An atlas of epithelial cell states and plasticity in lung adenocarcinoma.

Understanding the cellular processes that underlie early lung adenocarcinoma (LUAD) development is needed to devise intervention strategies1. Here we studied 246,102 single epithelial cells from 16 early-stage LUADs and 47 matched normal lung samples. Epithelial cells comprised diverse normal and cancer cell states, and diversity among cancer cells was strongly linked to LUAD-specific oncogenic drivers. KRAS mutant cancer cells showed distinct transcriptional features, reduced differentiation and low levels of aneuploidy. Non-malignant areas surrounding human LUAD samples were enriched with alveolar intermediate cells that displayed elevated KRT8 expression (termed KRT8+ alveolar intermediate cells (KACs) here), reduced differentiation, increased plasticity and driver KRAS mutations. Expression profiles of KACs were enriched in lung precancer cells and in LUAD cells and signified poor survival. In mice exposed to tobacco carcinogen, KACs emerged before lung tumours and persisted for months after cessation of carcinogen exposure. Moreover, they acquired Kras mutations and conveyed sensitivity to targeted KRAS inhibition in KAC-enriched organoids derived from alveolar type 2 (AT2) cells. Last, lineage-labelling of AT2 cells or KRT8+ cells following carcinogen exposure showed that KACs are possible intermediates in AT2-to-tumour cell transformation. This study provides new insights into epithelial cell states at the root of LUAD development, and such states could harbour potential targets for prevention or intervention.

Pathogenesis of Tobacco-Associated Lung Adenocarcinoma Is Closely Coupled with Changes in the Gut and Lung Microbiomes.

Microbial dysbiosis has emerged as a modulator of oncogenesis and response to therapy, particularly in lung cancer. Here, we investigate the evolution of the gut and lung microbiomes following exposure to a tobacco carcinogen. We performed 16S rRNA-Seq of fecal and lung samples collected prior to and at several timepoints following (nicotine-specific nitrosamine ketone/NNK) exposure in Gprc5a-/- mice that were previously shown to exhibit accelerated lung adenocarcinoma (LUAD) development following NNK exposure. We found significant progressive changes in human-relevant gut and lung microbiome members (e.g., Odoribacter, Alistipes, Akkermansia, and Ruminococus) that are closely associated with the phenotypic development of LUAD and immunotherapeutic response in human lung cancer patients. These changes were associated with decreased short-chain fatty acids (propionic acid and butyric acid) following exposure to NNK. We next sought to study the impact of Lcn2 expression, a bacterial growth inhibitor, given our previous findings on its protective role in LUAD development. Indeed, we found that the loss of Lcn2 was associated with widespread gut and lung microbiome changes at all timepoints, distinct from those observed in our Gprc5a-/- mouse model, including a decrease in abundance and diversity. Our overall findings apprise novel cues implicating microbial phenotypes in the development of tobacco-associated LUAD.

Activation of UPR Signaling Pathway is Associated With the Malignant Progression and Poor Prognosis in Prostate Cancer.

BACKGROUND: Currently, the role of UPR signaling in prostate cancer (PCa) is unclear. To evaluate the relationship between UPR signaling pathway and the prognosis of PCa, we explored the expression of IRE1, PERK, and ATF6 in tissues. METHODS: A total of 160 PCa and 30 benign prostate hyperplasia (BPH) tissues were collected. The expression of UPR signaling factors was assessed by immunohistochemistry. The staining characteristics were identified and evaluated for associations with clinicopathologic parameters, PSA recurrence survival, and prostate cancer-specific morality. RESULTS: The expressions of ATF6α, PERK, and IRE1α were significantly associated with Gleason grade, PSA level, T stages and M stage, while this association was not significant in N stage. Additionally, UPR signaling factors expressed correlatively with each other. In further studies, high expression level of UPR signaling factors was usually detected in patients who suffered poor prognosis. Patients with positive UPR signaling factors meet shorter survival duration both on cancer-specific morality and PSA recurrence. Multivariate analysis showed that IRE1α (HR = 4.461 95%CI = 1.270-15.670 P = 0.020) could be a potential factor in predicting PSA recurrence independently. CONCLUSIONS: UPR signaling factors were co-activated and activation of UPR signaling was implicated to the malignant progression and worse prognosis of PCa. The mechanism and function of UPR signaling in PCa are still to be determined. Prostate 77:274-281, 2017. © 2016 Wiley Periodicals, Inc.

