Objective To establish a rat model of venous thrombosis in a plateau hypobaric hypoxic environment and to investigate the effect of this environment on venous thrombosis.Methods A total of 144 healthy male SD rats were assigned randomly to four groups(n=36 rats per group):a plains sham operation(A)group,plains operation(B)group,plateau altitude 6000 m+sham operation(C)group,and plateau altitude 6000 m+surgery(D)group.Rats in A and B groups were maintained in a plains normoxic environment,while rats in C and D groups C and D were subjected to a plateau environment.Rats in the surgical groups underwent quantitative constriction to incompletely obstruct the inferior vena cava blood flow.Each group was further divided into subgroups based on time:1,3,5,7,14,and 21 d(n=6 rats per group).Regular vascular ultrasound monitoring was conducted,and blood samples were taken for whole blood viscosity testing and the assessment of inflammatory indicators,including endothelin-1(ET-1),interleukin-6(IL-6)and tissue factor(TF).Coagulation function was evaluated through the activated partial thromboplastin time(APTT),prothrombin time(PT),thrombin time(TT),fibrinogen(FIB)and D-dimer.After the observation period,the experimental animals were sacrificed and the limbs were removed.Thrombus samples were stained with hematoxylin/eosin(HE),and the thrombus wet mass was measured.Results The thrombosis incidence was significantly higher in the plateau D group than in B group,accompanied by a marked increase in blood viscosity and hematocrit(P＜0.01).Additionally,levels of ET-1,IL-6,and TF were significantly elevated(P＜0.05),indicating a coagulation disorder.Conclusions A plateau hypoxic environment model can be successfully simulated by quantitative coarctation of the inferior vena cava,combined with a specialized environmental chamber.The findings of this study suggest that a plateau hypoxic environment promotes venous thrombosis.

Objective:To address the critical issue of missing dynamic border molding information in edentulous direct digital impression technology, this study explores innovative digital solutions and conducts preliminary application validation.Methods:Based on the myostatic line theory, a methodology was established: intraoral scanner (IOS) high-frequency video was utilized to dynamically capture functional molding data of soft tissues, integrated with a self-developed mobility gradient recognition algorithm to achieve dynamic threshold segmentation between the muscle dynamic zone and myostatic zone, termed "optical digital molding technology". Ten edentulous patients with well-fitting complete dentures, treated at the Department of Prosthodontics, Peking University School and Hospital of Stomatology from January 2024 to December 2024, were enrolled. The standard deviation between the muscle static line (generated by mobility gradient algorithm with thresholds of 0.3-0.7 mm) and the denture border curve was analyzed to optimize the dynamic threshold, followed by single-case clinical validation.Results:Among the mobility thresholds of 0.3-0.7 mm, the 0.5 mm threshold yielded the smallest standard deviation between the myostatic line and denture border. Clinical validation demonstrated that dentures designed with this threshold exhibited no displacement during dynamic functional tests, with marginal sealing meeting clinical standards.Conclusions:The optical digital border molding technique for edentulous soft tissue boundaries translates the myostatic line theory into quantifiable parameters for the first time. Based on data from 10 cases, a mobility threshold of 0.5 mm is recommended for clinical application.

Objective:To address the critical issue of missing dynamic border molding information in edentulous direct digital impression technology, this study explores innovative digital solutions and conducts preliminary application validation.Methods:Based on the myostatic line theory, a methodology was established: intraoral scanner (IOS) high-frequency video was utilized to dynamically capture functional molding data of soft tissues, integrated with a self-developed mobility gradient recognition algorithm to achieve dynamic threshold segmentation between the muscle dynamic zone and myostatic zone, termed "optical digital molding technology". Ten edentulous patients with well-fitting complete dentures, treated at the Department of Prosthodontics, Peking University School and Hospital of Stomatology from January 2024 to December 2024, were enrolled. The standard deviation between the muscle static line (generated by mobility gradient algorithm with thresholds of 0.3-0.7 mm) and the denture border curve was analyzed to optimize the dynamic threshold, followed by single-case clinical validation.Results:Among the mobility thresholds of 0.3-0.7 mm, the 0.5 mm threshold yielded the smallest standard deviation between the myostatic line and denture border. Clinical validation demonstrated that dentures designed with this threshold exhibited no displacement during dynamic functional tests, with marginal sealing meeting clinical standards.Conclusions:The optical digital border molding technique for edentulous soft tissue boundaries translates the myostatic line theory into quantifiable parameters for the first time. Based on data from 10 cases, a mobility threshold of 0.5 mm is recommended for clinical application.

