Risk factors for the long-term persistent genitourinary toxicity after stereotactic body radiation therapy for localized prostate cancer: A single-center, retrospective study of 306 patients.

OBJECTIVES: To identify risk factors for the long-term persistent genitourinary toxicity (GUT) after stereotactic body radiation therapy (SBRT) for localized prostate cancer (PCa). METHODS: A total of 306 patients who underwent SBRT at our institution between March 2017 and April 2022 were retrospectively evaluated. SBRT was performed at 35 Gy in five fractions over 5 or 10 days. Factors related to the long-term persistence of acute GUT after SBRT were analyzed. RESULTS: During the median follow-up period of 39.1 months, 203 (66%) patients experienced any grade of acute GUT, which remained in 78 (26%) patients 6 months after SBRT. Multivariate analysis revealed that age ≥75 years was consistently a significant independent risk factor for any grade of acute GUT 6, 12, and 24 months after SBRT (hazard ratio [HR] 2.31, p = 0.010; HR 2.84, p = 0001; and HR 3.05, p = 0.009, respectively). Older age was not a significant risk factor for the development of grade ≥2 acute GUT. The duration of acute GUT was significantly longer in the older group than in the nonolder group (median duration = 234 vs. 61 days, p < 0.001), and the incidence of persistent GUT was significantly more frequent in the older group beyond 6 months after SBRT. CONCLUSIONS: Older age is a significant independent risk factor for the long-term persistent GUT after SBRT for localized PCa.

Gustave Roussy Immune score as a prognostic biomarker in patients with platinum-refractory metastatic urothelial carcinoma treated with pembrolizumab: YUSHIMA study.

BACKGROUND: This study aimed to investigate the prognostic value of the Gustave Roussy Immune score (GRIm-score) in platinum-refractory metastatic urothelial carcinoma (UC) treated with pembrolizumab. METHODS: This multicenter retrospective study (YUSHIMA study) evaluated 331 patients with metastatic UC treated with pembrolizumab after platinum-based chemotherapy between January 2018 and June 2023 at 13 institutions. We collected pretreatment variables, including the GRIm-score based on serum albumin, lactate dehydrogenase, and neutrophil-to-lymphocyte ratio. The patients were divided into low and high GRIm-score groups. Prognostic factors for overall survival (OS) and progression-free survival (PFS) were determined using the multivariate Cox proportional hazard model. RESULTS: During the median follow-up period of 7.3 months, 278 (84%) patients showed disease progression, and 223 (67%) died from any cause. Multivariate analysis revealed that the high GRIm-score group was an independent and significant adverse prognostic factor of both OS and PFS (hazard ratio, 1.65 and 1.82, respectively; both p < 0.001) along with Eastern Cooperative Oncology Group Performance Status of ≥ 2 (both p < 0.001), presence of visceral metastasis (both p < 0.001), and hemoglobin of < 9.2 g/dL (p = 0.030 and p = 0.038). C-reactive protein of > 42 mg/L was a significant prognostic factor for OS (p = 0.001). CONCLUSION: The GRIm-score is an independent prognostic marker for survival outcomes in patients with platinum-refractory metastatic UC treated with pembrolizumab.

Superior detection of significant prostate cancer by transperineal prostate biopsy using MRI-transrectal ultrasound fusion image guidance over cognitive registration.

