GastroSense™ 750 (NEV11121)

IN VIVO IMAGING PROTOCOLPREPARING MICE FOR IMAGING
Animal hair is highly effective at blocking, absorbing, and scattering light during optical imaging.
Even light within the NIR spectrum, which typically shows minimal scattering and absorbance intissue, is significantly absorbed and scattered by hair.

Always remove the fur on and around the areas of the animal that are to be imaged. For quantitative
accuracy, continue this practice throughout the study. Remove all hair from mice when performing
3D imaging on IVIS or FMT.

Nude mice, or immunocompetent hairless SKH1-E mice, do not require depilation; howeverconventional strains of haired mice, like BALB/c or C57BL/6, require depilation.

2 weeks before the imaging study switch to low fluorescence mouse chow. Regular mouse chowcontains chlorophyll that auto-fluoresces around 700 nm and can interfere with signal collected fromthis agent.

PREPARING GastroSense 750Each vial contains 3 nmol (fluorophore) of GastroSense 750 as a dry solid form.

Add 1.2 mL of 1 x PBS to the vial and gently shake or vortex to ascertain the agent is in solution. A
methylcellulose solution may also be used or it may be reconstituted with a liquid diet supplementsolutionThis material provides sufficient reagent for imaging approximately 10 mice (weighing ~25 gramseach) when using the recommended dose of 0.250 nmol/100 μL of GastroSense 750 per mouse.

Once constituted in PBS the agent is stable for up to 10 days when stored at 2-8 ºC and protectedfrom light.

ANIMAL INJECTION AND IMAGING

Take a time-zero image of each subject before injection of the agent.

With fluorescent models, a naïve control is fundamental and will allow for easier differentiation of
signal from background, also facilitating advanced background subtraction features such as spectral
unmixing on IVIS platform.

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The imaging agent route of injection is an extremely important consideration when imaging
fluorescence. In general, NIR imaging agents are designed for intravenous injection and are not
optimized for injections by any other routes (e.g. intraperitoneal, intramuscular and subcutaneous).

Inject 100 l of GastroSense 750 by oral gavage into the mouse.

Image at various time points from 5 min to 3 hours post injection. It is recommended to do an initialtime course imaging study to determine the optimal imaging time for the experimental model.

The optimal re-injection time is 3-5 hours, which allows for the complete clearance of the agent fromthe mouse.

IVIS IMAGING

If using the 2D or epifluorescence feature of IVIS, animal positioning is important. Always place theanimal in a position where the source of light (fluorescent signal) is closest to the detector or, ifunknown, image both sides of the animal.

Filter Set selectionoIVIS Spectrum/Spectrum CT: 745 ex/800 emoIVIS Lumina: 745 ex/ICG em (standard Lumina filter set) or 745 ex/800 em (optional 700series filter)If multiple animals are imaged at the same time use guards between animals to prevent signal
contamination from neighboring animals.



For imaging studies where signal is at depth (e.g. lungs, heart etc.) use trans-illumination or 3D
tomography (FLIT), available on IVIS Spectrum and IVIS Spectrum CT.

For further information on trans-illumination or FLIT please refer to tech notes under the help tab of
the Living Image (LI) software

FMT IMAGING
1. Animal positioning within the animal imaging cassette is very important. Over the course of a study,always maintain consistency with animal positioning.
2. Use the height adjustment knobs on the cassette to make sure that the animal is gently but securelycompressed. The animal should be flat against both windows of the imaging cassette.
3. When sliding the cassette into the docking station always orient the cassette such that thefluorescent signal is closest to the camera or, if unknown, image both sides of the animal.
4. When setting up a scan with TrueQuant software be sure to draw the scan region sufficiently large
so that tissue surrounding the anticipated area of fluorescence is captured. Ideally, aim for a total of
30 to 50 scan points with at least 2-3 scan points surrounding (on all sides) the anticipated area offluorescence. If necessary you can change the spacing between adjacent scan points (the sourcedensity) using the Advanced Scan Settings.
5. Laser channel selection:
6. The correct laser channel should be properly pre-selected based on the experimental design youhad previously set up in the Experiment Tab.
7. For GastroSense 750, verify that the ‘Ch 750’ laser channel is selected

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