Development of a Time-Resolved Fluorescence Immunoassay for the Diagnosis of Hepatocellular Carcinoma Based on the Detection of Glypican-3.

Glypican-3(GPC3), an oncofetal protein, is a potential novel marker for hepatocellular carcinoma (HCC). In this study, we attempted to establish a new method to detect serum GPC3 using the antibodies identified in our previous research, and then evaluated its clinical application for the diagnosis of HCC. Herein, a sandwich time-resolved fluorescence immunoassay (TRFIA) for detecting serum GPC3 was developed. The detection limit, analytical recovery, specificity and precision of the proposed TRFIA assay were satisfactory. A total of 415 patients were collected and divided into seven groups: hepatocellular carcinoma (101), colorectal cancer (67), gastric cancer (44), esophageal cancer (15), cirrhosis (55), hepatitis (61), normal liver (72). Using this proposed method, the concentration of serum GPC3 in these clinical samples was detected. The results demonstrated that the levels of GPC3 in serum from HCC patients were significantly higher than that in others. Compared with the results of chemiluminescence immunoassay (CLIA), a high consistency (Kappa =0.84) was observed. Thus, an effective, sensitive and reliable TRFIA-GPC3 kit for diagnosing HCC was successfully developed. It offers a suitable alternative to existed methods of determining GPC3 and is expected to be used in clinic in the future.

Rapid and Sensitive Lateral Flow Immunoassay Method for Procalcitonin (PCT) Based on Time-Resolved Immunochromatography.

Procalcitonin (PCT) is a current, frequently-used marker for severe bacterial infection. The aim of this study was to develop a cost-effective detection kit for rapid quantitative and on-site detection of PCT. To develop the new PCT quantitative detecting kit, a double-antibody sandwich immunofluorescent assay was employed based on time-resolved immunofluorescent assay (TRFIA) combined with lateral flow immunoassay (LFIA). The performance of the new developed kit was evaluated in the aspects of linearity, precision, accuracy, and specificity. Two-hundred thirty-four serum samples were enrolled to carry out the comparison test. The new PCT quantitative detecting kit exhibited a higher sensitivity (0.08 ng/mL). The inter-assay coefficient of variation (CV) and the intra-assay CV were 5.4%-7.7% and 5.7%-13.4%, respectively. The recovery rates ranged from 93% to 105%. Furthermore, a high correlation (n = 234, r = 0.977, p < 0.0001) and consistency (Kappa = 0.875) were obtained when compared with the PCT kit from Roche Elecsys BRAHMS. Thus, the new quantitative method for detecting PCT has been successfully established. The results indicated that the newly-developed system based on TRFIA combined with LFIA was suitable for rapid and on-site detection for PCT, which might be a useful platform for other biomarkers in point-of-care tests.

The Establishment of an HE4-CLIA Method and the Combined Analysis of HE4 and CA125 in Ovarian Cancer.

BACKGROUND: The human epididymal secretory protein 4 (HE4) is a novel, verified biomarker for the early diagnosis of ovarian cancer. METHODS: Magnetic beads were coated with capture antibodies and were used with acridinium ester labeled detection antibodies in a sandwich-type immunoassay. The patient's HE4 serum levels were measured simultaneously with the chemiluminescence immunoassay (CLIA) kit we developed and electrochemiluminescence immunoassay (ECLIA) kit from Roche (Mannheim, Germany). CA125 was also detected by time-resolved fluoroimmunoassay. The diagnostic value was analyzed. RESULTS: The assay demonstrated a linear range from 2.5 to 2,000 pmol/l, with an analytical sensitivity of 2.5 pmol/l. The reproducibility, recovery, and specificity of the immunoassay were demonstrated to be acceptable. Compared with the ECLIA kit from Roche in 124 serum samples (40 patients with ovarian cancer, 35 patients with benign gynecological diseases, and 49 health controls), there is a satisfied correlation coefficient of 0.875. The area under the receiver-operating curve (ROC-AUC) was 0.903 (95% CI was 0.839-0.966, P < 0.001) for HE4, 0.787 (95% CI was 0.694-0.879, P < 0.001) for CA125, and 0.914 (95% CI was 0.866-0.962, P < 0.001) for combined analysis of HE4 and CA125. CONCLUSIONS: A quantitative method (HE4-CLIA) for detecting HE4 in serum was successfully established. Preliminary clinical sample analysis showed HE4-CLIA has a certain clinical value in the screening and diagnosis of ovarian cancer. Moreover, in distinguishing benign from malignant ovarian lesions, HE4 has higher demonstrated accuracy than CA125.

