Risk factors for anastomotic leak and postoperative morbidity after right hemicolectomy for colon cancer: results from a prospective, multi-centre, snapshot study in China.

BACKGROUND: Right hemicolectomy is the standard treatment for right-sided colon cancer. There is variation in the technical aspects of performing right hemicolectomy as well as in short-term outcomes. It is therefore necessary to explore best clinical practice following right hemicolectomy in expert centres. METHODS: This snapshot study of right hemicolectomy for colon cancer in China was a prospective, multicentre cohort study in which 52 tertiary hospitals participated. Eligible patients with stage I-III right-sided colon cancer who underwent elective right hemicolectomy were consecutively enrolled in all centres over 10 months. The primary endpoint was the incidence of postoperative 30-day anastomotic leak. RESULTS: Of the 1854 patients, 89.9 per cent underwent laparoscopic surgery and 52.3 per cent underwent D3 lymph node dissection. The overall 30-day morbidity and mortality were 11.7 and 0.2 per cent, respectively. The 30-day anastomotic leak rate was 1.4 per cent. In multivariate analysis, ASA grade > II (P < 0.001), intraoperative blood loss > 50 ml (P = 0.044) and D3 lymph node dissection (P = 0.008) were identified as independent risk factors for postoperative morbidity. Extracorporeal side-to-side anastomosis (P = 0.031), intraoperative blood loss > 50 ml (P = 0.004) and neoadjuvant chemotherapy (P = 0.004) were identified as independent risk factors for anastomotic leak. CONCLUSION: In high-volume expert centres in China, laparoscopic resection with D3 lymph node dissection was performed in most patients with right-sided colon cancer, and overall postoperative morbidity and mortality was low. Further studies are needed to explore the optimal technique for right hemicolectomy in order to improve outcomes further.

Rapid and facile detection of largemouth bass ranavirus with CRISPR/Cas13a.

Largemouth bass ranavirus (LMBV) is an epidemic disease that seriously jeopardizes the culture of largemouth bass（Micropterus salmoides）, and it has a very high incidence in largemouth bass. Once an outbreak occurs, it may directly lead to the failure of the culture, resulting in substantial economic losses, but there is no effective vaccine or special effective drug yet. Consequently, it is important to establish an accurate, sensitive, convenient and specific detection approach for preventing LMBV infection. The recombinant enzyme-assisted amplification (RAA) technology was used in combination with clustered regularly interspaced short palindromic repeats (CRISPR), and associated protein 13a (CRISPR/Cas13a) to detect LMBV. We designed RAA primers and CRISPR RNA (crRNA) that targeted the conserved region in the LMBV main capsid protein (MCP) gene, amplified sample nucleic acids using the RAA technology, performed CRISPR/Cas13a fluorescence detection and evaluated the sensitivity and specificity of the established method with qPCR as a control method. This technique was able to determine the results by collecting fluorescence signals, visualizing fluorescence by UV excitation and combining with lateral flow strips (LFS). The sensitivity and specificity of the established method were consistent with the qPCR method. Besides, it was performed at a constant temperature of 37 °C and the sensitivity of the reaction system was 3.1 × 101 copies/µL, with no cross-reactivity with other common aquatic pathogens. Further, the positive detection rate of the proposed method in 32 clinical samples was consistent with that of qPCR. In conclusion, our established RAA-CRISPR/Cas13 method for detecting LMBV is sensitive, simple and specific, which is applicable in the rapid on-site detection and epidemiological monitoring of LMBV.

The lncRNA20718-miR6022-RLPs module regulates tomato resistance to Phytophthora infestans.

