Shibani Pati

University of California, San Francisco, San Francisco, California, United States

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Publications (63)231.62 Total impact

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    ABSTRACT: We have shown in a rodent model of hemorrhagic shock (HS) that fresh frozen plasma (FFP) reduces lung inflammation and injury which are correlated with restitution of syndecan-1. Since the gut is believed to contribute to distant organ injury and inflammation after shock, the current study sought to determine if the protective effects of plasma would extend to the gut and to elucidate the contribution of syndecan-1 to this protective effect. We also examined the potential role of TNFα, and a disintegrin and metalloproteinase (ADAM)-17, both intestinal sheddases of syndecan-1. Wild-type (WT) and syndecan-1 (KO) mice were subjected to HS followed by resuscitation with lactated ringers (LR) or FFP and compared to shock alone and shams. Small bowel and blood were obtained after 3 hours for analysis of mucosal injury and inflammation and TNFα and ADAM-17 protein expression and activity. After HS, gut injury and inflammation were significantly increased compared to shams. Resuscitation with LR decreased both injury and inflammation which were further lessened by FFP. KO mice displayed worsened gut injury and inflammation after HS compared to WT mice, and LR and FFP equivalently inhibited injury and inflammation. Both systemic and intestinal TNFα and ADAM-17 followed similar trends, with increases after HS, reduction by LR, and a further decrease by FFP in WT but not KO mice. In conclusion, FFP decreased gut injury and inflammation after hemorrhagic shock, an effect that was abrogated in syndecan-1 mice. Plasma also decreased TNFα and ADAM-17, representing a potential mechanistic link to its protection via syndecan-1.
    Shock (Augusta, Ga.) 08/2015; DOI:10.1097/SHK.0000000000000452 · 2.73 Impact Factor
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    ABSTRACT: Mesenchymal stem cells (MSCs) have been shown to have potent therapeutic effects in a number of disorders including Traumatic Brain Injury (TBI). However, the molecular mechanism(s) underlying these protective effects are largely unknown. Herein we demonstrate that Tissue Inhibitor of Matrix metalloproteinase-3 (TIMP3), a soluble protein released by MSCs, is neuroprotective and enhances neuronal survival and neurite outgrowth in vitro. In vivo in a murine model of TBI, intravenous (IV) recombinant TIMP3 enhances dendritic outgrowth and abrogates loss of hippocampal neural stem cells and mature neurons. Mechanistically we demonstrate in vitro and in vivo that TIMP3-mediated neuroprotection is critically dependent on activation of the Akt-mTORC1 pathway. In support of the neuroprotective effect of TIMP3 we find that intravenous delivery of recombinant TIMP3 attenuates deficits in hippocampal-dependent neurocognition. Taken together our data strongly suggest that TIMP3 has direct neuroprotective effects that can mitigate the deleterious effects associated with TBI, an area with few if any therapeutic options. This article is protected by copyright. All rights reserved. © 2015 AlphaMed Press.
    Stem Cells 08/2015; DOI:10.1002/stem.2189 · 7.70 Impact Factor
  • Cytotherapy 06/2015; 17(6):S16. DOI:10.1016/j.jcyt.2015.03.338 · 3.10 Impact Factor
  • Cytotherapy 06/2015; 17(6):S46. DOI:10.1016/j.jcyt.2015.03.468 · 3.10 Impact Factor
  • Cytotherapy 06/2015; 17(6):S77-S78. DOI:10.1016/j.jcyt.2015.03.578 · 3.10 Impact Factor
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    ABSTRACT: In retrospective and prospective observational studies, fresh frozen plasma (FFP) has been associated with a survival benefit in massively transfused trauma patients. A dry plasma product, such as spray-dried plasma (SDP), offers logistical advantages over FFP. Recent studies on FFP have demonstrated that FFP modulates systemic vascular stability and inflammation. The effect of SDP on these measures has not been previously examined. This study compares SDP with FFP using in vitro assays of endothelial function and in vivo assays of lung injury using a mouse model of hemorrhagic shock (HS) and trauma. FFP, SDP, and lactated Ringer's (LR) solution were compared in vitro using assays of endothelial cell (EC) permeability, cytokine production and content, gene expression, as well as tight and adherens junction stability. All resuscitation products were also compared in a murine model of HS. Mean arterial pressures and physiologic measures were assessed. Pulmonary vascular permeability was measured using tagged dextran. Lung tissues were stained for CD68, VE-cadherin, and occludin. Treatment of ECs with FFP and SDP, but not LR, preserved the integrity of EC monolayers in vitro and resulted in similar EC gene expression patterns and cytokine/growth factor production. FFP and SDP also reduced HS-induced pulmonary vascular permeability in vivo to the same extent. In mice with HS, mean arterial pressures and base excess were corrected by both FFP and SDP to levels observed in sham-treated mice. Treatment after HS with FFP and SDP but not LR solution reduce alveolar wall thickening, leukocyte infiltration, and the breakdown of EC junctions, as measured by staining for VE-cadherin, and occludin. Both FFP and SDP similarly modulate pulmonary vascular integrity, permeability, and inflammation in vitro and in vivo in a murine model of HS and trauma.
