Griffith Faculty Profile

Contact

Location: 5.016V.6 - MED

Department

Microbiology, Immunology & Molecular Genetics

Griffith, Ann V., Ph.D.

Assistant Professor

Personal Statement:

 

Ann’s laboratory website can be found here.

Research in Dr. Ann Griffith’s laboratory focuses on the lymphopoietic stromal microenvironment in the thymus. T lymphocytes are critical mediators of immunity generated in the thymus through mutually inductive “cross-talk” with thymic stromal cells. Age-induced alterations in stromal cells cause substantial thymic atrophy and dysfunction, resulting in diminished T cell production and concomitant immunodeficiencies, including decreased responsiveness to infection and vaccination. Preserving thymus function therefore holds significant potential to extend the healthspan. However, mechanisms driving age-induced stromal dysfunction have been difficult to resolve because thymic stromal cells are rare and difficult to isolate. Her lab applies a novel computational deconvolution approach to spatially map stromal gene expression using microdissected whole tissue, eliminating the need for stromal cell isolation. Long-term goals of the lab include revealing novel lymphopoietic stromal functions in the young, steady state thymus, and boosting thymus function during aging.


Education

Ph.D., University of Texas Health Science Center at Houston-M.D. Anderson Cancer Center, 2006

Research

Ann’s laboratory website can be found here.

Dr. Griffith’s research interests lie in the identification of lymphopoietic signals provided by the stromal microenvironment in the thymus, the biology of thymic stromal cells, and the mechanisms and consequences (including diminished vaccine response and increased susceptibility to infection) of age-induced thymic atrophy. The impact of age-induced atrophy on T cell production, which is pronounced by young adulthood, is not limited to the elderly, but is also apparent in young adults when lymphopenia is actively induced, such as in patients receiving myeloablative therapy and bone marrow stem cell transplants. The primary targets of age-induced atrophy are a relatively rare stromal population. Unfortunately this population is difficult to isolate for a number of reasons, and the mechanisms governing thymic atrophy have remained relatively obscure. Over the last several years they have devised and implemented a novel computational deconvolution approach to globally and spatially map gene expression in thymic stromal cells, revealing exciting new aspects of thymus biology. Ongoing projects in the lab aim to identify the causes and consequences of age-associated thymic stromal dysfunction. Their ultimate goal is to develop novel approaches to extend the health span during aging.

Awards & Accomplishments

R21 AI166843      Griffith/Zhang/Xiang (MPI)      06/01/22-05/31/24      NIH

THE IMPACT OF AGING AND THYMUS REGENERATION ON TISSUE-RESIDENT CD8 T CELL RESPONSES TO VIRAL INFECTION AND VACCINATION

In this study we will test the hypothesis that thymus regeneration by growth hormone administration promotes T cell responses to vaccination and viral infection by improving tissue-resident T cell function in aged murine lung.     Role: Contact MPI

R56 AI153626        Griffith (PI)           07/01/21-06/30/22     NIH.     (NCE to 6/30/23)

CAUSES AND CONSEQUENCES OF DECLINING B CELL-MEDIATED CENTRAL T CELL TOLERANCE THROUGHOUT THE LIFESPAN

In this study we will test the hypothesis that declining thymic B cell expression of self-antigens impairs T cell tolerance and promotes autoimmunity.     Role: PI

R21 AI154109      Griffith (PI)              02/15/21-01/31/23        NIH

THE ROLE OF PARACRINE MTOR SIGNALING IN REGULATING THYMUS SIZE AND FUNCTION

In this study we will test the hypothesis that paracrine mTOR signaling maintains thymus size using tissue-specific transgenic mice overexpressing mTOR activating ligands in medullary thymic epithelial cells (mTEC).      Role: PI

YearAward
2022Fall STAR Educator
https://lsom.uthscsa.edu/aes/2023-star-educators-recipients/2023-star-educator-recipient-ann-griffith-phd-mimg/
2021Graduate School of Biomedical Science Mentor of the Year
2018Howard Hughes Medical Institute Gilliam Fellowship
Mentor
https://lsom.uthscsa.edu/mimg/2018/08/15/sergio-cepeda-and-dr-ann-griffith-awarded-gilliam-fellowships-for-advanced-study
2018Editorial Board: Aging Cell
2017Max and Minnie Tomerlin Voelcker Fund Young Investigator Award
2016Faculty of the Year, UT Health San Antonio Department of Microbiology, Immunology & Molecular Genetics
2015American Association of Immunologists Early Career Travel Award
2015Greehey President’s Fund for Faculty Excellence Award
2014 American Association of Immunologists Travel for Techniques Award

Affiliations

American Association of Immunologists

Lab Members


Lab lunch summer 2018Allison won the 2018 Heather Menzie Junior Student Award!Sergio won GSBS Senior Student 2018!Andrew presenting his 2018 summer project
PictureName
Yangming Xiao Ph.D. M.D
Lab Manager
XiaoY@livemail.uthscsa.edu
Sarah Wedemeyer
M.D./Ph.D. Student
wedemeyers@livemail.uthscsa.edu
Aaron Garza
M.S. Student
garzaa43@livemail.uthscsa.edu
Kahealani Archuleta
M.S. Student
archuletak@livemail.uthscsa.edu

Griffith Lab Alumni

  • Nicholas Jones (M.S.)
  • Carolina Cantu (M.S.)
  • Stephanie Orozco (M.S.)
  • Abdulaziz Almutairi (M.S.)
  • Martin Sandoval (M.S.)
  • Stephanny Lizarraga (M.S.)
  • Chioma Udeaja (M.S.)
  • Kymberly Wimberly (M.S.)
  • Allison Hester (Ph.D.)
  • Sergio Cepeda (Ph.D.)
  • Manpreet Semwal (Ph.D.)

