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Headshot of Stella Kourembanas

Stella Kourembanas, MDChief, Division of Newborn Medicine Clement A. Smith Professor of Pediatrics; Academic Chair, Harvard Program in Neonatology

Dr. Kourembanas is the Clement A. Smith Professor of Pediatrics at Harvard Medical School, Division Chief of Newborn Medicine at Boston Children’s Hospital, and Academic Chair of the Harvard Neonatal Perinatal Medicine Training Program. She has served as Program Director of a NIH-funded T32 program training physician-scientists in neonatal-perinatal medicine since 2003. She is an Attending Neonatologist with particular interest and expertise on lung diseases of the newborn, pulmonary hypertension, and bronchopulmonary dysplasia and is an internationally recognized expert on the biology of hypoxia and the investigation of stem cell therapies for the treatment of developmental and vascular diseases of the lung. She is an elected member to American Society for Clinical Investigation, the Pediatric Academic Societies, and the Society of Perinatal Research. She has given several State-of-the-Art, Keynote lectures, and named lectureships on her research discoveries at National and International Symposia and has served as standing member of NIH study sections on Lung Biology & Pathology (LBPA), Respiratory Integrative Biology & Translational Research (RIBT), NICHD T32 Study Section, the Hood Foundation, and the Parker B. Francis Fellowship Program. She served as chair of RIBT and NICHD T32 study sections and chair of the Hood Foundation Scientific Review Board.

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Dr. Kourembanas’ research laboratory investigates the molecular and cellular basis of lung inflammation, hypoxic signaling, and developmental lung injury. Using various genetically modified rodent models, the Kourembanas lab has been investigating the pathobiology of pulmonary hypertension and the transcriptional and epigenetic mechanisms by which hypoxia induces chemokine gene expression leading to lung inflammation and lung vascular remodeling.

As a PI on several previous and current NIH-funded grants including a SCOR program, Dr. Kourembanas has led several collaborative basic and translational studies that have contributed new knowledge to the field of lung biology. Most notably, she was among the first to demonstrate that inflammation plays a critical role in the development of hypoxic pulmonary hypertension, an area that has recently received wide interest and has become a major focus of study by lung biologists investigating both, mechanisms of disease, as well as therapeutic strategies targeting lung inflammation to treat lung diseases.

The Kourembanas Laboratory were amongst the first to detail the cell-free paracrine effect of MSCs on preventing and reversing neonatal hyperoxic lung injury in experimental models, paving the way for future cell-free therapy for BPD and other lung diseases. In addition, Dr. Kourembanas has over 3 decades of mentoring scientists in lung biology, many of whom are successful independent investigators and program leaders in their own right.

Dr. Kourembanas’ research laboratory investigates the molecular and cellular basis of lung inflammation, hypoxic signaling, and developmental lung injury. Using various genetically modified rodent models, the Kourembanas lab has been investigating the pathobiology of pulmonary hypertension and the transcriptional and epigenetic mechanisms by which hypoxia induces chemokine gene expression leading to lung inflammation and lung vascular remodeling.

As a PI on several previous and current NIH-funded grants including a SCOR program, Dr. Kourembanas has led several collaborative basic and translational studies that have contributed new knowledge to the field of lung biology. Most notably, she was among the first to demonstrate that inflammation plays a critical role in the development of hypoxic pulmonary hypertension, an area that has recently received wide interest and has become a major focus of study by lung biologists investigating both, mechanisms of disease, as well as therapeutic strategies targeting lung inflammation to treat lung diseases.

The Kourembanas Laboratory were amongst the first to detail the cell-free paracrine effect of MSCs on preventing and reversing neonatal hyperoxic lung injury in experimental models, paving the way for future cell-free therapy for BPD and other lung diseases. In addition, Dr. Kourembanas has over 3 decades of mentoring scientists in lung biology, many of whom are successful independent investigators and program leaders in their own right.

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Headshot of Sam Alex Mitsialis.

S. Alex Mitsialis, PhDAssistant Professor of Pediatrics

Dr. Mitsialis is Assistant Professor of Pediatrics. He obtained his BA in Biochemistry from Princeton University and PhD in Microbiology from Columbia University. He completed post-doctoral training in developmental biology at Harvard University. His research interests focus on the molecular biology of oxygen-induced developmental lung injury and stem cell based protective/repair mechanisms, especially how the pulmonary vasculature monitors and actively responds to changes in oxygen tension triggering gene expression cascades that play profound roles in vascular wall remodeling, vascular tone, and inflammatory processes, as exemplified by hypoxia-induced pulmonary hypertension. He pioneered the work on mesenchymal stromal cell extracellular vesicles (MSC-EVs), a group of small EVs that includes exosomes, as the paracrine mediators of MSC action on dampening inflammation and inhibiting the development of pulmonary hypertension on the hypoxic lung vasculature.