Intravenous alanyl-L-glutamine balances glucose-insulin homeostasis and facilitates recovery in patients undergoing colonic resection: a randomised controlled trial.

BACKGROUND: Glucose and insulin homeostasis are altered in patients undergoing gastro-intestinal tumour resection and affect the postsurgical outcomes. OBJECTIVES: To evaluate the impact of dipeptide alanyl-L-glutamine supplementation on glucose-insulin homeostasis, inflammatory mediators and surgical recovery in patients undergoing colonic cancer resection. DESIGN: A randomised controlled trial. SETTING: Southeast University Affiliated Zhongda Hospital, China, from January 2011 to May 2011. PARTICIPANTS: Patients aged 35 to 75 years, ASA physical status I-II, scheduled for elective colon cancer resection. INTERVENTIONS: Sixty patients were randomised into one of the three groups and received 22.4 ml kg of physiological saline, a 8.5% 18AA-II solution (a compound amino acid) or glutamine 0.5 g kg, given 24 h before and 1 h after the start of the surgical procedure. PRIMARY OUTCOMES MEASURE: Insulin resistance index and insulin sensitivity check index. Secondary outcomes included blood glucose, insulin, tumour necrosis factor-alpha (TNF-α) and free fatty acid measured at 24 h before surgery (T1), 30 min before anaesthesia (T2), 2.5 h after the beginning of surgery (T3), and 1 h (T4) and 24 h (T5) after the end of surgery. The time of first passage of wind and the length of hospital stay were recorded. RESULTS: Intraoperative and postoperative insulin resistance or calculated insulin sensitivity were worse in the physiological saline and 18AA-II treated patients compared with those treated with glutamine (P < 0.05). Blood glucose increased intraoperatively and postoperatively in all three groups compared with baselines (P < 0.05), but glutamine attentuated the peak level of blood glucose (P < 0.05). Glutamine reduced the intraoperative and postoperative concentrations of TNF-α and free fatty acid, (P < 0.05), and shortened the time to the first passage of wind after surgery and the length of hospital stay (P < 0.05). CONCLUSION: Intravenous supplementation with glutamine balances glucose-insulin homeostasis and facilitates recovery in patients undergoing colon cancer resection.

Paraneoplastic renal dysfunction in fly cancer models driven by inflammatory activation of stem cells.

Tumors can induce systemic disturbances in distant organs, leading to physiological changes that enhance host morbidity. In Drosophila cancer models, tumors have been known for decades to cause hypervolemic 'bloating' of the abdominal cavity. Here we use allograft and transgenic tumors to show that hosts display fluid retention associated with autonomously defective secretory capacity of fly renal tubules, which function analogous to those of the human kidney. Excretion from these organs is blocked by abnormal cells that originate from inappropriate activation of normally quiescent renal stem cells (RSCs). Blockage is initiated by IL-6-like oncokines that perturb renal water-transporting cells, and trigger a damage response in RSCs that proceeds pathologically. Thus, a chronic inflammatory state produced by the tumor causes paraneoplastic fluid dysregulation by altering cellular homeostasis of host renal units.

Effect of indwelling time of double J tube on infected ureteral calculi and the distribution of pathogenic characteristics in diabetics.

OBJECTIVE: To investigate the effect of double J tube indwelling time on infected ureteral calculi (UC) and distribution of pathogenic characteristics in diabetics. METHODS: 132 diabetics with infected UC admitted to our hospital from April 2017 to April 2020 were selected. All patients were implanted with a double J tube, followed by percutaneous nephrolithotomy or ureteroscopic holmium laser lithotripsy. According to the indwelling time, they were divided into a research group (≤ 7 d, 60 cases) and a control group (> 7 d, 72 cases). We compared the baseline data, and surgical data of the two groups, and analyzed pathogenic bacteria. RESULTS: None of the differences in the operation time, hospital stay, and stone diameter were statistically significant (P > 0.05). Before placement of the double J tube, no striking differences in urinary white blood cells and blood white blood cells were observed between the two groups (P > 0.05). 7 days after the placement of the double J tube, a significant decrease of the urinary white blood cells and blood white blood cells was recorded (P < 0.05), with no significant differences between the two groups (P > 0.05). Before and after placement of double J tube, no striking differences in body temperature > 38.5°C or positive blood culture were observed between the two groups (P > 0.05). Surgical methods, stone removal rate one month after the operation, or incidence of postoperative complications were not significantly different (P > 0.05). 49 pathogenic strains were detected, among which Gram-negative bacteria accounted for 63.27%. The main pathogens were Escherichia coli and Pseudomonas aeruginosa. CONCLUSION: The indwelling time of the double J tube has no significant effect on the effectiveness and safety in diabetic patients with infected UC. It is necessary to reduce the indwelling time and implement targeted stone surgery.