KEY MESSAGE: Sl-lncRNA20718 acts as an eTM of Sl-miR6022 regulating its expression thereby affecting SlRLP6/10 expression. SlRLP6/10 regulate PRs expression, ROS accumulation, and JA/ET content thereby affecting tomato resistance to P. infestans. Tomato (Solanum lycopersicum) is an important horticultural and cash crop whose yield and quality can be severely affected by Phytophthora infestans (P. infestans). Long non-coding RNAs (lncRNAs) and microRNAs (miRNAs) are widely involved in plant defense responses against pathogens. The involvement of Sl-lncRNA20718 and Sl-miR6022 in tomato resistance to P. infestans as well as the targeting of Sl-miR6022 to receptor-like protein genes (RLPs) were predicted in our previous study. However, uncertainty exists regarding their potential interaction as well as the molecular processes regulating tomato resistance. Here, we found that Sl-lncRNA20718 and Sl-miR6022 are positive and negative regulators of tomato resistance to P. infestans by gain- and loss-of-function experiments, respectively. Overexpression of Sl-lncRNA20718 decreased the expression of Sl-miR6022, induced the expression of PRs, reduced the diameter of lesions (DOLs), thereby enhanced disease resistance. A six-point mutation in the binding region of Sl-lncRNA20718 to Sl-miR6022 disabled the interaction, indicating that Sl-lncRNA20718 acts as an endogenous target mimic (eTM) of Sl-miR6022. We demonstrated that Sl-miR6022 cleaves SlRLP6/10. Overexpression of Sl-miR6022 decreases the expression levels of SlRLP6/10, induces the accumulation of reactive oxygen species (ROS) and reduces the content of JA and ET, thus inhibiting tomato resistance to P. infestans. In conclusion, our study provides detailed information on the lncRNA20718-miR6022-RLPs module regulating tomato resistance to P. infestans by affecting the expression of disease resistance-related genes, the accumulation of ROS and the phytohormone levels, providing a new reference for tomato disease resistance breeding.

Clinical evaluation of autonomous robotic-assisted full-arch implant surgery: A 1-year prospective clinical study.

OBJECTIVES: This prospective clinical study aimed to evaluate the accuracy and 1-year clinical follow-up performance of dental implant placement with an autonomous dental implant robot (ADIR) system in full-arch implant surgery. MATERIALS AND METHODS: Twelve patients with edentulous arches or final dentition received 102 implants using the ADIR system. Global platform deviation, global apex deviation, and global angular deviation between the planned and actual implants were calculated after surgery. Data were statistically analyzed for factors including jaws, implant positions, patient sequences, implant systems, and implant length. Surgery duration was recorded. Patients were followed for 3 months and 1 year after surgery. Periodontal parameters, buccal bone thickness (BBT), and facial vertical bone wall peak (IP-FC) were recorded. RESULTS: Among the 102 implants, the mean (SD) global platform deviation, global apex deviation, and global angular deviation were 0.53 (0.19) mm, 0.58 (0.17) mm, and 1.83 (0.82)°, respectively. The deviation differences between the mandible and maxilla did not show statistical significance (p > .05). No statistically significant differences were found for the jaws, implant positions, patient sequences, implant systems, and implant length to the deviations (p > .05). The periodontal parameters, the BBT, and IP-FC remained stable during 1-year follow-up. CONCLUSION: The ADIR system showed excellent positional accuracy. The 1-year follow-up after full-arch implant surgery indicated that the ADIR system could achieve promising clinical performance. Additional clinical evidence is requisite to furnish guidelines for the implementation of the ADIR system in full-arch implant surgery.

Intracorporeal versus extracorporeal anastomosis in laparoscopic right hemicolectomy for overweight colon cancer patients: a case-control study.

INTRODUCTION: Either extracorporeal anastomosis (EA) or intracorporeal anastomosis (IA) could be selected for digestive reconstruction in laparoscopic right hemicolectomy (LRH). However, whether LRH with IA is feasible and beneficial for overweight right-side colon cancer (RCC) is unclear. This study aims to investigate the feasibility and advantage of IA in LRH for overweight RCC. METHODS: Forty-eight consecutive overweight RCC patients undergoing LRH with IA were matched with 48 consecutive cases undergoing LRH with EA. Both clinical and surgical data were collected and analyzed. RESULTS: The incidence of postoperative complications was 20.8% (10/48) in the EA group and 14.6% (7/48) in the IA group respectively, with no statistical difference. Compared to the EA group, patients in the IA group revealed faster gas (40.2 + 7.8 h vs. 45.6 + 7.9 h, P = 0.001) and stool discharge (4.0 + 1.2 d vs. 4.5 + 1.1 d, P = 0.040), shorter assisted incision (5.3 + 1.3 cm vs. 7.5 + 1.2 cm, P = 0.000), and less analgesic used (3.3 + 1.3 d vs. 4.0 + 1.3 d, P = 0.012). There were no significant differences in operation time, blood loss, or postoperative hospital stays. In the IA group, the first one third of cases presented longer operation time (228.4 + 29.3 min) compared to the middle (191.0 + 35.0 min, P = 0.003) and the last one third of patients (182.2 + 20.7 min, P = 0.000). CONCLUSION: LRH with IA is feasible and safe for overweight RCC, with faster bowel function recovery and less pain. Accumulation of certain cases of LRH with IA will facilitate surgical procedures and reduce operation time.

