更新于：2024-09-05

GPR68

更新于：2024-09-05

基本信息

别名

G protein-coupled receptor 68、G-protein coupled receptor 68、GPR12A

+ [5]

简介

Proton-sensing receptor involved in pH homeostasis. May represents an osteoblastic pH sensor regulating cell-mediated responses to acidosis in bone. Mediates its action by association with G proteins that stimulates inositol phosphate (IP) production or Ca(2+) mobilization. The receptor is almost silent at pH 7.8 but fully activated at pH 6.8. Also functions as a metastasis suppressor gene in prostate cancer (By similarity).

关联

100 项与 GPR68 相关的临床结果

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100 项与 GPR68 相关的转化医学

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0 项与 GPR68 相关的专利（医药）

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367

项与 GPR68 相关的文献（医药）

2024-02-22·Translational research : the journal of laboratory and clinical medicine

Inhibition of G protein-coupled receptor 68 using homoharringtonine attenuates chronic kidney disease-associated cardiac impairment.

Article

作者: Yuya Yoshida ; Kohei Fukuoka ; Miyu Sakugawa ; Masayuki Kurogi ; Kengo Hamamura ; Keika Hamasaki ; Fumiaki Tsurusaki ; Kurumi Sotono ; Takumi Nishi ; Taiki Fukuda ; Taisei Kumamoto ; Kosuke Oyama ; Takashi Ogino ; Akito Tsuruta ; Kouta Mayanagi ; Tomohiro Yamashita ; Hiroyuki Fuchino ; Nobuo Kawahara ; Kayo Yoshimatsu ; Hitomi Kawakami ; Satoru Koyanagi ; Naoya Matsunaga ; Shigehiro Ohdo

Chronic kidney disease (CKD) induces cardiac inflammation and fibrosis and reduces survival. We previously demonstrated that G protein-coupled receptor 68 (GPR68) promotes cardiac inflammation and fibrosis in mice with 5/6 nephrectomy (5/6Nx) and patients with CKD. However, no method of GPR68 inhibition has been found that has potential for therapeutic application. Here, we report that Cephalotaxus harringtonia var. nana extract and homoharringtonine ameliorate cardiac inflammation and fibrosis under CKD by suppressing GPR68 function. Reagents that inhibit the function of GPR68 were explored by high-throughput screening using a medicinal plant extract library (8,008 species), and we identified an extract from Cephalotaxus harringtonia var. nana as a GPR68 inhibitor that suppresses inflammatory cytokine production in a GPR68 expression-dependent manner. Consumption of the extract inhibited inflammatory cytokine expression and cardiac fibrosis and improved the decreased survival attributable to 5/6Nx. Additionally, homoharringtonine, a cephalotaxane compound characteristic of C. harringtonia, inhibited inflammatory cytokine production. Homoharringtonine administration in drinking water alleviated cardiac fibrosis and improved heart failure and survival in 5/6Nx mice. A previously unknown effect of C. harringtonia extract and homoharringtonine was revealed in which GPR68-dependent inflammation and cardiac dysfunction were suppressed. Utilizing these compounds could represent a new strategy for treating GPR68-associated diseases, including CKD.

2024-02-12·BMC medical genomics

RNA sequencing reveals differential long noncoding RNA expression profiles in bacterial and viral meningitis in children.

Article

作者: Xin Li ; Suzhen Sun ; Huifeng Zhang

BACKGROUND:

We aimed to investigate the involvement of long non-coding RNA (lncRNA) in bacterial and viral meningitis in children.

METHODS:

The peripheral blood of five bacterial meningitis patients, five viral meningitis samples, and five healthy individuals were collected for RNA sequencing. Then, the differentially expressed lncRNA and mRNA were detected in bacterial meningitis vs. controls, viral meningitis vs. healthy samples, and bacterial vs. viral meningitis patients. Besides, co-expression and the competing endogenous RNA (ceRNA) networks were constructed. Receiver operating characteristic curve (ROC) analysis was performed.

RESULTS:

Compared with the control group, 2 lncRNAs and 32 mRNAs were identified in bacterial meningitis patients, and 115 lncRNAs and 54 mRNAs were detected in viral meningitis. Compared with bacterial meningitis, 165 lncRNAs and 765 mRNAs were identified in viral meningitis. 2 lncRNAs and 31 mRNAs were specific to bacterial meningitis, and 115 lncRNAs and 53 mRNAs were specific to viral meningitis. The function enrichment results indicated that these mRNAs were involved in innate immune response, inflammatory response, and immune system process. A total of 8 and 1401 co-expression relationships were respectively found in bacterial and viral meningitis groups. The ceRNA networks contained 1 lncRNA-mRNA pair and 4 miRNA-mRNA pairs in viral meningitis group. GPR68 and KIF5C, identified in bacterial meningitis co-expression analysis, had an area under the curve (AUC) of 1.00, while the AUC of OR52K2 and CCR5 is 0.883 and 0.698, respectively.

