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Positron emission tomography and functional characterization of a complete PBR/TSPO knockout.

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2014

Nat Commun. 2014 Nov 19;5:5452. doi: 10.1038/ncomms6452.

Positron emission tomography and functional characterization of a complete PBR/TSPO knockout.

RB Banati;RJ Middleton;R Chan;CR Hatty;W Wai-Ying Kam;C Quin;MB Graeber;A Parmar;D Zahra;P Callaghan;S Fok;NR Howell;M Gregoire;A Szabo;T Pham;E Davis;GJ Liu

Life Sciences, Australian Nuclear Science and Technology Organisation, New South Wales 2232, Australia; Medical Imaging & Radiation Sciences, Faculty of Health Science and Brain & Mind Research Institute, The University of Sydney, Sydney, New South Wales 2

Service type: Knockout mice

Abstract

The evolutionarily conserved peripheral benzodiazepine receptor (PBR), or 18-kDa translocator protein (TSPO), is thought to be essential for cholesterol transport and steroidogenesis, and thus life. TSPO has been proposed as a biomarker of neuroinflammation and a new drug target in neurological diseases ranging from Alzheimer's disease to anxiety. Here we show that global C57BL/6-Tspo(tm1GuWu(GuwiyangWurra))-knockout mice are viable with normal growth, lifespan, cholesterol transport, blood pregnenolone concentration, protoporphyrin IX metabolism, fertility and behaviour. However, while the activation of microglia after neuronal injury appears to be unimpaired, microglia from (GuwiyangWurra)TSPO knockouts produce significantly less ATP, suggesting reduced metabolic activity. Using the isoquinoline PK11195, the ligand originally used for the pharmacological and structural characterization of the PBR/TSPO, and the imidazopyridines CLINDE and PBR111, we demonstrate the utility of (GuwiyangWurra)TSPO knockouts to provide robust data on drug specificity and selectivity, both in vitro and in vivo, as well as the mechanism of action of putative TSPO-targeting drugs.

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