title: Effect of thymosin α₁ on the phenotypic and functional maturation of dendritic cells from children with acute lymphoblastic leukemia.
abstract: To determine the effect of thymosin α1 (Tα1) on the phenotypic and functional maturation of HL‑60 cells, freeze‑thaw antigen‑loaded dendritic cells (DCs) were derived from peripheral blood mononuclear cells (PBMCs) of children with acute lymphoblastic leukemia (ALL). The DCs were generated from the PBMC samples that were collected from the PB of 10 consecutive ALL children. On day 3 of culturing, the cells in the antigen + no Tα1 (AN) and antigen + Tα1 (AT) groups were incubated with 100 µl lysates obtained from freeze‑thaw cycling. After 5 days of incubation, the AT group was administered with 100 ng/ml Tα1. On day 8, the DCs were stained with fluorescein isothiocyanate‑conjugated cluster of differentiation (CD)1a, CD83 and HLA‑DR antibodies and analyzed by flow cytometry. In addition, the killing activity of cytotoxic T lymphocytes (CTLs) from the different groups on wild‑type leukemia cells was measured. The DCs in the AT group exhibited more apparent, characteristic dendritic morphologies than the control and AN group DCs. Furthermore, the lowest expression level of CD1a, and the highest expression of CD83 and HLA‑DR were observed in the AT group when compared with the AN and control groups (P<0.05). The lactate dehydrogenase release assay demonstrated that the killing rate of CTL in the AT group was significantly higher than that in the control and AN groups (P<0.01). Thus, Tα1 may markedly promote the phenotypic and functional maturation of DCs, and may serve as a suitable immunomodulator of DC‑based immunotherapy for treatment of hematological malignancies.
authors.affiliation: Department of Pediatric Hematology and Oncology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China.
authors.forename: Xuerong
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Pediatric Hematology and Oncology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China.
authors.forename: Xiaodan
authors.initials: X
authors.lastname: Liu
authors.affiliation: Department of Pediatric Hematology and Oncology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China.
authors.forename: Yanxia
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Department of Pediatric Hematology and Oncology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China.
authors.forename: Ren
authors.initials: R
authors.lastname: Zhong
authors.affiliation: Department of Pediatric Hematology and Oncology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China.
authors.forename: Aiqin
authors.initials: A
authors.lastname: Song
authors.affiliation: Department of Pediatric Hematology and Oncology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China.
authors.forename: Lirong
authors.initials: L
authors.lastname: Sun
mesh_terms: D015703:Antigens, CD / Q000235:genetics / Q000378:metabolism; D018949:Antigens, CD1 / Q000235:genetics / Q000378:metabolism; D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D002675:Child, Preschool; D003713:Dendritic Cells / Q000187:drug effects* / Q000378:metabolism; D005260:Female; D018922:HL-60 Cells; D006684:HLA-DR Antigens / Q000235:genetics / Q000378:metabolism; D006801:Humans; D007136:Immunoglobulins / Q000235:genetics / Q000378:metabolism; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics / Q000378:metabolism; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000188:drug therapy / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000187:drug effects / Q000378:metabolism; D000077596:Thymalfasin; D013947:Thymosin / Q000031:analogs & derivatives* / Q000494:pharmacology; D000097802:CD83 Antigen
chemical_list: D015703:Antigens, CD; D018949:Antigens, CD1; D006684:HLA-DR Antigens; D007136:Immunoglobulins; D008562:Membrane Glycoproteins; D000077596:Thymalfasin; D013947:Thymosin; D000097802:CD83 Antigen; C419393:CD1a antigen