CONCLUSIONS:

Our research is the first to profile the lncRNAs in bacterial and viral meningitis in children and may provide new insight into understanding meningitis regulatory mechanisms.

2024-01-31·Experimental hematology & oncology

GPR68-ATF4 signaling is a novel prosurvival pathway in glioblastoma activated by acidic extracellular microenvironment.

Article

作者: Charles H Williams ; Leif R Neitzel ; Jessica Cornell ; Samantha Rea ; Ian Mills ; Maya S Silver ; Jovanni D Ahmad ; Konstantin G Birukov ; Anna Birukova ; Henry Brem ; Betty Tyler ; Eli E Bar ; Charles C Hong

BACKGROUND:

Glioblastoma multiforme (GBM) stands as a formidable challenge in oncology because of its aggressive nature and severely limited treatment options. Despite decades of research, the survival rates for GBM remain effectively stagnant. A defining hallmark of GBM is a highly acidic tumor microenvironment, which is thought to activate pro-tumorigenic pathways. This acidification is the result of altered tumor metabolism favoring aerobic glycolysis, a phenomenon known as the Warburg effect. Low extracellular pH confers radioresistant tumors to glial cells. Notably GPR68, an acid sensing GPCR, is upregulated in radioresistant GBM. Usage of Lorazepam, which has off target agonism of GPR68, is linked to worse clinical outcomes for a variety of cancers. However, the role of tumor microenvironment acidification in GPR68 activation has not been assessed in cancer. Here we interrogate the role of GPR68 specifically in GBM cells using a novel highly specific small molecule inhibitor of GPR68 named Ogremorphin (OGM) to induce the iron mediated cell death pathway: ferroptosis.

METHOD:

OGM was identified in a non-biased zebrafish embryonic development screen and validated with Morpholino and CRISPR based approaches. Next, A GPI-anchored pH reporter, pHluorin2, was stably expressed in U87 glioblastoma cells to probe extracellular acidification. Cell survival assays, via nuclei counting and cell titer glo, were used to demonstrate sensitivity to GPR68 inhibition in twelve immortalized and PDX GBM lines. To determine GPR68 inhibition's mechanism of cell death we use DAVID pathway analysis of RNAseq. Our major indication, ferroptosis, was then confirmed by western blotting and qRT-PCR of reporter genes including TFRC. This finding was further validated by transmission electron microscopy and liperfluo staining to assess lipid peroxidation. Lastly, we use siRNA and CRISPRi to demonstrate the critical role of ATF4 suppression via GPR68 for GBM survival.

RESULTS:

We used a pHLourin2 probe to demonstrate how glioblastoma cells acidify their microenvironment to activate the commonly over expressed acid sensing GPCR, GPR68. Using our small molecule inhibitor OGM and genetic means, we show that blocking GPR68 signaling results in robust cell death in all thirteen glioblastoma cell lines tested, irrespective of genetic and phenotypic heterogeneity, or resistance to the mainstay GBM chemotherapeutic temozolomide. We use U87 and U138 glioblastoma cell lines to show how selective induction of ferroptosis occurs in an ATF4-dependent manner. Importantly, OGM was not-acutely toxic to zebrafish and its inhibitory effects were found to spare non-malignant neural cells.

CONCLUSION:

These results indicate GPR68 emerges as a critical sensor for an autocrine pro-tumorigenic signaling cascade triggered by extracellular acidification in glioblastoma cells. In this context, GPR68 suppresses ATF4, inhibition of GPR68 increases expression of ATF4 which leads to ferroptotic cell death. These findings provide a promising therapeutic approach to selectively induce ferroptosis in glioblastoma cells while sparing healthy neural tissue.

项与 GPR68 相关的新闻（医药）

2024-02-19

·BioSpace

Certa Therapeutics’ FT011 Granted US FDA Fast Track for the Treatment of Systemic Sclerosis