    Journal of Trauma and Acute Care Surgery 06/2015; 78(6 Suppl 1 Remote Damage Control Resuscitation Symposium 6):S7-S17. DOI:10.1097/TA.0000000000000630 · 1.97 Impact Factor
  • Rosemary A Kozar · Shibani Pati
    06/2015; 78(6 Suppl 1 Remote Damage Control Resuscitation Symposium 6):S83-S86. DOI:10.1097/TA.0000000000000631
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    ABSTRACT: Plasma can be manufactured by multiple methods. Few studies have compared quality parameters between plasma products that may affect efficacy and safety. Four different plasma products were analyzed to include fresh frozen plasma (FFP), liquid plasma (LP), solvent detergent plasma (SDP), and a spray-dried, solvent detergent-treated plasma (SD-SDP) at multiple time points of storage. Parameters measured included red blood cell, platelet, and white blood cell counts; microparticle phenotypes; thrombin generation; and thrombelastography. These parameters were compared in 10 samples of each product. SDP and SD-SDP contained the smallest number of residual cells compared with FFP and LP. Platelets were the most common residual cell in all products and were highest in LP. FFP contained the greatest number of residual red blood cells. Total microparticle counts were elevated in LP and FFP compared with SDP and SD-SDP. Cell-derived microparticles in both LP and FFP were mostly platelet in origin. Microparticle counts in SDP and SD-SDP were negligible. Thrombelastography results demonstrated similar thrombin, fibrinogen, and platelet function on Day 28 LP compared with Day 5 thawed FFP. Thrombin generation assays revealed that the total, lag time to, and peak thrombin formation were higher in SDP and SD-SDP compared with FFP and LP. All parameters in FFP and LP products were characterized by a large degree of variability. The differences in cellular, microparticle, and functional hemostatic parameters measured between plasma products have the potential to affect efficacy and safety. Further study is needed to elucidate the potential immune effects of the cellular and microparticle differences noted as well as the clinical implications of altered thrombin generation kinetics in SD products.
    06/2015; 78(6 Suppl 1 Remote Damage Control Resuscitation Symposium 6):S18-S25. DOI:10.1097/TA.0000000000000629
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    ABSTRACT: Background The endothelial glycocalyx layer (EGL) is a key regulator of vascular permeability, cell adhesion, and inflammation. The EGL is primarily composed of syndecan-1, hyaluronic acid (HA), heparan sulfate (HS) and chondroitin sulfate (CS). While many studies have observed increased shedding of syndecan-1 during hemorrhagic shock, little is known about the shedding of other EGL components, and their effects on altered permeability and coagulation. We characterized shedding of all four primary components of the EGL, as well as the plasma’s effect on permeability and thrombin generation in a cohort of trauma patients. Methods Plasma samples were collected from 5 healthy consented volunteers and 22 severely injured trauma patients upon admission to the emergency department. ELISA assays were performed to quantify shed HA, HS, CS and syndecan-1 in plasma. A colloid osmometer and Electric Cell-substrate Impedance Sensing (ECIS) system were used to measure plasma colloid osmotic pressure (COP) and cell permeability, respectively. Thrombin generation was measured using a calibrated automated thrombogram (CAT). Initial vital signs, routine laboratory values, and injury severity scores (ISS) were recorded. Non-parametric statistical tests were used to compare differences between groups. Results We observed increased shedding of all four proteins in trauma patient plasma compared to healthy controls: 31.7 vs. 21.2 U/L of CS, 175.8 vs. 121.9 ng/ml of HS, 946.7 vs. 618.6 ng/ml of HA and 245.8 vs. 31.6 ng/ml of syndecan-1 (all p < 0.05). Patients with low plasma COP (≤16 mmHg) had significantly increased syndecan-1 and HA compared to those with normal COP, which corresponded to increased cell permeability via ECIS. CS and HS did not vary between COP groups. Lastly, patients with low COP displayed reduced peak thrombin generation of less than 250 nM on average (p < 0.05). Conclusions Glycocalyx components were shed more in trauma patients compared to healthy controls in this cohort. However, only syndecan-1 and HA shedding were significantly higher in patients with reduced plasma COP. Thrombin generation was impaired in patients with low plasma COP. These data suggest that low plasma COP correlates well to glycocalyx degradation and thrombin loss following trauma, which consequently affect permeability and coagulation.