Heatstroke induces liver injury via IL-1ß and HMGB1-induced pyroptosis.

BACKGROUND & AIMS: Liver injury is a common complication of heat stroke (HS), and often constitutes a direct cause for patient death. The cellular and molecular mechanism underlying HS-induced liver injury remains unclear. Recent evidence indicates that inflammasome plays an important role in mediating sterile inflammation triggered by tissue damage. Using a rat HS model, we identified a novel mechanism by which inflammasome-dependent interleukin-1ß (IL-1ß) activation and hepatocyte pyroptosis mediate HS-induced liver injury. METHODS: To induce HS, rats were subjected to heat exposure. Inhibition of inflammasomes was achieved by RNA silencing and pharmacologic inhibitor prior to heat exposure. Inflammasome assembly, caspase-1 activation, histological changes, as well as serum levels of liver enzymes were measured. RESULTS: We demonstrated that the onset of HS activated inflammasome in the liver as evidenced by increased capase-1 activity and the association of inflammasome components NOD-like receptor family pyrin domain containing 3 (Nlrp3) and apoptosis speck-like protein containing a caspase-recruitment domain (ASC); and the activated inflammasome, in turn, induced IL-1ß activation and hepatocyte pyroptosis, and subsequent augmented liver injury. HS-induced hepatocyte inflammasome activation seems to be high-mobility group box 1 (HMGB1) dependent. Inhibition of Nlrp3, caspase-1, or HMGB1 prevented HS-induced liver inflammation and ameliorated liver injury. CONCLUSIONS: These findings demonstrate an important role of HMGB1 in mediating inflammasome activation in the development of liver injury following HS, and suggest that targeting inflammasome may represent a novel therapeutic strategy to limit cell death and prevent liver failure after HS.

Development of a clinical chemiluminescent immunoassay for serum GPC3 and simultaneous measurements alone with AFP and CK19 in diagnosis of hepatocellular carcinoma.

BACKGROUND: Glypican-3 (GPC3) is an oncofetal antigen that shows great promise as a biomarker for diagnosis of hepatocellular carcinoma (HCC), but there is no reliable kit that can be used to detect it in clinics. The aim of this study is to develop a stable performance kit for GPC3 detection in clinics. DESIGN AND METHODS: The paired antibodies were identified through cycle-screening methods based on our previous research. Then, a double antibodies sandwich chemiluminescent immunoassay for detecting serum GPC3 was developed. The performance of the developed GPC3 diagnostic kit was evaluated by detecting the concentration of serum GPC3 and assessing its single or combined use with alpha fetoprotein (AFP) and cytokeratin 19 fragment (CK19) for HCC diagnosis. RESULTS: The assay demonstrated a linear range of 10-800 ng/ml, the cross-reactivity rate at 0.018% (AFP), 0.020% (carcino-embryonic antigen), and 0.021% (CK19), respectively. The minimum detectable concentration was 0.05 ng/ml; the intraassay coefficient of variation (CV) and interassay CV were both less than 10%, with good stability and reproducibility. GPC3 has a high sensitivity (54.2%) and specificity (99.4%) in diagnosing HCC. The level of GPC3 in HCC was robust higher than that in healthy or other liver diseases' sera (108.67 ± 230.04 ng/ml vs. 3.99 ± 7.68 ng/ml). The diagnostic sensitivity of GPC3 single or combined with CK19 and AFP for HCC was evaluated, and the rates were 54.2 and 90.6%, respectively. CONCLUSIONS: An applicable chemiluminescent immunoassay with stable performance against GPC3 in diagnosing HCC has been established and the combination of GPC3 with CK19 and AFP could improve the diagnostic sensitivity for HCC.