MELBOURNE, Australia, Feb. 19, 2024 (GLOBE NEWSWIRE) -- Certa Therapeutics (Certa), a biotechnology company developing innovative precision therapies for patients with inflammatory and fibrotic diseases, today announces that the U.S. Food and Drug Administration (FDA) has granted Fast Track Designation for its investigational therapy FT011 for the treatment of systemic sclerosis (scleroderma), having previously granted Orphan Drug Designation.[1] The Fast Track Designation was granted based on results of the previously announced Phase 2 study which indicated that treatment of scleroderma patients with FT011 for 12 weeks resulted in a clinically meaningful improvement in 60% of patients treated with FT011 400mg and 20% of patients in the FT011 200mg group compared with 10% in the placebo group.[2] The FDA’s Fast Track program is designed to facilitate the expedited development and review of new drugs that are intended to treat serious or life-threatening conditions and demonstrate the potential to address unmet medical needs.[3] FT011 is a novel, first-in-class oral therapy for the treatment of chronic fibrosis in multiple organs. It targets a previously important but undrugged membrane GPCR receptor, GPCR68, with an extensive body of data demonstrating promising efficacy in multiple models of fibrotic disease. Transcriptomic research has validated the mechanism of action and demonstrated that treatment with FT011 results in reversal in the activation of genetic markers associated with fibrosis, providing potential for a precision therapy.[4] Professor Darren Kelly, Certa Therapeutics CEO and founder said, “We are thrilled to have received Fast Track Designation which supports further acceleration of the FT011 clinical development program. It also provides validation of FT011’s potential to offer patients with scleroderma the first anti-fibrotic and disease modifying treatment of this type.” “We know that this debilitating and life-threatening disease can severely impact the lives of patients and to date existing treatments only focus on the relief and management of symptoms, whereas FT011 precisely targets the root cause of fibrosis and has the potential to offer treatment across multiple organs within these patients.” Under the Fast Track Designation, the FT011 development program for scleroderma is eligible for various expedited regulatory review processes, including generally more frequent FDA interactions, potential eligibility for rolling review of a New Drug Application (NDA) and accelerated approval and priority review of an NDA. Certa is progressing preparations toward a pivotal clinical trial of FT011 as a treatment for scleroderma. Supported by global clinical experts, the clinical trial design and associated development plans will be discussed with the FDA as soon as possible in 2024, with complementary scientific advice sought from the EMA mid-2024, with the aim of starting the pivotal study in late-2024. C Denton, W Stevens, N Kruger, M Papadimitriou, F Khong, M Bradney, D Kelly, R Lafyatis “FT011 for the Treatment of Systemic Sclerosis. Results from a Phase II Study” Arthritis Rheumatol. 2023;75(suppl 9). Abstract 2593. U.S. Food and Drug Administration. Fast Track. Available at: Accessed January 23, 2022. S Eddy, et al., “Identification of Non-Invasive Surrogates as Predictors of Response to FT011 in Kidney Disease” ASN Kidney Week 2022, abstract 3767783. Media – Australia Kirrily Davis, E: kdavis@bcpvc.com M: +61 (0)401 220228 Media - International Sue Charles, Charles Consultants E: sue.charles@charles-consultants.com M: +44 (0)7968 726585 About Systemic Sclerosis (Scleroderma) Scleroderma is an extremely debilitating, potentially life-threatening autoimmune condition characterised by inflammation and fibrosis of the skin and other organs (commonly the lungs, kidneys, and heart). This condition results in high morbidity with substantial detriment on quality of life, with patients commonly experiencing loss of mobility and function, pain, fatigue, often accompanied with a significant impact to their mental health. Scleroderma has the highest mortality among rheumatic diseases. About Certa Therapeutics Certa Therapeutics is a clinical-stage biotechnology company focused on improving lives by treating patients with debilitating diseases via novel targeted therapies. Certa Therapeutics has designed a platform of candidate drugs and validated the role of GPR68, a defined G protein-coupled receptor (GPCR) receptor which mediates signalling pathways associated with inflammation and fibrosis. GPR68 is silent in healthy tissue but activated following injury or disease. Evidence demonstrates the role of GPR68 on multiple downstream pathways causing inflammation and fibrosis. These targeted drug candidates have established proof of concept as potential treatments for multiple fibrotic diseases including serious and chronic conditions impacting the kidney, lung, eye, skin, and heart. The morbidity and mortality impact of fibrotic diseases is substantial, ultimately causing 45% of all deaths globally. Significant breakthroughs are urgently needed in this field, addressing a market worth more than US$15B annually. The company is seeking to combine its innovative therapeutics with biomarkers and genetic analysis to identify those patients most likely to benefit from treatment, providing potential for a precision therapy. FT011 is an investigational product which has not received marketing authorisation or approval by any regulatory agency, including the US Food and Drug Administration, the European Medicines Agency, or the Australian Therapeutic Goods Agency. The investigational drug products being developed by Certa Therapeutics are undergoing clinical studies to evaluate the safety and effectiveness in humans. In the company’s lead program, FT011 is being developed as a novel, first-in-class oral therapy for the treatment of systemic sclerosis (scleroderma) and has successfully completed a multi-national, double-blinded randomised controlled trial. It has been awarded Orphan Drug Designation and Fast Track by the FDA. Follow us on LinkedIn :

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