Dataset Information

Transdermal bicarbonate therapy increass intra-tumoral pH and elicits amti-tumor responses in bladder cancer

ABSTRACT: Introduction: Tumor acidosis is a hallmark of cancer that leads to abrogation of T cell function and cancer progression. Oral sodium bicarbonate therapy for alkalization of the extracellular tumor pH has shown moderate positive effects in tumor models. However, its applicability in the clinic is very limited due to the unreasonably high dosage required and gastrointestinal disturbances that arise. In this study, we assessed the functional effects of acidity on T cells. Methods: We show that acidity alters T cell proliferation, migration and effector functions as well as transcriptional programming using in vitro culture techniques and RNA sequencing. We then tested the potency of a proprietary transdermal formulation, DYV800, containing sodium bicarbonate to increase the extracellular tumor pH (pHe) and augment anti-tumor immune responses in a murine model of bladder cancer. The tumor pH was assessed using Chemical Exchange Saturation Transfer Magnetic Resonance Imaging (CEST-MRI) and antitumor immune responses via flow cytometry. Results: We found that transdermal DYV800 significantly reduced tumor burden and improved antigen-specific CD8+ T cell responses. Chemical Exchange Saturation Transfer Magnetic Resonance Imaging (CEST-MRI) of treated tumors showed an increase in intra-tumoral pH of bladder tumors, and this therapy also alkalizes the urine. Discussion/Conclusion: The transdermal delivery of DYV800 led to durable anti-tumor immune responses and is more clinically applicable to combat acidity in bladder cancer than oral bicarbonate. Targeting acidosis in the bladder tumor microenvironment has the potential to enhance T cell responses and improve anti-tumor immunity.

ORGANISM(S): Mus musculus

PROVIDER: GSE322794 | GEO | 2026/03/06

REPOSITORIES: GEO

ACCESS DATA

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Project description:Lactic acidosis and hypoxia are two prominent tumor microenvironmental stresses that are both known to exert important influences on gene expression and phenotypes of cancer cells. But very little is known about the cross-talk and interaction between these two stresses. We performed gene expression analysis of MCF7 cells exposed to lactic acidosis, hypoxia and combined lactic acidosis and hypoxia. We found the hypoxia response elicited under hypoxia was mostly abolished upon simultaneous exposure to lactic acidosis. The repression effects are due to loss of HIF-1Î± protein synthesis under lactic acidosis. In addition, we showed lactic acidosis strongly synergizes with hypoxia to activate the unfold protein response (UPR) and inflammation response which are highly similar to amino acid deprivation responses (AAR). The statistical factor analysis of hypoxia and lactic acidosis responses indicated that ATF4 locus, an important activator in the UPR/AAR pathway, is amplified in subsets of breast tumors and cancer cell lines. Varying ATF4 levels dramatically affect the ability to survive the post-stress recovery from hypoxia and lactic acidosis and may suggest its selection of ATF4 amplification in human cancers. These data suggest that lactic acidosis interacts with hypoxia by both inhibiting the canonical hypoxia response and while activating the UPR and inflammation response. Gain of ATF4 locus may offer survival advantages to allow successful adaptation to frequent fluctuations of oxygen and acidity in tumor microenvironment. Collectively, our studies have provided linkage between the short-term transcriptional responses to the long term selection of the DNA copy number alterations (CNAs) under tumor microenvironmental stresses. RNAs from MCF7 cells exposed to control condition (ambient air ~21% O2, no lactate and neutral pH), lactic acidosis (ambient air, 10 mM Lactate and pH 6.7), hypoxia (1% pO2, no lactate and neutral pH) and the combined lactic acidosis and hypoxia (1% pO2, 10 mM Lactate and pH 6.7) condition for 24 hours were extracted by miRVana kits (Ambion) and hybridized to Affymetrix Human genome 133A 2.0 arrays with standard protocol.

Dataset Information

Transdermal bicarbonate therapy increass intra-tumoral pH and elicits amti-tumor responses in bladder cancer

Dataset's files

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets