カテプシンかてぷしんMeanings1nouncathepsinA type of protease enzyme found in lysosomes, involved in protein degradation. Used in biochemistry and medical contexts.カテプシンはリソソーム内ないでタンパク質しつを分ぶん解かいする酵こう素そです。Cathepsin is an enzyme that breaks down proteins inside lysosomes.