1
|
Larouche JA, Wallace EC, Spence BD, Buras E, Aguilar CA. Spatiotemporal mapping of immune and stem cell dysregulation after volumetric muscle loss. JCI Insight 2023; 8:162835. [PMID: 36821376 PMCID: PMC10132146 DOI: 10.1172/jci.insight.162835] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 02/21/2023] [Indexed: 02/24/2023] Open
Abstract
Volumetric muscle loss (VML) is an acute trauma that results in persistent inflammation, supplantation of muscle tissue with fibrotic scarring, and decreased muscle function. The cell types, nature of cellular communication, and tissue locations that drive the aberrant VML response have remained elusive. Herein, we used spatial transcriptomics on a mouse model of VML and observed VML engenders a unique spatial pro-fibrotic pattern driven by crosstalk between fibrotic and inflammatory macrophages and mesenchymal derived cells. The dysregulated response impinged on muscle stem cell mediated repair, and targeting this circuit resulted in increased regeneration and reductions in inflammation and fibrosis. Collectively, these results enhance our understanding of the cellular crosstalk that drives aberrant regeneration and provides further insight into possible avenues for fibrotic therapy exploration.
Collapse
Affiliation(s)
- Jacqueline A Larouche
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, United States of America
| | - Emily C Wallace
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, United States of America
| | - Bonnie D Spence
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, United States of America
| | - Eric Buras
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, United States of America
| | - Carlos A Aguilar
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, United States of America
| |
Collapse
|
2
|
Buras E, Converso-Baran K, Davis C, Michele D, Brooks S, Chun TH. SUN-099 Fibro-adipogenic Remodeling Of The Diaphragm In Obesity-associated Respiratory Dysfunction. J Endocr Soc 2019. [PMCID: PMC6552850 DOI: 10.1210/js.2019-sun-099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Respiratory dysfunction is a common complication of obesity, conferring cardiovascular morbidity, increased mortality and often necessitating mechanical ventilatory support. While impaired lung expansion in the setting of increased adipose mass and reduced central response to hypercapnia have been implicated as pathophysiological drivers, the impact of obesity on respiratory muscles--in particular, the diaphragm--has not been investigated in detail. In this study, we demonstrate that chronic high-fat diet (HFD)-feeding impairs diaphragm muscle function, as assessed in vivo by ultrasonography and ex vivo by measurement of contractile force. During a HFD time course, progressive adipose tissue expansion and collagen deposition within the diaphragm parallel contractile deficits. Moreover, intra-diaphragmatic fibro-adipogenic progenitors (FAPs) proliferate with long-term HFD-feeding while giving rise to adipocytes and type I collagen-depositing fibroblasts. Thrombospondin-1 (THBS1), a circulating adipokine, increases with obesity and induces FAP proliferation. These findings suggest a novel role for FAP-mediated fibro-adipogenic diaphragm remodeling in obesity-associated respiratory dysfunction.
