대한핵의학회:학술대회논문집
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• 대한핵의학회 2000년도 2nd Korea-China Congress of Nuclear Medicine and 39th Annual Spring Meeting if the Korea SOciety Nuclear Medicine
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• pp.72.2-72.2
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• 2000

• 대한핵의학회:학술대회논문집
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• 대한핵의학회 1997년도 제36차 춘계학술대회 초록집
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• pp.185-185
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• 1997

• 대한핵의학회:학술대회논문집
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• 대한핵의학회 2005년도 제44차 추계학술대회 및 총회
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• pp.322.1-322.1
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• 2005

• 대한핵의학회지
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• 제38권2호
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• pp.121-130
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• 2004

Molecular imaging visualizes cellular processes at a molecular or genetic level in living subjects, and diverse molecular probes are used for this purpose. Radiolabeling methods as well as radioisotopes are very important in preparation of molecular probes, because they can affect the biodistribution in tissues and the excretion route. In this review, the molecular probes are divided into small organic molecules and macromolecules such as peptides and proteins, and their commonly used radiolabeling methods are described.

• IMMUNE NETWORK
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• 제11권3호
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• pp.163-168
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• 2011

Background: Nanoparticles (NPs) prepared from biodegradable polymers, such as poly (D,L-lactic acid-co-glycolic acid) (PLGA), have been studied as vehicles for the delivery of antigens to phagocytes. This paper describes the preparation of antigen-loaded PLGA-NPs for efficient cross-priming. Methods: NPs containing a similar amount of ovalbumin (OVA) but different sizes were produced using a micromixer-based W/O/W solvent evaporation procedure, and the efficiency of the NPs to induce the cross-presentation of OVA peptides were examined in dendritic cells (DCs). Cellular uptake and biodistribution studies were performed using fluorescein isothiocyanate (FITC)-loaded NPs in mice. Results: The NPs in the range of $1.1{\sim}1.4{\mu}m$ in size were the most and almost equally efficient in inducing the cross-presentation of OVA peptides via $H-2K^b$ molecules. Cellular uptake and biodistribution studies showed that opsonization of the NPs with mouse IgG greatly increased the percentage of FITC-positive cells in the spleen and lymph nodes. The major cell type of FITC-positive cells in the spleen was macrophages, whereas that of lymph nodes was DCs. Conclusion: These results show that IgG-opsonized PLGA-NPs with a mean size of $1.1{\mu}m$ would be the choice of biodegradable carriers for the targeted-delivery of protein antigens for cross-priming in vivo.

• 대한핵의학회지
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• 제27권2호
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• pp.270-276
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• 1993

$Technetium-^{99m}$ labeling method using bifunctional chelating agent cyclic DTPA has been evaluated with human polyclonal nonspecific IgG. IgG was conjugated with cyclic DTPA with various molar ratio. Reduction of $^{99m}Tc$ was done with $Na_2S_2O_4$ with various molar excess. Labeling efficiency and identification of polymer was confirmed with HPLC using TSK4000 SW column. Polymer was purified with 100 cm Sepharose 6LB column. Cultured $1{\times}10^9$ Staphylococcus aureus were injected into rat thigh 24 hours later labeled IgG was injected, and in vivo distribution was observed 4 and 24 hours thereafter. Reduction of $^{99m}Tc$ was optimal with the 10000-50000 times molar excess of $Na_2S_2O_4$. Polymer formation increased with increasing mloar excess of cyclic DTPA to IgG. Three step labeling-labeling DTPA conjugated IgG after reduction of $^{99m}Tc$-made more polymer than two two step labeling-simultaneous mixing DTPA conjugated IgG, $^{99m}Tc$ and $Na_2S_2O_4$. $^{99m}Tc$ blood clearance and lower uptake in the abscess and other organs. IgG conjugated with 200 times molar excess of cyclic DTPA showed slower blood clearance with 200 times molar excess of cyclic DTPA showed slower blood clearance than that of 200 times molar excess of cyclic DTPA showed slower blood clearance than that of 20 times molar excess. In the $^{99m}Tc$ labeling of IgG with cyclic DTPA for the immunoscintigraphy, obtimal labeling condition should be chosen, and effect of the $^{99m}Tc$ labeled IgG polymer should be considered.

• Journal of Microbiology and Biotechnology
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• 제25권6호
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• pp.863-871
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• 2015

Bifidobacterium longum subsp. longum BBMN68, isolated from centenarians in Guangxi, China, has been proved to be a promising probiotic strain for its health benefits. In this study, the biodistribution of this strain in the rat gut was first investigated using the quantitative realtime PCR assay and propidium monoazide. Strain-specific primers were originally designed based on the BBMN68 genome sequence. Healthy rats were orally inoculated with either a single dose of BBMN68 (10¹⁰ colony-forming units/kg), or with one dose per day for 7 days and bacterial concentrations were analyzed in detail from the intestinal contents and feces of four different gut locations, including stomach, small intestine, colon, and rectum. Results indicated that strain BBMN68 could overcome the rigors of passage through the upper gastrointestinal tract and transiently accumulate in the colon, even though survival in the stomach and small intestine was not high. A good level of BBMN8 could stay in vivo for 72 h following a 7-day oral administration, and a daily administration is suggested for a considerable and continuous population of BBMN68 to be maintained in the host intestine.