BACKGROUND: The BioJet system allows the fusion of magnetic resonance imaging (MRI) images with real-time transrectal ultrasonography to accurately direct biopsy needles to the target lesions. To date, the superiority of targeted biopsy using the BioJet system over cognitive registration remains unknown. METHODS: This retrospective study included 171 biopsy-naïve men with elevated prostate-specific antigen (2.5-20 ng/mL) and MRI-positive lesions; 74 and 97 men underwent a four-core targeted biopsy per MRI-positive target lesion and a 14-core systematic biopsy transperineally using the BioJet system and cognitive registration, respectively. Detection rates of significant cancer, defined as grade group ≥ 2 or maximum cancer length ≥ 5 mm, were compared between the BioJet system and cognitive registration using propensity score matching and a multivariate logistic regression model. RESULTS: After propensity score matching (67 men for each group), the detection rates of significant cancer were significantly higher in the BioJet group than in the cognitive group for both targeted (76% vs. 46%, P = 0.002) and systematic (70% vs. 46%, P = 0.018) biopsy. Multivariate analysis of the entire cohort also showed that the BioJet system was independently associated with significant cancer detection by targeted and systematic biopsy (P < 0.01), along with a higher prostate-specific antigen density and a higher prostate imaging reporting and data system score. CONCLUSIONS: Transperineal prostate biopsy using the BioJet system is superior to cognitive registration in detecting significant cancer for targeted and systematic biopsies.

Impact of diagnostic ureteral catheterization on intravesical tumour recurrence following radical nephroureterectomy for upper tract urothelial carcinoma.

PURPOSE: To investigate whether even a minimally invasive diagnostic procedure for the upper tract such as ureteral catheterization (UCath) may substantially increase the risk of intravesical recurrence (IVR) in patients with upper tract urothelial carcinoma (UTUC) treated with radical nephroureterectomy (RNU). METHODS: The present, retrospective study enrolled 163 patients undergoing RNU for UTUC between 2010 and 2021 at two, tertiary care hospitals. The primary endpoint was the association between UCath and IVR-free survival (IVRFS). The secondary endpoints were the association of ureterorenoscopy (URS) and URS biopsy (URSBx) with IVRFS. Directed acyclic graph (DAG)-guided multivariable models were used to adjust for potential confounders. RESULTS: Of the 163 patients, 128 (79%), 88 (54%), and 67 (41%) received UCath, URS, and URSBx, respectively. URS was performed concurrently with UCath. During the follow-up period (median: 47 months), IVR developed in 62 patients (5-year IVRFS rate: 52%). A DAG included concurrent bladder cancer, tumour size, hydronephrosis, positive cytology, and multiple UTUCs as potential confounders of the association between UCath and IVR. Both DAG-guided and stepwise multivariable models revealed a significant association between UCath and IVR (hazard ratio: 17.8; P < 0.001). UCath was also associated with shorter IVRFS in a subset of 75 patients who had not received URS (P < 0.001). In contrast, URS and URSBx were not associated with IVR in patients who had received UCath and URS, respectively. CONCLUSION: Any diagnostic manipulations of the upper urinary tract, even a minimally invasive procedure like UCath, could confer a risk of post-RNU IVR in UTUC patients.

Controlling Nutritional Status (CONUT) Score and Sarcopenia as Mutually Independent Prognostic Biomarkers in Advanced Urothelial Carcinoma.

Background: While the controlling nutritional status (CONUT) score and sarcopenia are objective indices of different aspects of a patient's general condition, few studies have comprehensively examined their mutual relationship in patients with advanced cancer. Methods: This retrospective study included 200 Japanese patients with advanced urothelial carcinoma (aUC). Sarcopenia was diagnosed using Prado's definition. The CONUT score and sarcopenia were examined for their possible association, and their prognostic value was analyzed. Results: The CONUT score and sarcopenia were not significantly associated. While sarcopenia occurred in 168 patients (84%), more than half of them had normal or only slightly impaired nutritional status, as indicated by a CONUT score of 0−2. During follow-up (median: 13.3 months), 149 patients died. The CONUT score and sarcopenia were independent prognostic factors (hazard ratio 1.22 and 2.23, respectively; both p < 0.001), whereas performance status was not. Incorporating the CONUT score, sarcopenia, and both into Bajorin's and Apolo's prognostic models increased their concordance index as follows: 0.612 for Bajorin's original model to 0.653 (+the CONUT score), 0.631 (+sarcopenia), and 0.665 (+both), and 0.634 for Apolo's original model to 0.655 (+the CONUT score), 0.653 (+ sarcopenia), and 0.668 (+both). Conclusion: The CONUT score and sarcopenia were mutually independent in terms of their prognostic value in patients with aUC. These objective indices of a patient's general condition may help in decision-making when considering treatment for patients with aUC.