Accuracy of implant placement using CAD-CAM tooth-supported surgical guides for an auricular prosthesis in vitro.

PURPOSE: To evaluate the accuracy of tooth-supported surgical guides used to place implants in auricular prostheses. The accuracy (trueness and precision) of the implant positions was evaluated, and the difference between the surgical guide with and without retention of the external auditory canal (EAC) was compared. MATERIALS AND METHODS: This study simulated implant placement in vitro for the treatment of right auricle malformation. Surgical guides and other casts were fabricated using additive manufacturing technology. The casts were divided into 2 groups according to the surgical guide, with 10 bone blocks in each group (with or without the EAC plug (Guides 1 and 2)). Three implant positions (Implants 1-3) were prepared for each bone block using surgical guides. Implant positions were registered using light-body silicone impressions combined with optical surface scans to measure the coronal, apical, depth, and angular deviations. Four deviations of trueness and precision were reported as the mean ± standard deviation, which was analyzed by Student's t-test. RESULTS: Each group of 10 bone blocks with 30 implant positions was successfully prepared and digitally reproduced as implants. The accuracies of implant position with surgical guides were acceptable when compared with the preoperatively planned implant positions. Compared with the Guide 2 group, there was a significant difference in the apical, depth, and angular deviations of Guide 1 group in terms of precision (p = 0.001). There was a significant difference in the depth deviation of Implant 1 (p = 0.028) and apical deviation of Implant 2 (p < 0.001) compared two groups in terms of trueness. In terms of precision, there was a significant difference in the coronal (p = 0.002), apical (p = 0.001), and depth (p < 0.001) deviation of Implant 1; apical (p = 0.036) and angular (p < 0.001) deviation of Implant 2 also existed significant difference; the coronal deviation of Implant 3 (p = 0.018) also existed significant difference. Moreover, the group with the EAC plug showed lower deviation in precision and a smaller volume in the 95% confidence ellipsoid. CONCLUSION: Both types of tooth-supported surgical guides can provide acceptable accuracy. A surgical guide with an EAC plug was considered to be more precise.

Enantioselective direct vinylogous Michael addition for constructing enantioenriched γ,γ-dialkyl substituted butyrolactams and octahydroindoles.

A nickel(II)-catalyzed asymmetric direct vinylogous Michael addition of γ-alkyl monosubstituted α,ß-unsaturated butyrolactams to α,ß-unsaturated carbonyl compounds has been disclosed, affording γ,γ-dialkyl substituted butyrolactams in good yields and satisfactory enantioselectivities. A tandem catalytic asymmetric vinylogous Michael addition/intramolecular Michael addition has also been developed based on this reaction, which enabled the construction of enantioenriched octahydroindoles with three consecutive stereogenic carbon centers.

Effects of different intensities of intermittent pneumatic soft-tissue compression on bone defect repair.

BACKGROUND: To estimate the effects of different intensities of intermittent pneumatic soft-tissue compression on bone defect repair in an animal model. METHODS: Five mm radial bone defect in length was made in 64 mature New Zealand rabbits and all animals randomly assigned into four groups: Group A (control group without compression), Group B (5-7 kPa intensity), Group C (8-10 kPa intensity) and Group D (11-13 kPa intensity). On the fourth day after surgery, their legs were intermittently pneumatic compressed for 4 weeks. The stimulation lasted 30 min every day and the frequency of compression was 15 Hz. New bone formation in 4 groups was evaluated by gross observation, X-ray, Micro-CT, and histological staining at 2 and 4 weeks after surgery. RESULT: There was more new bony callus in the bone defect in group C than in other groups by gross observation and X-ray radiography at 2 and 4 weeks. The Micro-CT results showed more new bony callus, bone trabecula and higher bone mineral density in group C. Fluorescent labeling results showed the speed of new bone formation in Group C was faster than that in other groups, among which the control group had the slowest speed of new bone formation. The result of histology had shown that the trabeculae in bone callus in group C had a regular form, the trabeculae were wide and had a more become osteoblast around them. CONCLUSION: The intermittent pneumatic soft-tissue compression can accelerate new bone formation of bone defects and the optimal intensity is 8-10 kPa for repairing the rabbit radial bone defect.