In situ gelling gelrite/alginate formulations as vehicles for ophthalmic drug delivery.

The objective of this study was to develop an ion-activated in situ gelling vehicle for ophthalmic delivery of matrine. The rheological properties of polymer solutions, including Gelrite, alginate, and Gelrite/alginate solution, were evaluated. In addition, the effect of formulation characteristics on in vitro release and in vivo precorneal drug kinetic of matrine was investigated. It was found that the optimum concentration of Gelrite solution for the in situ gel-forming delivery systems was 0.3% (w/w) and that for alginate solution was 1.4% (w/w). The mixture of 0.2% Gelrite and 0.6% alginate solutions showed a significant enhancement in gel strength at physiological condition. On the basis of the in vitro results, the Gelrite formulations of matrine-containing alginate released the drug most slowly. For each tested polymer solution, the concentration of matrine in the precorneal area was higher than that of matrine-containing simulated tear fluid (STF) almost at each time point (p < 0.05). The area under the curve of formulation 16 (0.2%Gelrite/0.6%alginate) was 4.65 times greater than that of containing matrine STF. Both the in vitro release and in vivo pharmacological studies indicated that the Gelrite/alginate solution had the better ability to retain drug than the Gelrite or alginate solutions alone. The tested formulation was found to be almost non-irritant in the ocular irritancy test. The overall results of this study revealed that the Gelrite/alginate mixture can be used as an in situ gelling vehicle to enhance ocular retention.

Two Brain Pathways Initiate Distinct Forward Walking Programs in Drosophila.

An animal at rest or engaged in stationary behaviors can instantaneously initiate goal-directed walking. How descending brain inputs trigger rapid transitions from a non-walking state to an appropriate walking state is unclear. Here, we identify two neuronal types, P9 and BPN, in the Drosophila brain that, upon activation, initiate and maintain two distinct coordinated walking patterns. P9 drives forward walking with ipsilateral turning, receives inputs from central courtship-promoting neurons and visual projection neurons, and is necessary for a male to pursue a female during courtship. In contrast, BPN drives straight, forward walking and is not required during courtship. BPN is instead recruited during and required for fast, straight, forward walking bouts. Thus, this study reveals separate brain pathways for object-directed walking and fast, straight, forward walking, providing insight into how the brain initiates context-appropriate walking programs.

High expression of citron kinase predicts poor prognosis of prostate cancer.

Citron kinase (CIT) is a Rho-effector protein kinase that is associated with several types of cancer. However, the role of CIT in prostate cancer (PCa) is unclear. The current study utilized microarray data obtained from The Cancer Genome Atlas, which was analyzed via Biometric Research Program array tools. Additionally, reverse transcription-quantitative (RT-q)PCR was performed to compare the mRNA expression of CIT in PCa tissue and in benign prostatic hyperplasia. The protein expression of CIT was detected in a consecutive cohort via immunochemistry and CIT was screened as a potential oncogene in PCa. The results of RT-qPCR demonstrated that the mRNA expression of CIT was increased in PCa tissues. Furthermore, immunochemistry revealed that CIT protein expression was positively associated with age at diagnosis, Gleason grade, serum PSA, clinical T stage, risk group, lymph node invasion and metastasis. When compared with the low expression group, patients with a high CIT expression exhibited shorter survival rates, cancer specific mortalities (CSM) and biochemical recurrence (BCR). In addition, multivariate analysis revealed that CIT was a potential predictor of CSM and BCR. The results revealed that CIT is overexpressed during the malignant progression of PCa and may be a predictor of a poor patient prognosis.