Evaluation of the analytical and clinical performances of time-resolved fluoroimmunoassay for detecting carcinoma antigen 50.

We developed a TR-FIA kit for quantitative detection of CA50. This study aims to evaluate the analytical and clinical performances of this kit. Precision, accuracy, specificity, sensitivity, stability, and endogenous interference of this kit are evaluated. Reference range is established. Coincidence rate and correlation between TR-FIA and RIA are evaluated. ROC is adopted to evaluate the diagnostic performance. This kit shows excellent precision with a coefficients of variation (CVs) ranged from 2.2-9.3%, accuracy (average recovery, 98.5%), sensitivity (minimum detectable concentration is 0.2 U/mL), specificity (all cross-reactivity is less than 0.1% except CA199, which is 0.175%), and storage stability (recoveries, 90.8-100.4%). Bilirubin, hemoglobin, and triglyceride dose not interfere with CA50 detection (recovery, 97.13-109.1%). The range from 0-25 U/mL is chosen as the reference range. There are good correlation (r = 0.804) and coincidence (p = 0.608, kappa = 0.924) between TR-FIA and RIA. Diagnostic performance of this kits, which based on RIA results, is perfect (AUC = 0.996), and the diagnostic accuracy for malignancy diagnosis is in moderate degree (AUC, 0.802-0.861). The TR-FIA (CA50) kit performs well in analytical and clinical performances, and can be employed in the clinical diagnosis of malignancy.

Global, regional, and national burden of trachea, bronchus, and lung cancer among women of reproductive age, 1990-2019.

BACKGROUND: Trachea, bronchus, and lung (TBL) cancer has demonstrated a discernible feminization and a tendency towards younger onset in recent decades. Therefore, our objective is to examine the most recent patterns in the worldwide prevalence of TBL among women of reproductive age on a global, regional, and national scale. METHODS: To assess the prevalence trends of TBL in women of reproductive age, we calculated the estimated annual percentage change (EAPC), age-standardized incidence rate (ASIR), age-standardized death rate (ASDR), and disability-adjusted life years (DALYs) for 204 countries and territories from 1990 to 2019. These calculations were based on the Global Burden of Disease (GBD) 2019 database. RESULTS: From 1990 to 2019, there was a global increase in the absolute number of incidence cases, deaths, and DALYs of TBL in women of reproductive age. However, the ASIR, ASDR, and age-standardized DALY rates were decreasing over this period, with EAPC of -0.77 (95 % confidence interval [CI]: -1.03 to -0.51), -1.08 (95 % CI: -1.34 to -0.82), and -1.10 (95 % CI: -1.36 to -0.84), respectively. This trend was observed even in regions with higher Socio-Demographic Index (SDI). East Asia consistently had the highest ASIR, ASDR, and age-standardized DALY rate, but there was a decreasing trend. Conversely, Eastern Sub-Saharan Africa displayed an increasing burden pattern. When examining countries individually, Monaco, Greenland, and Palau had the highest ASIR. Moreover, in most countries, the ASIR for TBL increased with age, particularly among women aged 35-49 years. CONCLUSIONS: Despite a global decline in ASIR, ASDR, and age-standardized DALY rates for TBL in women of reproductive age over the past three decades, there is still a troubling increase observed in low- and low-middle SDI regions. It is crucial to implement effective preventive and curative measures in these regions in order to address this concerning trend.

Predicting the risk of lung cancer using machine learning: A large study based on UK Biobank.

