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Kristen Brennand

  • ASSISTANT PROFESSOR Psychiatry
  • ASSISTANT PROFESSOR Neuroscience
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Biography

    Kristen Brennand is a stem cell biologist working to bridge the fields of developmental neuroscience and psychiatry.  A major focus of her work is developing in vitro models for schizophrenia in order to identify novel insights into the molecular and cellular phenotypes of mental illness.  

Research

Schizophrenia (SCZD) is a debilitating psychiatric disorder.  While its characteristic symptoms generally appear late in adolescence, SCZD is thought to be a neurodevelopmental condition, often predated by a prodromal period that can appear in early childhood. Though postmortem studies of SCZD brain tissue typically describe defects in mature neurons, such as reduced neuronal size and spine density in the prefrontal cortex and hippocampus, abnormalities of neuronal organization, particularly in the cortex, have also been reported. Due in part to the lack of live patient material for study, the cellular and molecular mechanisms of disease initiation and progression remain unknown.  Though aberrant migration of human neural progenitor cells (NPCs) and reduced connectivity of human neurons has been hypothesized to contribute to disease initiation, neither mechanism is understood in live human neurons.

Through clinical collaborations, we have obtained skin samples from well-characterized cohorts of children and adults with SCZD as well as samples from healthy controls.  Having reprogrammed these skin cells into human induced pluripotent stem cells (hiPSCs) and directed these hiPSCs to undergo neural differentiation, we can generate near limitless quantities of live healthy and SCZD NPCs and neurons.  By identifying differences between healthy and diseased neurons, we hope to elucidate the mechanisms that result in SCZD and to screen for new drugs with which to reverse the cellular defects contributing to disease.

Publications

Brennand KJ, Simone A, Tran N, Gage FH. Modeling psychiatric disorders at the cellular and network levels. Molecular psychiatry 2012 Apr;.

Brennand KJ, Gage FH. Concise review: the promise of human induced pluripotent stem cell-based studies of schizophrenia. Stem cells (Dayton, Ohio) 2011 Dec; 29(12): 1915-1922.

Woods NB, Parker AS, Moraghebi R, Lutz MK, Firth AL, Brennand KJ, Berggren WT, Raya A, Belmonte JC, Gage FH, Verma IM. Efficient Generation of Hematopoietic Precursors and Progenitors from Human Pluripotent Stem Cell Lines. Stem Cells 2011; 29(7): 1158-1164.

Brennand KJ, Simone A, Jou J, Gelboin-Burkhart C, Tran N, Sangar S, Li Y, Mu Y, Chen G, Yu D, McCarthy S, Sebat J, Gage FH. Modelling schizophrenia using human induced pluripotent stem cells. Nature 2011 May; 473(7346): 221-225.

Rigamonti A, Brennand K, Lau F, Cowan CA. Rapid Cellular Turnover in Adipose Tissue. PLoS One 2011; 6(3).

Kim JE, O'Sullivan ML, Sanchez CA, Hwang M, Israel MA, Brennand K, Deerinck TJ, Goldstein LS, Gage FH, Ellisman MH, Ghosh A. Investigating Synapse Formation and Function Using Human ES and iPS Cell-derived Neurons. PNAS 2011; 108(7): 3005-3010.

Ruiz S, Brennand K, Panopoulos AD, Herrerías A, Gage FH, Izpisua-Belmonte JC. High-efficient generation of induced pluripotent stem cells from human astrocytes. PloS One 2010; 5(12).

Szotek PP, Chang HL, Brennand K, Fujino A, Pieretti-Vanmarcke R, Lo Celso C, Dombkowski D, Preffer F, Cohen KS, Teixeira J, Donahoe PK. Normal ovarian surface epithelial label-retaining cells exhibit stem/progenitor cell characteristics. PNAS 2008; 105(34): 12469-12473.

Stadtfeld M, Brennand K, Hochedlinger K. Reprogramming of pancreatic beta cells into induced pluripotent stem cells. Current Biology 2008; 18(12): 890-894.

Brennand K, Huangfu D, Melton D. All β-cells contribute equally to pancreatic growth and maintenance. PLoS Biology 2007; 5(7): 1520-1529.

Industry Relationships

Physicians and scientists on the faculty of the Icahn School of Medicine at Mount Sinai often interact with pharmaceutical, device and biotechnology companies to improve patient care, develop new therapies and achieve scientific breakthroughs. In order to promote an ethical and transparent environment for conducting research, providing clinical care and teaching, Mount Sinai requires that salaried faculty inform the School of their relationships with such companies.

Dr. Brennand did not report having any of the following types of financial relationships with industry during 2012 and/or 2013: consulting, scientific advisory board, industry-sponsored lectures, service on Board of Directors, participation on industry-sponsored committees, equity ownership valued at greater than 5% of a publicly traded company or any value in a privately held company. Please note that this information may differ from information posted on corporate sites due to timing or classification differences.

Mount Sinai's faculty policies relating to faculty collaboration with industry are posted on our website at http://icahn.mssm.edu/about-us/services-and-resources/faculty-resources/handbooks-and-policies/faculty-handbook. Patients may wish to ask their physician about the activities they perform for companies.

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