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Plant grafting:Molecular mechanisms and applications

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Molecular Plant 2024年第1期17卷 75-91页

作者： Ming Feng Frauke Augstein Abdul Kareem Charles W.Melnyk Department of Plant Biology Linnean Center for Plant BiologySwedish University of Agricultural SciencesAlmas allé575651 UppsalaSweden

People have grafted plants since antiquity for propagation,to increase yields,and to improve stress *** cutting and joining of tissues activates an incredible regenerative ability as different plants fuse and grow as *** over a hundred years,people have studied the scientific basis for how plants ***,new techniques and a deepening knowledge of the molecular basis for graft formation have allowed a range of previously ungraftable combinations to ***,we review recent developments in our understanding of graft formation,including the attachment and vascular formation *** analyze why plants graft and how biotic and abiotic factors influence successful *** also discuss the ability and inability of plants to graft,and how grafting has transformed both horticulture and fundamental plant *** our knowledge about plant grafting improves,new combinations and techniques will emerge to allow an expanded use of grafting for horticultural applications and to address fundamental research questions.

关键词： plant grafting regeneration mobile molecules tissue adhesion vascular differentiation stress tolerance

Antibacterial conductive self-healable supramolecular hydrogel dressing for infected motional wound healing

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Science China Chemistry 2022年第11期65卷 2238-2251页

作者： Rui Yu Zhenlong Li Guoying Pan Baolin Guo Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi'an 710049China State Key Laboratory for Mechanical Behavior of Materials Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi'an710049China

Wounds on stretchable parts of the human body cause prolonged suffering and involve more severe healing processes than wounds on stationary parts. However, they have received insufficient attention compared with other types of chronic wounds. In this study, a novel supramolecular gelatin(GT) hydrogel composed of GT-graft-aniline tetramer and quaternized chitosan was presented. The hydrogel was crosslinked by monoaldehyde β-cyclodextrin via host-guest interaction and dynamic Schiff base and was free from permanent covalent bonds, heavy metals, and oxidants. Given its dynamic feature, the hydrogel exhibited flexibility, self-healing, and tissue adhesiveness and well adapted to motion wounds. Moreover, the hydrogel was bioactive with conductivity, antioxidant property, hemostatic effect, antibacterial, and photothermal effect(the killing ratio for methicillinresistant Staphylococcus aureus(MRSA) was higher than 99.8% after 5 min of near-infrared irradiation) and exhibited ondemand removability. In the full-thickness MRSA-infected motional wound healing experiment, this novel hydrogel exhibited a significantly enhanced wound healing efficacy with a fast wound closure ratio(about 99.0% for 14 days), mild inflammatory response, high level of collagen deposition, and enhanced re-epithelialization by downregulating interleukin-6 and CD68 and upregulating vascular endothelial growth factor. The results indicated that this hydrogel has great potential in wound healing and skin tissue engineering and serves as an inspiration for the design of supramolecular biomaterials.

关键词： supramolecular hydrogel self-healing tissue adhesion joint wound

Natural polymer-based adhesive hydrogel for biomedical applications

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Biosurface and Biotribology 2022年第2期8卷 69-94页

作者： Siyu Long Chaoming Xie Xiong Lu Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengduChina Yibin Research Institute Southwest Jiaotong UniversityYibinChina

Hydrogel is a polymer network system that can form a hydrophilic three-dimensional network structure through different cross-linking *** recent years,hydrogels have received considerable attention due to their good biocompatibility and biodegradability by introducing different cross-linking mechanisms and functional *** with synthetic hydrogels,natural polymer-based hydrogels have low biotoxicity,high cell affinity,and great potential for biomedical fields;however,their mechanical properties and tissue adhesion capabilities have been unable to meet clinical *** recent years,many efforts have been made to solve these *** this review,the recent progress in the field of natural polymer-based adhesive hydrogels is *** authors first introduce the general design principles for the natural polymer-based adhesive hydrogels being used as excellent tissue adhesives and the challenges associated with their ***,their usages in biomedical applications are summarised,such as wound healing,haemostasis,nerve repair,bone tissue repair,cartilage tissue repair,electronic devices,and other tissue ***,the potential challenges of natural polymer-based adhesive hydrogels are presented.

