Objective To investigate the effects of the nerve, endocrine, and immune factors on the process of wound healing and regeneration of the skin after injury and to review the research work in the past years in this area. Methods The prospective study was made to explore the relationship among the nerve, endocrine, immune factors, and skin tissue repair and regeneration, and to summarize the recent advance in this area. Results The nerve, endocrine, and immune factors played an important role in the repair and generation of the skin after injury. Conclusion As there has been fewer studies made in this field, we should reinforce the related basic research in this field.
Objective To introduce the related issues in the clinical translational application of adipose-derived stem cells (ASCs). Methods The latest papers were extensively reviewed, concerning the issues of ASCs production, management, transportation, use, and safety during clinical application. Results ASCs, as a new member of adult stem cells family, bring to wide application prospect in the field of regenerative medicine. Over 40 clinical trials using ASCs conducted in 15 countries have been registered on the website (http://www.clinicaltrials.gov) of the National Institutes of Health (NIH), suggesting that ASCs represents a promising approach to future cell-based therapies. In the clinical translational application, the related issues included the quality control standard that management and production should follow, the prevention measures of pathogenic microorganism pollution, the requirements of enzymes and related reagent in separation process, possible effect of donor site, age, and sex in sampling, low temperature storage, product transportation, and safety. Conclusion ASCs have the advantage of clinical translational application, much attention should be paid to these issues in clinical application to accelerate the clinical translation process.
Objective To review the regulating effects of estrogen on endothel ial cell functions, the involved endothel ial progenitor cells (EPCs), and the related VEGF, and explore the mechanism of estrogen participating in new vesselformation on wound basement and wound heal ing. Methods Recent l iterature about biological effects of estrogen oncapillary vessel formation was reviewed. Results The formation of new vessel in the wound’s granulation tissue contained vasculogenesis and vascularization, and the new vessels could transport the oxygen and nutrient for the metabol ism of the local heal ing tissue. The estrogen effected vascular endothel ial cells through its receptors. Peripheral vascular EPCs differentiated into endothel ial cells and participated into the formation of new vessels. Estradiol exerted influences on the dynamics of vascular EPCs and the neovascularization. VEGF was a key mediator in the processes of estradiol regulating angiogenesis. Conclusion Understanding the molecular mechanisms that regulate vessel formation in wound heal ing, especially how estrogen modulates its receptor and angiogenic factor, may provide new approaches for managing wound heal ing.
Objective To study the relationship between the adipose tissues and cutaneous morphogenesis on wound healing. Methods Adipose tissues’ participation in regulation of food intake, energy expenditure, fuel metabolism, and a variety of other physiological processes was reviewed in the latest literature. The wound healing was regulated by endocrine, paracrine, and adipocytederived molecules. Results Several factors secreted by adipose tissues (leptin, cytokines, growth factors, lipids, metallothioneins, ect) regulated wound healing. Conclusion Adipose tissues may play a vital role in the process of wound healing. Further understanding of the complex interaction between adipose cells and cutaneous morphogenesis is essential to explore the mechanism of wound healing.
Objective To review the current condition of growth factors and their application to clinical treatment of acute and chronic wounds. Methods Data from the literature and Medline were analyzed according to their different uses in acute and chronic wounds. Their potential side-effects were studied. Results All data showed that wound healing time in acute and chronic wounds was accelerated and wound healing quality was improved after treatment with growth factors. No sideeffect was observed. Conclusion The efficacy and safety of growth factors in improving wound healing were confirmed. However, some reconsideration aboutpotential problems of growth factors must be made to apply them clinically in the future.
Objective To investigate the effect of hydrochloric propranolol cream and its possible mechanism on wound healing in diabetic mice. Methods Eighteen 8-week-old BKS.Cg-Dock7m+/+Leprdb/JNju diabetic mice were randomly divided into control group (n=9) and experimental group (n=9). After full-thickness dermal wounds (0.6 cm in diameter) was made, wounds were treated with cream containing hydrochloric propranolol (experimental group) or not containing hydrochloric propranolol (control group) at 2, 5, 7, 10, 14, and 17 days. At 2, 5, 7, 10, 14, 17, and 21 days, wound healing was observed, and healing rate was calculated; HE staining, Masson staining, and toluidine blue staining were used to observe wound re-epithelialization, collagen fibers, and mast cells distribution. Western blot was applied to detect the expressions of interleukin 1β (IL-1β) and angiogenin 2 (Ang2) in wound tissue. Results Wounds healed in 2 groups, but the wounds healing rate of experimental group was significantly higher than that of control group at other time points (P < 0.05) except 21 days (P > 0.05). The histological observation showed that re-epithelialization rate was higher in experimental group than control group, there were less mast cells in the wound. The experimental group was lower than control group in IL-1β expression at 2, 5, 7, 14, 17, and 21 days and in Ang2 expression at 2, 5, 7, 10, 14, 17, and 21 days. Conclusion Hydrochloric propranolol cream can promote wound healing in diabetic mice, which potential mechanism is that propranolol can promote epidermal cell proliferation, reduce inflammation, and benefit angiogenesis.