Gingival epithelial cell-derived microvesicles activate mineralization in gingival fibroblasts.

Soft tissue calcification occurs in many parts of the body, including the gingival tissue. Epithelial cell-derived MVs can control many functions in fibroblasts but their role in regulating mineralization has not been explored. We hypothesized that microvesicles (MVs) derived from gingival epithelial cells could regulate calcification of gingival fibroblast cultures in osteogenic environment. Human gingival fibroblasts (HGFs) were cultured in osteogenic differentiation medium with or without human gingival epithelial cell-derived MV stimulation. Mineralization of the cultures, localization of the MVs and mineral deposits in the HGF cultures were assessed. Gene expression changes associated with MV exposure were analyzed using gene expression profiling and real-time qPCR. Within a week of exposure, epithelial MVs stimulated robust mineralization of HGF cultures that was further enhanced by four weeks. The MVs taken up by the HGF's did not calcify themselves but induced intracellular accumulation of minerals. HGF gene expression profiling after short exposure to MVs demonstrated relative dominance of inflammation-related genes that showed increases in gene expression. In later cultures, OSX, BSP and MMPs were significantly upregulated by the MVs. These results suggest for the first time that epithelial cells maybe associated with the ectopic mineralization process often observed in the soft tissues.

Adverse Prognostic Impact of Diagnostic Ureterorenoscopy in a Subset of Patients with High-Risk Upper Tract Urothelial Carcinoma Treated with Radical Nephroureterectomy.

Background: We hypothesized that diagnostic ureterorenoscopy (URS) may adversely affect prognosis in a subset of patients with high-risk upper tract urothelial carcinoma (UTUC) undergoing radical nephroureterectomy (RNU). Methods: The present retrospective study included 143 patients with UTUC treated between 2010 and 2021 at two tertiary care hospitals, of whom 79 received URS prior to RNU. Subgroups were stratified by clinicopathological variables relevant to prognosis. The primary endpoint was to evaluate the prognostic impact of URS on overall survival (OS) and progression-free survival (PFS) after RNU. Results: During follow-up (median 54 months for survivors), 32 cases of all-cause mortality and 40 cases of progression were recorded. No significant difference was found in OS or PFS between patients with and without URS. Subgroup analysis demonstrated that URS was significantly associated with worse OS (p < 0.001) and PFS (p = 0.008) in 29 patients with non-papillary and ≥pT3 UTUC. Importantly, URS did not have any adverse effects on prognosis in 62 patients with papillary and ≤pT2 UTUC (p = 0.005). Conclusions: URS may adversely affect prognosis of UTUC patients, specifically non-papillary and ≥pT3 disease. URS may better be avoided in patients with high-risk UTUC features unless URS is necessary to diagnose UTUC. This study also corroborates the oncological safety of URS in those with low-risk UTUC.

Preoperative models incorporating the systemic immune-inflammation index for predicting prognosis and muscle invasion in patients with non-metastatic upper tract urothelial carcinoma.

