Research Article | Open Access
Agata Szade, Witold N. Nowak, Krzysztof Szade, Anna Gese, Ryszard Czypicki, Halina Waś, Józef Dulak, Alicja Józkowicz, "Effect of Crossing C57BL/6 and FVB Mouse Strains on Basal Cytokine Expression", Mediators of Inflammation, vol. 2015, Article ID 762419, 10 pages, 2015. https://doi.org/10.1155/2015/762419
Effect of Crossing C57BL/6 and FVB Mouse Strains on Basal Cytokine Expression
C57BL/6 is the most often used laboratory mouse strain. However, sometimes it is beneficial to cross the transgenic mice on the C57BL/6 background to the other strain, such as FVB. Although this is a common strategy, the influence of crossing these different strains on homeostatic expression of cytokines is not known. Here we have investigated the differences in the expression of selected cytokines between C57BL/6J and C57BL/6JxFVB mice in serum and skeletal muscle. We have found that only few cytokines were altered by crossing of the strains. Concentrations of IL5, IL7, LIF, MIP-2, and IP-10 were higher in serum of C57BL/6J mice than in C57BL/6JxFVB mice, whereas concentration of G-CSF was lower in C57BL/6J. In the skeletal muscle only the concentration of VEGF was higher in C57BL/6J mice than in C57BL/6JxFVB mice. Concluding, the differences in cytokine expression upon crossing C57BL/6 and FVB strain in basal conditions are not profound.
Laboratory mouse is one of the central model organisms in modern biology, especially since the sequencing of mouse genome. Mouse fanciers and scientists created first inbred strains in the early XX century . Till now numerous mouse types were introduced. Mouse strains differ not only in the coat color but also in blood parameters , immune response , behavior  and reaction to stress , and susceptibility to diseases, that is, atherosclerosis , diabetes  and its complications , cancer , as well as response to the gene knock-out [10, 11] or transgene expression . Different strains can also vary in lethality after the snake venom treatment .
The strain ontology can be assessed with the analysis of single nucleotide polymorphisms (SNP)  combined with quantitative trait locus mapping (QTL) and gene expression analysis [15, 16], as well as with microarray gene expression profiling  or mitochondrial DNA analysis . Of note, gene targeting by homologous recombination or generation of multiple gene knock-out animals often requires the crossing of different inbred strains of mice and therefore increases mouse genetic variability. However, it may also lead to the phenomenon called hybrid vigor  or heterosis , which consists in the higher viability and improved parameters of heterozygous progeny in comparison to the inbred parents.
One of the examples where crossing different strains turned out to be beneficial was observed in case heme oxygenase knock-out animals (Hmox1−/−). Hmox1−/− mice were created on the background of C57BL/6J mice by Poss and Tonegawa . Hmox1−/− animals were smaller than their wild type littermates, had microcytic anemia, reduced serum iron levels while iron accumulated in kidney and liver, and showed chronic inflammation and splenomegaly . What is more, Hmox1+/− mice bred poorly and only less than 5% of newborns from Hmox1+/− parents were Hmox1−/− homozygotes . Other group reported even lower yield (1-2 Hmox1−/− homozygotes in 160–200 pups) . Therefore, in order to improve Hmox1−/+ mice breeding (Hmox1−/− female homozygotes are infertile), Hmox1+/− mice were backcrossed 4-5 times to wild type FVB mice. Such Hmox1−/− C57BL/6JxFVB mice could be more easily bred, but maintained other characteristics of original Hmox1−/− strain . On the other side, the backcrossing of predominantly C57BL/6J to FVB mice resulted as well in creation of another wild type control strain.
Expression of Hmox1 can be driven by nuclear factor (erythroid-derived 2)-like 2, also known as NFE2L2 or Nrf2, in response to oxidative stress . Nrf2−/− mice were generated in 1997 on the ICR mouse strain background  and then backcrossed to C57BL/6 strain for at least 6 generations . Hmox1−/− mice show impaired regeneration in response to the hind limb ischemia  while Nrf2−/− mice show better revascularization due to the inflammatory angiogenesis . However, due to the different genetic background it is difficult to compare directly effects of Hmox1 and Nrf2 deletion. Given that Nrf2/HO-1 pathway is recognized as potent anti-inflammatory mechanism, we were wondering how crossing of C57BL/6 mice with FVB strain expression of the growth factors and inflammatory mediators. This is of particular importance for interpretation of results obtained on mouse with mixed C57BL/6xFVB genetic background that is often the case for mouse gene knock-out models.
