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In clinical trials, certain HCPs (e.g., PLBL2 or CCL2) that co\u2010purify with the therapeutic protein have been associated with immune reactions in patients. In this study, we examined the adjuvant potential of six commonly detected HCPs from CHO cells (PRDX1, S100A4, PLBL2, CCL2, CLU, and YWHAE) using an in vitro dendritic cell (DC) maturation assay. Recombinant HCPs were expressed in CHO cells to mimic manufacturing conditions. PRDX1, S100A4, and PLBL2 caused a slight increase in the expression of maturation markers on DCs, while YWHAE, CLU, and CCL2 did not. Interestingly, CLU and CCL2 reduced the DC maturation induced by rituximab. In addition, we observed that process parameters such as elution conditions during chromatographic purification can influence HCP aggregation, which in turn can mask or enhance the intrinsic adjuvant potential of an HCP. These findings not only provide initial insights into the adjuvant potential of individual HCPs but also indicate that the quantity as well as the degree of aggregation of HCPs might influence adjuvanticity.<\/jats:p>","DOI":"10.1002\/bit.28950","type":"journal-article","created":{"date-parts":[[2025,2,11]],"date-time":"2025-02-11T07:47:11Z","timestamp":1739260031000},"page":"1105-1117","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Assessing the Adjuvant Potential of Chinese Hamster Ovary Host Cell Proteins Using an In Vitro Dendritic Cell Assay"],"prefix":"10.1002","volume":"122","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-7122-0836","authenticated-orcid":false,"given":"Sherin","family":"Panikulam","sequence":"first","affiliation":[{"name":"Institute of Pharma Technology University of Applied Sciences Northwestern Switzerland Muttenz Switzerland"},{"name":"Department of Pharmaceutical Sciences University 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