Immunofluorescence- NKX2.1, SCGB1A1,  TUBA1A

Purpose: Stain slides of 7µm frozen sections of C57BL/6J E18.5 NKX2.1, SCGB1A1, and TUBA1A with antigen retrieval. 

Day 1

1. For Frozen tissue, rinse 2X in PBS, then 5 min in 4% PFA/PBS, then rinse 1X in PBS.
2. Antigen retrieval, pH 6.0 (times will vary according to microwave). Briefly equilibrate slides in Antigen Retrieval Buffer.
3. 10 mM sodium citrate, pH 6.0, and heat in a microwave at 96^oC. *We usually do a series of three runs (6-7 minutes each run) to equal the time/temp because of evaporation (refill coplin jars with dH₂O).
4. Microwave according to instructions on microwave.
5. Cool on counter top, 15 min.
6. Rinse with dH₂O.
7. 1X PBS, 5 min.
8. Block in 4% Goat serum/PBS-T, 2 hours at RT.
9. For Rabbit anti-NKX2.1 (R1231) dilute 1:1000. For guinea pig anti-SCGB1A1 (G210, Bl. 3/24/11) dilute 1:1500, for mouse anti- TUBA1A (T7451, Sigma) dilute 1:1000 in blocking buffer. Spin down in µfuge for 10 min, apply to tissue and incubate on tissue overnight @ 4^oC.

Day 2

1. Rinse slides in PBS-T 3X, 5 min.
2. Apply secondary antibody, Goat Alexa Fluor 488 anti-rabbit IgG (A11034, Lot# 1298480, for anti-1), Goat Alexa Fluor 555 anti-guinea pig IgG (A21435, Lot# 1235796, anti-SCGB1A1) at 1:200 in blocking buffer Donkey Alexa Fluor 647 anti-mouse IgG (A31571, Lot# 1549801, anti-TUBA1A (T7451, Sigma)) at 1:200, in blocking buffer. Spin down in µfuge for 10 min, apply to tissue and incubated at room temperature for 1 hour.
3. Rinse in PBS-T 3X, 5 min.
4. Dilute DAPI 1:2000 and apply to slides for 15 min.
5. Wash in PBS-T 3X, 5 min.
6. Rinse slides in 0.1M PB or TB, 3X, 5 min.
7. Add 1 drop of Prolong Gold anti-fade mounting medium (P36930).
8. Coverslip with Gold Seal Coverslip (Cat# 3422 Electron Microscopy Sciences, 22 X 22 mm).
9. Allow Prolong Gold to cure overnight at room temp in light sealed box.
10. Store slides in a light sealed box @ 4^oC.

Tissue Used: 

LMM.14.27.6.63 E18.5

Gender: Male

Crown-to-Rump Length: 21.0 mm

Weight=1.32g

Appendix

Antigen Retrieval Solution

18ml Solution A- 0.1M Citric Acid (Sigma, C1909) pH 2.5

82ml Reagent B- 0.1M Sodium Citrate (Sigma, S4641 ) pH 8.2

1L dH₂O

pH 6.0