Animals were handled in a strict accordance with good animal practice as defined by the relevant national and local animal welfare bodies. All animal work was approved by the Local Ethical Committee for Animal Research at the Jagiellonian University. Breeding heterozygote pairs of Hmox1 deficient mice were initially kindly provided by Dr. Anupam Agarwal, University of Alabama, Birmingham, USA.
2.1. Serum Analysis
Female 5-month-old C57BL/6J and C57BL/6JxFVB mice were euthanized by overdosage of xylazine and ketamine. Blood was collected from the vena cava and after clot formation centrifuged for 10 minutes at 1000 g. Serum was collected and frozen at −80°C for further analysis.
Luminex assay (MILLIPLEX MAP Mouse Cytokine/Chemokine-Premixed 32 Plex, Merck, Millipore) was performed according to manufacturer’s instructions. The samples were diluted 1 : 1 in Assay Buffer and incubated with Premixed Beads overnight at 4°C. Signal detection was done using FLEXMAP 3D system.
2.2. Muscle Lysate Analysis
Female and male C57BL/6J and female C57BL/6JxFVB 2- to 3-month-old mice were injected with 25 μL saline intramuscularly (to both legs). Mice were euthanized by isoflurane overdose and gastrocnemius muscles were excised and homogenized in lysis buffer (PBS, 10% Triton, protease inhibitor cocktail tablets, Roche–1 tablet/50 mL) in tissue lyser (Qiagen).
Luminex assay (The Cytokine Mouse Magnetic 20-Plex Panel, Invitrogen) was performed according to manufacturer’s instructions. The samples were diluted in lysis buffer and incubated with Premixed Beads overnight at 4°C. Signal detection was done using FLEXMAP 3D system. Total protein concentration was measured by BCA assay. Briefly, 100 μL of 1 : 50 mixture of CuSO4 and bicinchonic acid was added to 5 μL of sample on 96-well plate, incubated 30 min at 37°C and absorbance was measured at 562 nm on Tecan microplate reader.
2.3. Statistical Analysis
Statistical analysis was done with GraphPad Prism software. Data are presented as mean + SEM of at least 4 measurements. Two-tailed unpaired -test was applied. Results were considered as statistically significant, when (; ).
We observed increased concentration of granulocyte colony-stimulating factor (G-CSF) in the serum of C57BL/6JxFVB mice in comparison to C57BL/6J mice (374.5 ± 10.73 pg/mL versus 220.8 pg/mL ± 27.41, , Figure 1). Concentrations of other hematopoietic growth factor, macrophage colony-stimulating factor (M-CSF) was low (<4 pg/mL) and similar between the two strains. The level of granulocyte-macrophage colony-stimulating factor (GM-CSF) was not detectable in the serum. Crossbreeding did not affect the concentration of vascular endothelial growth factor (VEGF) in serum (Figure 1).
We observed the same small amounts (~2 pg/mL) of proinflammatory cytokines, tumor necrosis factor α (TNFα) and interferon γ (INFγ) in C57BL/6JxFVB and C57BL/6J (Figure 2).
Out of the whole panel of interleukins measured, only few were in different concentrations between the strains. IL5, leukemia inhibitory factor (LIF) and IL7 concentrations were lower in the serum of C57BL/6JxFVB than in C57BL/6J mice (Figure 3), however the concentrations of IL7 and LIF were on the border of detection in C57BL/6JxFVB. Concentrations of IL-1α, IL9, IL10, IL12p40, IL13 and IL17 were similar in both strains, whereas concentrations of IL1β, IL2, IL3, IL4, IL6, IL12p70 were below the detection limit. Most of the interleukins were at levels of 1–10 pg/mL, whereas IL1α and IL13 were more abundant (300–500 pg/mL and 50–120 pg/mL, resp.).
Next we have analyzed the concentration of selected chemokines in serum. None of the measured chemokines from the CCL family, monocyte chemotactic protein 1 (MCP-1), macrophage inflammatory protein-1 β (MIP-1β), RANTES, or eotaxin was different between the compared strains. However two CXCL chemokines, macrophage inflammatory protein-2 (MIP-2) and interferon gamma-induced protein (IP-10), were decreased in serum of C57BL/6JxFVB when compared to C57BL/6J mice (52.1 versus 77.4 pg/mL and 39.3 versus 58.7 pg/mL, resp.). Concentrations of other CXCL chemokines, KC, LPS-induced CXC chemokine (LIX) and monokine induced by gamma interferon (MIG), were the same in both strains (Figure 4). Macrophage inflammatory protein-1 α (MIP-1α) was not detectable in any of the strains.
