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Sedney CJ, Caulfield A, Dewan KK, Blas-Machado U, Callender M, Manley NR, Harvill ET. Novel murine model reveals an early role for pertussis toxin in disrupting neonatal immunity to Bordetella pertussis. Front Immunol 2023; 14:1125794. [PMID: 36855631 PMCID: PMC9968397 DOI: 10.3389/fimmu.2023.1125794] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 01/26/2023] [Indexed: 02/10/2023] Open
Abstract
The increased susceptibility of neonates to specific pathogens has previously been attributed to an underdeveloped immune system. More recent data suggest neonates have effective protection against most pathogens but are particularly susceptible to those that target immune functions specific to neonates. Bordetella pertussis (Bp), the causative agent of "whooping cough", causes more serious disease in infants attributed to its production of pertussis toxin (PTx), although the neonate-specific immune functions it targets remain unknown. Problematically, the rapid development of adult immunity in mice has confounded our ability to study interactions of the neonatal immune system and its components, such as virtual memory T cells which are prominent prior to the maturation of the thymus. Here, we examine the rapid change in susceptibility of young mice and define a period from five- to eight-days-old during which mice are much more susceptible to Bp than mice even a couple days older. These more narrowly defined "neonatal" mice display significantly increased susceptibility to wild type Bp but very rapidly and effectively respond to and control Bp lacking PTx, more rapidly even than adult mice. Thus, PTx efficiently blocks some very effective form(s) of neonatal protective immunity, potentially providing a tool to better understand the neonatal immune system. The rapid clearance of the PTx mutant correlates with the early accumulation of neutrophils and T cells and suggests a role for PTx in disrupting their accumulation. These results demonstrate a striking age-dependent response to Bp, define an early age of extreme susceptibility to Bp, and demonstrate that the neonatal response can be more efficient than the adult response in eliminating bacteria from the lungs, but these neonatal functions are substantially blocked by PTx. This refined definition of "neonatal" mice may be useful in the study of other pathogens that primarily infect neonates, and PTx may prove a particularly valuable tool for probing the poorly understood neonatal immune system.
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Affiliation(s)
- Colleen J. Sedney
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Amanda Caulfield
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Kaylan K. Dewan
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Uriel Blas-Machado
- Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Maiya Callender
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Nancy R. Manley
- Department of Genetics, Franklin College of Arts and Sciences, University of Georgia, Athens, GA, United States
| | - Eric T. Harvill
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
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Funk CR, Wang S, Chen KZ, Waller A, Sharma A, Edgar CL, Gupta VA, Chandrakasan S, Zoine JT, Fedanov A, Raikar SS, Koff JL, Flowers CR, Coma S, Pachter JA, Ravindranathan S, Spencer HT, Shanmugam M, Waller EK. PI3Kδ/γ inhibition promotes human CART cell epigenetic and metabolic reprogramming to enhance antitumor cytotoxicity. Blood 2022; 139:523-537. [PMID: 35084470 PMCID: PMC8796652 DOI: 10.1182/blood.2021011597] [Citation(s) in RCA: 65] [Impact Index Per Article: 32.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Accepted: 08/25/2021] [Indexed: 12/11/2022] Open
Abstract
Current limitations in using chimeric antigen receptor T(CART) cells to treat patients with hematological cancers include limited expansion and persistence in vivo that contribute to cancer relapse. Patients with chronic lymphocytic leukemia (CLL) have terminally differentiated T cells with an exhausted phenotype and experience low complete response rates after autologous CART therapy. Because PI3K inhibitor therapy is associated with the development of T-cell-mediated autoimmunity, we studied the effects of inhibiting the PI3Kδ and PI3Kγ isoforms during the manufacture of CART cells prepared from patients with CLL. Dual PI3Kδ/γ inhibition normalized CD4/CD8 ratios and maximized the number of CD8+ T-stem cell memory, naive, and central memory T-cells with dose-dependent decreases in expression of the TIM-3 exhaustion marker. CART cells manufactured with duvelisib (Duv-CART cells) showed significantly increased in vitro cytotoxicity against CD19+ CLL targets caused by increased frequencies of CD8+ CART cells. Duv-CART cells had increased expression of the mitochondrial fusion protein MFN2, with an associated increase in the relative content of mitochondria. Duv-CART cells exhibited increased SIRT1 and TCF1/7 expression, which correlated with epigenetic reprograming of Duv-CART cells toward stem-like properties. After transfer to NOG mice engrafted with a human CLL cell line, Duv-CART cells expressing either a CD28 or 41BB costimulatory domain demonstrated significantly increased in vivo expansion of CD8+ CART cells, faster elimination of CLL, and longer persistence. Duv-CART cells significantly enhanced survival of CLL-bearing mice compared with conventionally manufactured CART cells. In summary, exposure of CART to a PI3Kδ/γ inhibitor during manufacturing enriched the CART product for CD8+ CART cells with stem-like qualities and enhanced efficacy in eliminating CLL in vivo.
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Affiliation(s)
- Christopher Ronald Funk
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA
| | - Shuhua Wang
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA
| | - Kevin Z Chen
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA
| | - Alexandra Waller
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA
| | - Aditi Sharma
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA
| | - Claudia L Edgar
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA
| | - Vikas A Gupta
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA
| | | | - Jaquelyn T Zoine
- Cell and Gene Therapy Program, Aflac Cancer and Blood Disorders Center, Department of Pediatrics, Children's Healthcare of Atlanta and Emory University School of Medicine, Atlanta, GA
| | - Andrew Fedanov
- Cell and Gene Therapy Program, Aflac Cancer and Blood Disorders Center, Department of Pediatrics, Children's Healthcare of Atlanta and Emory University School of Medicine, Atlanta, GA
| | - Sunil S Raikar
- Cell and Gene Therapy Program, Aflac Cancer and Blood Disorders Center, Department of Pediatrics, Children's Healthcare of Atlanta and Emory University School of Medicine, Atlanta, GA
| | - Jean L Koff
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA
| | - Christopher R Flowers
- Cell and Gene Therapy Program, Aflac Cancer and Blood Disorders Center, Department of Pediatrics, Children's Healthcare of Atlanta and Emory University School of Medicine, Atlanta, GA
- Department of Lymphoma/Myeloma, Division of Cancer Medicine, University of Texas MD Anderson Cancer Center, Houston, TX; and
| | | | | | - Sruthi Ravindranathan
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA
| | - H Trent Spencer
- Cell and Gene Therapy Program, Aflac Cancer and Blood Disorders Center, Department of Pediatrics, Children's Healthcare of Atlanta and Emory University School of Medicine, Atlanta, GA
| | - Mala Shanmugam
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA
| | - Edmund K Waller
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA
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