Fully digital workflow for the rehabilitation of a total nasal defect with a prosthesis.

For a patient with a total nasal defect, an esthetic prosthesis remains the optimal choice for enhancing quality of life. This technique describes a fully digital workflow for designing virtual patterns and negative molds for a nasal prosthesis. This fully digital workflow facilitated the provision of an esthetic prosthesis.

Fully digital workflow for ear defect rehabilitation with an immediate implant-retained auricular prosthesis.

The fully digital workflow for an immediate implant-retained auricular prosthesis procedure included computer-aided treatment planning, flapless surgery, and the prefabricated auricular prosthesis rehabilitation. This technique also encompassed the presurgery fabrication of the substructure of the implants and the definitive auricular prosthesis to ensure the smooth insertion of the ear prosthesis.

Digital workflow for auricular prosthesis fabrication with a negative mold.

A prosthesis for a patient with a complete auricle defect can be fabricated with computer-aided design and computer-aided manufacturing, significantly reducing the number of patient visits and improving the efficiency of the production process. This technique provides a digital workflow for designing virtual patterns and negative molds for an auricular prosthesis.

Effect of Denonvilliers' Fascia Preservation Versus Resection During Laparoscopic Total Mesorectal Excision on Postoperative Urogenital Function of Male Rectal Cancer Patients: Initial Results of Chinese PUF-01 Randomized Clinical Trial.

OBJECTIVE: To compare the outcomes of laparoscopic total mesorectal excision (L-TME) with Denonvilliers' fascia (DVF) preservation versus resection on urogenital function of male patients with rectal cancer. BACKGROUND: The protective effect of DVF during L-TME on pelvic autonomic nerves and postoperative urogenital function remains controversial. METHODS: Between August 26, 2015 and July 18, 2019, 253 male patients with cT1-4 (T1-2 for anterior wall) N0-2M0 rectal cancer from 11 institutions were enrolled, and randomly assigned to L-TME with DVF preservation (Exp-group, n = 123) or resection procedures (Con-group, n = 130). Urinary function was assessed by residual urine volume, maximal flow rate, and International Prostate Symptom Score; sexual function was assessed by 5-item version of the International Index of Erectile Function (IIEF-5) and ejaculation grading. RESULTS: The Exp-group patients showed a lower urinary dysfunction rate (6.8% vs 25.4%, P = 0.003), higher maximal flow rate (16.25 ±â€Š8.02 vs 12.40 ±â€Š7.05 mL/s, P = 0.007), and lower International Prostate Symptom Score (6.55 ±â€Š5.86 vs 8.57 ±â€Š5.85, P = 0.026) than the Con-group patients at 2 weeks after surgery. The incidence of erectile dysfunction (IIEF-5 ≤ 11) at 12 months after surgery was lower in the Exp-group than in the Con-group (12.5% vs 34.2%, P = 0.023); Exp-group manifested superior IIEF-5 (16.63 ±â€Š6.28 vs 12.26 ±â€Š6.83, P = 0.018). The incidence of ejaculation dysfunction was lower in the Exp-group than in the Con-group at 12 months after surgery (10.0% vs 29.4%, P = 0.034). CONCLUSIONS: DVF preservation during L-TME revealed protective effects on postoperative urogenital function, and could be a better choice for male rectal cancer patients with specific staging and location. TRIAL REGISTRATION NUMBER: NCT02435758.

TIGIT promotes CD8+T cells exhaustion and predicts poor prognosis of colorectal cancer.

TIGIT is a lymphocyte surface receptor, which is mainly expressed on the surface of CD8+T cells. The role of TIGIT in colorectal cancer and its expression pattern in colorectal cancer infiltrating lymphocytes are still controversial. This study aimed at identifying the function of TIGIT in colorectal cancer. Patients with colorectal cancer showed significantly higher TIGIT+CD8+T cell infiltration in tumor tissues, metastases compared with paired PBMC and normal tissues through flow cytometry. TIGIT+CD8+T cells showed an exhausted phenotype and expressed low levels of killer cytokines IFN-γ, IL-2, TNF-α. In addition, more inhibitory receptors such as PD-1, LAG-3, and TIM-3 were expressed on the surface of TIGIT+CD8+T cells. TGF-ß1 could promote the expression of TIGIT and inhibit CD8+T cell function in vitro. Moreover, the accumulation of TIGIT+T cells in tumors was associated with advanced disease, predicted early recurrence, and reduced survival rates in colorectal cancer patients. Our results indicate that TIGIT can be a biological marker for the prognosis of colorectal cancer, and TIGIT can be used as a potential target for treatment.

