Periodontal bone defects, primarily caused by periodontitis, are highly prevalent in clinical settings and manifest as bone fenestration, dehiscence, or attachment loss, presenting a significant challenge to oral health. In regenerative medicine, harnessing developmental principles for tissue repair offers promising therapeutic potential. Of particular interest is the condensation of progenitor cells, an essential event in organogenesis that has inspired clinically effective cell aggregation approaches in dental regeneration. However, the precise cellular coordination mechanisms during condensation and regeneration remain elusive. Here, taking the tooth as a model organ, we employed single-cell RNA sequencing to dissect the cellular composition and heterogeneity of human dental follicle and dental papilla, revealing a distinct Platelet-derived growth factor receptor alpha (PDGFRA) mesenchymal stem/stromal cell (MSC) population with remarkable odontogenic potential. Interestingly, a reciprocal paracrine interaction between PDGFRA⁺ dental follicle stem cells (DFSCs) and CD31⁺ Endomucin⁺ endothelial cells (ECs) was mediated by Vascular endothelial growth factor A (VEGFA) and Platelet-derived growth factor subunit BB (PDGFBB). This crosstalk not only maintains the functionality of PDGFRA⁺ DFSCs but also drives specialized angiogenesis. In vivo periodontal bone regeneration experiments further reveal that communication between PDGFRA⁺ DFSC aggregates and recipient ECs is essential for effective angiogenic-osteogenic coupling and rapid tissue repair. Collectively, our results unravel the importance of MSC-EC crosstalk mediated by the VEGFA and PDGFBB-PDGFRA reciprocal signaling in orchestrating angiogenesis and osteogenesis. These findings not only establish a framework for deciphering and promoting periodontal bone regeneration in potential clinical applications but also offer insights for future therapeutic strategies in dental or broader regenerative medicine.
Receptor, Platelet-Derived Growth Factor alpha/metabolism* ; Humans ; Neovascularization, Physiologic/physiology* ; Dental Sac/cytology* ; Single-Cell Analysis ; Transcriptome ; Mesenchymal Stem Cells/metabolism* ; Bone Regeneration ; Animals ; Dental Papilla/cytology* ; Periodontium/physiology* ; Stem Cells/metabolism* ; Regeneration ; Angiogenesis

Objective To investigate the clinical efficacy of arthroscopic simple repair technique and en-hanced repair technique in the treatment of chronic lateral ankle instability(CLAI).Methods Forty-one cases of CLAI treated in the General Hospital of Northern Theater Command of PLA from January 2018 to January 2019 were selected and conducted arthroscopic lateral ankle ligament repair or enhanced repair treatment.The follow up data in 39 cases were complete.Among them,18 cases conducted the anterior talofibular ligament repair with wire anchor under arthroscopy and were included in the repair group,while 21 cases conducted the arthroscopic enhanced repair with linear anchors and knots free anchors and were included in the enhanced re-pair group.The postoperative follow up lasted for 12 months.The VAS score and AOFAS ankle-hind foot score before operation and in postoperative,3,6,12 months were compared between the two groups.The effi-cacies of treating CLAI by the two operation modes were evaluated.Results The preoperative VAS score and AOFAS ankle-hind foot score had no statistical differences between the two groups(P＞0.05).The VAS score at postoperative time points had no statistical difference between the enhanced repair group and repair group(P＞0.05).The AOFAS ankle-hind foot score in the enhanced repair group was higher than that in the repair group,and the difference was statistically significant(P＜0.05).No serious complications occurred in the grouped patients during the follow up period.Conclusion In terms of pain and ankle function,the effect of arthroscopic enhanced repair in treating CLAI is better than that of simple repair.

Mitochondrial myopathy is a group of multi-system diseases in which mitochondrial DNA(mtDNA)or nuclear DNA(nDNA)defects lead to structural and functional dysfunction of mitochondria.The clinical manifestations of mitochondrial myopathy are complex and varied,and the testing for mtDNA and nDNA is not widely available,so misdiagnosis or missed diagnosis is common.Chronic progressive external ophthalmoplegia(CPEO)is a common type of mitochondrial myopathy,which is characterized by blepharoptosis.Here we report a 38-year-old female with mitochondrial myopathy presented with chronic numbness and weakness of the limbs,accompanied by blepharoptosis that was recently noticed.Laboratory and head magnetic resonance imaging(MRI)examinations showed no obvious abnormalities.Muscle and nerve biopsies showed characteristic ragged red fibers(RRFs)and large aggregates of denatured mitochondria.Testing for mtDNA and nDNA showed a known mutation c.2857C＞T(p.R953C)and a novel variant c.2391G＞C(p.M797I)in the polymerase gamma(POLG)gene,so the patient was diagnosed as mitochondrial myopathy.Clinicians should pay more attention to long-term unexplained skeletal muscle diseases with recent onset blepharoptosis.Histopathologic examination and genetic testing are of great value in the early diagnosis and therapeutic intervention.

