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Leucyl-tRNA synthetase is a tumor suppressor in breast cancer and enables tumor suppressive translation

ABSTRACT: In this study, we identify leucyl-tRNA synthetase (LARS) as a breast tumor suppressor. To identify the mechanism underlying LARS-mediated breast tumor suppression, we conducted TMT-proteomics in PyMT mouse tumors with monoallelic genetic deletion of LARS in the mammary tumor compartment. The analyses implicate LARS as a regulator of leucine-rich protein translation resulting in downregulation of candidate leucine-rich tumor suppressor genes.

INSTRUMENT(S):

ORGANISM(S): Mus Musculus (mouse)

SUBMITTER: Soren Heissel

LAB HEAD: Sohail Tavazoie

PROVIDER: PXD026609 | Pride | 2022-01-10

REPOSITORIES: Pride

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			Action	DRS
	MS216677LUM_Maria_Tavazoie_Fraction_0.msf	Msf
	MS216677LUM_Maria_Tavazoie_Fraction_01.raw	Raw
	MS216677LUM_Maria_Tavazoie_Fraction_02.raw	Raw
	MS216677LUM_Maria_Tavazoie_Fraction_03.raw	Raw
	MS216677LUM_Maria_Tavazoie_Fraction_04.raw	Raw

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Charged tRNA profiling of mcf10a, HCC1806 cells, polysome profiling, RNA-Seq and Ribo-Seq in 4T07 cells upon LARS knockdown by shRNA, and RNA-Seq of ribosome-associated RNAs in Lars depleted PyMT tumors

Project description:In this study, we identify leucyl-tRNA synthetase (LARS) as a breast tumor suppressor. To identify the mechanism underlying LARS-mediated breast tumor suppression, we first conducted charged tRNA profiling to assess charged and total tRNA-Leu expression in cell lines with high and low LARS expression. Expression of select charged and total tRNA-Leu isoacceptors were reduced in cell lines with lower LARS expression. We then conducted RNA-Seq and translation profiling including ribosome profiling (Ribo-Seq), polysome profiling in LARS-depleted cell lines. To test our hypothesis in vivo, we also performed RNA-Seq of ribosome-associated RNAs in Lars depleted PyMT tumors within RiboTag mice. The analyses implicate LARS as a regulator of leucine-rich translation.

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Project description:Cancer immunotherapies boost antitumor immunity and improve the survival of cancer patients. V-domain Immunoglobulin Suppressor of T cell Activation (VISTA) is an immune 20 checkpoint target but presents elusive signaling mechanisms. We report a novel VISTA binding partner, Leucine-Rich Repeats and Immunoglobulin Like Domains 1 (LRIG1), which acts as an inhibitory receptor by engaging VISTA and suppressing T cell receptor signaling pathways. Mice with T cell-specific LRIG1 deletion developed superior antitumor T cell responses. Mechanistically, LRIG1-deficient tumor-specific CD8+ cytotoxic T cells (CTLs) exhibited longer 25 persistence due to improved expansion and survival and greater effector function. Sustained tumor control was also associated with a reduction of quiescent CTLs (TCF1+ CD62Lhi PD-1low) and a reciprocal increase in progenitor and memory-like CTLs (TCF1+ PD-1+). In human melanoma, an elevated LRIG1 expression on tumor-infiltrating CD8+ CTLs correlated with resistance to immunotherapies. Taken together, these results delineate the role of LRIG1 as an inhibitory 30 immune checkpoint receptor and propose a rationale for targeting the VISTA/LRIG1 axis for cancer immunotherapy.

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Tumor Suppressor Role for the c-Myb Oncogene in Luminal Breast Cancer

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