Asymmetric synthesis of 9-alkyl tetrahydroxanthenones via tandem asymmetric Michael/cyclization promoted by chiral phosphoric acid.

A tandem asymmetric Michael-addition/cyclization of cyclic 1,3-dicarbonyl compounds to ß,γ-unsaturated α-ketoesters catalyzed by chiral phosphoric acid is presented. This protocol provides a facile approach for the construction of enantioenriched 9-alkyl tetrahydroxanthenones, an ubiquitous framework found in a number of natural products and pharmaceutical molecules, in high yields with good to high enantioselectivities.

Laparoscopic colorectal resection combined with simultaneous thermal ablation or surgical resection of liver metastasis: a retrospective comparative study.

Objective: Colorectal liver metastasis is a critical cause of mortality. However, the safety and long-term prognosis of simultaneous colorectal tumor resection along with hepatic lesion ablation are debated. The current analysis was conducted to further clarify the controversy.Methods: In this retrospective study, we collected data of 68 patients who underwent ablation or resection for liver lesions combined with simultaneous laparoscopic primary colorectal tumor resection between September 2011 and October 2016 at the Third Affiliated Hospital of Sun Yat-sen University. Perioperative outcomes and long-term follow-up data were compared between patients in the resection and ablation groups.Results: Both groups had similar surgical duration (286.70 ± 78.33 vs. 313.67 ± 80.90 min), conversion rate (2 vs. 0), total expenses (81.51 ± 20.20 vs. 82.21 ± 27.81 kRMB, p = .914) and morbidities (11 vs. 24, p = .667). However, the postoperative hospital stays (12.82 ± 9.25 vs. 8.40 ± 2.38 d) and transfusion rates (56.52% vs. 8.89%) were significantly lower in the ablation group. The long-term overall survival (p = .714), disease-free survival (p = .680) and intra-hepatic recurrent-free survival (p = .496) were comparable between both groups.Conclusion: With respect to simultaneous treatment for both primary colorectal cancer and liver metastasis, hepatic lesion ablation was associated with lower blood loss and hospital stay duration than liver resection, without compromising the surgical safety and long-term prognosis.

Preoperative mechanical bowel preparation with oral antibiotics reduces surgical site infection after elective colorectal surgery for malignancies: results of a propensity matching analysis.

BACKGROUND: Surgical site infections (SSIs) are a major postoperative complication after colorectal surgery. Current study aims to evaluate prophylactic function of oral antibiotic (OA) intake in combination with mechanical bowel preparation (MBP) relative to MBP alone with respect to postoperative SSI incidence. METHODS: A retrospective analysis of eligible patients was conducted using the databases of the Gastrointestinal Surgery Centre, Third Affiliated Hospital of Sun Yat-sen University from 2011 to 2017. Data pertaining to postoperative hospital stay length, expenses, SSI incidence, anastomotic fistula incidence, and rates of other complications were extracted and compared. A propensity analysis was conducted to minimize bias associated with demographic characteristics. Subgroup analyses were performed to further explore protective effects of OA in different surgical sites. RESULTS: The combination of OAs and MBP was related to a significant decrease in the incidence of overall SSIs, superficial SSI, and hospitalization expenses. The MBP + OA modality was particularly beneficial for patients undergoing left-side colon or rectum resections, with clear prophylactic efficacy. The combination of MPB + OA did not exhibit significant prophylactic efficacy in patients undergoing right hemi-colon resection. Age, surgical duration, and application of OA were all independent factors associated with the occurrence of SSIs. CONCLUSION: These results suggest that the combination of OA + MBP should be recommended for patients undergoing elective colorectal surgery, particularly for operations on the left side of the colon or rectum. TRIAL REGISTRATION: NCT04258098. Retrospectively registered.

RSPO2 enhances cell invasion and migration via the WNT/ß-catenin pathway in human gastric cancer.

