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aTyr Pharma Presents Compelling Preclinical Data Highlighting Potential of ATYR1923 to Regulate Myeloid Cell Biology During Lung Inflammation

Poster presentation at the Keystone Symposia 2019 Conference: Myeloid Cells (B7)

SAN DIEGO, Feb. 27, 2019 (GLOBE NEWSWIRE) -- aTyr Pharma, Inc. (LIFE), a biotherapeutics company engaged in the discovery and development of innovative medicines based on novel immunological pathways, today announced a poster presentation at the Keystone Symposia 2019 Conference in Santa Fe, New Mexico from February 24-28, 2019.

“We are pleased to present these important preclinical findings at Keystone Symposia 2019, the first evidence of ATYR1923’s ability to bind to NRP-2 and down-regulate myeloid cells, specifically neutrophils,” said Dr. Sanjay Shukla, President and Chief Executive Officer of aTyr. “With ATYR1923 currently being evaluated in a Phase 1b/2a clinical study in patients suffering from pulmonary sarcoidosis, these findings help support our belief in the mechanism of action of ATYR1923 to suppress immune engagement in this and other serious and potentially debilitating interstitial lung diseases.”    

Poster Presentation:  Wednesday, February 27, 2019 from 1:30-3:00pm (MST)
Title: ATYR1923 Reduces Neutrophil Infiltration in an Acute Lipopolysaccharide (LPS) Lung Injury Model
Presenter: Suzanne Paz, Ph.D., aTyr Pharma, Inc.

This poster describes a preclinical study to determine if aTyr Pharma’s lead clinical candidate, ATYR1923, can influence myeloid cell migration. ATYR1923 was administered intravenously to C57BL/6 mice 24 hours prior to LPS challenge by airway administration to generate acute lung inflammation.

Multi-color flow cytometry was used for immunophenotyping analysis and detection of NRP-2 levels on surfaces of various immune cell populations. In vitro, mouse bone-marrow derived macrophages (BMDM), human THP-1 monocytic cells, and primary human dendritic cells (DCs) were used to confirm induction of NRP-2 cell surface expression following activation.

Conclusions:

  • This presentation highlights how ATYR1923 binds to both human and mouse NRP-2.
  • NRP-2 is detected on the cell surface of myeloid cells both in vitro and in vivo.
  • NRP-2 was induced following activation of TLR found on the cell surface (mainly TLR1, 2, 4, 5 & 6), but not endosomal TLR ligands (TLR3, 7/8, & 9).
  • ATYR1923 significantly decreased the CD11b+ population following LPS installation in the lung, which was ascribed to an inhibitory effect on neutrophil infiltration.
  • These findings highlight the potential of ATYR1923 to regulate myeloid cell biology during lung inflammation.

A copy of the poster can be found here: ATYR1923 Poster

About aTyr

aTyr is a biotherapeutics company engaged in the discovery and development of innovative medicines based on novel immunological pathways. aTyr’s research and development efforts are concentrated on a newly discovered area of biology, the extracellular functionality of tRNA synthetases. aTyr has built a global intellectual property estate directed to a potential pipeline of protein compositions derived from 20 tRNA synthetase genes. aTyr is focused on the therapeutic translation of the Resokine pathway, comprised of extracellular proteins derived from the histidyl tRNA synthetase gene family. ATYR1923 is a clinical-stage product candidate which binds to the neuropilin-2 receptor and is designed to down-regulate immune engagement in interstitial lung diseases and other immune-mediated diseases. For more information, please visit http://www.atyrpharma.com.

Forward-Looking Statements

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Contact:
Joyce Allaire
Managing Director, LifeSci Advisors, LLC
jallaire@lifesciadvisors.com