OBJECTIVE: To develop preoperative models as a guide to indications for neoadjuvant chemotherapy (NAC) and regional lymph node dissection (LND) before and at radical nephroureterectomy (RNU), respectively, in patients with non-metastatic upper tract urothelial carcinoma (UTUC) by incorporating the systemic immune-inflammation index (SII). METHODS: This retrospective study enrolled 103 consecutive patients with UTUC undergoing RNU. The SII was calculated as neutrophils × platelets / lymphocytes. Multivariable Cox proportional hazard model was used to develop preoperative models for cancer-specific survival (CSS) and overall survival (OS). A model for predicting muscle invasion was developed using logistic regression analysis. Harrell's concordance-index (c-index) or the area under the receiver operating characteristic curve (AUC) was used to evaluate the accuracy of the models. RESULTS: During follow-up (median: 41 months), 26 and three patients died of UTUC and other causes, respectively. Performance status > 0, clinical tumor (cT) stage ≥ 3, and SII > 520 were independent adverse prognosticators for CSS, and one point was assigned to each prognosticator. Risk score models comprising the sum of the points stratified patients into three risk groups (0, 1, and 2-3; P < 0.001 for CSS and OS) with respective c-indices of 0.843 and 0.820. SII > 677 and ≥ cT3 were independently associated with muscle invasion. A model based on these variables predicted muscle invasion with AUC of 0.804. CONCLUSION: Preoperative SII is significantly associated with worse survival outcomes and muscle invasion in patients with non-metastatic UTUC. Our preoperative predictive models may serve as a guide to indications for NAC and LND.

Impact of Serum γ-Glutamyltransferase on Overall Survival in Men with Metastatic Castration-Resistant Prostate Cancer Treated with Docetaxel.

BACKGROUND: Reports on the prognostic significance of serum γ-glutamyltransferase (GGT) in men with metastatic castration-resistant prostate cancer (mCRPC) are limited. In addition, GGT expression status in cancer tissues has not been well characterized regardless of cancer types. METHODS: This retrospective study included 107 consecutive men with mCRPC receiving docetaxel therapy. The primary endpoints were associations of serum GGT with overall survival (OS) and prostate-specific antigen (PSA) response. The secondary endpoint was an association of serum GGT with progression-free survival (PFS). Additionally, GGT expression status was immunohistochemically semi-quantified using tissue microarrays. RESULTS: A total of 67 (63%) men died during follow-up periods (median 22.5 months for survivors). On multivariable analysis, high Log GGT was independently associated with adverse OS (HR 1.49, p = 0.006) as were low hemoglobin (HR 0.79, p = 0.002) and high PSA (HR 1.40, p < 0.001). In contrast, serum GGT was not significantly associated with PSA response or PFS. Moreover, incorporation of serum GGT into established prognostic models (i.e., Halabi and Smaletz models) increased their C-indices for predicting OS from 0.772 to 0.787 (p = 0.066) and from 0.777 to 0.785 (p = 0.118), respectively. Furthermore, there was a positive correlation between serum and tissue GGT levels (ρ = 0.53, p = 0.003). CONCLUSIONS: Serum GGT may be a prognostic biomarker in men with mCRPC receiving docetaxel therapy. GGT overexpression by prostate cancer cells appears to be responsible for the elevation of GGT in the serum.

Prognostic significance of the controlling nutritional status score in patients with metastatic renal cell carcinoma diagnosed before an era of first-line immune-oncology combination therapies.

OBJECTIVE: To explore the prognostic role of the controlling nutritional status score in patients with metastatic renal cell carcinoma. METHODS: We retrospectively analyzed 107 patients with metastatic renal cell carcinoma who received their diagnosis between 2007 and 2018 and were treated with or without a first-line interferon or tyrosine kinase inhibitor at a single cancer center. The controlling nutritional status score was based on values for albumin, lymphocyte count and total cholesterol at the metastatic renal cell carcinoma diagnosis. Association of the controlling nutritional status score and clinical variables, including the Memorial Sloan-Kettering Cancer Center and the International Metastatic Renal Cell Carcinoma Database Consortium risk classifications, with overall survival was examined using the Cox proportional hazard model. Predictive accuracy of the prognostic factors was assessed using Harrell's concordance index. RESULTS: First-line interferon and tyrosine kinase inhibitor were given to 48 (45%) and 41 (38%) patients, respectively, and 28 (26%) and 33 (31%) patients underwent cytoreductive nephrectomy and metastasectomy, respectively. During follow-up (median: 36.3 months), 64 patients died. The median controlling nutritional status score was 2 (range: 0-8). A controlling nutritional status score ≥ 2 was significantly associated with shorter overall survival (P < 0.01) independently of the Memorial Sloan-Kettering Cancer Center and International Metastatic Renal Cell Carcinoma Database Consortium risk classifications. Integration of the controlling nutritional status score into the Memorial Sloan-Kettering Cancer Center and International Metastatic Renal Cell Carcinoma Database Consortium risk classifications improved concordance index from 0.702 to 0.770 and from 0.698 to 0.749, respectively. CONCLUSION: The controlling nutritional status score may serve as a prognostic biomarker objectively reflecting the general physical condition of patients with metastatic renal cell carcinoma treated with or without first-line interferon or tyrosine kinase inhibitor in terms of nutritional and immuno-inflammatory status.

