Correlation Between Expression of Orotate Phosphoribosyl Transferase and 5-Fluorouracil Sensitivity, as Measured by Apoptosis Index in Colorectal Cancer Tissue

[Effect of topical injection of cyclosporine A on saliva secretion and inflammation in the submandibular gland of non-obese diabetic mice]

OBJECTIVE

To investigate the effects of topical administration of cyclosporine A (CsA) on salivary secretion and inflammation of the submandibular glands in non-obese diabetic (NOD) mice.

METHODS

Female NOD mice, 21 aged 14 weeks and 18 aged 21 weeks were selected and randomly divided into low-dose group, high-dose group and control group on average. CsA was injected into submandibular glands. One week later the saliva stimulated by pilocarpine was collected and measured. The submandibular glands were collected to make paraffin sections. The lymphocyte infiltration in submandi-bular gland was observed by microscope after hematoxylin-eosin (HE) staining. The number of lymphocyte infiltration foci was counted to calculate the focus sore and the ratio of lymphocyte infiltration area to total gland area was figured up by Leica image analysis system. The expressions of inflammatory cytokines tumor necrosis factor-α (TNF-α), interferon-γ (IFN-γ), interleukin-4 (IL-4), IL-13, IL-17F, IL22 and IL-23a in the submandibular glands of the NOD mice were detected by quantitative real-time polymerase chain reaction (qRT-PCR). Cell apoptosis in the submandibular gland was detected by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL). The levels of serum creatinine (Scr), blood urea nitrogen (BUN), uric acid (UA), alanine aminotransferase (ALT), aspertate aminotransferase (AST), alkaline phosphatase (ALP), albumin (ALB) and γ-glutamyl transferase (GGT) were measured by automatic biochemical analyzer to evaluate liver and kidney functions.

RESULTS

After topical injection of CsA in the submandibular gland, the stimulated salivary flow rate of the 14- and 21-week-old NOD mice significantly increased compared with the control group (P < 0.01 or P < 0.05), and the number and area of lymphocyte infiltration foci in the 14-week-old NOD mice low-dose group significantly decreased compared with the control group (P < 0.01). Low and high dose of CsA had similar effects on reducing inflammation and improving salivary secretion. The overall level of inflammatory cytokines in the submandibular gland did not decrease significantly. The number of cell apoptosis of submandibular gland in the NOD mice treated with CsA decreased compared with the control group, but there was no statistically significant difference. Topical injection of CsA had no adverse effect on liver and kidney function in the NOD mice.

CONCLUSION

Topical injection of CsA can reduce lymphocyte infiltration in submandibular gland of NOD mice and improve salivary secretion.

The predictive value of genes of the TGF-beta1 pathway in multimodally treated squamous cell carcinoma of the esophagus

BACKGROUND AND AIM

Pretherapeutic identification of esophageal squamous cell carcinomas (ESCCs) that are likely to respond to neoadjuvant chemoradiotherapy is important in the attempt to improve the prognosis for patients. In the present study, expression of members of the transforming growth factor-beta1 (TGF-beta1) signaling pathway was investigated in pretherapeutic biopsies from 97 ESCCs (cT3, cN0/+, cM0) in patients who underwent neoadjuvant chemoradiotherapy (45 Gy plus cisplatin and 5-fluorouracil) and subsequent esophagectomy in the setting of a single-center prospective treatment trial.

MATERIALS AND METHODS

Expression of TGF-beta1 and its downstream effectors Smad4 and Smad7 was assessed using quantitative reverse transcription polymerase chain reaction from RNA prepared from pretherapeutic tumor biopsies. The presence of phosphorylated Smad2 was assessed immunohistochemically.

RESULTS

Expression of TGF-beta1 (mean 7.8; range 0.0-25.7 arb. units), Smad4 (mean 0.1; range 0.0-0.4 arb. units), and Smad7 (mean 1.6; range 0.4-16.1 arb. units) varied substantially between the patients. Tumors with total or subtotal regression, as determined by histopathological examination after neoadjuvant chemoradiotherapy, showed significantly higher levels of Smad4 mRNA expression than tumors with minor or no regression (P = 0.032). TGF-beta1 and Smad7 mRNA expression as well as Smad2 protein expression were of no prognostic value. Expression of the four genes under analysis also showed no impact on the overall survival. In contrast, the overall survival correlated significantly with histopathological regression (P < 0.0001) and to a minor degree also with clinical regression grading (P = 0.0254).

INTERPRETATION

Among the parameters analyzed, only Smad4 was found to have possible predictive value for esophageal squamous cell carcinoma in patients receiving neoadjuvant chemoradiotherapy.