Role of ADAM10 and ADAM17 in CD16b shedding mediated by different stimulators.
- Author:
Sha GUO
1
;
Min PENG
;
Qing ZHAO
;
Wei ZHANG
Author Information
- Publication Type:Journal Article
- MeSH: ADAM Proteins; genetics; metabolism; physiology; ADAM10 Protein; ADAM17 Protein; Amyloid Precursor Protein Secretases; genetics; metabolism; physiology; Calcium Ionophores; pharmacology; Carcinogens; pharmacology; Cells, Cultured; Drug Evaluation, Preclinical; GPI-Linked Proteins; metabolism; Gene Knockdown Techniques; HEK293 Cells; Humans; Ionomycin; pharmacology; Membrane Proteins; genetics; metabolism; physiology; Protein Processing, Post-Translational; drug effects; Protein Transport; drug effects; Proteolysis; drug effects; Receptors, IgG; metabolism; Tetradecanoylphorbol Acetate; pharmacology; Transfection
- From: Chinese Medical Sciences Journal 2012;27(2):73-79
- CountryChina
- Language:English
-
Abstract:
OBJECTIVETo investigate the main proteinases responsible for CD16b shedding under different stimulators.
METHODSHEK293 cell line stably expressing CD16b was constructed by lentivirus system. The cell line was then overexpressed with a disintegrin and metalloproteinase 10 (ADAM10) or ADAM17, suppressed with short hairpin RNA of ADAM10 or ADAM17, and reconstituted with ADAM10 or ADAM17, respectively. After each treatment, the cell line was stimulated with ionomycin or phorbol 12-myristate- 13-acetate (PMA) for 12 hours. The soluble CD16b released from cell membrane was detected by immunoprecipition and immunoblot. Quantitation was then implemented to compare the amount of soluble CD16b in cell supernatant after stimulation.
RESULTSHEK293 cell line stably expressing CD16b was successfully established. When CD16b expressing cell line was overexpressed with ADAM10, shedding of CD16b was increased after stimulation with ionomycin but not PMA; when the cell line overexpressed with ADAM17, shedding of CD16b was increased after stimulation with PMA but not ionomycin. Similarly, when ADAM10 was suppressed by short hairpin RNA, CD16b shedding was decreased after stimulation with ionomycin; when ADAM17 was suppressed by short hairpin RNA, CD16b shedding was decreased after stimulation with PMA. The shedding of CD16b was increased again when CD16b expressing cell line was reconstituted with ADAM10 and stimulated by ionomycin or reconstituted with ADAM17 and stimulated by PMA.
CONCLUSIONSBoth ADAM10 and ADAM17 could shed CD16b, but they possess differed preferences. ADAM10 is the main sheddase under stimulation of ionomycin, while ADAM17 is the main sheddase under stimulation of PMA.
