A Comparison of the Reliability of the Patellar Tendon-Trochlear Groove (PTTG) Distance and the Tibial Tuberosity-Trochlear Groove (TTTG) Distance Measured on MRI

@#Introduction: An increased tibial tuberosity-trochlear groove (TTTG) distance is used for deciding a treatment plan in patello-femoral instability (PFI). The centre of the patellar tendon and the chondral trochlear groove can be directly visualised on MRI, and measured, giving the patellar tendontrochlear groove (PTTG) distance. A study was designed to compare the inter-rater and the test-retest reliabilities of PTTG and TTTG measurements in MRI of patients without PFI and in a group with PFI. Materials and Methods:This cross-sectional reliability study was done on archival MRI films of 50 patients without patellar instability and 20 patients with patellar instability. TTTG and PTTG distances were independently measured by two orthopaedic surgeons and two radiologists. A hybrid PTTG measurement with bony landmarks on the femoral side and the patellar tendon landmark on the tibial side, was used to estimate the influence of the differences in the femoral and tibial landmarks on the difference in reliabilities. The intra-class correlation coefficient (ICC) was calculated for all four raters, as well as separately for each rater. Results: The PTTG distance had a higher inter-rater reliability (ICC=0.86, 95% CI=0.79-0.92) compared to the TTTG distance (ICC=0.70, 95% CI=0.59-0.80) in patients without PFI. Similar trends were seen in patients with PFI (0.83 vs 0.66). The inter-rater reliability for the hybrid PTTG distance was found to lie in between the TTTG and PTTG. Conclusions:The MRI-based PTTG distance had better inter-rater reliability compared with the MRI-based TTTG distance.

Study of major genetic factors involved in pituitary tumorigenesis and their impact on clinical and biological characteristics of sporadic somatotropinomas and non-functioning pituitary adenomas

Genetic and functional aberrations of guanine nucleotide-binding protein, alpha stimulating (GNAS), aryl hydrocarbon receptor interacting protein (AIP), and pituitary tumor transforming gene (PTTG) are among the most prominent events in pituitary tumorigenesis. A cohort of Brazilian patients with somatotropinomas (n=41) and non-functioning pituitary adenomas (NFPA, n=21) from a single tertiary-referral center were evaluated for GNAS and AIP mutations and gene expression of AIP and PTTG. Results were compared to the clinical and biological (Ki67 and p53 expression) characteristics of tumors and their response to therapy, if applicable. Genetic analysis revealed that 27% of somatotropinomas and 4.8% of NFPA harbored GNAS mutations (P=0.05). However, no differences were observed in clinical characteristics, tumor extension, response to somatostatin analog therapy, hormonal/surgical remission rates, Ki67 index, and p53 expression between mutated and non-mutated somatotropinomas patients. PTTG overexpression (RQ mean=10.6, min=4.39, max=11.9) and AIP underexpression (RQ mean=0.56, min=0.46-max=0.92) were found in virtually all cases without a statistically significant relationship with clinical and biological tumor features. No patients exhibited somatic or germline pathogenic AIP mutations. In conclusion, mutations in GNAS and abnormal PTTG and AIP expression had no impact on tumor features and treatment outcomes in this cohort. Our data support some previous studies and point to the need for further investigations, probably involving epigenetic and transcriptome analysis, to improve our understanding of pituitary tumor behavior.

MiRNA-374 Inhibits Glioma Cell Growth, Invasion Via Direct Targeting Pituitary Tumor Transforming Gene / 中山大学学报(医学科学版)

[Objective] To investigate the possible effect of microRNA-374 (miR-374) expression on tumor cells' proliferation and invasion and particular mechanism.[Methods] MiR-374 overexpression lentiviral vector (Lv-miR-374) and a control lentiviral empty vector (LEV) were stably transfected into human glioma U251 and U87 cells,to evaluate the effect of miR-374 on cell proliferation and invasion ability.Target relationship between miR-374 and PTTG were researched by dual luciferase report gene assay.Expression level of correlative signaling pathways of the downstream gene protein was analyzed by Western blot.[Results] We revealed that the overexpression of miR-374 dramatically suppressed glioma cell growth and invasion in vitro.Target relationship between miR-374 and PTTG was confirmed by dual luciferase report gene assay.And decreased protein expression of PTTG,bFGF,AKT,MMP2,and p70S6K was consistent with the effect of miR-374 overexpression.[Conclusion] Decreased miRNA-374 is an unfavorable prognosis marker and promotes glioma cell growth and invasion via direct targeting PTTG.Our findings provide new insights into the role of miR-374 in the development of gliomas,and implicate the potential application of miR-374 in cancer therapy.

