Journal: Frontiers in Immunology
Article Title: Natural Killer Cells from the Subcutaneous Adipose Tissue Underexpress the NKp30 and NKp44 in Obese Persons and Are Less Active against Major Histocompatibility Complex Class I Non-Expressing Neoplastic Cells
doi: 10.3389/fimmu.2017.01486
Figure Lengend Snippet: The cytotoxicity assay of ADNKs vs PBNKs on the SK-N-SH and CHLA-255 neuroblastoma cell lines in the 1:1, 3:1, and 5:1 ratios (A) . Granzyme degranulation marker CD107a expression of natural killer cells (NKs) before (left side) and after (right side) NB cell stimulation was measured. It shows a significant correlation between degranulation amounts of ADNKs of the study groups ( p = 0.005). The profiles show CD107a surface staining of lysosomal proteins (sideward scatter), as indicated on CD3 − CD56 + (forward scatter) NK cells. The percentage of CD107a + cells (up right), CD56 + cells (down right), and CD3 + , CD4 + cells (left side) is indicated on each plot (B) . The data show the expanded NKs after stimulation with IL-21 can induce activation signaling to PBNKs and ADNKs. ELISA data have shown no changes in cytokine production in the absence of any stimulation on NK cells (C) but there is a decreased level of both interferon gamma (IFNγ) and tumor necrosis factor alpha (TNFα) in ADNKs when compared to the normal PBNKs (D) . All data were statistically significant ( p < 0.05, each experiment was performed in triplicate). PBNKs, peripheral blood-derived NK cells; ADNKs, adipose tissue-derived NK cells.
Article Snippet: The human neuroblastoma (NB) cell lines of SK-NSH (ATCC-HTB11TM) and CHLA255 (DSMZ-Germany), both were negative for MHC-I have been used in this study.
Techniques: Cytotoxicity Assay, Marker, Expressing, Cell Stimulation, Staining, Activation Assay, Enzyme-linked Immunosorbent Assay, Derivative Assay