关键词： biomedical applications design principles mechanical properties natural polymer-based adhesive hydrogels tissue adhesion

Benefits of laparoscopy-assisted ileostomy in colorectal cancer patients with bowel obstruction

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世界临床病例杂志 2023年第24期11卷 5660-5665页

作者： Yi-Jie Wang Kuan-Hsun Lin Jung-Cheng Kang Je-Ming Hu Chao-Yang Chen Ta-Wei Pu Department of Surgery Tri Service General HospitalNational Defense Medical CenterTaipei 114Taiwan Division of Thoracic Surgery Department of SurgeryTri-Service General HospitalNational Defense Medical CenterTaipei 114Taiwan Division of Colon and Rectal Surgery Department of SurgeryTaiwan Adventist HospitalTaipei 105Taiwan Division of Colon and Rectal Surgery Department of SurgeryTri-Service General HospitalNational Defense Medical CenterTaipei 114Taiwan Division of Colon and Rectal Surgery Department of SurgerySongshan branchTri-Service General HospitalNational Defense Medical CenterTaipei 105Taiwan

BACKGROUND Ileostomies are commonly performed after colon and rectal ***-assisted ileostomy with adhesion lysis may have potential benefits over conventional open *** To compare the outcomes of laparoscopy-assisted and conventional *** Data from 48 consecutive patients who underwent ileostomy at our institution between May 2021 and May 2022 were retrospectively *** groups comprised 26 and 22 patients who underwent laparoscopic ileostomy(laparoscopic group)and conventional ileostomy(conventional group),respectively,performed by a single *** demographics,operative characteristics,postoperative outcomes,and 30-d morbidities and mortality rates were *** The two groups had comparable mean ages,sex distributions,American Society of Anesthesiologists scores,and body mass ***,the laparoscopic group showed similar operative time,better visualization for adhesion lysis,and lower visual analog scale scores than the conventional *** Laparoscopy-assisted ileostomy is a safe and efficient method that produces lower visual analog scale scores,better intraoperative visualization for effective adhesion lysis,and similar operative time compared with conventional ileostomy.

关键词： Laparoscopy Ileostomy Colorectal cancer Bowel obstruction tissue adhesion Retrospective study

Cutting performance of surgical electrodes by constructing bionic microstriped structures

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Frontiers of Mechanical Engineering 2023年第1期18卷 163-178页

作者： Kaikai LI Longsheng LU Huaping CHEN Guoxiang JIANG Huanwen DING Min YU Yingxi XIE School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510641China Testing and Technology Center for Industrial Products of Shenzhen Customs District Shenzhen 518067China South China University of Technology School of Medicine Guangzhou 510006China Department of Orthopaedics Guangzhou First People’s HospitalGuangzhou 510180China Department of General Surgery Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China

Surgical electrodes rely on thermal effect of high-frequency current and are a widely used medical tool for cutting and coagulating biological ***,tissue adhesion on the electrode surface and thermal injury to adjacent tissue are serious problems in surgery that can affect cutting performance.A bionic microstriped structure mimicking a banana leaf was constructed on the electrode via nanosecond laser surface texturing,followed by silanization treatment,to enhance *** effect of initial,simple grid-textured,and bionic electrodes with different wettabilities on tissue adhesion and thermal injury were investigated using horizontal and vertical cutting *** showed that the bionic electrode with high lyophobicity can effectively reduce tissue adhesion mass and thermal injury depth/area compared with the initial *** formation mechanism of adhered tissue was discussed in terms of morphological features,and the potential mechanism for antiadhesion and heat dissipation of the bionic electrode was ***,we evaluated the influence of groove depth on tissue adhesion and thermal injury and then verified the antiadhesion stability of the bionic *** study demonstrates a promising approach for improving the cutting performance of surgical electrodes.

