fa Medical Biotechnology Medical Biotechnology مقاله کوتاه Short Communication <p><strong>Background: </strong>Insulin-degrading enzyme (IDE) is a conserved zinc metallopeptidase. Here, we have evaluated the effect of passage number and culture time on IDE expression and activity in colorectal adenocarcinoma cell line (Caco-2). <strong>Methods: </strong>Caco-2 cells were cultured with different passage ranges of 5-15, 25-35, 52-63 for 48, 72, and 120 hours. Subsequently, IDE expression and enzyme activity were assessed by Western blot analysis and fluorescent assay, respectively. <strong>Results: </strong>Our results confirmed that the amount of IDE was higher in cell extract compared to supernatant, and different passage numbers and culture times had small effect on IDE expression. However, when cells were cultured in the passage number range of 5-15 for 72 hours, the IDE activity was&nbsp;35% higher compared to other passage numbers (<em>p</em> < 0.05). <strong>Conclusion:</strong> The use of Caco-2 cells at passage number range of 5-15 and culture time of 72 hours provides proper conditions for IDE-related studies.</p> Metalloendopeptidase, Alzheimer Disease, Caco-2 cells 70 75 http://ibj.pasteur.ac.ir/browse.php?a_code=A-10-1-677&slc_lang=fa&sid=1 Taiebeh Mohammadi Farsani No Department of Medical Biotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran Elahe Motevaseli No Department of Molecular Medicine, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran Nadia Neyazi No Department of Medical Biotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, International Campus (TUMS- IC), 88 Italia St., Tehran, Iran Mohammad Reza Khorramizadeh No Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran. Department of Medical Biotechnology, School of Advanced technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran Elaheh Zafarvahedian No Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran Mohammad Hossein Ghahremani Yes Department of Pharmacology and Toxicology, Faculty of pharmacy, Tehran University of Medical Sciences, Tehran, Iran