Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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DNA sequencing comparing different stages of leukemic progression in a mouse model of severe congenital neutropenia (SCN)

ABSTRACT: To address how Csf3r and RUNX1 mutations in combination with CSF3 administration affect hematopoiesis in vivo, we performed serial transplantation experiments. Lineage-negative Csfr-d715 BM cell cells were lentivirally transduced with the patient specific RUNX1-D171N (RHD) mutant or an empty vector control. Primary recipients showed a pre-leukemic condition characterised by myeloblasts in the peripheral blood, but not overt AML. Upon serial transplantation, one of the Csfr-d715/RUNX1-D171N mutant mice, treated with CSF3, could repopulate secondary and tertiary recipients. Whole exome sequencing on these mice were performed to investigate whether these mice acquired an additional mutation. Enzymatically fragmented genomic DNA was used to construct sample libraries following the SeqCap EZ HyperPlusCap workflow User’s Guide version 1.0 (Roche). Unique, dual index adapters (Integrated DNA technologies) were used for ligation. After ligation of adapters and an amplification step, exome target sequences were captured using in-solution oligonucleotide baits (SeqCap EZ Developer Library mm9_exome_L2R_D02). Amplified captured sample libraries were paired-end sequenced on the HiSeq 2500 platform (Illumina).

INSTRUMENT(S): Illumina HiSeq 2500

ORGANISM(S): Mus musculus

SUBMITTER: Patricia Olofsen

PROVIDER: E-MTAB-9376 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Inducible co-stimulator (ICOS) interaction with its ligand (ICOSL) is involved in several T cell effector functions. While blockade of ICOS:ICOSL interaction in chronic graft versus host disease (GVHD) seems benefi cial, results for acute GVHD remain controversial. To further elucidate its role in acute GVHD, C57BL / 6 mice were lethally irradiated and reconstituted with allogeneic spleen cells in the absence or presence of ICOSL-blocking mAb. Mice reconstituted with allogeneic spleen cells experienced severe GVHD and died untreated within 6 M-bM-^@M-^S 9 days after transplantation. Mice treated with an anti-ICOSL mAb starting from day 3 after transplantation gained weight again and survived for at least additional 12 days, although the treatment was already stopped at day 11 after transplantation. In contrast, the anti-ICOSL treatment starting from day 0 did not prevent GVHD. The diff erence between therapeutic (day 3) and prophylactic (day 0) anti-ICOSL treatment was independent of CD25 + CD4 + regulatory T cells since their depletion did not abrogate the therapeutic eff ect of ICOSL blockade. Microarray analysis revealed IFN- M-NM-3 and chemokine up-regulation in spleen cells of prophylactically treated mice, emphasizing kinetic dependence of acute GVHD modulation via blockade of ICOS:ICOSL interaction. B6 recipients were irradiated with 10.0 Gray, administered from a 137 Cs source. Splenocytes from C3H mice were prepared as single cell suspensions in PBS, depleted of red blood cells and counted. 2 M-bM-^@M-^S 3 M-CM-^W 10^7 C3H splenocytes in a volume of 200 M-NM-<l were transplanted into B6 recipients via tail vein injection (4 mice per group per experiment) 4 M-bM-^@M-^S 6 h after irradiation. Mice in the treatment group with anti-ICOSL mAb and their respective controls, received 500 M-NM-<g mAb i. p starting at day 0 or day 3, followed by subsequent injections of 200 M-NM-<g of mAb every other day. At day 4 after transplantation RNA of spleen cells was prepared and subjected to microarray analysis. Combined RNA from allogeneic transplanted mice was hybridized onto 2 independent arrays.

Project description:The frequency of delayed function of kidney transplants varies greatly and is associated with the quality of graft, donor age, and the duration of cold ischemia time. Body weight differences between donor and recipient can affect primary graft function. The underlying mechanism is poorly understood. Here, we have transplanted kidney grafts from commensurate body weight (L-WD) or reduced body weight (H-WD) donor rats into syngeneic or allogeneic recipients. 24 hours post-transplantation, serum creatinine level in H-WD recipients was significantly higher compared to that of L-WD recipients indicating impaired primary graft function. We detected a 10 fold higher transcription of IL-6 and dramatically increased tubular destruction in grafts from H-WD recipients. This was accompanied by decreased expression of genes associated with kidney function and an up-regulation of other genes such as cytochrome P450 isoforms, FosL and Trib3 as revealed by DNA microarray analysis. A single application of IL-6 into L-WD recipients is sufficient to impair primary graft function and to cause tubular damage. Whereas, immediate neutralization of IL-6 receptor signaling rescued primary graft function resulting in low serum creatinine levels, well-preserved kidney graft architecture and a normalized gene expression profile. These findings have strong clinical implication as anti-IL6R treatment of patients receiving grafts from lower-weight donors could be used to improve primary graft function. The dataset comprises eight samples divided into four sample groups. Each group represents rat kidneys collected after allogeneic transplantation under a certain condition and includes two biological replicates. The first group is characterized by a high body weight difference between donor and recipient, rats in the second group exhibit a low weight difference. Group three and four are similar to group one, but underwent an additional treatment with anti-IL6R mAb or prednisolone immediately after transplantation.

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DNA sequencing comparing different stages of leukemic progression in a mouse model of severe congenital neutropenia (SCN)

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