The expression of PTTG,VEGF-C and LMVD in laryngeal carcinoma and the relationship among them / 重庆医学

Objective To investigate the expression of PTTG and VEGF-C in laryngeal carcinoma and the effect of angiogene-sis .Methods Immunohistochemistry was used to detect the expression of PTTG 、VEGF-C and LMVD in 60 cases of laryngeal car-cinoma and 32 cases of para-carcinoma tissue .D2 40 positive products was used to locate lymphatic endothelial cell cytoplasm and cell membrane ,and count lymphatic microvessel density (LMVD) .Results The expression of PTTG and VEGF-C in laryngeal car-cinoma was significantly higher than that in para-carcinoma tissue(P0 .05) .The expression of LMVD in laryngeal carcinoma was significantly higher than that in para-carcinoma tissue(P0 .05) .A significantly positive relation was found between PTTG and VEGF-C(P<0 .05) .And there were positive relation between PTTG and LMVD、VEGF-C and LMVD(P<0 .05) .Conclusion PTTG and VEGF-C might play an important role in the carcino-genesis and development of laryngeal carcinoma .PTTG and VEGF-C could be a prognostic factor of colorectal cancer and a new tar-get of gene therapy .

Effect of PTTG1 in the invasion of glioma cells / 中国癌症杂志

Background and purpose:Numerous researches indicated that the expression of pituitary tumor transforming gene1 (PTTG1) was correlated with the severity of glioma tumors. However the specific mechanism of PTTG1 is not clear in glioma. In this study, we explored the role and significance of PTTG1 in the invasion of glioma cells. Methods:Western blot was used to detect the expression of PTTG1 protein in various glioma cell lines. siRNA plasmid was used to transfect U87 cells. Western blot was used to analyze the expression of PTTG1 protein in transfected U87 cells. Matrigel invasion assay was used to detect the invasive ability in the cells being transfected in vitro. Western blot was used to analyze epithelial growth factor (EGF) induced protein phosphorylation of ARK5 and Akt in the cells being transfected PTTG1 plasmid (siPTTG1/U87) and scrambled siRNA (Scr/U87). Results:The expression of PTTG1 protein was higher in all glioma cell lines. After transfection, the invasion of siPTTG1/U87 was obviously decreased after 5 min with EGF stimulation than the Scr/U87, the phosphorylation of ARK5 and Akt was significantly enhanced. However, whether or not the existence of EGF, the phosphorylation of ARK5 and Akt had no differences in siPTTG1/U87. Conclusion:In glioma cells, PTTG1 protein is high expressed and maybe have an important function in glioma cells invasion through Akt-ARK5 signaling pathway.

Expression and significance of PTTG and Ki67 in fibroadenomatosis and fibroadenomas / 中华内分泌外科杂志

Objective To explore the relationship between pituitary tumor transforming gene(PTIG) and Ki67 expression and their significance in multiple adolescent breast fibroadenomas (fibroadenomatosis)and single persons(fibroadenomas) and their clinical value.Methods A total of 53 fibroadenomatosis and 160 fibroadenomas specimens in our hospital were collected.All the samples were fixed with 10％ formalin and then embedded with paraffin.The protein expression of PTTG and Ki67 was detected by immunohistochemical staining.The relation between expression of PTTG and Ki67 in fibroadenomatosis was analyzed.Results The positive rate of PTTG and Ki67 was higher in fibroadenomatosis than in fibroadenomas (P ＜ 0.005).Conclusions High expression of PTTG and Ki67 in fibroadenomatosis leads to the proliferation of tumor cell and upregulates tumor angiogenesis.High expression of PTTG and Ki67 may play important roles in tumorigenesis and pathological process of fibroadenomatosis.

RNAi-mediated knockdown of pituitary tumor- transforming gene-1 (PTTG1) suppresses the proliferation and invasive potential of PC3 human prostate cancer cells

Pituitary tumor-transforming gene-1 (PTTG1) is a proto-oncogene that promotes tumorigenesis and metastasis in numerous cell types and is overexpressed in a variety of human tumors. We have demonstrated that PTTG1 expression was up-regulated in both human prostate cancer specimens and prostate cancer cell lines. For a more direct assessment of the function of PTTG1 in prostate tumorigenesis, RNAi-mediated knockdown was used to selectively decrease PTTG1 expression in PC3 human prostate tumor cells. After three weeks of selection, colonies stably transfected with PTTG1-targeted RNAi (the knockdown PC3 cell line) or empty vector (the control PC3 cell line) were selected and expanded to investigate the role of PTTG1 expression in PC3 cell growth and invasion. Cell proliferation rate was significantly slower (28%) in the PTTG1 knockdown line after 6 days of growth as indicated by an MTT cell viability assay (P < 0.05). Similarly, a soft agar colony formation assay revealed significantly fewer (66.7%) PTTG1 knockdown PC3 cell colonies than control colonies after three weeks of growth. In addition, PTTG1 knockdown resulted in cell cycle arrest at G1 as indicated by fluorescence-activated cell sorting. The PTTG1 knockdown PC3 cell line also exhibited significantly reduced migration through Matrigel in a transwell assay of invasive potential, and down-regulation of PTTG1 could lead to increased sensitivity of these prostate cancer cells to a commonly used anticancer drug, taxol. Thus, PTTG1 expression is crucial for PC3 cell proliferation and invasion, and could be a promising new target for prostate cancer therapy.