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Dr. Mitsialis has developed several animal models of experimental pulmonary hypertension based on genetically modified mice, utilizing them to understand the molecular basis of this disease, and to decipher, at the molecular level, the pivotal signals that commit the vasculature towards a pathologic state, and how self-defense mechanisms, such as the action of cytoprotective genes or the activation of bone-marrow derived or lung-resident stem cells, can prevent or reverse the disease process.

Dr. Mitsialis has developed several animal models of experimental pulmonary hypertension based on genetically modified mice, utilizing them to understand the molecular basis of this disease, and to decipher, at the molecular level, the pivotal signals that commit the vasculature towards a pathologic state, and how self-defense mechanisms, such as the action of cytoprotective genes or the activation of bone-marrow derived or lung-resident stem cells, can prevent or reverse the disease process.

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Headshot of John Cortinas.

John Cortinas - Research Assistant

Mr. Cortinas completed his undergraduate degree in Biology from the University of Texas Rio Grande Valley. Upon graduating in 2019, he joined the Kourembanas Lab as a research assistant where he is responsible for the isolation and characterization of extracellular vesicles derived from mesenchymal stromal cells. In addition to that, Dr. Cortinas oversees and helps manage the Boston Children’s Hospital ZetaView Nanoparticle Tracking Analysis (NTA) core where he trains users in performing NTA on various biologic and inorganic material.

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Headshot of Ha VanThai.

Ha VanThai, PhDResearch Fellow

Dr. Thai completed his undergraduate studies at the Thai Nguyen University of Medicine and Pharmacy in Pharmacy. Following this, he received a Master’s of Biotechnology and Bioengineering from Sungkyunkwan University and his PhD in Biomedicine from the University of Ljubljana. He joined the Kourembanas Lab in 2021 as a Research Fellow.

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The aim of Dr. Thai’s doctoral studies was to understand the activation of innate immunity by oxidative stress-derived extracellular vesicles in sterile inflammation in comparison to classical inflammation. Through this research, he demonstrated the mechanisms underlying the activation of innate immunity by endogenous agonists released from cells after oxidative stress, which contributes to sterile inflammation in chronic conditions such as rheumatoid arthritis.

Currently, his research is focused on comprehending the long-term impact of MSC-EVs treatment on T cell immunity in double-hit model involving neonatal hyperoxia and house dust mite-allergen challenges. The primary goal of his research is unraveling the reasons why infants with BPD remain at a greater risk of developing respiratory infections and asthma compared to the general population. Moreover, he aims to investigate the mechanism underlying the advantageous effect of MSC-EVs treatment during neonatal exposure to hyperoxia. Specifically, he focuses on elucidating how this treatment normalizes long-lasting T cell responses, thereby reducing the risk of developing severe reaction against foreign allergens.

Dr. Mitsialis has developed several animal models of experimental pulmonary hypertension based on genetically modified mice, utilizing them to understand the molecular basis of this disease, and to decipher, at the molecular level, the pivotal signals that commit the vasculature towards a pathologic state, and how self-defense mechanisms, such as the action of cytoprotective genes or the activation of bone-marrow derived or lung-resident stem cells, can prevent or reverse the disease process.

The aim of Dr. Thai’s doctoral studies was to understand the activation of innate immunity by oxidative stress-derived extracellular vesicles in sterile inflammation in comparison to classical inflammation. Through this research, he demonstrated the mechanisms underlying the activation of innate immunity by endogenous agonists released from cells after oxidative stress, which contributes to sterile inflammation in chronic conditions such as rheumatoid arthritis.

Currently, his research is focused on comprehending the long-term impact of MSC-EVs treatment on T cell immunity in double-hit model involving neonatal hyperoxia and house dust mite-allergen challenges. The primary goal of his research is unraveling the reasons why infants with BPD remain at a greater risk of developing respiratory infections and asthma compared to the general population. Moreover, he aims to investigate the mechanism underlying the advantageous effect of MSC-EVs treatment during neonatal exposure to hyperoxia. Specifically, he focuses on elucidating how this treatment normalizes long-lasting T cell responses, thereby reducing the risk of developing severe reaction against foreign allergens.

