- MA5-13144 - Invitrogen Antibodies KRT19 antibody

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Chen HK, Wu YT, Lin YJ, Lin JW
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Novel immunofluorescence protocol for multimarker assessment of putative disseminating breast cancer stem cells.

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Supportive validation

Submitted by: Invitrogen Antibodies (provider)
Main image
Experimental details: Western blot analysis of Cytokeratin Low Molecular Weight was performed by loading 25 µg of HepG2 (Lane 1), MCF-7 (Lane 2) and NIH-3T3 (Lane 3) cell lysates onto an SDS polyacrylamide gel. Proteins were transferred to a PVDF membrane and blocked at 4ºC overnight. The membrane was probed with a Cytokeratin Low Molecular Weight monoclonal antibody (Product # MA5-13144) at a dilution of 1:4000 (HepG2 and MCF-7) and 1:1000 (NIH-3T3) overnight at 4°C, washed in TBST, and probed with an HRP-conjugated secondary antibody for 1 hr at room temperature in the dark. Chemiluminescent detection was performed using Pierce ECL Plus Western Blotting Substrate (Product # 32132). Results show a band at approx. 40 kDa.

Supportive validation

Submitted by: Invitrogen Antibodies (provider)
Main image
Experimental details: Western blot analysis was performed on whole cell extracts (30 µg lysate) of A549 (Lane 1), PC-3 (Lane 2), HeLa (Lane 3), MCF7 (Lane 4), A-431 (Lane 5), Hep G2 (Lane 6), T-47D (Lane 7), Caco-2 (Lane 8) and HCT 116 (Lane 9). The blots were probed with Anti-Cytokeratin 8/18 (Cytokeratin Low Molecular Weight) Monoclonal Antibody (Product # MA5-13144, 1:2000 dilution) and detected by chemiluminescence using Goat anti-Mouse IgG (H+L) Superclonal™ Secondary Antibody, HRP conjugate (Product # A28177, 0.25 µg/mL, 1:4000 dilution). A 40 kDa, 45 kDa and 52 kDa band corresponding to Cytokeratin low molecular weight were observed across the cell lines tested. Known quantity of protein samples were electrophoresed using Novex® NuPAGE® 4-12 % Bis-Tris gel (Product # NP0321BOX), XCell SureLock™ Electrophoresis System (Product # EI0002) and Novex® Sharp Pre-Stained Protein Standard (Product # LC5800). Resolved proteins were then transferred onto a nitrocellulose membrane with iBlot® 2 Dry Blotting System (Product # IB21001). The membrane was probed with the relevant primary antibody following blocking with 5 % skimmed milk. Chemiluminescent detection was performed using Pierce™ ECL Western Blotting Substrate (Product # 32106).

Supportive validation

Submitted by: Invitrogen Antibodies (provider)
Main image
Experimental details: Immunofluorescent analysis of Cytokeratin Low Molecular Weight (green) showing staining in the cytoplasm of HepG2 cells. Formalin-fixed cells were permeabilized with 0.1% Triton X-100 in TBS for 5-10 minutes and blocked with 3% BSA-PBS for 30 minutes at room temperature. Cells were probed with a Cytokeratin Low Molecular Weight monoclonal antibody (Product # MA5-13144) in 3% BSA-PBS at a dilution of 1:200 and incubated overnight at 4 ºC in a humidified chamber. Cells were washed with PBST and incubated with a DyLight-conjugated secondary antibody in PBS at room temperature in the dark. F-actin (red) was stained with a fluorescent red phalloidin and nuclei (blue) were stained with Hoechst or DAPI. Images were taken at a magnification of 60x.

Supportive validation

Submitted by: Invitrogen Antibodies (provider)
Main image
Experimental details: Immunofluorescent analysis of Cytokeratin Low Molecular Weight (green) showing staining in the cytoplasm of MCF-7 cells. Formalin-fixed cells were permeabilized with 0.1% Triton X-100 in TBS for 5-10 minutes and blocked with 3% BSA-PBS for 30 minutes at room temperature. Cells were probed with a Cytokeratin Low Molecular Weight monoclonal antibody (Product # MA5-13144) in 3% BSA-PBS at a dilution of 1:200 and incubated overnight at 4 ºC in a humidified chamber. Cells were washed with PBST and incubated with a DyLight-conjugated secondary antibody in PBS at room temperature in the dark. F-actin (red) was stained with a fluorescent red phalloidin and nuclei (blue) were stained with Hoechst or DAPI. Images were taken at a magnification of 60x.