Finally, we evaluated the expression of several cytokines in the lysates from the gastrocnemius muscle. Cytokines which were in different concentrations in plasma in C57BL/6JxFVB and C57BL/6J, IL5 and IP-10, were at the same concentration in the muscle in both strains. We observed no differences in the concentrations of GM-CSF, IL1b, IL10, MCP-1 and KC in the muscles of C57BL/6JxFVB and C57BL/6J. However, the expression of vascular endothelial growth factor (VEGF) was lower in C57BL/6JxFVB than in C57BL/6J. At the same time concentration of another proangiogenic cytokine, basic fibroblast growth factor (bFGF), was unchanged (Figure 5).
The presented study revealed the degree of changes within concentration of inflammatory mediators in serum and muscles between C57BL/6J strain and mixed C57BL/6JxFVB strain.
It is widely accepted that various mouse strains are phenotypically different. The differences between commonly used mouse strains are also visible on genomic level. Significant gene content variation characterizes the genomes of inbred mouse strains [28, 29] and includes large deletions and amplifications observed between strains. Therefore, when interpreting experimental results one should take into account a possible influence of genetic background of studied mouse strain. This is especially important when choosing controls for knock-out genetic mouse model.
Several phenotypical differences were observed between C57BL/6 and FVB strains. C57BL/6 mice are more susceptible to anesthetic agents, pentobarbital, ketamine, and nitrous oxide in comparison to FVB mice . Mammary tumors develop later in MMTV-PyMT model on C57BL/6J background than on FVB/NJ background . Osteoblasts isolated from C57BL/6 and C3H/HeJ male mice had higher expression and activity of alkaline phosphatase than osteoblasts isolated from female mice, but such difference was not observed in FVB and BALB/c strains .
Differences in expression of cytokines between the strains were also reported. For example, profiles of serum cytokines were different both in control mice, as well as after induction of experimental immune thrombocytopenia between C57BL/6J and BALB/c .
C57BL/6 strain is commonly used for generation of novel knock-out animal models. However, this strain possesses features that may be unfavorable in given experimental settings comparing to other strains. FVB/N strain is frequently used as a background for transgenic mouse models due to its high fertility and large litters [34, 35]. Therefore, knock-out animals on C57BL/6 background that are hard to breed are often crossed with FVB/N strain to improve their propagation. Accordingly, poor breeding of C57BL/6 Hmox1+/− mice was improved after crossing with FVB . Crossing of Hmox1+/− mice which were predominantly on the C57BL/6 background resulted in Hmox1−/− offspring in the number of 2–6.25% of expected mice from Mendelian ratio . In our laboratory Hmox1−/− pups are 5.1% of delivered newborns when crossing C57BL/6JxFVB Hmox1 heterozygotes, what is in consistence with the original report . We could further increase efficiency of Hmox1−/− mouse generation to 20.1% of delivered pups when Hmox1−/− males are crossed with Hmox1+/− females. One should be aware, however, that manipulating the background may influence the phenotype of the transgenic animal. Different phenotype of the same mutation in different strains gives the opportunity to choose the strain which better resembles the human disease. In the model of hereditary inclusion body myopathy (HIBM) the transgenic mice of C57BL/6 strain developed severe kidney dysfunction and died within few days after birth . Kidney dysfunction is not observed among HIBM patients with GNE mutations, so the mouse model did not reflect properly the human disease. After crossing with FVB, the glomerular disease was less pronounced and mice survived longer, retaining skeletal muscle pathology .
Despite the fact that crossing genetic mouse models on C57BL/6 background with FVB mice helps to avoid limitations, is it has not been studied how such strategy influence the expression of inflammatory mediators. Given that crossing to FVB strain partially rescued the embryonic lethality of Hmox1 deficiency and glomerular disease of transgenic mouse we addressed this question in the presented work.
