Synthesis and preliminary evaluation of 9-(4-[18F]-fluoro-3-hydroxymethylbutyl)guanine ([18F]FHBG): a new potential imaging agent for viral infection and gene therapy using PET.

Abstract:

:Synthesis and preliminary biological evaluation of 9-(4-[18F]-fluoro-3-hydroxymethylbutyl)-guanine ([18F]FHBG) is reported. 9-(4-Hydroxy-3-hydroxymethylbutyl)-guanine (penciclovir) 4 was converted to 9-[N2, O-bis-(methoxytrityl)-3-(tosylmethybutyl)]guanine 7 by treatment with methoxytrityl chloride followed by tosylation. The tosylate 7 was reacted with either tetrabutylammonium fluoride or KF in the presence of kryptofix 2.2.2. to produce the 4-fluoro-N2-O-bis-(methoxytrityl) derivative 8. Removal of the methoxytrityl groups by acidic hydrolysis produced FHBG 5. Radiolabeled product [18F]FHBG was prepared by fluorination of the tosylate 7 with [18F]KF and kryptofix 2.2.2. The labeled product was isolated by HPLC purification on a reverse-phase C18 column, and eluted at 12 min with 15% acetonitrile in water at a flow rate of 2.25 mL/min. Radiochemical yield was 8.0-22.3% with an average of 12% in 7 runs (corrected for decay). Synthesis time was 90 to 100 min including HPLC purification with radiochemical purity >99%, and average specific activity of 320 mCi/micromol. In vitro studies of the compound in HT-29 colon cancer cells revealed 18.2-fold higher uptake into transduced cells compared to control in 3 h. The agent may be useful for imaging viral infection or transfected cells in gene therapy.

journal_name

Nucl Med Biol

authors

Alauddin MM,Conti PS

doi

10.1016/s0969-8051(97)00160-1

subject

Has Abstract

pub_date

1998-04-01 00:00:00

pages

175-80

issue

3

eissn

0969-8051

issn

1872-9614

pii

S0969-8051(97)00160-1

journal_volume

25

pub_type

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