In response to the high incidence and poor prognosis of lung cancer, this study tends to develop a generalizable lung-cancer prediction model by using machine learning to define high-risk groups and realize the early identification and prevention of lung cancer. We included 467,888 participants from UK Biobank, using lung cancer incidence as an outcome variable, including 49 previously known high-risk factors and less studied or unstudied predictors. We developed multivariate prediction models using multiple machine learning models, namely logistic regression, naïve Bayes, random forest, and extreme gradient boosting models. The performance of the models was evaluated by calculating the areas under their receiver operating characteristic curves, Brier loss, log loss, precision, recall, and F1 scores. The Shapley additive explanations interpreter was used to visualize the models. Three were ultimately 4299 cases of lung cancer that were diagnosed in our sample. The model containing all the predictors had good predictive power, and the extreme gradient boosting model had the best performance with an area under curve of 0.998. New important predictive factors for lung cancer were also identified, namely hip circumference, waist circumference, number of cigarettes previously smoked daily, neuroticism score, age, and forced expiratory volume in 1 second. The predictive model established by incorporating novel predictive factors can be of value in the early identification of lung cancer. It may be helpful in stratifying individuals and selecting those at higher risk for inclusion in screening programs.

Nonfactoid Question Answering as Query-Focused Summarization With Graph-Enhanced Multihop Inference.

Nonfactoid question answering (QA) is one of the most extensive yet challenging applications and research areas in natural language processing (NLP). Existing methods fall short of handling the long-distance and complex semantic relations between the question and the document sentences. In this work, we propose a novel query-focused summarization method, namely a graph-enhanced multihop query-focused summarizer (GMQS), to tackle the nonfactoid QA problem. Specifically, we leverage graph-enhanced reasoning techniques to elaborate the multihop inference process in nonfactoid QA. Three types of graphs with different semantic relations, namely semantic relevance, topical coherence, and coreference linking, are constructed for explicitly capturing the question-document and sentence-sentence interrelationships. Relational graph attention network (RGAT) is then developed to aggregate the multirelational information accordingly. In addition, the proposed method can be adapted to both extractive and abstractive applications as well as be mutually enhanced by joint learning. Experimental results show that the proposed method consistently outperforms both existing extractive and abstractive methods on two nonfactoid QA datasets, WikiHow and PubMedQA, and possesses the capability of performing explainable multihop reasoning.

RN181 suppresses hepatocellular carcinoma growth by inhibition of the ERK/MAPK pathway.

UNLABELLED: The activation of oncogenes and the inactivation of tumor suppressor genes by mutations or chronic hepatitis virus infections play key roles in the pathogenesis of hepatocellular carcinoma (HCC). Here we report that RN181, a really interesting new gene finger domain-containing protein, was down-regulated in highly malignant cell lines and in tumor cells of 139 HCC clinical samples in comparison with adjacent normal liver tissues. The expression of RN181 was strongly associated with the pathological grade of HCC. Alterations of the expression of RN181 by retrovirus-transduced up-regulation and short hairpin RNA-mediated down-regulation demonstrated the function of RN181 as a tumor suppressor because it decreased the proliferation and colony formation of HCC cells in vitro and inhibited tumor growth in vivo by suppressing cell proliferation and enhancing cell apoptosis in xenografted tumors. Proteomic analyses showed that RN181 regulates the expression of many proteins that are important in many cellular processes. Statistical analyses identified 33 proteins with consistent changes (≥2-fold) in RN181-transformed cells. Ten of these proteins were up-regulated by RN181, and 23 were down-regulated. Representative proteins were validated by western blotting. Interaction network investigations revealed that 20 RN181-regulated proteins could integrate several key biological processes such as survival, metabolism, and mitogen-activated protein kinase (MAPK) pathways. Remarkably, 11 of the 33 proteins are associated with MAPK signaling in one or more ways. RN181 suppressed the tyrosine phosphorylation of extracellular signal-regulated kinase 1/2 (ERK1/2) in cell lines and in tumor cells of xenografts and HCC clinical samples, and removing the suppression increased tumor growth. CONCLUSION: We have shown that RN181 suppresses the tumorigenesis of HCC through the inhibition of ERK/MAPK signaling in the liver. Our results provide new insights into the pathogenesis of HCC and may help with the development of novel therapeutic strategies.