We found several differences in cytokine concentration in serum between the C57BL/6J and the mixed strain C57BL/6JxFVB. IL5 concentration was lower in C57BL/6JxFVB in comparison to the C57BL/6J. However we have not seen any differences in the levels of the same cytokine family members, GM-CSF and IL3. Out of the common cytokine receptor gamma-chain family, only IL7 was affected, concentrations of IL2, IL4, and IL9 remained unchanged. We observed smaller concentration of LIF in serum of C57BL/6JxFVB than in C57BL/6J mice. Level of IL6, member of the same family as LIF, was similar in both mouse strains. However concentrations of these cytokines are very small, on border of detection limit and therefore they may not have the biological significance. The important difference seems to occur in case of G-CSF. C57BL/6JxFVB mice had 1.7x higher concentration of G-CSF than C57BL/6J mice (374.5 versus 220.8 pg/mL, resp.). G-CSF is important for neutrophil precursors proliferation and differentiation, and mature neutrophils release from the bone marrow to the blood [37, 38]. Difference in G-CSF concentration between the strains can supposably affect granulocyte function and their mobilization in response to injury or infection, as well as mobilization of hematopoietic stem cells (HSC). This could be especially important, as C57BL/6 mice are known to be “poor mobilizers” .
In the earlier mentioned work by Valles-Ayoub et al. survival of hereditary inclusion body myopathy transgenic mice was significantly improved by crossing the original C57BL/6 background with FVB strain . Interestingly, Volpi et al. reported the increased concentration of VEGF- in the muscle biopsies from patients with idiopathic inflammatory myopathies, among them sporadic inclusion body myositis (IBM) . Our results show the lower concentration of VEGF in the muscle of mixed C57BL/6JxFVB strain in comparison to C57BL/6J. This might contribute to the less severe phenotype of the disease in transgenic mice on the mixed background.
Differential expression of cytokines can influence the results of various in vivo experiments. It should be also taken into consideration when the cells isolated from mice are cultured ex vivo in the presence of cytokines. Possibly, for cells isolated from some of the strains different concentrations of supplemented cytokines may be needed to induce differentiation or functional activity.
Considering significant genetic differences between various mouse strains it could be expected that concentration of proinflammatory cytokines in often used C57BL/6JxFVB mixed strain will be also affected. However our study showed that crossbreeding of C57BL/6J with FVB mice did not affect majority of cytokines in serum and skeletal muscle. The only cytokines that were significantly different between C57BL/6J and mixed C57BL/6JxFVB strain include G-CSF concentration in serum and VEGF concentration in gastrocnemius muscle. Therefore findings of the study should be considered when using this mixed background in hematological studies due to different G-CSF concentrations in serum and myopathy and muscle regeneration studies due to the different concentrations of VEGF in muscles.
Conflict of Interests
The authors declare that there is no conflict of interests regarding the publication of this paper.
The authors thank Ewa Werner, Elżbieta Śliżewska, Karolina Hajduk, and Janusz Drebot for their assistance with animal care. The study was supported by National Science Center (Maestro Program 2012/06/A/NZ1/00004) (awarded to J. Dulak) and structural funds from the European Union (Grants nos. POIG.02.01.00-12-064/08 and 02.02.00-00-014/08). Faculty of Biochemistry, Biophysics and Biotechnology of Jagiellonian University is a partner of the Leading National Research Center (KNOW) supported by the Ministry of Science and Higher Education.
- C. M. Wade and M. J. Daly, “Genetic variation in laboratory mice,” Nature Genetics, vol. 37, no. 11, pp. 1175–1180, 2005.
- B. T. Kile, C. L. Mason-Garrison, and M. J. Justice, “Sex and strain-related differences in the peripheral blood cell values of inbred mouse strains,” Mammalian Genome, vol. 14, no. 1, pp. 81–85, 2003.
- R. S. Sellers, C. B. Clifford, P. M. Treuting, and C. Brayton, “Immunological variation between inbred laboratory mouse strains: points to consider in phenotyping genetically immunomodified mice,” Veterinary Pathology, vol. 49, no. 1, pp. 32–43, 2012.
- J. N. Crawley, J. K. Belknap, A. Collins et al., “Behavioral phenotypes of inbred mouse strains: implications and recommendations for molecular studies,” Psychopharmacology, vol. 132, no. 2, pp. 107–124, 1997.
- M. J. V. van Bogaert, L. Groenink, R. S. Oosting, K. G. C. Westphal, J. van Der Gugten, and B. Olivier, “Mouse strain differences in autonomic responses to stress,” Genes, Brain and Behavior, vol. 5, no. 2, pp. 139–149, 2006.
- P. M. Nishina, J. Wang, W. Toyofuku, F. A. Kuypers, B. Y. Ishida, and B. Paigen, “Atherosclerosis and plasma and liver lipids in nine inbred strains of mice,” Lipids, vol. 28, no. 7, pp. 599–605, 1993.