Objective To establish a rat model of venous thrombosis in a plateau hypobaric hypoxic environment and to investigate the effect of this environment on venous thrombosis.Methods A total of 144 healthy male SD rats were assigned randomly to four groups(n=36 rats per group):a plains sham operation(A)group,plains operation(B)group,plateau altitude 6000 m+sham operation(C)group,and plateau altitude 6000 m+surgery(D)group.Rats in A and B groups were maintained in a plains normoxic environment,while rats in C and D groups C and D were subjected to a plateau environment.Rats in the surgical groups underwent quantitative constriction to incompletely obstruct the inferior vena cava blood flow.Each group was further divided into subgroups based on time:1,3,5,7,14,and 21 d(n=6 rats per group).Regular vascular ultrasound monitoring was conducted,and blood samples were taken for whole blood viscosity testing and the assessment of inflammatory indicators,including endothelin-1(ET-1),interleukin-6(IL-6)and tissue factor(TF).Coagulation function was evaluated through the activated partial thromboplastin time(APTT),prothrombin time(PT),thrombin time(TT),fibrinogen(FIB)and D-dimer.After the observation period,the experimental animals were sacrificed and the limbs were removed.Thrombus samples were stained with hematoxylin/eosin(HE),and the thrombus wet mass was measured.Results The thrombosis incidence was significantly higher in the plateau D group than in B group,accompanied by a marked increase in blood viscosity and hematocrit(P＜0.01).Additionally,levels of ET-1,IL-6,and TF were significantly elevated(P＜0.05),indicating a coagulation disorder.Conclusions A plateau hypoxic environment model can be successfully simulated by quantitative coarctation of the inferior vena cava,combined with a specialized environmental chamber.The findings of this study suggest that a plateau hypoxic environment promotes venous thrombosis.

Objective To develop an effective method for delivering VEGF and CD47 double-modified exosomes to treat renal damage induced by heat stroke so as to reduce and repair renal damage.Methods A plasmid fusion-expressing VEGF and CD47 targeting renal injury was constructed,transfected into rat bone marrow derived mesenchymal stem cells (BMMSCs),and then fusion-exosomes were isolated and extracted.Transmission electron microscopy,nanoparticle tracking analysis,and Western blotting were used to identify the obtained exosomes.Rats were intravenously injected with 200 μg of DiD-labeled unmodified exosomes,VEGF-modified exosomes and VEGF-CD47 double-modified exosomes,respectively,through the tail vein,and the effects of exosomes on the kidneys were detected and analyzed using a small animal in vivo imaging instrument.A total of 60 SD rats were randomly divided into 6 groups,with 10 rats in each group,that is,blank control group (group A),heat stroke-induced renal injury model receiving PBS in 12,24 and 36 h after modelling (group B),empty plasmid group (group C),Exos group (group D),ExosVEGF group (group E) and ExosVEGF-CD47.Kidney tissue and blood samples were collected in 72 h after 3 times of treatment.Pathological changes in kidney tissue were observed at the tissue level and the damage were scored.Changes in serum blood urea nitrogen (BUN)and serum creatinine (Scr)levels were detected to evaluate the therapeutic effect.Western blotting and qRT-PCR were used to analyze the expression of the pro-inflammatory factors TNF-α and NF-κB,the proliferation regulatory signaling molecules Ki67,FGF2,pAMPK and pERK,and the fibrosis regulatory molecule FGF23,in order to comprehensively analyze the effects on proliferation and inhibition of fibrosis.Results BMMSCs and ExosVEGF-CD47 were successfully isolated and characterized,and a rat model of acute kidney injury was effectively constructed.Higher fluorescence intensity was found in the kidney tissue of the Exos VEGF-CD47group than the Exos-Ctrl group and Exos VEGF group (P<0.05).In 72 h after treatment,the ExosVEGF-CD47 group had significantly lower serum BUN and Scr levels (P<0.0001),and notably lower Tubular casts score (P<0.0001),decreased levels of pro-inflammatory factors TNF-α and NF-κB (P<0.0001),up-regulated Ki67 and FGF2 expression (P<0.05),and down-regulated FGF23 expression (P<0.0001)when compared with the AKI+Exos group and AKI+ExosVEGF group.Conclusion VEGF and CD47 show promise in targeting acute kidney injury induced by heat stroke,effectively mitigate damage and facilitate repair,which may be due to exosome-mediated inhibition of renal tissue inflammation,promotion of proliferation,and inhibition of fibrosis.

