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Last updated date: Feb 1, 2023 Views: 452 Forks: 0
MOUSE RETINA – IHC Cx36
Euthanasia / Fixation / Sectionning
Animals are euthanized by 100/10 mg/kg of K/X (IP) followed by cervical dislocation.
Eyes are rapidly removed and placed in 1X PBS (from 10X PBS, Fisher Scientific).
Eyes are opened (midline cut), either the posterior part of the eye (eyecup, used for sections) or the neural retina (whole-mounted retinas) is kept and rapidly fixed.
Fixation: 4% PFA/1X PBS for 2hrs (eyecup, sections) or for 30 min (whole-mounted retinas). Fixation must be done at room temperature (RT). Following fixation, keep the tissue overnight in PBS (1X) at 4℃ (fridge).
For sections with a cryotome: increase sucrose concentration in PBS (1X): 5%, 10%, 20%, 30% sucrose, at least 1h each, overnight for the last one (eyeballs must sink to the bottom of the recipient). Sections (20-um thick) are placed on slides. When all sections have been placed on a slide (up to 10), the slide is warmed for 30 min (in an hybridization oven) and then stored at -20℃, until processed for IHC.
For whole-mounted retinas or for floating 40-um thick sections cut with a microtome, keep the tissue in PBS (1X) at 4℃ until sectioned and/or processed.
Staining procedure (2-7 days)
Blocking step: take the slides out of the fridge/freezer and let them warm up to RT. Prepare the blocking solution.
Solutions: 1X PBS; 10% sodium azide (Na-az; in 1X PBS); normal donkey serum (NDS, from Jackson Immunoresearch); Triton-X100 (Tx)
Prepare 300 uL of blocking solution / slide (or per retina, floating sections and whole-mounts are placed in wells, in 48- or 96-well plates):
[blocking solution] = 0.2% Tx + 2.5% NDS + 0.1% Na-az + 1X PBS
[blocking solution / 300 uL] = 0.6 uL Tx + 7.5 uL NDS + 3 uL Na-az + 300 uL 1X PBS
Sequence of the steps:
Primary antibodies: Prepare 300 uL of solution / slide or retina, according to the following composition:
[primary Abs solution] = 0.2% Tx + 1% NDS + 0.1% Na-az + 1X PBS
[primary Abs solution / 300 uL] = 0.6 uL Tx + 3 uL NDS + 3 uL Na-az + 300 uL 1X PBS
Add primary Abs to the solution, for instance:
Anti-Cx36 monoclonal mouse (Chemicon, MAP3045; Loop) use 1:600
Anti-cArr polyclonal rabbit (Millipore, Ab15282) use 1:250
Anti-VGLUT1 polyclonal guinea pig (Synaptic Systems, 135304) use 1:3,000
5. Apply 300 uL / slide or retina, cover with parafilm (sections) or place in wells (wholemounts, floating sections) and incubate overnight (sections) or for 5 days (wholemounts) at RT
6. After incubation, delicately remove the parafilm, rinse the slides/tissue in 1 X PBS, 10 x 5 min (important step - do no speed it up!)
Secondary antibodies: Prepare 300 uL of solution / slide or retina, according to the following composition:
[secondary Abs solution] = 0.2% Tx + 1X PBS
[secondary Abs solution / 300 uL] = 0.6 uL Tx + 300 uL 1X PBS
Add secondary Abs to the solution, for instance:
Donkey-anti-mouse CY3 (IgG, JIR 715-165-150) use 1:600
Donkey-anti-rabbit Dylight488 (IgG, JIR 711-485-152) use 1:600
Donkey-anti-guinea pig (IgG, JIR 706-605-148) use 1:600
7. Apply 300 uL/slide, cover with parafilm (sections) or place in wells (wholemounts, floating sections) and incubate for 2h (sections) or 0.5-1 day (wholemounts) at RT IN THE DARK.
8. Rinse in 1X PBS, 3 x 10 min
9. Mount with coverslip, in medium with DAPI (Vector labs), 75-85 uL / slide, keep in the dark.
10. After 2 hrs, you can seal the coverslip with nail polish.
11. Wait until the nail polish is fully dry before imaging.
Tricks:
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