- M. Rossmeisl, J. S. Rim, R. A. Koza, and L. P. Kozak, “Variation in type 2 diabetes—related traits in mouse strains susceptible to diet-induced obesity,” Diabetes, vol. 52, no. 8, pp. 1958–1966, 2003.
- Z. Qi, H. Fujita, J. Jin et al., “Characterization of susceptibility of inbred mouse strains to diabetic nephropathy,” Diabetes, vol. 54, no. 9, pp. 2628–2637, 2005.
- C. D. Woodworth, E. Michael, L. Smith et al., “Strain-dependent differences in malignant conversion of mouse skin tumors is an inherent property of the epidermal keratinocyte,” Carcinogenesis, vol. 25, no. 9, pp. 1771–1778, 2004.
- R. B. S. Harris, T. D. Mitchell, X. Yan, J. S. Simpson, and S. M. Redmann Jr., “Metabolic responses to leptin in obese db/db mice are strain dependent,” The American Journal of Physiology—Regulatory Integrative and Comparative Physiology, vol. 281, no. 1, pp. R115–R132, 2001.
- A. M. Madiehe, S. Hebert, T. D. Mitchell, and R. B. S. Harris, “Strain-dependent stimulation of growth in leptin-treated obese db/db mice,” Endocrinology, vol. 143, no. 10, pp. 3875–3883, 2002.
- M. L. Opsahl, M. McClenaghan, A. Springbett et al., “Multiple effects of genetic background on variegated transgene expression in mice,” Genetics, vol. 160, no. 3, pp. 1107–1112, 2002.
- S. F. Barros, I. Friedlanskaia, V. L. Petricevich, and T. L. Kipnis, “Local inflammation, lethality and cytokine release in mice injected with Bothrops atrox venom,” Mediators of Inflammation, vol. 7, no. 5, pp. 339–346, 1998.
- P. M. Petkov, Y. Ding, M. A. Cassell et al., “An efficient SNP system for mouse genome scanning and elucidating strain relationships,” Genome Research, vol. 14, no. 9, pp. 1806–1811, 2004.
- R. Hitzemann, B. Malmanger, C. Reed et al., “A strategy for the integration of QTL, gene expression, and sequence analyses,” Mammalian Genome, vol. 14, no. 11, pp. 733–747, 2003.
- T. M. Keane, L. Goodstadt, P. Danecek et al., “Mouse genomic variation and its effect on phenotypes and gene regulation,” Nature, vol. 477, no. 7364, pp. 289–294, 2011.
- P. Kraus, X. Xing, S. L. Lim et al., “Mouse strain specific gene expression differences for illumina microarray expression profiling in embryos,” BMC Research Notes, vol. 5, article 232, 2012.
- A. Goios, L. Pereira, M. Bogue, V. Macaulay, and A. Amorim, “mtDNA phylogeny and evolution of laboratory mouse strains,” Genome Research, vol. 17, no. 3, pp. 293–298, 2007.
- D. P. Wolfer, W. E. Crusio, and H.-P. Lipp, “Knockout mice: simple solutions to the problems of genetic background and flanking genes,” Trends in Neurosciences, vol. 25, no. 7, pp. 336–340, 2002.
- E. Franks, N. S. Fechheimer, and C. Cohen, “An examination of heterosis in crosses of certain inbred strains of mice,” Ohio Journal of Science, vol. 62, pp. 177–184, 1962.
- K. D. Poss and S. Tonegawa, “Heme oxygenase 1 is required for mammalian iron reutilization,” Proceedings of the National Academy of Sciences of the United States of America, vol. 94, no. 20, pp. 10919–10924, 1997.
- M. H. Kapturczak, C. Wasserfall, T. Brusko et al., “Heme oxygenase-1 modulates early inflammatory responses: evidence from the heme oxygenase-1-deficient mouse,” The American Journal of Pathology, vol. 165, no. 3, pp. 1045–1053, 2004.
- N. Li, J. Alam, M. I. Venkatesan et al., “Nrf2 is a key transcription factor that regulates antioxidant defense in macrophages and epithelial cells: protecting against the proinflammatory and oxidizing effects of diesel exhaust chemicals,” Journal of Immunology, vol. 173, no. 5, pp. 3467–3481, 2004.
- K. Itoh, T. Chiba, S. Takahashi et al., “An Nrf2/small Maf heterodimer mediates the induction of phase II detoxifying enzyme genes through antioxidant response elements,” Biochemical and Biophysical Research Communications, vol. 236, no. 2, pp. 313–322, 1997.