Novel anatomical apical dissection utilizing puboprostatic "open-collar" technique: Impact on apical surgical margin and early continence recovery.

PURPOSE: To evaluate the impact of modifications to anatomical apical dissection including a puboprostatic open-collar technique, which visualizes the lateral aspect of the apex and dorsal vein complex (DVC) covering the rhabdosphincter while preserving the puboprostatic collar, on positive surgical margin (PSM) and continence recovery. METHODS: One-hundred-and-sixty-seven patients underwent gasless single-port retroperitoneoscopic radical prostatectomy using a three-dimensional head-mounted display system. Sequentially modified surgical techniques comprised puboprostatic open-collar technique, sutureless transection of the DVC, retrograde urethral dissection, and anterior reconstruction. The associations of these modifications with PSM and continence recovery were assessed. RESULTS: The puboprostatic open-collar technique, sutureless DVC transection, and retrograde urethral dissection were significantly associated with lower apical PSM (P = 0.003, 0.003, and 0.010, respectively). The former two also showed similar associations in 84 patients with anterior apical tumor (P = 0.021 and 0.030, respectively). Among 92 patients undergoing all of these three procedures, overall and apical PSM rates were 13.0% and 3.3%, respectively. Retrograde urethral dissection (odds ratio [OR] 2.73, P = 0.004) together with nerve sparing (OR 2.77, P = 0.003) and anterior apical tumor (OR 0.45, P = 0.017) were independently associated with immediate continence recovery. A multivariable model for 3-month continence recovery included anterior apical tumor (OR 0.28, P = 0.003) and puboprostatic open-collar technique (OR 3.42, P = 0.062). Immediate and 3-month continence recovery rates were 56.3% and 85.4%, respectively, in 103 patients undergoing both the puboprostatic open-collar technique and retrograde urethral dissection. CONCLUSION: Novel anatomical apical dissection utilizing a puboprostatic open-collar technique may favorably impact on both apical surgical margin and continence recovery.

Gelatin Methacryloyl-Riboflavin (GelMA-RF) Hydrogels for Bone Regeneration.

Gelatin methacryloyl (GelMA) is a versatile biomaterial that has been used in various biomedical fields. UV light is commonly used to photocrosslink such materials; however, its use has raised several biosafety concerns. We investigated the mechanical and biological properties of a visible-wavelength (VW)-light-crosslinked gelatin-based hydrogel to evaluate its viability as a scaffold for bone regeneration in bone-destructive disease treatment. Irgacure2959 or riboflavin was added as a photoinitiator to create GelMA solutions. GelMA solutions were poured into a mold and exposed to either UV or VW light. KUSA-A1 cell-laden GelMA hydrogels were crosslinked and then cultured. Mechanical characterization revealed that the stiffness range of GelMA-RF hydrogel was suitable for osteoblast differentiation. KUSA-A1 cells encapsulated in GelMA hydrogels photopolymerized with VW light displayed significantly higher cell viability than cells encapsulated in hydrogels photopolymerized with UV light. We also show that the expression of osteogenesis-related genes at a late stage of osteoblast differentiation in osteoblasts encapsulated in GelMA-RF hydrogel was markedly increased under osteoblast differentiation-inducing conditions. The GelMA-RF hydrogel served as an excellent scaffold for the encapsulation of osteoblasts. GelMA-RF hydrogel-encapsulated osteoblasts have the potential not only to help regenerate bone mass but also to treat complex bone defects associated with bone-destructive diseases such as periodontitis.

