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10399 DNA-PK(cs) Regulates Stability of Egr1 During T Cell Activation
- Zachary Waldrip, David Harrison, Marie Burdine, Lyle Burdine
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- Journal:
- Journal of Clinical and Translational Science / Volume 5 / Issue s1 / March 2021
- Published online by Cambridge University Press:
- 30 March 2021, p. 7
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ABSTRACT IMPACT: This work provides supporting evidence for the development of a novel immunosuppression therapy for transplant patients. OBJECTIVES/GOALS: Our laboratory reported that inhibition of the kinase DNA-PK(cs) in mice delays allogeneic graft rejection in part by mitigating the induction of certain cytokines. We hypothesized that this was due to an inhibition of intracellular signaling programs in T cells and designed studies to identify the mechanism(s) by which this occurs. METHODS/STUDY POPULATION: The immortalized Jurkat T cell line was used to evaluate the effect of the DNA-PK(cs) inhibitor NU7441 on T cell activation by PMA/Ionomycin or PMA/PHA. Mouse primary splenocytes also were used to demonstrate the universality and reproducibility of our observations. Initially, protein mass spectrometry of lysates from untreated and NU7441-treated Jurkat cells identified proteins of interest regulated by DNA-PK(cs) that play a role in T cell activation and cytokine production. CRISPR genome editing was used to validate a potential downstream target of DNA-PK(cs). Western blot, ELISA, and flow cytometry were used to document changes in protein levels with respect to treatments. RESULTS/ANTICIPATED RESULTS: We observed that expression of the transcription factor Egr1 was highly induced after activation but attenuated after treatment with NU7441 in both Jurkat T cells and mouse splenocytes. Phosphorylated serine 301 of Egr1 was identified by mass spectrometry in stimulated cells and fits the kinase consensus sequence for DNA-PK(cs). Both an endogenous CRISPR-generated serine 301 to alanine mutant and expression of a plasmid-based S301A mutant resulted in an unstable form of Egr1 that was barely detectable. In contrast, expression of either a S301 to D or E phospho-mimetic mutant resulted in a stable form of the protein detectable by Western blot. Further evaluation of these mutants and Egr1 phosphorylation is underway to determine the mechanism by which DNA-PK(cs) kinase regulates protein stability. DISCUSSION/SIGNIFICANCE OF FINDINGS: We previously reported a role for DNA-PK(cs) in immunomodulation. We now have evidence that this occurs in part through stabilization of Egr1. We believe this novel finding will lead to uncovering a broader role for DNA-PK(cs) as a mediator of protein stability in T cells and provide support for targeting DNA-PK(cs) in immunosuppression therapy.
PP506 Health Technology Reassessment (HTR) Of A Non-Drug Technology: Methods Used By A Regional HTA Unit
- Marie-Belle Poirier, Maria Benkhalti, Jérémy Joncas, Ouifak El Warrari, Aghiles Addad, Sonia Cheng, Frédéric Mior, Anne Méziat-Burdin, Pierre Dagenais
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- Journal:
- International Journal of Technology Assessment in Health Care / Volume 36 / Issue S1 / December 2020
- Published online by Cambridge University Press:
- 28 December 2020, p. 40
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Introduction
An environmental scan conducted by the Canadian Agency for Drugs and Technologies (CADTH-March-2019) revealed that several health technology assessment (HTA) organisations are currently developing standard health technology reassessment (HTR) processes. Here we present methods used to conduct an HTR of a prioritization programme for non-immediate life-threatening urgent surgeries implemented in 2017 at a tertiary referral hospital in (Quebec-Canada). This HTR initiative was conducted by a regional HTA unit to optimize the programme efficiency and resources utilization as well as to motivate change in the clinical community of other hospitals within its healthcare network. Patient and healthcare personnel satisfaction levels towards the programme were also considered.
MethodsIn this case study, HTR methods and outputs were elaborated using elements presented in the CADTH environmental scan and relevant publications identified through PubMed and in the grey literature. Documents in English and French, published between January 2002 and March 2019 were considered. Key stakeholders were consulted to identify barriers of the programme implementation to other hospitals in regards to aspects related either to the local medical practice or organizational factors.
ResultsThe prioritization process was conducted using the same tool applied for HTA appraisal with the additional criterion that the HTR could facilitate the programme implementation. The research processes used in this HTR included: i) systematic review of the literature, ii) hospital database search (efficacy and resource utilization), iii) perceptions of healthcare teams and patients. HTR outputs consist of specific recommendations on implementation barriers and methods to monitor the impacts of the programme.
ConclusionsIn this evolving field, sharing lessons from HTR methods provides information to develop standard adaptable processes to different contexts. Hence, this work applies HTR to a healthcare programme while most of the literature focuses on the HTR processes on drug and interventional medicine disinvestment. These elements represented HTR methods used from prioritization appraisal, research processes for evaluation and outputs used to plan the implementation and finally monitoring from a regional HTA unit. It also showcases that HTR being conducted as a structured evidence-based assessment adds value to a healthcare programme and could also facilitate its implementation.
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