The main research focus of our group is to develop minimally invasive optical techniques for in vivo imaging and monitoring of cells and tissues as well as therapeutic applications of lasers. The diagnostic techniques will help to answer important biological questions, such as:
- In-vivo monitoring of cell trafficking in circulation
- Imaging of vasculature and microenvironment in tissue
- Interaction of cells with microenvironment
The therapeutic techniques allow us to target cellular and subcellular structures by means of selective absorption of endogenous or exogenous chromophores. Selective targeting may be helpful for treating various pathologies, such as retinal diseases or destruction of tumors, without causing adverse side effects to healthy tissue.
Christodoulou C, Spencer JA, Yeh SA, Turcotte R, Kokkaliaris KD, Panero R, Ramos A, Guo G, Seyedhassantehrani N, Esipova TV, Vinogradov SA, Rudzinskas S, Zhang Y, Perkins AS, Orkin SH, Calogero RA, Schroeder T, Lin CP, Camargo FD Live-animal imaging of native haematopoietic stem and progenitor cells. Nature. 2020;578(7794):278-283 - PMID: 32025033 - PMCID: PMC7021587 - DOI: 10.1038/s41586-020-1971-z
Park SY, Matte A, Jung Y, Ryu J, Wilson AB, Han EYA, Liu M, Carbone C, Melisi D, Nagasawa T, Locascio JJ, Lin CP, Silberstein LE, De Franceschi L Pathologic angiogenesis in the bone marrow of humanized sickle cell mice is reversible by blood transfusion. Blood. 2020;135(23):2071-2084 - PMID: 31990287 - PMCID: PMC7273832 - DOI: 10.1182/blood.2019002227
Patil R, Tan X, Bartosik P, Detappe A, Runnels JM, Ghobrial I, Lin CP, Niedre M Fluorescence monitoring of rare circulating tumor cell and cluster dissemination in a multiple myeloma xenograft model in vivo. J Biomed Opt. 2019;24(8):1-11 - PMID: 31456386 - PMCID: PMC6983486 - DOI: 10.1117/1.JBO.24.8.085004
Bassir SH, Garakani S, Wilk K, Aldawood ZA, Hou J, Yeh SA, Sfeir C, Lin CP, Intini G Prx1 Expressing Cells Are Required for Periodontal Regeneration of the Mouse Incisor. Front Physiol. 2019;10:591 - PMID: 31231227 - PMCID: PMC6558369 - DOI: 10.3389/fphys.2019.00591
Scaramozza A, Park D, Kollu S, Beerman I, Sun X, Rossi DJ, Lin CP, Scadden DT, Crist C, Brack AS Lineage Tracing Reveals a Subset of Reserve Muscle Stem Cells Capable of Clonal Expansion under Stress. Cell Stem Cell. 2019;24(6):944-957.e5 - PMID: 31006621 - PMCID: PMC6597014 - DOI: 10.1016/j.stem.2019.03.020
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Imaging modalities such as confocal reflectance microscopy, fluorescence by single- or two-photon excitation, second harmonic generation and coherent anti-Stokes Raman spectroscopy (CARS) provide different contrast mechanisms that can be combined to give structural, functional and molecular information of living tissue. Our group has developed a multimodal microscope in which up to three of these imaging modalities can be realized simultaneously. Images are acquired at video rate, which allows real-time monitoring of fast events in the living tissue.
Ophthalmic imaging resolution suffers from aberrations present in the eye. With the introduction of an adaptive optics (AO) system into a scanning laser ophthalmascope (SLO) one can achieve the best possible resolution for the system. We have implemented such an AO system into a SLO designed for imaging the mouse retina.
In vivo flow cytometry
Role of IKK-ß in Akt activation and vascular permeability. Evans blue dye was injected into a transgenic (TG) and control mouse (CM). Images were taken at 1:30 and 10:00 minutes after injection. Increased vessel leakage was shown in the TG mouse, due to the deletion of IKK-ß, which reduces activation of Akt, and increases vascular permeability.
Comparison of the adhesion of native blood leukocytes (NL) and C-GSF mobilized peripheral blood leukocytes (ML). An image comparing the adhesion of these cells in the vascular endothelium is shown along with a measurement of the number of adhered cells.
A) Image of regulatory T cells (FOXP3-GFP) that have migrated to the islet graft after adoptive transfer. B) Image of effector T cells (U-DsRed) acquired at the same time as A. C) Co-registered image revealing natural regulatory T cells (green), effector T cells (red), and a converted regulatory T cell (yellow).
Simultaneous, independent detection of GFP+ regulatory T cells (blue) and DSRed+ naïve T cells (red).
Investigation of T cell migration in graft versus host disease (GVHD). Images of transplanted T cells near a hair follicle in a (A) freshly irradiated mouse and (B) mixed Chimera (MC) mouse 5 days after transplantation. T cell counts after 5 and 12 days in the irradiated mouse (C) and MC (D). Images of T cells 5 days after transplantation near postcapillary venules in the freshly irradiated mouse (E) and the MC (F).
Stem Cell Biology
In vivo confocal and 2-photon microscopy demonstrating the extravasation of FTVI treated MSCs and subsequent migration to the bone surface in the mouse bone marrow after adoptive transfer. DiD-labeled MSCs (red), primarily line the vessel walls (green) at 1 hr after transfer A), whereas at 24 hrs B), the MSCs show a marked increase in extravasation (arrow). Second Harmonic Generation microscopy of bone (collagen, blue) reveals the close juxtaposition between the cells and the bone after 9 days. The bone image in D) is 10µm above the image in C). Bar=50µm for A-B) and 100µm for C-D).