Glucagon-Like Peptide-1 Receptor Agonist Liraglutide Ameliorates the Development of Periodontitis.

Periodontitis is one of the diabetic complications due to its high morbidity and severity in patients with diabetes. The prevention of periodontitis is especially important in diabetic patients because the relationship between diabetes and periodontitis is bidirectional. Here, we evaluated the impacts of glucagon-like peptide-1 (GLP-1) receptor agonist liraglutide on the amelioration of periodontitis. Five-wk-old Male Sprague-Dawley (SD) rats (n = 30) were divided into 3 groups: normal, periodontitis, and periodontitis with liraglutide treatment groups. Periodontitis was induced by ligature around the maxillary second molar in SD rats. Half of the rats were administered liraglutide for 2 weeks. Periodontitis was evaluated by histological staining, gene expressions of inflammatory cytokines in gingiva, and microcomputed tomography. Periodontitis increased inflammatory cell infiltration, macrophage accumulation, and gene expressions of tumor necrosis factor-α and inducible nitric oxide synthase in the gingiva, all of which were ameliorated by liraglutide. Liraglutide decreased M1 macrophages but did not affect M2 macrophages in periodontitis. Moreover, ligature-induced alveolar bone resorption was ameliorated by liraglutide. Liraglutide treatment also reduced osteoclasts on the alveolar bone surface. These results highlight the beyond glucose-lowering effects of liraglutide on the treatment of periodontitis.

[IMPACT OF MEMBRANOUS URETHRAL LENGTH IN DE NOVO STRESS URINARY INCONTINENCE FOLLOWING HOLMIUM LASER ENUCLEATION OF THE PROSTATE].

(Purpose) Holmium laser enucleation of the prostate (HoLEP) is widely performed in recent years; however, difficulties of surgical techniques and high frequency of postoperative stress urinary incontinence (SUI) remain as significant problems. We determined the predictive factors for de novo SUI after HoLEP. (Patients and methods) A total of 303 patients with benign prostatic hyperplasia who underwent HoLEP were retrospectively evaluated between July 2013 and April 2019. Of these, 109 patients underwent MRI preoperatively. Patients who were unable to answer the questionnaire regarding their SUI because of dementia, those who presented with SUI preoperatively, and those with placed Foley catheter at the time of MRI were excluded. Hence, a total of 83 patients were eligible for the present study. We recorded the MRI findings and clinical variables, including membranous urethral length (MUL), transitional zone (TZ) volume, serum prostate-specific antigen levels, operative time, and presence or absence of SUI. The predictive factors for de novo SUI were determined using multivariable logistic regression analysis. (Results)De novo SUI occurred in 19 (22.9%) patients but disappeared in 16 (84.2%) patients at a mean duration of 14 weeks. The mean MUL was 17.2 mm. Univariate analysis showed that MRI TZ volume >40 mL, MUL ≤17 mm, operative time >100 min, and enucleation time >50 min were associated with de novo SUI. In multivariable logistic regression analysis, MUL ≤17 mm (odds ratio [OR], 23.81; 95% confidence interval [CI], 4.34-447.19; P < 0.0001) and operative time >100 min (OR, 3.91; 95% CI, 1.20-14.01; P = 0.023) were significantly associated with de novo SUI. (Conclusions) Although de novo SUI occurred occasionally after HoLEP, most of them improved in about 3 months. The MRI measurement of MUL was shown to be a practical tool for predicting de novo SUI after HoLEP.