关键词： surgical electrodes tissue adhesion thermal injury bionic structures cutting performance medical tools

Breathable,stretchable and adhesive nanofibrous hydrogels as wound dressing materials

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Engineered Regeneration 2021年第1期2卷 63-69页

作者： Xueting Liu Yumin Liu Jingtao Du Xiaoran Li Jianyong Yu Bin Ding State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of TextilesDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 200051China

In spite of the great progress of wound healing materials,the development of dressing with moisture permeabil-ity,stretchable capability,and adhesive performance remains a huge *** this study,gelatin-dopamine(GT-DA)nanofiber membrane was prepared by introducing dopamine(DA)into gelatin(GT)via electrospinning followed by in-situ *** effects of DA dosage,crosslinking condition and crosslinking time on the mechanical properties of the fiber membrane were studied *** resultant GT-DA nanofibrous hydrogels exhibited integrated stress strength of 1.96 MPa,good water absorption of 700%,and water vapor transmission(WVT:4.3 kg m^(-2)d^(-1)),which were superior than those of Mepiform■,a commercial adhesive silicone *** addition,Fe^(3+)were introduced into one side of the nanofiber membrane.A stronger adhesion strength of 2.5 KPa on the porcine skin,which was 1.6 times higher than that of Mepiform■was *** research showed that the prepared nanofibrous hydrogel has potential as wound dressing and could be used in post-traumatic tissue healing *** work presented a type of breathable,stretchable and adhesive nanofibrous hydrogels,which would ensure the stable attachment on wounds during movement as a wound healing material.

关键词： Nanofibrous hydrogels Dopamine tissue adhesion Stretchable properties Wound dressing materials

natural polymer-based bilayer adhesive skin substitute for infected burned wound healing

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Bioactive Materials 2023年第11期 177-195页

作者： Mina Shahriari-Khalaji Mamoona Sattar Ran Cao Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China Research Group of Microbiological Engineering and Medical Materials College of Biological Science and Medical EngineeringDonghua UniversityShanghai201620China Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine Donghua UniversityShanghai201620China

Thermal wounds are complex and lethal with irregular shapes, risk of infection, slow healing, and large surface area. The mortality rate in patients with infected burns is twice that of non-infected burns. Developing multifunctional skin substitutes to augment the healing rate of infected burns is vital. Herein, we 3D printed a hydrogel scaffold comprising carboxymethyl chitosan (CMCs) and oxidized alginate grafted catechol (O-AlgCat) on a hydrophobic electrospun layer, forming a bilayer skin substitute (BSS). The functional layer (FL) was fabricated by physiochemical crosslinking to ensure favorable biodegradability. The gallium-containing hydrophobic electrospun layer or backing layer (BL) could mimic the epidermis of skin, avoiding fluid penetration and offering antibacterial activity. 3D printed FL contains catechol, gallium, and biologically active platelet rich fibrin (PRF) to adhere to both tissue and BL, show antibacterial activity, encourage angiogenesis, cell growth, and migration. The fabricated bioactive BSS exhibited noticeable adhesive properties (P ≤ 0.05), significant antibacterial activity (P ≤ 0.05), faster clot formation, and the potential to promote proliferation (P ≤ 0.05) and migration (P ≤ 0.05) of L929 cells. Furthermore, the angiogenesis was significantly higher (P ≤ 0.05) when evaluated in vivo and in ovo. The BSS-covered wounds healed faster due to low inflammation and high collagen density. Based on the obtained results, the fabricated bioactive BSS could be an effective treatment for infected burn wounds.

关键词： Infected burn wound Bioactive skin substitute Double cross-linked Anti-inflammation tissue adhesion