Objective To analyze the clinical efficacy and toxic reaction of Tegafur,Gimeraciland Oteracil Potassium Capsule combined with Gemcitabine chemotherapy for patients with radical resection for advanced gallbladder carcinoma.Methods The clinical dataof 135 patients with advanced gallbladder cancer who were admitted to the 1 st Affiliated Hospital of Zhengzhou University and supported after the gastrectomy by the pathology from June 2007 to June 2012 were retrospectively analyzed.All patients were divided into three groups by different therapeutic regimens,operation groups (Radical resection or Extended radical resection of gallbladder carcinoma) with 47 cases,chemotherapy A group (Tegafur,Gimeracil and Oteracil Potassium Capsule combined with Gemcitabine chemotherapy after Radical resection or Extended radical resection of gallbladder carcinoma) with 52 cases,and chemotherapy B group (5-Fluorouracil combined with Oxaliplatin chemotherapy after Radical resection or Extended radical resection of gallbladder carcinoma) with 36 cases.We collected the dates of all patients with the median survival time and the 1,3 and 5-year survival rate after operation,and counted the rate of major toxic reaction after chemotherapy.Results There were no significant differences in the general date of three groups (sex,age,tumor size,CA19-9,CA125,TNM stages,with or without cholecystolithiasis,operation methods,operation complication),The chemotherapy A group and chemotherapy B group had no differenceswiththe median survival time and 1,3 and 5-year survival rate after operation.There were significant differences in the median survival time and 3,5-year survival rate after operation between the operation group and chemotherapy A group (or between the operation group and chemotherapy B group).There were significant differences in the rate of whole toxic reaction and the rate of toxic reaction beyond Ⅲ degree between chemotherapy A group and chemotherapy B group.Conclusions The treatment of Tegafur,Gimeracil and Oteracil Potassium Capsule combined with Gemcitabine chemotherapy for patients with radical resection of advanced gallbladder carcinoma has a lower rate of whole toxic reaction and rate of toxic reaction beyond Ⅲ degree than 5-Fluorouracil combined with Oxaliplatin chemotherapy,and for patients with advanced gallbladder carcinoma,the frontal treatment can obviously prolong the median survival time and effectively improve the 3 and 5-year survival rate after operation.

BACKGROUND:Toxic cytarabine is often used to prepare highly purified neurons in experimental studies addressing central nervous system diseases. However, the intervention time of cytarabine is little reported. OBJECTIVE:To determine the optimal intervention time of cytarabine(final concentration 10μmol/L) in primary culture of rat cortical neurons. METHODS:Rat primary cortical neurons were cultured in Neurobasal+B27 medium, and 10μmol/L cytarabine were added at 12, 24, 36 and 48 hours after culture, respectively. Half of the medium were changed every 48 hours. The morphology of neurons was observed under inverted microscope at 7 days. The purity and differentiation of neurons maturity were identified by immunocytochemistry method of neuron specific enolization enzyme staining. Morphometric analysis for all neuron-specific enolase positive cells was performed by Multifunction Computer Image Analysis System. RESULTS AND CONCLUSION:After addition of cytarabine at 24 hours of culture, the purity of neurons was more than 90%, well-differentiated cortical neurons accounted for 89.00%, and the area of neuronal body was the largest with the longest synapses. There were more neuron cells with transparent cytoplasm, and large nucleus. The cell body had good refraction and strong stereo sense. The neurons with 3-4 synapses and 3-4 bifurcates formed a good network structure. These results illustrate that although it willbe beneficial for the purity of neurons to add cytarabine early in neuron culture process, it will make obvious effect on neuronal differentiation. The highly purified and well-grown cerebral cortical neurons will be obtained after cultured in neurolbasal medium, which cytarabine is added to at 24 hours of culture.