Linked Life Data

18491928

Source:http://linkedlifedata.com/resource/pubmed/id/18491928

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2008-6-18
pubmed:abstractText
In this report, we present the synthesis and evaluation of the (99m)Tc-labeled beta-Ala-BN(7-14)NH2 (ABN = beta-Ala-Gln-Trp-Ala-Val-Gly-His-Leu-Met-NH2) as a new radiotracer for tumor imaging in the BALB/c nude mice bearing HT-29 human colon cancer xenografts. The gastrin releasing peptide receptor binding affinity of ABN and HYNIC-ABN (6-hydrazinonicotinamide) was assessed via a competitive displacement of (125)I-[Tyr4]BBN bound to the PC-3 human prostate carcinoma cells. The IC 50 values were calculated to be 24 +/- 2 nM and 38 +/- 1 nM for ABN and HYNIC-ABN, respectively. HYNIC is the bifunctional coupling agent for (99m)Tc-labeling, while tricine and TPPTS (trisodium triphenylphosphine-3,3',3''-trisulfonate) are used as coligands to prepare the ternary ligand complex [(99m)Tc(HYNIC-ABN)(tricine)(TPPTS)] in very high yield and high specific activity. Because of its high hydrophilicity (log P = -2.39 +/- 0.06), [(99m)Tc(HYNIC-ABN)(tricine)(TPPS)] was excreted mainly through the renal route with little radioactivity accumulation in the liver, lungs, stomach, and gastrointestinal tract. The tumor uptake at 30 min postinjection (p.i.) was 1.59 +/- 0.23%ID/g with a steady tumor washout over the 4 h study period. As a result, it had the best T/ B ratios in the blood (2.37 +/- 0.68), liver (1.69 +/- 0.41), and muscle (11.17 +/- 3.32) at 1 h p.i. Most of the injected radioactivity was found in the urine sample at 1 h p.i., and there was no intact [(99m)Tc(HYNIC-ABN)(tricine)(TPPTS)] detectable in the urine, kidney, and liver samples. Its metabolic instability may contribute to its rapid clearance from the liver, lungs, and stomach. Despite the steady radioactivity washout, the tumors could be clearly visualized in planar images of the BALB/c nude mice bearing the HT-29 human colon xenografts at 1 and 4 h p.i. The favorable excretion kinetics from the liver, lungs, stomach, and gastrointestinal tract makes [(99m)Tc(HYNIC-ABN)(tricine)(TPPTS)] a promising SPECT radiotracer for imaging colon cancer.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1520-4812
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
19
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1170-8
pubmed:meshHeading
pubmed-meshheading:18491928-Amino Acid Sequence, pubmed-meshheading:18491928-Animals, pubmed-meshheading:18491928-Bombesin, pubmed-meshheading:18491928-Colonic Neoplasms, pubmed-meshheading:18491928-Cross-Linking Reagents, pubmed-meshheading:18491928-Gastrin-Releasing Peptide, pubmed-meshheading:18491928-HT29 Cells, pubmed-meshheading:18491928-Humans, pubmed-meshheading:18491928-Kinetics, pubmed-meshheading:18491928-Ligands, pubmed-meshheading:18491928-Mice, pubmed-meshheading:18491928-Mice, Inbred BALB C, pubmed-meshheading:18491928-Niacin, pubmed-meshheading:18491928-Organotechnetium Compounds, pubmed-meshheading:18491928-Radiochemistry, pubmed-meshheading:18491928-Tissue Distribution, pubmed-meshheading:18491928-Tomography, Emission-Computed, Single-Photon, pubmed-meshheading:18491928-Transplantation, Heterologous
pubmed:year
2008
pubmed:articleTitle
99mTc-labeled bombesin(7-14)NH2 with favorable properties for SPECT imaging of colon cancer.
pubmed:affiliation
Medical Isotopes Research Center, Peking University, Beijing 100083, China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural