title: Expression of tight junction molecule in the human serum-induced aggregation of human abdominal adipose-derived stem cells in vitro.
abstract: Previously we have shown that human abdominal adipose derived-stem cells (ADSCs) could aggregate during the high-density culture in the presence of human serum (HS). In the present study, we observed that human cord blood serum (CBS) and follicular fluid (HFF) also induced aggregation. Similarly, porcine serum could induce aggregation whereas bovine and sheep sera induced little aggregation. qRT-PCR analyses demonstrated that, compared to FBS-cultured ADSCs, HScultured cells exhibited higher level of mRNA expression of CLDN3, -6, -7, -15, and -16 genes among the tight junction proteins. ADSCs examined at the time of aggregation by culture with HS, BSA, HFF, CBS, or porcine serum showed significantly higher level of mRNA expression of JAM2 among JAM family members. In contrast, cells cultured in FBS, bovine serum or sheep serum, showed lower level of JAM2 expression. Immunocytochemical analyses demonstrated that the aggregates of HS-cultured cells (HS-Agg) showed intense staining against the anti-JAM2 antibody whereas neither non-aggregated cells (HS-Ex) nor FBS-cultured cells exhibited weak staining. Western blot results showed that HS-Agg expressed JAM2 protein more prominently than HS-Ex and FBS-cultured cells, both of latter reveled weaker intensity. These results suggest that the aggregation property of ADSCs during high-density culture would be dependent on the specific components of serum, and that JAM2 molecule could play a role in the animal sera-induced aggregation in vitro.
authors.affiliation: Dept. of Biotechnology, Seoul Women's University, Seoul 139-774, Korea.
authors.forename: A Young
authors.initials: AY
authors.lastname: Yoon
authors.affiliation: Dept. of Biotechnology, Seoul Women's University, Seoul 139-774, Korea.
authors.forename: Sujin
authors.initials: S
authors.lastname: Yun
authors.affiliation: Dept. of Biotechnology, Seoul Women's University, Seoul 139-774, Korea.
authors.forename: HyeJin
authors.initials: H
authors.lastname: Yang
authors.affiliation: Dept. of Biotechnology, Seoul Women's University, Seoul 139-774, Korea.
authors.forename: Yoon Hwa
authors.initials: YH
authors.lastname: Lim
authors.affiliation: Dept. of Biotechnology, Seoul Women's University, Seoul 139-774, Korea.
authors.forename: Haekwon
authors.initials: H
authors.lastname: Kim
keywords: Aggregation; Animal serum; Human abdominal adipose-derived stem cells; Human body fluid; Human serum; Tight junction