    Journal of Translational Medicine 04/2015; 13(1). DOI:10.1186/s12967-015-0481-5 · 3.99 Impact Factor
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    ABSTRACT: Mounting evidence highlighting the benefits of hemostatic resuscitation has led to a renewed interest in whole blood (WB) and reconstituted WB (RWB). However, few data exist to characterize the clotting profiles of these variants. This study characterizes banked WB variants and RWB in standard 1:1:1 and 2:1:1 transfusion ratios of packed red blood cells, fresh frozen plasma, and platelets (PLTs). We hypothesized that the global hemostatic profile of 1:1:1 RWB is superior to 2:1:1 RWB and that PLT-modified WB (MWB) is superior to 1:1:1 RWB.
    Journal of Trauma and Acute Care Surgery 07/2014; DOI:10.1097/TA.0000000000000354 · 1.97 Impact Factor
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    ABSTRACT: BACKGROUND: Thawed fresh frozen plasma (TP) is a preferred plasma product for resuscitation but can only be used for up to 5 days after thawing. Never-frozen, liquid plasma (LQP) is approved for up to 26 days when stored at 1 degrees C to 6 degrees C. We have previously shown that TP repairs tumor necrosis factor alpha (TNF-alpha)-induced permeability in human endothelial cells (ECs). We hypothesized that stored LQP repairs permeability as effectively as TP. METHODS: Three single-donor LQP units were pooled. Aliquots were frozen, and samples were thawed on Day 0 (TP0) then refrigerated for 5 days (TP5). The remaining LQP was kept refrigerated for 28 days, and aliquots were analyzed every 7 days. The EC monolayer was stimulated with TNF-alpha (10 ng/mL), inducing permeability, followed by a treatment with TP0, TP5, or LQP aged 0, 7, 14, 21, and 28 days. Permeability was measured by leakage of fluorescein isothiocyanate-dextran through the EC monolayer. Hemostatic profiles of samples were evaluated by thrombogram and thromboelastogram. Statistical analysis was performed using two-way analysis of variance, with p < 0.05 deemed significant. RESULTS: TNF-alpha increased permeability of the EC monolayer twofold compared with medium control. There was a significant decrease in permeability at 0; 7, 14, 21, and 28 days when LQP was used to treat TNF-alpha induced EC monolayers (p < 0.001). LQP was as effective as TP0 and TP5 at reducing permeability. Stored LQP retained the capacity to generate thrombin and form a clot. CONCLUSION: LQP corrected TNF-alpha induced EC permeability and preserved hemostatic potential after 28 days of storage, similar to TP stored for 5 days. The significant logistical benefit (fivefold) of prolonged LQP storage improves the immediate availability of plasma as a primary resuscitative fluid for bleeding patients. Copyright (C) 2014 by Lippincott Williams & Wilkins
    Journal of Trauma and Acute Care Surgery 07/2014; 77(1):28-33. DOI:10.1097/TA.0000000000000276 · 1.97 Impact Factor
  • Shock (Augusta, Ga.) 01/2014; DOI:10.1097/SHK.0000000000000140 · 2.73 Impact Factor
  • John B Holcomb · Shibani Pati
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    ABSTRACT: Over the past century, blood banking and transfusion practices have moved from whole blood therapy to components. In trauma patients, the shift to component therapy was achieved without clinically validating which patients needed which blood products. Over the past 4 decades, this lack of clinical validation has led to uncertainty on how to optimally use blood products and has likely resulted in both overuse and underuse in injured patients. However, recent data from both US military operations and civilian trauma centers have shown a survival advantage with a balanced transfusion ratio of RBCs, plasma, and platelets. This has been extended to include the prehospital arena, where thawed plasma, RBCs, and antifibrinolytics are becoming more widely used. The Texas Trauma Institute in Houston has followed this progression by putting RBCs and thawed plasma in the emergency department and liquid plasma and RBCs on helicopters, transfusing platelets earlier, and using thromboelastogram-guided approaches. These changes have not only resulted in improved outcomes, but have also decreased inflammatory complications, operations, and overall use of blood products. In