Risk-association of CYP11A1 polymorphisms and breast cancer among Han Chinese women in Southern China.

Exposure to endogenous sex hormones has been reported as a risk factor for breast cancer. The CYP11A1 gene encodes the key enzyme that catalyzes the initial and rate-limiting step in steroid hormone synthesis. In this study, the associations between single nucleotide polymorphisms (SNPs) in CYP11A1 and breast cancer susceptibility were examined. Six SNPs in CYP11A1 were genotyped using the MassARRAY IPLEX platform in 530 breast cancer patients and 546 healthy controls. Association analyses based on a χ(2) test and binary logistic regression were performed to determine the odds ratio (OR) and 95% confidence interval (95% CI) for each SNP. Two loci (rs2959008 and rs2279357) showed evidence of associations with breast cancer risk. The variant genotype C/T-C/C of rs2959008 was significantly associated with a decreased risk (age-adjusted OR, 0.75; 95% CI, 0.58-0.96; P = 0.023) compared with the wild-type TT. However, the homozygous TT variant of rs2279357 exhibited increased susceptibility to breast cancer (age-adjusted OR, 1.44; 95% CI, 1.05-1.98; P = 0.022). The locus rs2959003 also showed an appreciable effect, but no associations were observed for three other SNPs. Our results suggest that polymorphisms of CYP11A1 are related to breast cancer susceptibility in Han Chinese women of South China.

Aberrant CpG island hypermethylation and down-regulation of Oct-6 mRNA expression in human hepatocellular carcinoma.

BACKGROUND: Aberrant CpG island hypermethylation is a major epigenetic mechanism that can inactivate the transcription of cancer-related genes. PURPOSE: This study aimed to investigate whether Oct-6 transcription was regulated by CpG island methylation in hepatocellular carcinoma (HCC). METHODS: Quantitative real-time PCR and the MassARRAY platform (Sequenom) were employed in 38 HCC tissues samples and four cell lines. RESULTS: The levels of Oct-6 mRNA were decreased by more than twofold in 31 of 38 tumor tissues compared to that of adjacent non-cancerous tissues. Among the 31 tumor tissues with lower levels of Oct-6 mRNA, 17 tumor tissues also had higher methylation levels in Oct-6 CpG island. Based on these results, we hypothesized that CpG island hypermethylation may down-regulate Oct-6 mRNA expression in HCC. To confirm this hypothesis, we also analyzed the changes in Oct-6 mRNA expression and CpG island methylation in four HCC cell lines (Huh7, Bel-7402, HepG2 and SMMC-7721) after treatment with 0.1, 0.5 and 2.5 µM 5-Aza-2-deoxycytidine (5-Aza-CdR), a demethylating agent. The results demonstrated that the CpG island methylation levels decreased and Oct-6 mRNA levels increased in a dose-dependent manner in both Huh7 and Bel7402 cells, but there were only slight changes in HepG2 cell. Interestingly, there were no significant alterations of Oct-6 mRNA levels observed in SMMC7721 cell; although lower levels of CpG island methylation were detected after treatment with 5-Aza-CdR. CONCLUSIONS: Our study shows that CpG island hypermethylation contributes to down-regulation of Oct-6 mRNA expression in HCC.

The role of translationally controlled tumor protein in tumor growth and metastasis of colon adenocarcinoma cells.