News

  • Congratulations to Aaron for earning the American Legion Post 336 Scholarship for Veterans 2023!
  • Congratulations to Kahealani for earning the UTHSCSA Bennie W. Schreck Scholarship 2023!
  • Congratulations to Sarah for winning 2nd place at the South Texas MSTP Spring Retreat Poster Session!
  • Congratulations to Sarah for earning an AAI Travel Award and podium presentation spot for Immunology 2023!
  • 6/2/21 – Happy Graduation to Allison, Sergio, and Manpreet! They are headed to postdocs at Stanford, UTSW, and Barshop Institute!
  • 3/31/21- Congratulations to Manpreet for winning the GSBS 2021 Student Award for Outstanding Student Leadership!
  • 2/3/20- Sergio and Manpreet were selected to give podium presentations at AAI 2020 and received AAI Travel Awards!
  • 7/26/18 Congratulations, Sergio! A 2018 Howard Hughes Medical Institute Gilliam Fellow!

https://www.hhmi.org/news/45-gilliam-fellowships-support-students-and-advisers-committed-to-increasing-diversity-science

Publications

Complete List of Publications

Semwal, M.K., Hester, A,K., Xiao, Y., Udeaja, C., Cepeda, S., Verschelde, J.S., Jones, N., Wedemeryer, S.A., Emtage, S., Wimberly, K., Griffith, A.V. 2022 Redox status regulates autophagy in thymic stromal cells and promotes T cell tolerance. PNAS 119 (40) e2204296119. doi.org/10.1073/pnas.2204296119 PMCID: PMC9549397.https://www.pnas.org/doi/full/10.1073/pnas.2204296119

Hester AK, Semwal MK, Cepeda S, Xiao Y, Rueda M, Wimberly K, Venables T, Dileepan T, Kraig E, Griffith AVRedox regulation of age-associated defects in generation and maintenance of T cell self-tolerance and immunity to foreign antigens. Cell Rep. 2022 Feb 15;38(7):110363. doi: 10.1016/j.celrep.2022.110363. PubMed PMID: 35172147; PubMed Central PMCID: PMC8898380.

Semwal MK, Jones NE, Griffith AVMetabolic Regulation of Thymic Epithelial Cell Function. Front Immunol. 2021;12:636072. doi: 10.3389/fimmu.2021.636072. eCollection 2021. Review. PubMed PMID: 33746975; PubMed Central PMCID: PMC7968369.

Venables T, Griffith AV, DeAraujo A, Petrie HT. Dynamic changes in epithelial cell morphology control thymic organ size during atrophy and regeneration. Nat Commun. 2019 Sep 27;10(1):4402. doi: 10.1038/s41467-019-11879-2. PubMed PMID: 31562306; PubMed Central PMCID: PMC6765001.

Cepeda S, Griffith AVThymic stromal cells: Roles in atrophy and age-associated dysfunction of the thymus. Exp Gerontol. 2018 May;105:113-117. doi: 10.1016/j.exger.2017.12.022. Epub 2017 Dec 24. Review. PubMed PMID: 29278750; PubMed Central PMCID: PMC5869099.

Cepeda S, Cantu C, Orozco S, Xiao Y, Brown Z, Semwal MK, Venables T, Anderson MS, GriffithAVAge-Associated Decline in Thymic B Cell Expression of Aire and Aire-Dependent Self-Antigens. Cell Rep. 2018 Jan 30;22(5):1276-1287. doi: 10.1016/j.celrep.2018.01.015. PubMed PMID: 29386114; PubMed Central PMCID: PMC5813500.

Griffith A.V., Venables T, Shi J, Farr A, Van Remmen H, Szweda L, Fallahi M, Rabinovitch P, Petri H. 2015 Metabolic damage and premature thymus aging caused by stromal catalase deficiency. Cell Reports. Aug 18; 12 (7):1071-1079.

Bryson JL, Griffith A.V., Hughes B, Saito F, Takahama Y, Richie ER, Manley NR. 2013 Cell-Autonomous Defects in Thymic Epithelial Cells Disrupt Endothelial – Perivascular Cell Interactions in the Mouse ThymusPLoS ONE 8(6), e65196

Griffith A.V., Fallahi M, Venables T, Petrie HT. 2012 Persistent degenerative changes in thymic organ function revealed by an inducible model of organ regrowth. Aging Cell Feb; 11 (1): 169-77.

Griffith A.V., Fallahi M, Nakase H, Gosink M, Young B, Petrie HT.  2009 Spatial mapping of thymic stromal microenvironments reveals unique features influencing T lymphoid differentiation. Immunity Dec 18; 31(6):999-1009.

Griffith A.V., Cardenas K, Carter C, Gordon J, Iberg A, Engleka K, Epstein JA, Manley NR, Richie ER. 2009 Increased thymus- and decreased parathyroid-fated organ domains in Splotch mutant embryos. Dev Biol. Mar 1;327(1):216-27.

Benavides F, Gomez G, Venables-Griffith A, Lambertz I, Flores M, Angel JM, Fuchs-Young R, Richie ER, Conti CJ. 2006 Differential susceptibility to chemically-induced thymic lymphomas in SENCARB and SSIN inbred mice. Mol Carcinog. Jul;45(7):543:8.

Benavides F*, Venables A*, Poetschke Klug H, Glasscock E, Rudensky A, Gomez M, Palenzuela N, Guenet J, Richie E, Conti C.  2001 The CD4 T cell-deficient mouse mutation nackt (nkt) involves a deletion in the cathepsin L (Ctsl) gene. Immunogenetics. Apr;53(3):233-242.*These authors contributed equally to this work.