Fixation and immunocytochemistry (fluorescence) in PFF-treated cultures

Maria Iuliano

Published: 2024-06-18 DOI: 10.17504/protocols.io.x54v922q4l3e/v1

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Abstract

This protocol outlines methods used for the preparation of in vitro models for fluorescent imaging including primary rat and mouse hippocampal cultures treated with PFFs.

Before start

Please read safety guidelines ahead of working with PFFs

Steps

Fixation and Immunocytochemistry (Fluorescence)

1.

In a cell culture hood remove media and wash briefly with 1x PBS.

Safety information
Collect media and first wash as PFF waste for inactivation. Once in fixative, plate(s) can be moved to benchtop.

2.

20rpm Fix using 4% PFA 4% sucrose in 1xPBS with gentle rocking/shaking.

Note
Check whether the antibodies you intend to use require specific fixation. Optimization may be needed.

3.

20-30rpm Wash 1x PBS. Repeat 3 times.

Note
Pause Point: Coverslips can be stored after fixation for up to 2 weeks (or maybe more), though immediate processing is ideal. Store at 4C away from light, with the plate wrapped in parafilm to reduce evaporation.

4.

20-30rpm Block in blocking buffer (5% NGS, 0.3% Triton-X in 1x PBS)

5.

20rpm Incubate in solution containing primary antibodies diluted in 5% NGS in 1x PBS

Note
Antibodies

6.

20-30rpm Wash 1x PBS. Repeat 3 times.

7.

20rpm Incubate in solution containing secondary antibodies diluted in 5% NGS in 1x PBS

Note
Secondary incubation can vary (up to O/N), but typically 2-3hr at 4C works well. 1hr at RT can also work, though it may result in excess background signal, depending on the antibodyTypically, we use Alexa Fluor secondaries from Life Technologies, except for anti-chicken CF 405 (Millipore SAB4600466).

8.

20-30rpm Wash 1x PBS. Repeat 3 times.

9.

Mount coverslips onto microscope slides using or preferred mounting medium.

10.

Let cure 48h 0m 0s before imaging

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