Collapse
Affiliation(s)
- Eric Buras
- University of Michigan, Ann Arbor, MI, United States
| | | | - Carol Davis
- University of Michigan, Ann Arbor, MI, United States
| | | | - Susan Brooks
- University of Michigan, Ann Arbor, MI, United States
| | - Tae-Hwa Chun
- University of Michigan, Ann Arbor, MI, United States
| |
Collapse
|
3
|
Ajluni N, Meral R, Neidert AH, Brady GF, Buras E, McKenna B, DiPaola F, Chenevert TL, Horowitz JF, Buggs-Saxton C, Rupani AR, Thomas PE, Tayeh MK, Innis JW, Omary MB, Conjeevaram H, Oral EA. Spectrum of disease associated with partial lipodystrophy: lessons from a trial cohort. Clin Endocrinol (Oxf) 2017; 86:698-707. [PMID: 28199729 PMCID: PMC5395301 DOI: 10.1111/cen.13311] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 01/18/2017] [Accepted: 02/10/2017] [Indexed: 12/29/2022]
Abstract
CONTEXT Partial lipodystrophy (PL) is associated with metabolic co-morbidities but may go undiagnosed as the disease spectrum is not fully described. OBJECTIVE The objective of the study was to define disease spectrum in PL using genetic, clinical (historical, morphometric) and laboratory characteristics. DESIGN Cross-sectional evaluation. PARTICIPANTS Twenty-three patients (22 with familial, one acquired, 78·3% female, aged 12-64 years) with PL and non-alcoholic fatty liver disease (NAFLD). MEASUREMENTS Genetic, clinical and laboratory characteristics, body composition indices, liver fat content by magnetic resonance imaging (MRI), histopathological and immunofluorescence examinations of liver biopsies. RESULTS Seven patients displayed heterozygous pathogenic variants in LMNA. Two related patients had a heterozygous, likely pathogenic novel variant of POLD1 (NM002691·3: c.3199 G>A; p.E1067K). Most patients had high ratios (>1·5) of percentage fat trunk to percentage fat legs (FMR) when compared to reference normals. Liver fat quantified using MR Dixon method was high (11·3 ± 6·3%) and correlated positively with haemoglobin A1c and triglycerides while leg fat by dual-energy X-ray absorptiometry (DEXA) correlated negatively with triglycerides. In addition to known metabolic comorbidities; chronic pain (78·3%), hypertension (56·5%) and mood disorders (52·2%) were highly prevalent. Mean NAFLD Activity Score (NAS) was 5 ± 1 and 78·3% had fibrosis. LMNA-immunofluorescence staining from select patients (including one with the novel POLD1 variant) showed a high degree of nuclear atypia and disorganization. CONCLUSIONS Partial lipodystrophy is a complex multi-system disorder. Metabolic parameters correlate negatively with extremity fat and positively with liver fat. DEXA-based FMR may prove useful as a diagnostic tool. Nuclear disorganization and atypia may be a common biomarker even in the absence of pathogenic variants in LMNA.
Collapse
Affiliation(s)
- Nevin Ajluni
- Brehm Center for Diabetes Research and Division of Metabolism, Endocrinology & Diabetes, University of Michigan, Ann Arbor, MI, USA
| | - Rasimcan Meral
- Brehm Center for Diabetes Research and Division of Metabolism, Endocrinology & Diabetes, University of Michigan, Ann Arbor, MI, USA
| | - Adam H. Neidert
- Brehm Center for Diabetes Research and Division of Metabolism, Endocrinology & Diabetes, University of Michigan, Ann Arbor, MI, USA
| | - Graham F. Brady
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Eric Buras
- Brehm Center for Diabetes Research and Division of Metabolism, Endocrinology & Diabetes, University of Michigan, Ann Arbor, MI, USA
| | - Barbara McKenna
- Department of Pathology, University of Michigan, Ann Arbor, MI, USA
| | - Frank DiPaola
- Division of Pediatric Gastroenterology, University of Michigan, Ann Arbor, MI, USA
| | | | | | - Colleen Buggs-Saxton
- Pediatric Endocrinology, Children’s Hospital of Michigan, Wayne School of Medicine, Detroit, MI, USA
| | - Amit R. Rupani
- Departments of Pediatrics and Communicable Diseases and Human Genetics, University of Michigan, Ann Arbor, MI, USA
| | - Peedikayil E. Thomas
- Departments of Pediatrics and Communicable Diseases and Human Genetics, University of Michigan, Ann Arbor, MI, USA
| | - Marwan K. Tayeh
- Departments of Pediatrics and Communicable Diseases and Human Genetics, University of Michigan, Ann Arbor, MI, USA
| | - Jeffrey W. Innis
- Departments of Pediatrics and Communicable Diseases and Human Genetics, University of Michigan, Ann Arbor, MI, USA
| | - M. Bishr Omary
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Hari Conjeevaram
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Elif A. Oral
- Brehm Center for Diabetes Research and Division of Metabolism, Endocrinology & Diabetes, University of Michigan, Ann Arbor, MI, USA
| |
Collapse
