2.6. Immunohistochemistry analysis
Paraffin sections (5 μm) of skins were deparaffinized and rehydrated in graded ethanol. Endogenous peroxidase activity was blocked with 3% hydrogen peroxide for 10 min. After being washed three times (5 min each) with phosphate-buffered saline (PBS, pH 7.4), the sections were incubated in 5% BSA diluted in PBS for 20 min to block the non-specific binding, then incubated with 1:70 diluted rabbit polyclonal antibodies against xCT overnight at 4 °C. After being washed in PBS, the sections were incubated in polymerized HRP-conjugated goat anti-rabbit second antibody (CWBIO, China) at 37 °C for 30 min. After being washed 3 times (5 min each) in PBS, immunoreactivity was visualized by incubating sections in the presence of 3, 3″-diaminobenzidine (Tiangen, China) substrate. The sections were counterstained with hematoxylin, dehydrated, clear sealed with neutral balsam. For negative controls, the slides were incubated overnight with non-immune bovine serum instead of the primary antibody.
2.6. Immunohistochemistry analysis
Paraffin sections (5 μm) of skins were deparaffinized and rehydrated in graded ethanol. Endogenous peroxidase activity was blocked with 3% hydrogen peroxide for 10 min. After being washed three times (5 min each) with phosphate-buffered saline (PBS, pH 7.4), the sections were incubated in 5% BSA diluted in PBS for 20 min to block the non-specific binding, then incubated with 1:70 diluted rabbit polyclonal antibodies against xCT overnight at 4 °C. After being washed in PBS, the sections were incubated in polymerized HRP-conjugated goat anti-rabbit second antibody (CWBIO, China) at 37 °C for 30 min. After being washed 3 times (5 min each) in PBS, immunoreactivity was visualized by incubating sections in the presence of 3, 3″-diaminobenzidine (Tiangen, China) substrate. The sections were counterstained with hematoxylin, dehydrated, clear sealed with neutral balsam. For negative controls, the slides were incubated overnight with non-immune bovine serum instead of the primary antibody.
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