Impact of Bladder Neck Involvement on Recurrence in Patients With Non-muscle-invasive Bladder Cancer: An Analysis Based on a Time-dependent Model.

BACKGROUND: Tumor location in bladder neck has reported to be a prognostic factor for non-muscle-invasive bladder cancer (NMIBC). We investigated the impact of bladder neck involvement (BNI) on recurrence in NMIBC using time-dependent covariate analysis. PATIENTS AND METHODS: We enrolled 585 Japanese patients who underwent transurethral resection for bladder tumors at a single center from 2000 to 2016 and were pathologically diagnosed with Ta and T1 NMIBC. Each patient at each recurrence was assigned to a separate time-dependent stratum with its own baseline hazard function according to the Prentice-Williams-Peterson gap time model for analyzing recurrent events. RESULTS: Over a median follow-up period of 41.3 months (interquartile range, 18.0-82.3 months), 253 (43.2%) patients experienced a total of 475 recurrences. Among the 1001 total transurethral resection procedures, BNI was observed in 122 (12.2%) cases. The 3-year cumulative recurrence rates of patients with and without BNI were 62.5% and 46.3%, respectively. Multivariable analysis revealed that number of tumors ≥ 4 (sub-hazard ratio [SHR], 1.48; P = .004), intravesical bacillus Calmette-Guérin therapy (SHR, 0.44; P < .001), and BNI (SHR, 1.59; P = .004) were all independent predictors of recurrence. Assigning 1 point for each of these 3 predictive factors, the resulting scores enabled us to classify patients into 3 prognostic groups that were clearly stratified according to recurrence. CONCLUSIONS: Our time-dependent covariate analysis shows that BNI is a significant risk factor for recurrence in NMIBC. Our prognostic model incorporating BNI is an easy means of estimating recurrence risk and determining optimal management for individual patients.

Age-related changes of CD4+ T cell migration and cytokine expression in germ-free and SPF mice periodontium.

OBJECTIVE: Increasing age is a potential risk factor for periodontal tissue breakdown, which may be affected by commensal flora. The aim of this study evaluated age-related changes in CD4+ T cells, C-C chemokine ligand 5 (CCL5), interleukin (IL)-17A, and receptor activator of nuclear factor-kappa B ligand (RANKL) expression using germ-free (GF) and conventionally reared (SPF) mice. DESIGN: GF and SPF mice at 8 (n = 6/group) and 22 weeks old (n = 6/group) were used. Immunohistochemical analyses were performed to determine the effects of aging on protein expression in periodontal tissues. Age-related changes in alveolar bone were quantified using micro-CT analysis. RESULTS: SPF mice, but not GF mice, showed an age-related increase in alveolar bone loss (P < 0.01). SPF mice at 22 weeks of age increased expression of CD4+ T cells, CCL5, IL-17A, and RANKL compared to those at 8 weeks of age in connective tissue and alveolar bone surface (P < 0.01). Furthermore, there was increased CD4+ T cells, which were co-expressed with IL-17A and RANKL in SPF mice at 22 weeks of age. On the other hand, the GF mice did not show any significant differences in CD4+ T cells, CCL5, IL-17A and RANKL expression between the two age groups. CONCLUSIONS: SPF mice induced an age-related increase in CD4+ T cells co- expressed with IL-17A and RANKL, with occurring alveolar bone loss. In contrast, GF mice did not show age-related changes in CD4+ T cell migration and cytokine expression.

Rheological approach for determining yield stresses in flowable resin composites prior to setting.