|
4
|
Schmitz R, Young RM, Ceribelli M, Jhavar S, Xiao W, Zhang M, Wright G, Shaffer AL, Hodson DJ, Buras E, Liu X, Powell J, Yang Y, Xu W, Zhao H, Kohlhammer H, Rosenwald A, Kluin P, Müller-Hermelink HK, Ott G, Gascoyne RD, Connors JM, Rimsza LM, Campo E, Jaffe ES, Delabie J, Smeland EB, Ogwang MD, Reynolds SJ, Fisher RI, Braziel RM, Tubbs RR, Cook JR, Weisenburger DD, Chan WC, Pittaluga S, Wilson W, Waldmann TA, Rowe M, Mbulaiteye SM, Rickinson AB, Staudt LM. Burkitt lymphoma pathogenesis and therapeutic targets from structural and functional genomics. Nature 2012; 490:116-20. [PMID: 22885699 DOI: 10.1038/nature11378] [Citation(s) in RCA: 633] [Impact Index Per Article: 52.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2012] [Accepted: 07/11/2012] [Indexed: 12/11/2022]
Abstract
Burkitt's lymphoma (BL) can often be cured by intensive chemotherapy, but the toxicity of such therapy precludes its use in the elderly and in patients with endemic BL in developing countries, necessitating new strategies. The normal germinal centre B cell is the presumed cell of origin for both BL and diffuse large B-cell lymphoma (DLBCL), yet gene expression analysis suggests that these malignancies may use different oncogenic pathways. BL is subdivided into a sporadic subtype that is diagnosed in developed countries, the Epstein-Barr-virus-associated endemic subtype, and an HIV-associated subtype, but it is unclear whether these subtypes use similar or divergent oncogenic mechanisms. Here we used high-throughput RNA sequencing and RNA interference screening to discover essential regulatory pathways in BL that cooperate with MYC, the defining oncogene of this cancer. In 70% of sporadic BL cases, mutations affecting the transcription factor TCF3 (E2A) or its negative regulator ID3 fostered TCF3 dependency. TCF3 activated the pro-survival phosphatidylinositol-3-OH kinase pathway in BL, in part by augmenting tonic B-cell receptor signalling. In 38% of sporadic BL cases, oncogenic CCND3 mutations produced highly stable cyclin D3 isoforms that drive cell cycle progression. These findings suggest opportunities to improve therapy for patients with BL.
Collapse
Affiliation(s)
- Roland Schmitz
- Metabolism Branch Center for Cancer Research, National Cancer Institute, NIH, Bethesda, Maryland 20892, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Sharma R, Buras E, Terashima T, Serrano F, Massaad CA, Hu L, Bitner B, Inoue T, Chan L, Pautler RG. Hyperglycemia induces oxidative stress and impairs axonal transport rates in mice. PLoS One 2010; 5:e13463. [PMID: 20976160 PMCID: PMC2956689 DOI: 10.1371/journal.pone.0013463] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2010] [Accepted: 09/14/2010] [Indexed: 11/19/2022] Open
Abstract
Background While hyperglycemia-induced oxidative stress damages peripheral neurons, technical limitations have, in part, prevented in vivo studies to determine the effect of hyperglycemia on the neurons in the central nervous system (CNS). While olfactory dysfunction is indicated in diabetes, the effect of hyperglycemia on olfactory receptor neurons (ORNs) remains unknown. In this study, we utilized manganese enhanced MRI (MEMRI) to assess the impact of hyperglycemia on axonal transport rates in ORNs. We hypothesize that (i) hyperglycemia induces oxidative stress and is associated with reduced axonal transport rates in the ORNs and (ii) hyperglycemia-induced oxidative stress activates the p38 MAPK pathway in association with phosphorylation of tau protein leading to the axonal transport deficits. Research Design and Methods T1-weighted MEMRI imaging was used to determine axonal transport rates post-streptozotocin injection in wildtype (WT) and superoxide dismutase 2 (SOD2) overexpressing C57Bl/6 mice. SOD2 overexpression reduces mitochondrial superoxide load. Dihydroethidium staining was used to quantify the reactive oxygen species (ROS), specifically, superoxide (SO). Protein and gene expression levels were determined using western blotting and Q-PCR analysis, respectively. Results STZ-treated WT mice exhibited significantly reduced axonal transport rates and significantly higher levels of ROS, phosphorylated p38 MAPK and tau protein as compared to the WT vehicle treated controls and STZ-treated SOD2 mice. The gene expression levels of p38 MAPK and tau remained unchanged. Conclusion Increased oxidative stress in STZ-treated WT hyperglycemic mice activates the p38 MAPK pathway in association with phosphorylation of tau and attenuates axonal transport rates in the olfactory system. In STZ-treated SOD-overexpressing hyperglycemic mice in which superoxide levels are reduced, these deficits are reversed.