Translationally controlled tumor protein (TCTP) plays a major role in a broad array of biological processes. However, the TCTP-related biological process and interactive proteins still remain poorly characterized. In the present study, we found that knockdown of TCTP inhibited proliferation, migration, and invasion activities of LoVo cells in vitro and in vivo. The whole-cell proteomes were compared by 2D gel electrophoresis before and after knockdown of TCTP. Alterations in 27 proteins were detected and their identities were revealed by mass spectrometry analysis. Components of Ubiquitin-Proteasome System, proteins involved in the cytoskeleton biosynthesis and tumor metastasis were found to be changed upon TCTP removal. These results imply that TCTP might play at least a partial role in colon adenocarcinoma progression.

Determination of median levels of the free beta subunit of human chorionic gonadotropin in women from Mainland China using a new time-resolved fluoroimmunoassay.

BACKGROUND: The free beta subunit of human chorionic gonadotropin (free beta-hCG) is an important serum marker for biochemical screening. Its weekly median value varies with ethnicity. Most of the fluorometers for lanthanide chelates are designed for the detection of signals from europium (Eu(3+)) chelates only. METHODS: We developed a two-site, one-step assay using two monoclonal antibodies (MAbs) against free beta subunit and beta subunit with Eu(3+) chelates as labels. Using the present assay, we evaluated 24,634 normal serum samples in Chinese pregnant women during 8-20 weeks of gestation. RESULTS: The detection limit using this assay was <0.05 ng/mL. The within-run and between-run imprecision was <6.0% and 7.0% using control material. Free beta-hCG concentrations measured using the current assay in 999 maternal serum samples correlated well with those obtained by samarium (Sm(3+))-labeled DELFIA free hCGbeta assay (r=0.987). The medians for 8-20 weeks for maternal serum free beta-hCG were higher in the women from mainland China compared to reports from other countries. CONCLUSIONS: The present assay is suitable for use in biochemical screening of women in mainland China. Our study on the median concentrations of free beta-hCG will help establish reference values that are specific for ethnic populations from the Chinese mainland. These will be useful for studying the importance of ethnic factors in biochemical screening.

Comprehensive analysis of ALK, ROS1 and RET rearrangements in locally advanced rectal cancer.

Gene rearrangements, such as anaplastic lymphoma kinase (ALK), c-ros oncogene 1 receptor tyrosine kinase (ROS1), rearranged during transfection (RET) and neurotrophic receptor tyrosine kinase 1 (NTRK1), identified in cancer have been indicated to be robust therapeutic targets in lung carcinomas. However, a few studies have focussed on locally advanced rectal cancer (LARC). The discovery of novel gene fusions is also valuable for LARC research. We used mass spectrometry-based assays and RNA sequencing to detect both known ALK, ROS1, RET and NTRK1 rearrangements and novel gene fusions in LARC patients. FusionMap was also used to find gene fusions. None of the ALK, ROS1, RET or NTRK1 gene fusions were detected by mass spectrometry-based assays or RNA sequencing. Three fusion candidates, integrin subunit beta 7 (ITGB7)-ROS1, lamin A/C (LMNA)-NTRK1 and Golgi-associated PDZ and coiled-coil motif containing (GOPC)-keratin 8 (KRT8), showed relatively high junction-spanning reads by the FusionMap algorithm, but did not pass validation. These results suggest that no ALK, ROS1 or RET rearrangements were found in LARC.

Diagnostic value of glypican-3, arginase-1 and hepatocyte paraffin antigen -1 in differentiating hepatocellular carcinoma from intrahepatic cholangiocarcinoma.