addition, studies have shown that resuscitating with plasma (instead of crystalloid) repairs the "endotheliopathy of trauma," or the systemic endothelial injury and dysfunction that lead to coagulation disturbances and inflammation. Data from the Trauma Outcomes Group, the Prospective Observational Multicenter Major Trauma Transfusion (PROMMTT) study, and the ongoing Pragmatic Randomized Optimal Platelet and Plasma Ratios (PROPPR) trial represent a decade-long effort to programmatically determine optimal resuscitation practices, balancing risk versus benefits. With injury as the leading cause of death in patients age 1 to 44 years and hemorrhage the leading cause of potentially preventable death in this group, high-quality data must be obtained to provide superior care to the civilian and combat injured.
    Hematology 12/2013; 2013:656-9. DOI:10.1182/asheducation-2013.1.656 · 2.86 Impact Factor
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    ABSTRACT: Autologous bone marrow-derived mononuclear cells (AMNCs) have shown therapeutic promise for central nervous system insults such as stroke and traumatic brain injury (TBI). We hypothesized that intravenous injection of AMNC provides neuroprotection, which leads to cognitive improvement after TBI. A controlled cortical impact (CCI) rodent TBI model was used to examine blood-brain barrier (BBB) permeability, neuronal and glial apoptosis, as well as cognitive behavior. Two groups of rats underwent CCI with (CCI-autologous) or without AMNC treatment (CCI-alone), consisting of 2 million AMNC per kilogram body weight harvested from the tibia and intravenously injected 72 hours after injury. CCI-alone animals underwent sham harvests and received vehicle injections. Ninety-six hours after injury, AMNC significantly reduced the BBB permeability in injured animals, and there was an increase in apoptosis of proinflammatory activated microglia in the ipsilateral hippocampus. At 4 weeks after injury, we examined changes in spatial memory after TBI owing to AMNC treatment. There was a significant improvement in probe testing of CCI-autologous group in comparison with CCI-alone in the Morris Water Maze paradigm. Our data demonstrate that the intravenous injection of AMNC after TBI leads to neuroprotection by preserving early BBB integrity and increasing activated microglial apoptosis. In addition, AMNC also improves cognitive function.
    08/2013; 75(3). DOI:10.1097/TA.0b013e31829617c6
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    ABSTRACT: We have recently demonstrated that injured patients in hemorrhagic shock shed syndecan-1 and that the early use of fresh frozen plasma (FFP) in these patients is correlated with improved clinical outcomes. As the lungs are frequently injured after trauma, we hypothesized that hemorrhagic shock-induced shedding of syndecan-1 exposes the underlying pulmonary vascular endothelium to injury resulting in inflammation and hyperpermeability, and that these effects would be mitigated by FFP. In vitro, pulmonary endothelial permeability, endothelial monolayer flux, transendothelial electrical resistance (TER), and leukocyte-endothelial binding were measured in pulmonary endothelial cells after incubation with equal volumes of FFP or lactated Ringers (LR). In vivo, using a coagulopathic mouse model of trauma and hemorrhagic shock, pulmonary hyperpermeability, neutrophil infiltration, and syndecan-1 expression and systemic shedding were assessed after three hours of resuscitation with either 1XFFP or 3XLR and compared to shock alone and shams. In vitro, endothelial permeability and flux were decreased, TER was increased, and leukocyte-endothelial binding was inhibited by FFP compared to LR treated endothelial cells. In vivo, hemorrhagic shock was associated with systemic shedding of syndecan-1 which correlated with decreased pulmonary sydnecan-1 and increased pulmonary vascular hyperpermeability and inflammation. FFP resuscitation, compared to LR resuscitation, abrogated these injurious effects. After hemorrhagic shock, FFP resuscitation inhibits endothelial cell hyperpermeability and inflammation and restores pulmonary syndecan-1 expression. Modulation of pulmonary syndecan-1 expression may mechanistically contribute to the beneficial effects FFP.