The purpose of this study is to develop a method for quantifying the fluidity of flowable resin composites using determinations of yield stress. Five commercially available composites (AliteFlo LV, Flow-it ALC, Venus flow, Tetric N-flow, Revolution Formula2) were investigated. Yield stress values were obtained by plotting shear stresses for a range of shear rates, followed by fitting of Casson fluid models to flow curve data and extrapolation to the stress axis. To confirm that yield stress reflected fluidity, apparent viscosity at the lower shear rate (0.2 s-1) was calculated from flow curves. Yield stresses ranged from 5.4 to 43.1 Pa, and were found to capture differences in the fluidity of composites that were not captured by viscosity measurement at the low shear rate. Yield stress is directly proportional to fluidity, and could serve as a simple and precise indicator for selecting flowable resin composites for use in various clinical applications.

Role of poly(ADP-ribose) polymerase activation in the pathogenesis of periodontitis in diabetes.

AIM: The aetiology of progressive periodontitis in diabetes has not yet been elucidated. We previously demonstrated that nitrosative stress is increased in diabetic rats with periodontitis. Nitrosative stress induces poly(ADP-ribose) polymerase (PARP) activation. Here, we demonstrated the involvement of PARP activation in diabetic periodontitis and detailed the therapeutic effects of PARP inhibitor. MATERIALS AND METHODS: Experimental periodontitis was induced by placing a nylon thread ligature. Half of the normal and diabetic rats received the PARP inhibitor, 1,5-isoquinolinediol, for 2 weeks. Gingival PARP activation was detected by immunostaining for poly(ADP-ribose). Periodontitis was evaluated by gingival inflammatory cell infiltration, inflammatory gene expressions and micro-CT analyses. RESULTS: Although both periodontitis and the presence of diabetes increased PARP activation in the gingiva, diabetic rats with periodontitis had the highest activation of PARP. Diabetic rats with periodontitis also showed significant increases in monocyte/macrophage invasion into the gingiva, inflammatory gene expressions, nitrotyrosine-positive cells in the gingiva and alveolar bone loss, all of which were suppressed by treatment with the PARP inhibitor. CONCLUSIONS: These results indicate the involvement of PARP activation in the pathogenesis and aggravation of periodontal disease in diabetes and suggest the therapeutic potential of PARP inhibition for treating periodontal disease, especially in patients with diabetes.

DWI as an Imaging Biomarker for Bladder Cancer.

OBJECTIVE: DWI has been increasingly applied in the management of bladder cancer. In this article, we discuss the role of DWI as an imaging biomarker for bladder cancer. CONCLUSION: The DWI signal is derived from the motion of water molecules, which represents the physiologic characteristics of the tissue of interest. The emerging evidence highlights the utility of DWI for bladder cancer detection and characterization. DWI is a potentially useful tool to individualize treatment strategies.

Serum Amyloid A Promotes E-Selectin Expression via Toll-Like Receptor 2 in Human Aortic Endothelial Cells.

Periodontitis is a chronic inflammatory disease that affects the periodontium. Recent studies suggest an association between periodontal and cardiovascular diseases. However, the detailed molecular mechanism is unknown. A previous study has demonstrated that experimental periodontitis induces serum amyloid A (SAA) in the liver and peripheral blood of ApoE-deficient mice as an atherosclerosis model. SAA is an acute-phase protein that affects systemic inflammation. The aim of this study is to investigate the atherosclerosis-onset mechanism using human aortic endothelial cells (HAECs) stimulated by SAA in vitro. Atherosclerosis PCR array and qPCR analyses showed upregulation of adhesion molecules such as intercellular adhesion molecule-1, vascular cell adhesion molecule-1, and E-selectin in HAECs upon SAA stimulation. In addition, the results demonstrated that Toll-like receptor, TLR2, could serve as an important receptor of SAA in HAECs. Furthermore, small interfering RNA (siRNA) against TLR2 inhibited the upregulation of adhesion molecules in HAECs stimulated by SAA. Our results suggest that SAA stimulates the expression of adhesion molecules via TLR2. SAA could be an important molecule for atherosclerosis induced by periodontal disease.