Expression of Anaphase Promoting Complex (APC) and APC Regulatory Proteins in Invasive Ductal Carcinoma Associated with Paget's Disease

BACKGROUND: Oncogene expression in Paget's disease of the breast is not well known. To characterize invasive ductal carcinoma associated with Paget's disease, we studied expression of anaphase promoting complex (APC) with its regulatory proteins. METHODS: Immunohistochemical stainings were done with 10 cases of invasive ductal carcinoma associated with Paget's disease for APC, pituitary tumor transforming gene (PTTG), cyclin B1, p53, cyclin D1, and c-erbB-2. The expressions of these markers in Paget's disease were compared with those in the associated with carcinoma. RESULTS: APC, PTTG, cyclin B1, and c-erbB-2 were positive in all of the cases with both Paget's disease and underlying carcinoma. p53 was expressed in Paget's disease of 6 cases (60%) and in carcinoma of 7 cases (70%). Cyclin D1 was positive in Paget's disease of 8 cases (80%) and in carcinoma of 9 cases (90%). CONCLUSIONS: Breast carcinomas with Paget's disease seem to be distinguished by the high expression of APC, cyclin B1, PTTG, c-erbB2, and cyclin D1 in contrast to breast cancers without Paget's disease. Furthermore, the similar expression patterns of APC and APC regulatory proteins in both Paget's disease and underlying breast cancer support the epidermotropic theory as its pathogenetic mechanism.

PTTG, ESP1 expression in S, G_2/M phases in A549, SPC-A-1 cell lines / 第三军医大学学报

Objective To observe the pituitary tumor transforming gene (PTTG), estradiol-stimulated protein 1 (ESP1) expressions in S, G 2/M phases in A549, SPC-A-1 cell lines. Methods The mammalian cells for cell cycle was synchronizated by thymidine, the total RNA in the S, G 2/M phases was collected, and the total RNA was observed by Real-time PCR. Results PTTG expression in A549 and SPC-A-1 cell lines was higher in S phase than that in G 2/M phase while no PTTG expression in MRC-5 cells in S, G 2/M phases. ESP1 expression in A549, SPC-A-1, MRC-5 cell lines was lower in S phase than that in G 2/M phase. Conclusion That no PTTG in S and G 2/M phases in the normal cell line and PTTG expression in the lung cancer cell line higher in S phase than that in G 2/M phase suggested that the aneuploidy may be caused by the overexpression of PTTG. ESP1 expression was lower in S phase than G 2/M phase in all of the three cell lines, suggesting that sister chromatids separation depend on the active ESP1.

Effect of PTTG on the growth and fluorouracil sensitivity of cholangiocarcinoma cell Line QBC939 / 中国普通外科杂志

Objective To investigate the effct of PTTG gene on the growth and sensitivity to 5-FU of cholangiocarcinoma cell.Methods The pcDNA3.1-PTTGas that contained full-length antisense PTTG,and pcDNA3.1(+) was transfected into the cholangiocarcinoma cell line QBC939.We successfully established and identified cell sublines tQBC939(PTTG-),tQBC939(pcDNA3.1).Cell growth curve was mapped out,cell proliferation rate was assessed by MTT assay and cell cycle percentage was counted by flow cytometry.After treatment with 5-FU,cell survival rate was assessed by MTT assay and IC50 was calculated.Flow cytometry and Hoechst staining were used to demonstrate discrepancy of cell apoptosis rates.Results Compared with other two groups,tQBC939(PTTG-) grew more rapidly and had a higher proportion of cells in S phase,whereas less cells in G2/M phase(P

Expression of pituritary tumor transforming gene and basic fibroblast growth factor in oral squamous cell carcinoma and related clinical importance / 实用口腔医学杂志

Objective: To investigate the expression of pituitary tumor transforming gene (PTTG) and basic fibroblast growth factor (bFGF) in oral squamous cell carcinoma and their relation with each other, as well as the relationship of their expression with clinical-pathological indexes. Methods: The expression of PTTG and bFGF were examined among 55 oral squamous cell carcinoma tissues and 10 normal oral mucosal tissues by the streptavidin-biotinperoxidase (S-P) method. Results:The positive rate of PTTG and bFGF was 78.2% and 67.3% respectively in oral squamous cell carcinoma. The positive rate and grade of PTTG and bFGF were significantly higher than that in the normal mucosa tissues (P

Study of the expression and correlation of PTTG and VEGF in human extrahepatic cholangiocarcinoma / 中国普通外科杂志

Objective To investigate the correlation of the expressions of PTTG and VEGF proteins in extrahepatic cholangiocarcinoma,and study its role in the development of extrahepatic cholangiocarcinoma.Methods Expression of PTTG and VEGF proteins was detected by SABC immunohistochemical technique in 36 cases of extrahepatic cholangiocarcinoma,30 cases of adjacent histologically noncancerous bile duct tissues and 12 cases of benign bile duct lesions.Results The positive rates of PTTG and VEGF proteins were(72.2)%(26/36) and 83.3%(30/36) respectively,in extrahepatic cholangiocarcinoma;and 63.3%(19/30) and 76.7%(23/30) in adjacent histologically noncancerous bile duct tissues.The expression of PTTG protein was significantly positively correlated with that of VEGF protein(P