Articles by Alexander Francke in JoVE
Isolamento e injecção intravenosa de Murino de Medula Óssea Derivado monócitos Martin Wagner1, Helen Koester1, Christian Deffge1, Soenke Weinert1, Johannes Lauf1, Alexander Francke2, Jerry Lee3, R. C. Braun- Dullaeus1, Joerg Herold1 1Department for Cardiology, Angiology and Pneumology, Otto von Guericke University Magdeburg, 2Herzzentrum Dresden, Universitätsklinikum an der Technischen Universität Dresden, Technische Universität Dresden, 3Department of Public Health and Primary Care, University of Cambridge
Other articles by Alexander Francke on PubMed
Generation of Mature Murine Monocytes from Heterogeneous Bone Marrow and Description of Their Properties The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society. Sep, 2011 | Pubmed ID: 21705645 Monocytes are involved in a wide range of physiological and pathological processes, many of which are studied in mouse models. Current protocols to isolate murine monocytes are few and result in unsatisfactory cell yield and purity. Here, we describe a novel approach to efficiently differentiate large numbers of mature inflammatory monocytes from heterogeneous bone marrow cell suspensions. Bone marrow cell suspensions were isolated by flushing femurs and tibias from Balb/c and C57Bl/6 mice, supplemented with macrophage colony-stimulating factor (M-CSF), and were cultured on ultra-low attachment surfaces to inhibit adherence-mediated maturation. Cells were harvested at indicated time points, underwent time-line analysis of the differentiation processes, and were subsequently extensively phenotyped to verify their monocytotic properties. In order to confirm downstream compatibility, we tested for typical monocyte behavior. Our protocol yielded 24 Â± 6 Ã— 10(6) differentiated cells per donor mouse, 10-fold higher than yields obtained using previously described peripheral blood isolation methods. Differentiated cells consisted of approximately 47% Â± 12% monocytes, the rest being mature macrophages. We increased monocyte purity to 86% Â± 6% by depleting adherent macrophages. Our findings indicate that bone marrow-derived monocytes (BMDMs) are an attractive tool to study, for example, the innate and adaptive immune system, atherosclerosis, and cellular migration during infection. Moreover, BMDM transplantation could be used to test novel, therapeutic in vivo approaches in mice disease models.
Transplantation of Bone Marrow Derived Monocytes: a Novel Approach for Augmentation of Arteriogenesis in a Murine Model of Femoral Artery Ligation American Journal of Translational Research. 2013 | Pubmed ID: 23573361 Therapeutic augmentation of collateral artery growth (arteriogenesis) is of tremendous clinical interest. Since monocytes home to areas of arteriogenesis and create a local arteriogeneic milieu by secreting a wide range of growth factors, we followed the idea of utilizing these cells for augmentation of collateral growth. For that purpose, we adoptively transferred both syngeneic (same strain) and allogeneic (different strain) bone marrow derived monocytes (BMDMs) into balb/c mice 24 h after femoral artery ligation. Restoration of hind-limb perfusion was determined by Laser Doppler Perfusion Imaging and histological workup. While syngeneic cell transplantation did not augment arteriogenesis in comparison to non-transplanted animals (PI = 0.56 ± 0.06 vs. 0.48 ± 0.09, respectively, ns), allogeneic monocytes massively promoted the collateralization (PI = 0.85 ± 0.14, p < 0.001). Homed monocytes were visualized near growing collateral vessels by staining the cells with the lipophil fluorochrome DiI prior to transplantation. To analyze whether the effect of allogeneic BMDM transplantations is due to local inflammation triggered by a host-versus-graft reaction, transplant recipients were pre-treated with the immunosuppressive drug cyclosporine A, which completely prevented the effect of allogeineic monocyte transplantation (PI = 0.45 ± 0.06, p < 0.001). Here, we have demonstrated murine allogeneic monocytes to be an attractive way to trigger local inflammatory responses near growing collateral vessels and stimulate their adaption, overcoming the endogenous restriction of collateral vessel growth.
Tetanus Toxoid-pulsed Monocyte Vaccination for Augmentation of Collateral Vessel Growth Journal of the American Heart Association. 2014 | Pubmed ID: 24732919 The pathogenesis of collateral growth (arteriogenesis) has been linked to both the innate and adaptive immune systems. While therapeutic approaches for the augmentation of arteriogenesis have focused on innate immunity, exploiting both innate and adaptive immune responses has not been examined. We hypothesized that tetanus toxoid (tt) immunization of mice followed by transplantation of monocytes (Mo) exposed ex vivo to tt augments arteriogenesis after ligation of the hind limb.