Purpose: Overexpression of the receptor tyrosine kinase Axl is implicated in several cancers.Therefore, we conducted this study to determine the expression of Axl and its ligand Gas6 in various renal cell carcinoma (RCC) types and in oncocytoma. Experimental Design: Real-time quantitative reverse transcription-PCR was used to quantify tumor mRNA levels for Axl and Gas6 in a cohort (n = 221) of RCC patients. Serum levels of soluble sAxl and Gas6 proteins were measured using specific ELISA assays (n = 282). The presence of Axl protein in tumor tissue was evaluated by immunohistochemistry (n = 294). Results were correlated to tumor-associated variables, clinical biochemical tests, and patient survival. Results: Tumor Axl mRNA levels correlated independently to survival when assessed against tumor stage and grade. In the study group, the median cancer-specific survival of all RCC patients during 307 months of follow-up was 55 months (confidence interval, F40.4). The 25% of patients with lowest tumor Axl mRNA levels had significantly better survival than the rest (P = 0.0005), with 70% of the patients still alive at the end of follow-up. In contrast, in patients with medium-high Axl mRNA, only 25% were alive at the end of follow-up. Tumor Gas6 mRNA levels correlated to survival, tumor-associated variables, and disease severity as did serum levels of soluble sAxl and Gas6 protein. However, no correlation between Axl protein in tumor tissue and survival was found. Conclusions: Axl and Gas6 expression in RCC are associated with tumor advancement and patient survival. In particular, low tumorAxl mRNA levels independently correlated with improved survival.Renal cell carcinoma (RCC) represents f2% to 3% of all human cancers (1), being the most common cancer of the adult kidney (2). The prevalence is skewed between men and women (1.5:1), and RCC incidence peaks at 60 to 70 years of age (3). The only curative treatment of RCC is surgery (4). Today, smaller and less advanced RCC tumors are detected by imaging techniques, such as ultrasound and computed tomography, and nephron-sparing surgery of tumors <4 cm in diameter is an alternative that provides recurrence-free and long-term survival rates (5). However, the outcome of metastatic RCC is poor and mortality remains very high with a median cancer-specific survival of 21 months (6, 7). Treatment of metastatic RCC, in addition to removal of primary tumor and resection of metastases, is palliative and includes systemic therapies, such as immunotherapy (e.g., IFNa). Recently, a number of promising tyrosine kinase inhibitors are approved both in the United States and Europe for treatment of metastatic RCC (5).RCC is composed of different tumor types, including conventional or clear cell RCC (cRCC; representing the majority of RCCs, 75-85%), papillary RCC (pRCC; 10-15%), chromophobe RCC (chRCC; 4-5%), collecting duct carcinoma (<1%), and unclassified RCC (5%; ref. 8). In f4% to 5% of the cases, benign oncocytoma is diagnosed when RCC is suspected (9). The more aggressive ...

Objective Inflammation is associated with major depressive disorder (MDD) and suicidal behavior. According to the ‘leaky gut hypothesis’, increased intestinal permeability may contribute to this relationship via bacterial translocation across enterocytes. We measured plasma levels of gut permeability markers, in patients with a recent suicide attempt (rSA), MDD subjects with no history of a suicide attempt (nsMDD), and healthy controls (HC), and related these markers to symptom severity and inflammation. Method We enrolled rSA (n = 54), nsMDD (n = 13), and HC (n = 17). Zonulin, intestinal fatty acid binding protein (I‐FABP), soluble CD14, and interleukin‐6 (IL‐6) were quantified in plasma. Montgomery–Åsberg Depression Rating Scale (MADRS) and Suicide Assessment Scale (SUAS) were used for symptom assessments. Results The rSA group displayed higher I‐FABP and lower zonulin levels compared with both the nsMDD and the HC groups (all P < 0.001). IL‐6 correlated positively with I‐FABP (r = 0.24, P < 0.05) and negatively with zonulin (r = −0.25, P < 0.05). In all subjects, I‐FABP levels correlated positively with MADRS (r = 0.25, P < 0.05) and SUAS scores (r = 0.38, P < 0.001), and the latter correlation was significant also in the nsMDD group (r = 0.60, P < 0.05). Conclusion The ‘leaky gut hypothesis’ may improve our understanding of the link between inflammation and suicidal behavior. These findings should be considered preliminary until replicated in larger cohorts.

The soluble urokinase plasminogen activator receptor (suPAR) has been detected in blood, plasma, serum, urine, ovarian cystic fluid, and cerebrospinal fluid. Elevated suPAR levels in plasma have been associated with negative outcomes in various diseases, such as bacteremia, sepsis, SIRS, cardiovascular disease, cancer, and tuberculosis. The primary aim of this study was to investigate whether suPAR can be detected in saliva from healthy individuals and thus, if saliva suPAR can be related to plasma suPAR, CRP, BMI, or gender. Blood and unstimulated whole saliva was collected from 20 healthy individuals (10 female and 10 male, median age of 28 years; range 21–41). CRP and suPAR were measured with ELISA in saliva and serum/plasma. suPAR was detected in all saliva samples in the 5.2–28.1 ng/mL range, with a median value of 17.1 ng/mL. Saliva suPAR was significantly higher (P < 0.001) but not correlated to plasma suPAR in healthy young adults with normal plasma suPAR levels. suPAR and CRP levels were correlated in blood but not in saliva. No correlation was found between BMI, age, or gender and suPAR in saliva.

BackgroundThe molecular biology of renal cell carcinoma (RCC) is complex and not fully understood. We have recently found that the expression of the receptor tyrosine kinase Axl in the RCC tumors independently correlates with survival of the patients.Principal FindingsHere, we have investigated the role of Axl and its ligand Gas6, the vitamin-K dependent protein product of the growth arrest-specific gene 6, in clear cell RCC (ccRCC) derived cells. The Axl protein was highly expressed in ccRCC cells deficient in functional von Hippel-Lindau (VHL) protein, a tumor suppressor gene often inactivated in ccRCC. VHL reconstituted cells expressed decreased levels of Axl protein, but not Axl mRNA, suggesting VHL to regulate Axl expression. Gas6-mediated activation of Axl in ccRCC cells resulted in Axl phosphorylation, receptor down-regulation, decreased cell-viability and migratory capacity. No effects of the Gas6/Axl system could be detected on invasion. Moreover, in ccRCC tumor tissues, Axl was phosphorylated and Gas6 γ-carboxylated, suggesting these molecules to be active in vivo.SignificanceThese results provide novel information regarding the complex function of the Gas6/Axl system in ccRCC.

No abstract