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Headshot of Angeles Fernandez-Gonzalez.

Angeles Fernandez-Gonzales, PhDResearch Scientist

Dr. Fernandez-Gonzales completed her undergraduate degree at the Autonoma University of Madrid and her PhD in Biochemistry and Molecular Biology at University of Alcala de Henares, Spain, where she studied the peptidergic alterations occurring in Parkinson's disease. She moved to the United States for her Postdoctoral position where she continued her work on brain amines and peptides, and their relevance to neuronal degeneration.

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She later spent some time at St. Jude Children's Research Hospital where she investigated mechanisms of injury and repair during disease, and the contribution of astrocytes in these processes. In 2003, Dr. Fernandez-Gonzales joined the Department of Newborn Medicine at Boston Children's Hospital where she is currently working to understand how myeloid cells, in particular alveolar macrophages, regulate lung development and pathological responses to injury.

She later spent some time at St. Jude Children's Research Hospital where she investigated mechanisms of injury and repair during disease, and the contribution of astrocytes in these processes. In 2003, Dr. Fernandez-Gonzales joined the Department of Newborn Medicine at Boston Children's Hospital where she is currently working to understand how myeloid cells, in particular alveolar macrophages, regulate lung development and pathological responses to injury.

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Headshot of Stephanie Tung.

Stephanie Tung, MBBCh MSc

Dr. Tung is a graduate of the University of Toronto where she completed her graduate studies in immunology and cancer biology research. She received her medical degree from the Royal College of Surgeons in Ireland then completed her training in pediatrics at the Johns Hopkins Pediatric Residency Program in Baltimore and her neonatology training in the Harvard Neonatal-Perinatal Medicine Fellowship program. Dr. Tung is an Attending Physician in Medicine in the Division of Newborn Medicine at Boston Children’s Hospital and an Instructor of Pediatrics at Harvard Medical School.

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Dr. Tung's research focuses on evaluating the long-term immunologic implications of bronchopulmonary dysplasia and its mechanisms of immune dysregulation.

Dr. Tung's research focuses on evaluating the long-term immunologic implications of bronchopulmonary dysplasia and its mechanisms of immune dysregulation.

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Headshot of Kim Jeong-Ki.

Jeong-Ki Kim, PhDResearch Fellow

Dr. Kim completed his undergraduate studies in Environmental Science & Ecological Engineering and Medical Convergence Engineering from Korea University. He received his PhD in Nano Bio Information Technology from the Graduate School of Converging Science and Technology at Korea University. During his doctoral research, he investigated the effects of biophysical interactions between macrophages and the extracellular matrix on intracellular inflammatory signaling and the associated transcriptional regulatory mechanisms. To dissect the signaling pathways in macrophages, he honed his skills in bioinformatics, advanced microscopy techniques, and high-content image analysis.

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Dr. Kim joined the Kourembanas lab in March 2023, focusing on unraveling the therapeutic mechanisms of purified mesenchymal stem cell-derived extracellular vesicles (MSC-EVs) in bronchopulmonary dysplasia (BPD). Dr. Kim's primary goal is to elucidate the role of MSC-EVs in modulating the differentiation and inflammation of lung-resident myeloid cells in preclinical BPD animal models. Specifically, by investigating the subcellular signaling pathways activated by MSC-EVs in myeloid cell populations, he aims to uncover the principles underlying their transcriptional and epigenetic reprogramming. Ultimately, this research seeks to determine how MSC-EVs facilitate tissue regeneration in lungs exposed to hyperoxia.

Dr. Kim joined the Kourembanas lab in March 2023, focusing on unraveling the therapeutic mechanisms of purified mesenchymal stem cell-derived extracellular vesicles (MSC-EVs) in bronchopulmonary dysplasia (BPD). Dr. Kim's primary goal is to elucidate the role of MSC-EVs in modulating the differentiation and inflammation of lung-resident myeloid cells in preclinical BPD animal models. Specifically, by investigating the subcellular signaling pathways activated by MSC-EVs in myeloid cell populations, he aims to uncover the principles underlying their transcriptional and epigenetic reprogramming. Ultimately, this research seeks to determine how MSC-EVs facilitate tissue regeneration in lungs exposed to hyperoxia.

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Headshot of Xianlan Lui.

Xianlan LiuResearch Technologist

With over 30 years of experience in scientific research, Ms. Liu provides unparalleled technical ability, excelling at molecular and biochemical techniques as well as animal husbandry and physiology studies. She is an integral component of the Kourembanas laboratory team.