Longitudinal imaging of Tau aggregates in vivo by two-photon imaging available in reMYND’s Tau.P301S model

Following disease progression reliably is a major challenge of Alzheimer’s research, much of which  is focused on imaging of Abeta or Tau aggregates. Neurotar and reMYND have been able to visualize and measure Tau aggregates directly in Tau.PS301S mice using two-photon microscopic imaging.

Two-photon imaging allows tracking the formation of Tau aggregates  in the same brain-region of a live animal over the course of time. This makes it possible to study the effects of treatment longitudinally in vivo. In addition to studying compounds’ efficacy on NFT-formation, this high resolution imaging technique also allows for advanced PK/PD studies with labelled antibodies in the cortex of Tau.P301S animals. In the course of such studies, it is possible to determine the exact location of the antibody relative to the location of Tau aggregates as well as to quantify the antibody turn-over.

: in vivo two-photon images of superficial cortex layers in a 5.5 month old Tau.P301S animal 24h following Methoxy-X04 injection (ip) are shown as an optical section (left) and as a 3D projection (middle and right). Labelled Tau aggregates are indicated with red arrows (left) or highlighted using purple pseudo-color (middle and right). Scalebar and grid: 50 μm.

Figure 1: in vivo two-photon images of superficial cortex layers in a 5.5 month old Tau.P301S animal 24h following Methoxy-X04 injection (ip) are shown as an optical section (left) and as a 3D projection (middle and right). Labelled Tau aggregates are indicated with red arrows (left) or highlighted using purple pseudo-color (middle and right). Scalebar and grid: 50 μm.

The Tau.P301S model features progressive hyperphosphorylation of Tau with ageing (Figure 2), which leads to a profound NFT-like pathology in the brainstem, spinal cord, cortex and hippocampus regions and to impaired Long Term Potentiation at 3 months of age.

AT100

Figure 2: AT100 (phospho Tau pT212/S214) reactive cells in cortex (n = 10 / group). Additional data available on request.

For more information or a confidential data package, please contact Robert de Jonge, CRO Manager.