BACKGROUND: The aim of the present study was to investigate the diagnostic value of glypican-3 (GPC3), arginase-1 (Arg-1), and hepatocyte paraffin antigen 1 (HepPar-1) in differentiating hepatocellular carcinoma (HCC) from intrahepatic cholangiocarcinoma (ICC). METHODS: The expression of GPC3, HepPar-1 and Arg-1 were measured by immunohistochemistry in 47 cases of HCC, 29 cases of ICC and their paracancerous tissues. RESULTS: A high expression of GPC3, Arg-1 and HepPar-1 was observed in HCC tissues (68.09%, 76.60% and 78.72%, respectively; P>0.0125) while it was lower in ICC tissues (6.90%, 6.90% and 13.79%, respectively; P>0.0125). With regard to specificity, GPC3 performed better than Arg-1 and HepPar-1 (97.37% vs. 1.32% and 2.63%, respectively; P<0.05). The positive rate in poorly differentiated HCC for either GPC3, Arg-1 or HepPar-1 was lower than that in well- and moderately differentiated HCC. The majority of positive samples for GPC3 and Arg-1 were grade 2+ in well-, moderately- or poorly-differentiated HCC. Combined detection of GPC3, Arg-1 and HepPar-1 could increase the sensitivity up to 89.36% and the specificity to 100.00%, comparing with any single biomarker (P<0.05). CONCLUSIONS: GPC3, Arg-1 and HepPar-1 were all useful biomarkers in differentiating HCC from ICC. The combination models could improve the diagnosis value of HCC and help differentiating HCC from ICC.

Targeting SGK1 enhances the efficacy of radiotherapy in locally advanced rectal cancer.

Radiotherapy (RT) is a key component of neoadjuvant chemoradiotherapy to treat locally advanced rectal cancer (LARC). However, the therapeutic effect is limited due to radioresistance. Investigating the biomarkers of radioresistance might assist in the development of more effective therapeutic strategies for LARC.In this study, we investigated the different gene expressions in tumor samples from 110 patients using transcriptome analysis and immunohistochemistry (IHC), and identified serum- and glucocorticoid-regulated kinase 1 (SGK1) as a modulator of LARC radioresistance. We evaluated the impact of genetic and pharmacologic inhibition of the gene associated with radioresistance in vitro and in vivo. We found that the expression of SGK1 was upregulated in non-pathological complete response (non-pCR) patients. A high SGK1 expression was associated with radioresistance, whereas the genetic or pharmacologic inhibition of SGK1 expression reduced the radioresistance. We found that activate transcription factor 3 (ATF3) is a regulator of SGK1 in radioresistance.In conclusion, our findings indicate that SGK1 is a key player in LARC radioresistance, and drives radioresistance in an ATF3 dependent manner, which provides insights for future radio-sensitizer design.

Dexmedetomidine Attenuates Acute Lung Injury Induced by Heatstroke and Improve Outcome.

INTRODUCTION: Dexmedetomidine (DEX) has been demonstrated to inhibit inflammatory response and protect against multiorgan injury in various scenarios. The objectives of the present study were to ascertain whether DEX is able to attenuate acute lung injury (ALI) under heatstroke (HS), and to explore the underlying mechanism. METHODS: Male C57BL/6 mice were exposed to ambient temperature of 39.5 ±â€Š0.2°C until core temperature reach 43°C. DEX or 0.9% saline was injected i.p. immediately. At the end of the experiment, bronchoalveolar lavage fluid (BALF) and lung tissue were harvested. RESULTS: HS induce ALI and pulmonary dysfunction, while DEX treatment could significantly inhibit lung injury and improve respiratory dysfunction under HS. The overall effect was beneficial and improved the 72 h cumulative survival rate of mice with HS. Furthermore, HS significantly elevated the levels of cytokines in BALF, as well as increased the activity of toll-like receptor 4 (TLR4)/MyD88/nuclear factor-κB (NFκB) signaling pathway in lung tissue, while DEX treatment could inhibit such effects. Finally, DEX could upregulate the expression of caveolin 1 downregulated by HS, which may contribute to the inhibition of TLR4/MyD88/NFκB signaling pathway. DISCUSSION: In conclusion, the present results indicated that DEX may protect against lung inflammatory response and injury under HS via TLR4/MyD88/NFκB signaling pathway, and caveolin-1 may participate in the effects.