Collapse
Affiliation(s)
- Ruchi Sharma
- Translational Biology and Molecular Medicine, Baylor College of Medicine, Houston, Texas, United States of America
| | - Eric Buras
- Department of Medicine, Baylor College of Medicine, Houston, Texas, United States of America
| | - Tomoya Terashima
- Department of Medicine, Baylor College of Medicine, Houston, Texas, United States of America
| | - Faridis Serrano
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Cynthia A. Massaad
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Lingyun Hu
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Brittany Bitner
- Translational Biology and Molecular Medicine, Baylor College of Medicine, Houston, Texas, United States of America
| | - Taeko Inoue
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Lawrence Chan
- Translational Biology and Molecular Medicine, Baylor College of Medicine, Houston, Texas, United States of America
- Department of Medicine, Baylor College of Medicine, Houston, Texas, United States of America
| | - Robia G. Pautler
- Translational Biology and Molecular Medicine, Baylor College of Medicine, Houston, Texas, United States of America
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, Texas, United States of America
- * E-mail:
| |
Collapse
|
6
|
Yechoor V, Liu V, Paul A, Lee J, Buras E, Ozer K, Samson S, Chan L. Gene therapy with neurogenin 3 and betacellulin reverses major metabolic problems in insulin-deficient diabetic mice. Endocrinology 2009; 150:4863-73. [PMID: 19819964 PMCID: PMC2775983 DOI: 10.1210/en.2009-0527] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Insulin deficiency in type 1 diabetes leads to disruptions in glucose, lipid, and ketone metabolism with resultant hyperglycemia, hyperlipidemia, and ketonemia. Exogenous insulin and hepatic insulin gene therapy cannot mimic the robust glucose-stimulated insulin secretion (GSIS) from native pancreatic islets. Gene therapy of streptozotocin-diabetic mice with neurogenin 3 (Ngn3) and betacellulin (Btc) leads to the induction of periportal oval cell-derived neo-islets that exhibit GSIS. We hence hypothesized that this gene therapy regimen may lead to a complete correction of the glucose and lipid metabolic abnormalities associated with insulin deficiency; we further hypothesized that the neo-islets formed in response to Ngn3-Btc gene delivery may display an ultrastructure and transcription profile similar to that of pancreatic islets. We injected streptozotocin-diabetic mice with helper-dependent adenoviral vectors carrying Ngn3 and Btc, which restored GSIS and reversed hyperglycemia in these animals. The treatment also normalized hepatic glucose secretion and reversed ketonemia. Furthermore, it restored hepatic glycogen content and reinstated hepatic lipogenesis-related gene transcripts back to nondiabetic levels. By transmission electron microscopy, the neo-islets displayed electron-dense granules that were similar in appearance to those in pancreatic islets. Finally, using RNA obtained by laser capture microdissection of the periportal neo-islets and normal pancreatic islets, we found that the neo-islets and pancreatic islets exhibited a very similar transcription profile on microarray-based transcriptome analysis. Taken together, this indicates that Ngn3-Btc gene therapy corrects the underlying dysregulated glucose and lipid metabolism in insulin-deficient diabetic mice by inducing neo-islets in the liver that are similar to pancreatic islets in structure and gene expression profile.
Collapse
Affiliation(s)
- Vijay Yechoor
- Division of Diabetes, Endocrinology, and Metabolism, Department of Medicine, Baylor College of Medicine, One Baylor Plaza, R614, Houston, Texas 77030, USA
| | | | | | | | | | | | | | | |
Collapse
|