Supportive validation

Submitted by: Invitrogen Antibodies (provider)
Main image
Experimental details: Immunofluorescence analysis of Cytokeratin Low Molecular Weight was performed using 70% confluent log phase MCF7 cells. The cells were fixed with 4% paraformaldehyde for 10 minutes, permeabilized with 0.1% Triton™ X-100 for 10 minutes, and blocked with 1% BSA for 1 hour at room temperature. The cells were labeled with Cytokeratin 8/18 Monoclonal Antibody (Product # MA5-13144) at 5µg/mL in 0.1% BSA and incubated for 3 hours at room temperature and then labeled with Goat anti-Mouse IgG (H+L) Superclonal™ Secondary Antibody, Alexa Fluor® 488 conjugate (Product # A28175) at a dilution of 1:2000 for 45 minutes at room temperature (Panel a: green). Nuclei (Panel b: blue) were stained with SlowFade® Gold Antifade Mountant with DAPI (Product # S36938). F-actin (Panel c: red) was stained with Rhodamine Phalloidin (Product # R415, 1:300). Panel d represents the merged image showing cytoplasmic localization. Panel e shows the no primary antibody control. The images were captured at 60X magnification.

Supportive validation

Submitted by: Invitrogen Antibodies (provider)
Main image
Experimental details: Formalin-fixed, paraffin-embedded human squamous cell carcinoma of lung stained with Keratin, LMW antibody using peroxidase-conjugate and AEC chromogen. Note cytoplasmic staining of tumor cells.

Supportive validation

Submitted by: Invitrogen Antibodies (provider)
Main image
Experimental details: Formalin-fixed, paraffin-embedded human squamous cell carcinoma of lung stained with Keratin, LMW antibody using peroxidase-conjugate and AEC chromogen. Note cytoplasmic staining of tumor cells.

Supportive validation

Submitted by: Invitrogen Antibodies (provider)
Main image
Experimental details: Immunohistochemistry analysis of Cytokeratin Low Molecular Weight showing positive staining in the cytoplasm of paraffin-treated Human colon tissue (right) compared with a negative control in the absence of primary antibody (left). To expose target proteins, antigen retrieval method was performed using 10mM sodium citrate (pH 6.0), microwaved for 8-15 min. Following antigen retrieval, tissues were blocked in 3% H2O2-methanol for 15 min at room temperature, washed with ddH2O and PBS, and then probed with a Cytokeratin Low Molecular Weight monoclonal antibody (Product # MA5-13144) diluted by 3% BSA-PBS at a dilution of 1:200 overnight at 4°C in a humidified chamber. Tissues were washed extensively PBST and detection was performed using an HRP-conjugated secondary antibody followed by colorimetric detection using a DAB kit. Tissues were counterstained with hematoxylin and dehydrated with ethanol and xylene to prep for mounting.

Supportive validation

Submitted by: Invitrogen Antibodies (provider)
Main image
Experimental details: Immunohistochemistry analysis of Cytokeratin Low Molecular Weight showing positive staining in the cytoplasm of paraffin-treated Human skin tissue (right) compared with a negative control in the absence of primary antibody (left). To expose target proteins, antigen retrieval method was performed using 10mM sodium citrate (pH 6.0), microwaved for 8-15 min. Following antigen retrieval, tissues were blocked in 3% H2O2-methanol for 15 min at room temperature, washed with ddH2O and PBS, and then probed with a Cytokeratin Low Molecular Weight monoclonal antibody (Product # MA5-13144) diluted by 3% BSA-PBS at a dilution of 1:200 overnight at 4°C in a humidified chamber. Tissues were washed extensively PBST and detection was performed using an HRP-conjugated secondary antibody followed by colorimetric detection using a DAB kit. Tissues were counterstained with hematoxylin and dehydrated with ethanol and xylene to prep for mounting.

MA5-13144

Antibody data