- G. K. McWalter, L. G. Higgins, L. I. McLellan et al., “Transcription factor Nrf2 is essential for induction of NAD(P)H:quinone oxidoreductase 1, glutathione S-transferases, and glutamate cysteine ligase by broccoli seeds and isothiocyanates,” Journal of Nutrition, vol. 134, no. 12, pp. 3499S–3506S, 2004.
- A. Jazwa, J. Stepniewski, M. Zamykal et al., “Pre-emptive hypoxia-regulated HO-1 gene therapy improves post-ischaemic limb perfusion and tissue regeneration in mice,” Cardiovascular Research, vol. 97, no. 1, pp. 115–124, 2013.
- U. Florczyk, A. Jazwa, M. Maleszewska et al., “Nrf2 regulates angiogenesis: effect on endothelial cells, bone marrow-derived proangiogenic cells and hind limb ischemia,” Antioxidants and Redox Signaling, vol. 20, no. 11, pp. 1693–1708, 2014.
- K. Akagi, J. Li, R. M. Stephens, N. Volfovsky, and D. E. Symer, “Extensive variation between inbred mouse strains due to endogenous L1 retrotransposition,” Genome Research, vol. 18, no. 6, pp. 869–880, 2008.
- G. Cutler, L. A. Marshall, N. Chin, H. Baribault, and P. D. Kassner, “Significant gene content variation characterizes the genomes of inbred mouse strains,” Genome Research, vol. 17, no. 12, pp. 1743–1754, 2007.
- Y. Sato, N. Seo, and E. Kobayashi, “Genetic background differences between FVB and C57BL/6 mice affect hypnotic susceptibility to pentobarbital, ketamine and nitrous oxide, but not isoflurane,” Acta Anaesthesiologica Scandinavica, vol. 50, no. 5, pp. 553–556, 2006.
- S. A. Davie, J. E. Maglione, C. K. Manner et al., “Effects of FVB/NJ and C57Bl/6J strain backgrounds on mammary tumor phenotype in inducible nitric oxide synthase deficient mice,” Transgenic Research, vol. 16, no. 2, pp. 193–201, 2007.
- S. Zanotti, I. Kalajzic, H. L. Aguila, and E. Canalis, “Sex and genetic factors determine osteoblastic differentiation potential of murine bone marrow stromal cells,” PLoS ONE, vol. 9, no. 1, Article ID e86757, 2014.
- D. Leontyev, A. Neschadim, and D. R. Branch, “Cytokine profiles in mouse models of experimental immune thrombocytopenia reveal a lack of inflammation and differences in response to intravenous immunoglobulin depending on the mouse strain,” Transfusion, vol. 54, no. 11, pp. 2871–2879, 2014.
- T.-T. Li, S. Larrucea, S. Souza et al., “Genetic variation responsible for mouse strain differences in integrin α2 expression is associated with altered platelet responses to collagen,” Blood, vol. 103, no. 9, pp. 3396–3402, 2004.
- M. Taketo, A. C. Schroeder, L. E. Mobraaten et al., “FVB/N: an inbred mouse strain preferable for transgenic analyses,” Proceedings of the National Academy of Sciences of the United States of America, vol. 88, no. 6, pp. 2065–2069, 1991.
- Y. Valles-Ayoub, A. Haghighatgoo, C. Saechao et al., “Mixed inbred FVB;B6 background strain attenuates kidney disease and improves survival of GneM712t/M712T mice,” Molecular Biology, vol. 1, no. 1, 2012.
- L. L. de Figueiredo, R. S. de Abreu E Lima, and E. M. Rego, “Granulocyte colony-stimulating factor and leukemogenesis,” Mediators of Inflammation, vol. 13, no. 3, pp. 145–150, 2004.
- G. J. Lieschke, D. Grail, G. Hodgson et al., “Mice lacking granulocyte colony-stimulating factor have chronic neutropenia, granulocyte and macrophage progenitor cell deficiency, and impaired neutrophil mobilization,” Blood, vol. 84, no. 6, pp. 1737–1746, 1994.
- M. A. Ryan, K. J. Nattamai, E. Xing et al., “Pharmacological inhibition of EGFR signaling enhances G-CSF-induced hematopoietic stem cell mobilization,” Nature Medicine, vol. 16, no. 10, pp. 1141–1146, 2010.
- N. Volpi, A. Pecorelli, P. Lorenzoni et al., “Antiangiogenic VEGF isoform in inflammatory myopathies,” Mediators of Inflammation, vol. 2013, Article ID 219313, 10 pages, 2013.
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