Disseminated intravascular coagulation (DIC) triggered by sepsis is a major challenge in the emergency and critical care of severely ill patients. The inflammasome is an essential component of the human immune system, and its activation can mediate pyroptosis and then release interleukin (IL)-1β and IL-18, which further activates platelets and the coagulation system and exacerbates inflammatory responses and coagulation processes, thus creating great uncertainty for the treatment and prognosis of sepsis. This article aims to review the correlation between the inflammasome and pyroptosis, as well as their impact on coagulation function, in hope of providing new insights for the clinical treatment of DIC.

Disseminated intravascular coagulation (DIC) triggered by sepsis is a major challenge in the emergency and critical care of severely ill patients. The inflammasome is an essential component of the human immune system, and its activation can mediate pyroptosis and then release interleukin (IL)-1β and IL-18, which further activates platelets and the coagulation system and exacerbates inflammatory responses and coagulation processes, thus creating great uncertainty for the treatment and prognosis of sepsis. This article aims to review the correlation between the inflammasome and pyroptosis, as well as their impact on coagulation function, in hope of providing new insights for the clinical treatment of DIC.

A 22-year-old female patient presented with skin flushing in the bilateral legs for 4 years, which gradually spread throughout the whole lower limbs and forearms 6 months ago. Skin examination showed diffuse flushing and dilated capillaries in the lower limbs and both forearms, and the flushing faded after a press. Histopathological examination of the skin lesion on the leg showed hyperkeratosis in a basket-like shape, increased pigmentation in the basal layer, infiltration of the superficial dermis with scattered lymphocytes, with no obvious red blood cell overflow; periodic acid-Schiff staining showed thickened and homogeneous deposits around the blood vessels; immunohistochemical staining showed thickened blood vessel walls and positive staining for type Ⅳ collagen. Diagnosis: cutaneous collagenous vasculopathy.

Objective To establish a quality evaluation method for Shengmai injection with antioxidant and anti-inflammatory effects as indicators. Methods Using water-soluble vitamin E (Trolox) and N-nitro-L-arginine methyl ester (L-NAME) as control drugs, using trinitrophenyl-hydrazine (DPPH) method and nitric oxide (NO) detection kit, the anti-oxidation effect and the inhibition ability of lipopolysaccharide (LPS)-induced NO release from mononuclear macrophage RAW264.7 were measured. The sample was converted into the corresponding concentration of the control drug to control and evaluate its methodological and biological effects. Results Each batch of samples had good anti-inflammatory and anti-oxidation effects with high precision and good repeatability. There was no significant difference in the anti-inflammation capacity among batches of. Samples 2 and 8 were significant differences from other samples in anti-inflammatory ability. Conclusion The established method can accurately evaluate the anti-oxidant and anti- inflammatory effects of Shengmai injection.