R-spondins comprise a group of secreted WNT agonists. R-spondin2 (RSPO2) plays a crucial role in the activation of the WNT/ß-catenin pathway and oncogenesis, though its specific role in human gastric cancer (GC) remains unclear. In the current study, RSPO2 expression levels were upregulated in cancer specimens and cell lines (AGS and BGC-823). Inhibition of RSPO2 expression levels had distinct effects on cell invasion, migration, and epithelial-mesenchymal transition (EMT) in AGS and BGC-823 cells in vitro. Furthermore, RSPO2 positively correlated with leucine-rich repeat-containing G-protein-coupled receptor 5 (LGR5), the receptor of RSPO2. Silencing RSPO2 reduced the expression of LGR5 and WNT/ß-catenin effector molecule ß-catenin together with downstream targets TCF-4 and Cyclin-D1. These observations demonstrate that upregulation of RSPO2 in GC specimens and cell lines is closely related to tumor invasion and migration and that RSPO2 promotes EMT in gastric cancer cells by activating WNT/ß-catenin signaling.

Neuroprotection of Andrographolide Against Microglia-Mediated Inflammatory Injury and Oxidative Damage in PC12 Neurons.

Andrographolide from leaves of Andrographis paniculata has been known to possess various bioactivities. In the present study, we aimed to explore the neuroprotection of andrographolide against inflammation-mediated injury and oxidative damage. In initial studies, our findings showed that pretreatment with andrographolide could effectively reduce neuronal cell death caused by LPS-induced conditioned supernatants. The further results indicated that this neuroprotective effect may be mainly due to the inhibition on the production of NO, TNF-α, IL-6, ROS, iNOS and enhancement of expression of anti-inflammatory marker CD206. Moreover, mechanism study revealed that the anti-inflammatory activity of andrographolide may be related to the suppression of nuclear translocation of NF-κB as well as the activation of Nrf2 and HO-1. Our study also showed that andrographolide could scavenge ROS and protect PC12 cells against H2O2- and 6-OHDA-mediated oxidative damage. In addition, several derivatives of andrographolide were prepared for evaluating the role of 3, 14, 19-hydroxy group on anti-inflammatory effect and cytoprotection of andrographolide. In conclusion, andrographolide protected neurons against inflammation-mediated injury via NF-κB inhibition and Nrf2/HO-1 activation and resisted oxidative damage via inhibiting ROS production. Our results will contribute to further exploration of the therapeutic potential of andrographolide in relation to neuroinflammation and neurodegenerative diseases.

Reconsideration of the Anterior Surgical Plane of Total Mesorectal Excision for Rectal Cancer.

INTRODUCTION: Previous studies on total mesorectal excision suggested dissection anterior to Denonvilliers' fascia, which might lead to intraoperative pelvic autonomic nerves injury and a high incidence of urogenital dysfunction. TECHNIQUE: We dissected 4 cases of cadavers, mainly focusing on anatomy of Denonvilliers' fascia, to study the relationship between Denonvilliers' fascia and rectum. In practice, instead of dissection 1 cm above peritoneal reflection, dissection of the peritoneum was performed at the lowest level of peritoneal reflection during laparoscopic resection for mid-low rectal cancer. RESULTS: The cadaveric study revealed that there were loose tissues between Denonvilliers' fascia and rectal specimen, thus a surgical plane posterior to Denonvilliers' fascia did exist. During laparoscopic resection for mid-low rectal cancer, some loose reticulate structures between Denonvilliers' fascia and proper fascia of rectum would present after dissection of peritoneum at the lowest level of peritoneal reflection. Then dissection within the surgical plane posterior to Denonvilliers' fascia became easy and feasible. In this plane, both the pelvic nerves and postoperative urogenital function could be well protected by Denonvilliers' fascia. CONCLUSIONS: The anterior surgical plane for total mesorectal excision should be reconsidered, and dissection posterior to Denonvilliers' fascia is feasible and practicable for patients without risk of positive anterior circumferential resection margin.

A thiol-inducible and quick-response DNA cross-linking agent.

Three new 2,4-dinitrobenzenesulfonyl derivatives 1-3 were successfully prepared for the first time using a simple process. They were efficiently triggered by thiols (glutathione and l-cysteine) to release the corresponding phenol derivatives (4-6) within 5 min. The quick response of 1-3 toward thiols was determined by 1H NMR and HPLC. Moreover, our results indicated that 1 could induce DNA cross-linking in the presence of glutathione, probably due to the quinone methide formation of phenol intermediate 4 followed by departure of 2,4-dinitrobenzenesulfonyl group.