    Shock (Augusta, Ga.) 06/2013; 40(3). DOI:10.1097/SHK.0b013e31829f91fc · 2.73 Impact Factor
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    ABSTRACT: Sunitinib malate is a multitargeted receptor tyrosine kinase inhibitor used in the treatment of human malignancies. A substantial number of sunitinib-treated patients develop cardiac dysfunction, but the mechanism of sunitinib-induced cardiotoxicity is poorly understood. We show that mice treated with sunitinib develop cardiac and coronary microvascular dysfunction and exhibit an impaired cardiac response to stress. The physiological changes caused by treatment with sunitinib are accompanied by a substantial depletion of coronary microvascular pericytes. Pericytes are a cell type that is dependent on intact platelet-derived growth factor receptor (PDGFR) signaling but whose role in the heart is poorly defined. Sunitinib-induced pericyte depletion and coronary microvascular dysfunction are recapitulated by CP-673451, a structurally distinct PDGFR inhibitor, confirming the role of PDGFR in pericyte survival. Thalidomide, an anticancer agent that is known to exert beneficial effects on pericyte survival and function, prevents sunitinib-induced pericyte cell death in vitro and prevents sunitinib-induced cardiotoxicity in vivo in a mouse model. Our findings suggest that pericytes are the primary cellular target of sunitinib-induced cardiotoxicity and reveal the pericyte as a cell type of concern in the regulation of coronary microvascular function. Furthermore, our data provide preliminary evidence that thalidomide may prevent cardiotoxicity in sunitinib-treated cancer patients.
    Science translational medicine 05/2013; 5(187):187ra69. DOI:10.1126/scitranslmed.3005066 · 14.41 Impact Factor
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    ABSTRACT: Background After major traumatic injury, patients often require multiple transfusions of fresh frozen plasma (FFP) to correct coagulopathy and to reduce bleeding. A spray-dried plasma (SDP) product has several logistical benefits over FFP use in trauma patients with coagulopathy. These benefits include ease of transport, stability at room temperature, and rapid reconstitution for infusion. Our past work suggests that FFP promotes endothelial stability by inhibiting endothelial permeability.Study Design and Methods The main goal of this project is to determine if solvent-detergent-treated SDP is equivalent to FFP in inhibiting vascular endothelial cell (EC) permeability and inflammation in vitro. Furthermore, this study aimed to determine if solvent-detergent treatment and spray drying of plasma alters the protective effects of FFP on EC function. The five groups tested in our studies are the following: 1) fresh frozen-thawed plasma (FFP); 2) solvent-detergent-treated FFP; 3) solvent-detergent-treated SDP; 4) lactated Ringer's solution; and 5) Hextend.ResultsThis study demonstrates that in vitro SDP and FFP equivalently inhibit vascular EC permeability, EC adherens junction breakdown, and endothelial white blood cell binding, an effect that is independent of changes in Vascular Cell Adhesion Molecule 1, Intracellular Adhesion Molecule 1, or E-selectin expression on ECs. Solvent-detergent treatment of FFP does not alter the protective effects of FFP on endothelial cell function in vitro.Conclusion These data suggest the equivalence of FFP and SDP on modulation of endothelial function and inflammation in vitro.
