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Molecular phenotype of G-CSF- or pegylated G-CSF-mobilized CD34+ cells

ABSTRACT: Peripheral blood stem and progenitor cells (PBSC) are widely used for autologous and allogeneic hematopoietic stem cell transplantation. PBSC can be mobilized into the peripheral blood using cytokines, cytotoxic chemotherapy or a combination of both. Granulocyte colony stimulating factor (G-CSF) has become the most commonly administered cytokine for PBSC mobilization because of its high potency and lack of serious toxicity. Recently, a modified form of recombinant human G-CSF has been introduced. This new compound is pegylated G-CSF (Peg-G-CSF) which possesses a substantially longer half-life than the unconjugated drug because of its reduced renal excretion and therefore provides the basis for continuous G-CSF serum-levels after a single injection. The use of Peg-G-CSF in patients who had received a cytotoxic chemotherapy was accompanied by mobilization kinetics different from those observed in patients who had received unconjugated G-CSF. In particular, more rapid leukocyte recovery and occurrence of CD34-positive cells in the peripheral blood was seen. These findings are presumably related to the more even and continuously high serum level of G-CSF maintained by Peg-G-CSF. Using microarray technology and functional assays, we examined whether pegylation of G-CSF and its different pharmacokinetics results in addition to an earlier leucocyte recovery in transcriptional and functional changes in CD34+ cells obtained from patients who had received either G-CSF or Peg-G-CSF following a standard cytotoxic chemotherapy for PBSC mobilisation. CD34+ hematopoietic stem and progenitor cells were isolated immunomagnetically from patients with multiple myeloma during chemotherapy and G-CSF-induced mobilization. Patients received either unconjugated G-CSF (n=9) or polyethylenglykol (PEG)-conjugated G-CSF (n=7). Total RNA was extracted, reversely transcribed, in vitro transcribed and labelled and hybridized to Affymetrix HG Focus Arrays. Following quality control and normalization differentially expressed genes were identified by significance analysis of microarrays (SAM). Comparing both groups 339 genes were significantly differentially expressed (q value <5%; fold change > 1.2). Peg-G-CSF-mobilized CD34+ cells showed an expression pattern of more early progenitor cells as early stem cell markers such as HOX genes were higher expressed and differentiation-associated genes were lower expressed in comparison with G-CSF-mobilized cells. Moreover, Peg-G-CSF-mobilized CD34+ cells had a greater expression level of cell-cycle-promoting genes suggesting a greater cycle activity of these cells. In conclusion, despite the similar active drug component different pharmacokinetics of Peg-G-CSF and G-CSF result in distinct molecular phenotypes reflecting different functional characteristics. Keywords: ordered

ORGANISM(S): Homo sapiens

PROVIDER: GSE4688 | GEO | 2006/05/03

SECONDARY ACCESSION(S): PRJNA96765

REPOSITORIES: GEO

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Project description:CD34+ hematopoietic stem and progenitor cells were isolated immunomagnetically from patients with multiple myeloma during chemotherapy and G-CSF-induced mobilization. Patients received either unconjugated G-CSF (n=9) or polyethylenglykol (PEG)-conjugated G-CSF (n=7). From each patient only one sample was analyzed. Total RNA was extracted, reversely transcribed, in vitro transcribed and labelled and hybridized to Affymetrix HG Focus Arrays according to manufacturer's instructions. Following quality control and normalization 9 samples of G-CSF-mobilized CD34+ cells were compared with 7 samples of PEG-G-CSF-mobilized cells were compared by significance analysis of microarrays (SAM). The aim was to figure out transcriptional differences resulting from various pharmacokinetics of the same drug (G-CSF: fluctuating serum levels; PEG-G-CSF: continously high serum levels). Peripheral blood stem and progenitor cells (PBSC) are widely used for autologous and allogeneic hematopoietic stem cell transplantation. PBSC can be mobilized into the peripheral blood using cytokines, cytotoxic chemotherapy or a combination of both. Granulocyte colony stimulating factor (G-CSF) has become the most commonly administered cytokine for PBSC mobilization because of its high potency and lack of serious toxicity. Recently, a modified form of recombinant human G-CSF has been introduced. This new compound is pegylated G-CSF (Peg-G-CSF) which possesses a substantially longer half-life than the unconjugated drug because of its reduced renal excretion and therefore provides the basis for continuous G-CSF serum-levels after a single injection. The use of Peg-G-CSF in patients who had received a cytotoxic chemotherapy was accompanied by mobilization kinetics different from those observed in patients who had received unconjugated G-CSF. In particular, more rapid leukocyte recovery and occurrence of CD34-positive cells in the peripheral blood was seen. These findings are presumably related to the more even and continuously high serum level of G-CSF maintained by Peg-G-CSF. Using microarray technology and functional assays, we examined whether pegylation of G-CSF and its different pharmacokinetics results in addition to an earlier leucocyte recovery in transcriptional and functional changes in CD34+ cells obtained from patients who had received either G-CSF or Peg-G-CSF following a standard cytotoxic chemotherapy for PBSC mobilisation. CD34+ hematopoietic stem and progenitor cells were isolated immunomagnetically from patients with multiple myeloma during chemotherapy and G-CSF-induced mobilization. Patients received either unconjugated G-CSF (n=9) or polyethylenglykol (PEG)-conjugated G-CSF (n=7). Total RNA was extracted, reversely transcribed, in vitro transcribed and labelled and hybridized to Affymetrix HG Focus Arrays. Following quality control and normalization differentially expressed genes were identified by significance analysis of microarrays (SAM). Comparing both groups 339 genes were significantly differentially expressed (q value <5%; fold change > 1.2). Peg-G-CSF-mobilized CD34+ cells showed an expression pattern of more early progenitor cells as early stem cell markers such as HOX genes were higher expressed and differentiation-associated genes were lower expressed in comparison with G-CSF-mobilized cells. Moreover, Peg-G-CSF-mobilized CD34+ cells had a greater expression level of cell-cycle-promoting genes suggesting a greater cycle activity of these cells. In conclusion, despite the similar active drug component different pharmacokinetics of Peg-G-CSF and G-CSF result in distinct molecular phenotypes reflecting different functional characteristics.