ObjectiveTo investigate the technique of optimizing the location of femoral attachment in medial patellofemoral ligament (MPFL) reconstruction assisted with arthroscopy and evaluate the effectiveness.MethodsBetween January 2014 and September 2018, 35 patients with patellar dislocation were admitted. There were 14 males and 21 females with an average age of 22.6 years (range, 16-38 years). All patients had a history of knee sprain. The disease duration ranged from 1 to 7 days (mean, 2.8 days). Patellar dislocation occurred 2-4 times (mean, 2.5 times). The preoperative Lysholm score and Kujala score were 47.60±11.24 and 48.37±9.79, respectively. The patellar congruence angle was (31.40±6.81)°, the patellar tilt angle was (29.95±5.44)°, the lateral patellofemoral angle was (−11.46±5.18)°, and the tibial tubercle-trochlear groove distance was (16.66±1.28) mm. All patients were treated by MPFL reconstruction with the semitendinosus tendon under arthroscopy. During operation, the suture anchors were inserted into the midpoint and the 1/3 point of superomedial edge of the patella. Then, the femoral tunnels were created in medial femoral condyle through limited excision. For tendon fixation, the Kirschner wires were inserted into adductor tubercle, medial epicondyle of femur, and the midpoint between the two points, as well as the anteriorly and posteriorly. Afterwards, the changes of ligament length and tension, patellar tracking, and the relationship of patella and femoral trochlea were evaluated, thereby determining the optimized femoral attachment for MPFL reconstruction. Finally, the patellar congruence angle, patellar tilt angle, and lateral patellofemoral angle were measured by imaging to assess the relationship of patella and femoral trochlea. Moreover, Lysholm score and Kujala score were used to evaluate the knee joint function.ResultsAll incisions healed by first intention without infection. All patients were followed up 12-18 months (mean, 15.4 months). At 12 months, the Lysholm score was 94.40±3.99 and the Kujala score was 92.28±4.13, which were significant higher than those before operation (P<0.05). No patellar dislocation occurred during follow-up. At 12 months, the patellar congruence angle was (6.57±4.59)°, the patellar tilt angle was (9.73±2.82)°, the lateral patellofemoral angle was (7.14±4.63)°, which were superior to those before operation (P<0.05).ConclusionDuring the MPFL reconstruction under arthroscopy, a higher positioning accuracy for the femoral attachment and satisfactory effectiveness can be obtained by evaluating MPFL length and tension, patellofemoral joint kinematics, and patellar tracking.
Objective In vivo, the microenvironment of epidermal stem cells (ESCs) is complex, and estrogen might be involved in the micro environment. To investigate the biological effects of estrogen on the prol iferation and migration of ESCs in vitro. Methods hESCs were isolated from normal human foreskin and cultured. The second generation of hESCs were identified with flow cytometry after being marked with integrin β1, cytokeratin 19 (CK19), CK14, and CK10 antigens.hESCs of 2 × 106 cell density were cultured with ESCs special medium supplemented with 0.1 nmol/L Diethylstilbestrol in group A (estrogen group), with ESCs special medium supplemented with 10 nmol/L Raloxifene hydrochloride in group B (ER blocking agent group), and with ESCs special medium in group C (control group), respectively. The 100 μm “scratch” wounds were created by scraping confluent hESCs plated on Petri dishes with a sterile pipette tip in vitro. The migrating cells from the wound edge were quantified at 24, 48, and 72 hours after incubation. The rates of wound heal ing were calculated by SigmaScan Pro 5.0 software at 72 hours. The prol iferating effect of estrogen on hESCs was determined with MTT method at 24, 48, 72, 96, and 120 hours. Results Cultured primary hESCs could adhere to the wall showing ovoid in shape and grew into colonies. Flow cytometry showed the positive results for integrin β1, CK19, and CK14 (with positive rate of 96.63%, 95.47%, and 94.27%, respectively) and the negative result for CK10 (with positive rate of 1.32%). In group A, the number of cells crossing the wound edge was more than those of group B and group C at 24, 48, and 72 hours. The rates of wound heal ing were 69.00% ± 0.05% in group A, 35.00% ± 0.05% in group B, and 48.00% ± 0.06% in group C at 72 hours, showing significant differences among groups (P lt; 0.05). The prol iferating speed of hESCs was significantly higher in group A than in groups B and C (P lt; 0.01), and significantly higher in group C than in group B (P lt; 0.01) at 24, 48, 72, 96, and 120 hours. Conclusion The estrogen can promote the prol iferation and migration of hESCs in vitro. It may be involved in many biological activity of skin.