    Transfusion 01/2013; 53(S1):80s-90S. DOI:10.1111/trf.12040 · 3.57 Impact Factor
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    ABSTRACT: Mesenchymal stem cells (MSCs) may be useful for treating a variety of disease states associated with vascular instability including traumatic brain injury (TBI). A soluble factor, tissue inhibitor of matrix metalloproteinase-3 (TIMP3), produced by MSCs is shown to recapitulate the beneficial effects of MSCs on endothelial function and to ameliorate the effects of a compromised blood-brain barrier (BBB) due to TBI. Intravenous administration of recombinant TIMP3 inhibited BBB permeability caused by TBI, whereas attenuation of TIMP3 expression in intravenously administered MSCs blocked the beneficial effects of the MSCs on BBB permeability and stability. MSCs increased circulating concentrations of soluble TIMP3, which blocked vascular endothelial growth factor-A-induced breakdown of endothelial cell adherens junctions in vitro and in vivo. These findings elucidate a potential molecular mechanism for the beneficial effects of MSCs on the BBB after TBI and demonstrate a role for TIMP3 in the regulation of BBB integrity.
    Science translational medicine 11/2012; 4(161):161ra150. DOI:10.1126/scitranslmed.3004660 · 14.41 Impact Factor
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    ABSTRACT: Introduction We have demonstrated previously that the intravenous delivery of multipotent adult progenitor cells (MAPC) after traumatic brain injury affords neuroprotection via interaction with splenocytes, leading to an increase in systemic anti-inflammatory cytokines. We hypothesize that the observed modulation of the systemic inflammatory milieu is related to T regulatory cells and a subsequent increase in the locoregional neuroprotective M2 macrophage population. Methods C57B6 mice were injected with intravenous MAPC 2 and 24 hours after controlled cortical impact injury. Animals were euthanized 24, 48, 72, and 120 hours after injury. In vivo, the proportion of CD4+/CD25+/FOXP3+ T-regulatory cells were measured in the splenocyte population and plasma. In addition, the brain CD86+ M1 and CD206+ M2 macrophage populations were quantified. A series of in vitro co-cultures were completed to investigate the need for direct MAPC:splenocyte contact as well as the effect of MAPC therapy on M1 and M2 macrophage subtype apoptosis and proliferation. Results Significant increases in the splenocyte and plasma T regulatory cell populations were observed with MAPC therapy at 24 and 48 hours, respectively. In addition, MAPC therapy was associated with an increase in the brain M2/M1 macrophage ratio at 24, 48 and 120 hours after cortical injury. In vitro cultures of activated microglia with supernatant derived from MAPC:splenocyte co-cultures also demonstrated an increase in the M2/M1 ratio. The observed changes were secondary to an increase in M1 macrophage apoptosis. Conclusions The data show that the intravenous delivery of MAPC after cortical injury results in increases in T regulatory cells in splenocytes and plasma with a concordant increase in the locoregional M2/M1 macrophage ratio. Direct contact between the MAPC and splenocytes is required to modulate activated microglia, adding further evidence to the central role of the spleen in MAPC-mediated neuroprotection.
    Journal of Neuroinflammation 09/2012; 9(1):228. DOI:10.1186/1742-2094-9-228 · 4.90 Impact Factor

Publication Stats

2k Citations
231.62 Total Impact Points

Institutions

  • 2013–2015
    • University of California, San Francisco
      • Department of Laboratory Medicine
      San Francisco, California, United States
    • University of Houston
      Houston, Texas, United States
  • 2012–2015
    • Blood Systems Research Institute
      San Francisco, California, United States
  • 2009–2013
    • University of Texas Medical School
      • • Department of Surgery
      • • Department of Neurobiology and Anatomy
      Houston, Texas, United States
  • 2010–2011
    • University of Texas Health Science Center at Houston
      • • Department of Surgery
      • • Center for Translational Injury Research (CeTIR)
      Houston, Texas, United States
  • 2000–2010
    • University of Texas MD Anderson Cancer Center
      • • Department of Cardiology
      • • Department of Lymphoma and Myeloma
      Houston, Texas, United States
  • 2008
    • Baylor College of Medicine
      • Department of Physical Medicine & Rehabilitation
      Houston, Texas, United States
  • 2006
    • Columbia University
      New York City, New York, United States
  • 2005–2006
    • University of Maryland, Baltimore
      • Institute of Human Virology
      Baltimore, Maryland, United States
  • 2002
    • Loyola University Maryland
      Baltimore, Maryland, United States