The overall goal of this Exploratory Development Research Grant is to investigate whether bacterial infections suppress lymphatic function and thus inhibit immune response. This will lend initial insight into new ways to manage difficult-to-resolve infections, many of which currently require intravenous antibiotic treatment that can lead to antibiotic resistant bacteria strains-another significant problem. The PI is an expert in lymphatic research, especially functional studies using novel intravital imaging technologies and animal models. He has assembled a first class team consisting of Dr. Dai Fukumura, an expert in nitric oxide biology, Dr. Nancy H. Ruddle, an expert in immunobiology, cytokines and autoimmune diseases and Dr. Jean C. Lee, an expert in s. aureus biology and vaccine development. This robust and experienced research team, along with the resources available in the Edwin L. Steele Laboratories, Massachusetts General Hospital and Harvard Medical School, ensure an optimal environment for the innovative studies proposed in this EDRG. Initial lymphatic vessels take up interstitial fluid to create lymph that is transported through collecting lymphatic vessels and lymph nodes, and eventually returned to blood circulation to maintain tissue fluid balance. Antigen and antigen presenting cells (APC) use this route to enter the draining lymph node (LN) and initiate an immune response. Chronic infections, such as in cellulitis, are frequently associated with lymphedema, which is generally associated with malfunctions or disruptions in the function of collecting lymphatic vessels. Cases of cellulitis are responsible for nearly 400,000 hospital admission each year in the US. In this Exploratory Developmental Research Grant proposal we will test the hypothesis that these difficult-to-resolve infections are aided by an impairment of autonomous contraction of lymphatic vessels draining the infected area, thus limiting signaling to the lymph node and causing toxin accumulation at the site of infection. We will use our novel murine model that allows autonomous lymphatic contractions to be imaged and quantified intravitally. We will study the impairment of lymphatic function during s. aureus infection (Aim 1), the role of host derived nitric oxide from myeloid derived suppressor cells in causing lymphatic impairment (Aim 2) and the role of nitric oxide produced by the s. aureus nitric oxide synthase on lymphatic function (Aim 3). To achieve these Aims we will measure the strength of lymphatic contraction, lymphatic flow, antigen transport and duration of infection. We will characterize the biological response to the experimental conditions using standard cell biology, biochemistry and molecular biology techniques.
These aims will enable us to address whether blocking nitric oxide is a therapeutic option to enhance the clearance of bacteria during s. aureus cellulitis. This EDRG proposal lies at the crossroads between immunology and functional lymphatic biology, an intersection that has been understudied to date. The work proposed here will drive this field by applying the principals of lymphatic function to study the important public health problem of s. aureus skin infections.
Chronic skin infections are responsible for over 400,000 hospital admissions in the US each year, many of which require intravenous antibiotic treatment that can ultimately lead to the formation of antibiotic resistant bacteria. Here will study whether nitric oxide produced by either the host or bacteria during infections impairs lymphatic function and thus limits the immune response. We can then use these data to study potential nitric oxide based interventions for the treatment of chronic skin infections, thereby limiting the need for further antibiotics.
|Jones, Dennis; Meijer, Eelco F J; Blatter, Cedric et al. (2018) Methicillin-resistant Staphylococcus aureus causes sustained collecting lymphatic vessel dysfunction. Sci Transl Med 10:|
|Blatter, Cedric; Meijer, Eelco F J; Padera, Timothy P et al. (2018) Simultaneous measurements of lymphatic vessel contraction, flow and valve dynamics in multiple lymphangions using optical coherence tomography. J Biophotonics 11:e201700017|
|Padera, Timothy P; Meijer, Eelco F J; Munn, Lance L (2016) The Lymphatic System in Disease Processes and Cancer Progression. Annu Rev Biomed Eng 18:125-58|
|Baish, James W; Kunert, Christian; Padera, Timothy P et al. (2016) Synchronization and Random Triggering of Lymphatic Vessel Contractions. PLoS Comput Biol 12:e1005231|
|Blatter, Cedric; Meijer, Eelco F J; Nam, Ahhyun S et al. (2016) In vivo label-free measurement of lymph flow velocity and volumetric flow rates using Doppler optical coherence tomography. Sci Rep 6:29035|
|Kunert, Christian; Baish, James W; Liao, Shan et al. (2015) Mechanobiological oscillators control lymph flow. Proc Natl Acad Sci U S A 112:10938-43|
|Pereira, Ethel R; Jones, Dennis; Jung, Keehoon et al. (2015) The lymph node microenvironment and its role in the progression of metastatic cancer. Semin Cell Dev Biol 38:98-105|
|Liao, Shan; Jones, Dennis; Cheng, Gang et al. (2014) Method for the quantitative measurement of collecting lymphatic vessel contraction in mice. J Biol Methods 1:|
|Munn, Lance L; Padera, Timothy P (2014) Imaging the lymphatic system. Microvasc Res 96:55-63|
|Kesler, Cristina T; Liao, Shan; Munn, Lance L et al. (2013) Lymphatic vessels in health and disease. Wiley Interdiscip Rev Syst Biol Med 5:111-24|
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