Indirect monitoring of endogenous gene expression by positron emission tomography (PET) imaging of reporter gene expression in transgenic mice.

Abstract:

PURPOSE:Repetitive imaging with microPET of endogenous albumin gene expression by using transgenic mice in which the Herpes Simplex Virus Type 1 thymidine kinase (HSV1-tk) reporter gene is driven by the albumin promoter (AL-HSV1-tk). METHODS:Transgenic mice were imaged repeatedly on a microPET scanner with approximately 200 microCi of 9-[4-[18F]fluoro-3-(hydroxymethyl)butyl]guanine (FHBG) (a substrate for HSV1-TK enzyme). Four transgenic mice were monitored for body weight, serum albumin, and imaged at the end of each of three dietary phases (17%, 0%, and 25% protein diet). Each phase last 14-21 days. The 0% protein diet has been reported previously to reduce albumin gene expression in rats. Twenty non-transgenic mice of the same strain followed a similar feeding schedule and were monitored for serum albumin, body weight, and sacrificed at various time points for determination of their GAPDH normalized albumin mRNA levels. RESULTS:Transgenic mice showed a relatively high FHBG signal from the liver region as expected. Variation of the mean FHBG signal in two mice with a fixed 17% protein diet over a four-month period was <19% s.d. The mean +/- s.e. FHBG liver standardized uptake value (SUV) in four transgenics went from 4.49 +/- 0.32 to 2.17 +/- 0.52 to 6.21 +/- 0.72 as the mice went through the three diets of 17%, 0%, and 25% sequentially. Non-transgenic mice showed GAPDH normalized albumin mRNA that went from 37.68 +/- 6.04 to 26.41 +/- 4.29 to 52.42 +/- 4.09. The FHBG SUV from transgenics was well correlated with GAPDH normalized albumin mRNA from non-transgenics (r(2) = 0.97) supporting that endogenous gene expression of albumin can be indirectly imaged with FHBG. CONCLUSION:Measuring correlated changes in albumin expression in wild type mice and HSV1-TK expression by microPET in transgenic mice in which the reporter gene is driven by the albumin promoter demonstrates that the HSV1-tk gene can be used to monitor, in living animals, modulated expression of transgenes.

journal_name

Mol Imaging Biol

authors

Green LA,Yap CS,Nguyen K,Barrio JR,Namavari M,Satyamurthy N,Phelps ME,Sandgren EP,Herschman HR,Gambhir SS

doi

10.1016/s1095-0397(01)00071-1

keywords:

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

71-81

issue

1

eissn

1536-1632

issn

1860-2002

pii

S1095039701000711

journal_volume

4

pub_type

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