Project description:Granulocyte-colony stimulating factor (G-CSF) is used to boost granulocyte counts in immunocompromised patients, but its effects on the immune system may be counter productive. We tested the hypothesis that G-CSF mobilized peripheral blood stem cell (PBSC) products are immunologically down regulated based on gene microarray analysis. Ten peripheral blood samples from normal donors for allogeneic PBSC transplantation were obtained before and after administration of G-CSF and tested on Affymetrix Human U133 Plus 2.0 GeneChipÂ® microarrays. Significant changes in gene expression after G-CSF mobilization were reported by controlling the false discovery rate at 5%. Immune-related genes were isolated from the data set and categorized according to probe set annotations and a thorough, independent literature search. We found that G-CSF up-regulated inflammatory and neutrophil activation pathway gene expression; however, adaptive immune-related gene expression, such as antigen presentation, co-stimulation, T cell activation and cytolytic effector pathways, were generally down-regulated. Thus, despite significant increases in stem cells, lymphocytes and antigen presenting cells, G-CSF mobilized PBSC allografts exhibit a suppressive adaptive immune-related gene expression profile. Our data provides an explanation for the potentially immunosuppressive effects observed after G-CSF administration. Experiment Overall Design: This study was approved by the University of Florida Institutional Review Board. Five healthy donors (A-E) for allogeneic PBSC transplantation consented and were mobilized with rHu G-CSF at 10Âµ/kg/day for five days. Approximately 4mL of venous blood was collected before (Pre-G-CSF) and after (Post-G-CSF) mobilization. Whole blood leukocyte RNA was purified from each sample and used to generate cRNAs which were subsequently hybridized onto Affymetrix Human U133 Plus 2.0 GeneChipÂ® microarrays. Representative genes were successfully validated with quantitative RT-PCR.

Project description:Autologous hematopoietic stem cell transplantation (ASCT) improves survival in multiple myeloma (MM). However, up to 30% of MM patients are unable to collect optimal numbers of peripheral blood (PB) CD34+ hematopoietic stem and progenitor cells (HSPCs) with standard G-CSF mobilization. Motixafortide is a novel cyclic-peptide CXCR4 inhibitor with extended receptor occupancy and enhanced in-vivo activity. The GENESIS Trial is a prospective, phase III, double-blind, placebo-controlled, international, multicenter, superiority trial with 122 adult patients randomized (2:1) to motixafortide+G-CSF or placebo+G-CSF for HSPC mobilization for ASCT in MM (NCT03246529). The primary endpoint of the study was met, with motixafortide+G-CSF enabling 92.5% of patients to collect ≥6x106 CD34+ cells/kg within 2 apheresis procedures versus 26.2% with placebo+G-CSF (p<0.0001). A key, prespecified secondary endpoint was also met, with motixafortide+G-CSF enabling 88.8% of patients to collect ≥6x106 CD34+ cells/kg in 1 apheresis versus 9.5% with placebo+G-CSF (p<0.0001). Motixafortide+G-CSF was safe and well-tolerated, with the most common treatment-emergent adverse events observed being transient, Grade 1/2 injection site reactions (pain: 50%, erythema: 27.5%, pruritis: 21.3%). In addition, extended immunophenotyping and single-cell transcriptional profiling were performed on CD34+ HSPCs mobilized on the GENESIS Trial, as well as a contemporaneous MM cohort undergoing plerixafor+G-CSF mobilization for ASCT and 3 cohorts of allogeneic HSPC donors undergoing single-agent mobilization with motixafortide, plerixafor or G-CSF alone. Motixafortide+G-CSF resulted in a 10.5-fold increase in primitive HSPCs collected versus placebo+G-CSF (p<0.0001); and significantly greater numbers of early stem and progenitors versus both placebo+G-CSF (p<0.0001) and plerixafor+G-CSF (p=0.0327). Motixafortide also preferentially mobilized HSPC subsets with upregulated gene expression pathways associated with enhanced self-renewal, regeneration and quiescence (EGF, NFB/TNF and HBO1). In conclusion, motixafortide+G-CSF mobilized significantly greater CD34+ HSPC numbers within 2 apheresis procedures versus placebo+G-CSF. Motixafortide also preferentially mobilized primitive stem and early progenitor cells with unique transcriptional profiles versus plerixafor and G-CSF.

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Molecular phenotype of G-CSF- or pegylated G-CSF-mobilized CD34+ cells

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