SFRP4 Antibody [K23D16]

N° de catalogue F2563

Imprimer

Description biologique

Spécificité

SFRP4 Antibody [K23D16] reconnaît les niveaux endogènes de protéine SFRP4 totale.
Contexte

La protéine 4 apparentée à Frizzled sécrétée (sFRP4) est une glycoprotéine soluble qui joue un rôle essentiel dans la modulation de la voie de signalisation Wnt, cruciale pour la prolifération, la différenciation et l'apoptose cellulaires. Structurellement, la sFRP4 est constituée d'un domaine riche en cystéine (CRD) responsable de la liaison aux protéines Wnt et d'un domaine C-terminal (CTD) qui stabilise sa structure et améliore son affinité de liaison aux ligands Wnt. Ce CRD permet à la sFRP4 d'antagoniser la signalisation Wnt en empêchant les protéines Wnt d'interagir avec les récepteurs Frizzled à la surface des cellules, inhibant ainsi l'activation en aval de voies telles que Wnt/β-caténine. Bien que son rôle principal soit d'agir comme antagoniste de la signalisation Wnt, la fonction de la sFRP4 peut être dépendante du contexte, soit en inhibant, soit en potentialisant l'activité Wnt. Elle est impliquée dans de multiples troubles tels que le cancer, où elle supprime la croissance tumorale, et dans des maladies métaboliques comme le diabète de type 2, où son expression perturbe la sensibilité à l'insuline. Elle régule également l'apoptose, le développement tissulaire et l'homéostasie cellulaire. Elle est également impliquée dans des troubles métaboliques tels que le diabète de type 2, où elle joue un rôle dans la réduction de la sensibilité à l'insuline, ainsi que dans des affections comme le psoriasis, la fibrose rénale et les maladies osseuses.

Informations dutilisation

Application IHC, IF, FCM Dilution
IHC IF FCM
1:50 1:200 1:50
Réactivité Human, Mouse
Source Rabbit Monoclonal Antibody MW
Tampon de stockage PBS, pH 7.2+50% Glycerol+0.05% BSA+0.01% NaN₃
Stockage
(À partir de la date de réception)		 -20°C (avoid freeze-thaw cycles), 2 years
IF
Experimental Protocol:
 
Sample Preparation
1. Adherent Cells: Place a clean, sterile coverslip in a culture dish. Once the cells grow to near confluence as a monolayer, remove the coverslip for further use.
2. Suspension Cells: Seed the cells onto a clean, sterile slide coated with poly-L-lysine.
3. Frozen Sections: Allow the slide to thaw at room temperature. Wash it with pure water or PBS for 2 times, 3 minutes each time.
4. Paraffin Sections: Deparaffinization and rehydration. Wash the slide with pure water or PBS for 3 times, 3 minutes each time. Then perform antigen retrieval.
 
Fixation
1. Fix the cell coverslips/spots or tissue sections at room temperature using a fixative such as 4% paraformaldehyde (4% PFA) for 10-15 minutes.
2. Wash the sample with PBS for 3 times, 3 minutes each time.
 
Permeabilization
1.Add a detergent such as 0.1–0.3% Triton X-100 to the sample and incubate at room temperature for 10–20 minutes.
(Note: This step is only required for intracellular antigens. For antigens expressed on the cell membrane, this step is unnecessary.)
Wash the sample with PBS for 3 times, 3 minutes each time.
 
Blocking
Add blocking solution and incubate at room temperature for at least 1 hour. (Common blocking solutions include: serum from the same source as the secondary antibody, BSA, or goat serum.)
Note: Ensure the sample remains moist during and after the blocking step to prevent drying, which can lead to high background.
 
Immunofluorescence Staining (Day 1)
1. Remove the blocking solution and add the diluted primary antibody.
2. Incubate the sample in a humidified chamber at 4°C overnight.
 
Immunofluorescence Staining (Day 2)
1. Remove the primary antibody and wash with PBST for 3 times, 5 minutes each time.
2. Add the diluted fluorescent secondary antibody and incubate in the dark at 4°C for 1–2 hours.
3. Remove the secondary antibody and wash with PBST for 3 times, 5 minutes each time.
4. Add diluted DAPI and incubate at room temperature in the dark for 5–10 minutes.
5. Wash with PBST for 3 times, 5 minutes each time.
 
Mounting
1. Mount the sample with an anti-fade mounting medium.
2. Allow the slide to dry at room temperature overnight in the dark.
3. Store the slide in a slide storage box at 4°C, protected from light.
IHC
Experimental Protocol：
 
Deparaffinization/Rehydration
1. Deparaffinize/hydrate sections:
2. Incubate sections in three washes of xylene for 5 min each.
3. Incubate sections in two washes of 100% ethanol for 10 min each.
4. Incubate sections in two washes of 95% ethanol for 10 min each.
5. Wash sections two times in dH2O for 5 min each.
6.Antigen retrieval: For Citrate: Heat slides in a microwave submersed in 1X citrate unmasking solution until boiling is initiated; continue with 10 min at a sub-boiling temperature (95°-98°C). Cool slides on bench top for 30 min.
 
Staining
1. Wash sections in dH2O three times for 5 min each.
2. Incubate sections in 3% hydrogen peroxide for 10 min.
3. Wash sections in dH2O two times for 5 min each.
4. Wash sections in wash buffer for 5 min.
5. Block each section with 100–400 µl of blocking solution for 1 hr at room temperature.
6. Remove blocking solution and add 100–400 µl primary antibody diluent in to each section. Incubate overnight at 4°C.
7. Remove antibody solution and wash sections with wash buffer three times for 5 min each.
8. Cover section with 1–3 drops HRPas needed. Incubate in a humidified chamber for 30 min at room temperature.
9. Wash sections three times with wash buffer for 5 min each.
10. Add DAB Chromogen Concentrate to DAB Diluent and mix well before use.
11. Apply 100–400 µl DAB to each section and monitor closely. 1–10 min generally provides an acceptable staining intensity.
12. Immerse slides in dH2O.
13. If desired, counterstain sections with hematoxylin.
14. Wash sections in dH2O two times for 5 min each.
15. Dehydrate sections: Incubate sections in 95% ethanol two times for 10 sec each; Repeat in 100% ethanol, incubating sections two times for 10 sec each; Repeat in xylene, incubating sections two times for 10 sec each.
16. Mount sections with coverslips and mounting medium.
 

Références

  • https://pubmed.ncbi.nlm.nih.gov/29360572/

Données dapplication

IHC

Validé par Selleck

  • f2563-IHC1
    Immunohistochemical analysis of formalin fixed paraffin embedded mouse intestine tissue with F2563 at 1:50 dilution.

IF

Validé par Selleck

  • F2563-IF
    Immunofluorescent analysis of Raw264.7 cells using F2563 (green, 1:200), Hoechst (blue) and tubulin (Red).