Inflammatory bowel disease (IBD) is a chronic immune-mediated gastrointestinal inflammatory disorder that includes ulcerative colitis (UC) and Crohn disease (CD). Currently, there is a lack of reliable diagnostic methods for IBD. Endoscopic biopsy is one of the common methods for detecting IBD, but it has limitations. In non-invasive assessment of IBD, ultrasound, CT, and MRI are less invasive and better tolerated than endoscopy, and can show the complete bowel condition, assess the thickness of the intestinal wall, and detect parenteral complications. Meanwhile, with the further study of IBD biomarkers, SPECT and PET are increasingly used in early diagnosis and efficacy monitoring of IBD, especially in patients who cannot tolerate invasive tests. The continuous developments of the above imaging techniques provide a more minimally invasive method than endoscopy for early non-invasive diagnosis and efficacy monitoring of IBD. This article reviews the latest research and application progress of the above imaging techniques in IBD.

Objective: To evaluate the clinical efficacy of digitally guided precision crown lengthening in secondary aesthetic rehabilitation cases, and to provide a clinical reference for digitally guided crown lengthening procedures and secondary aesthetic restorations. Methods: We present a case of a patient with tetracycline-stained teeth, partial detachment of anterior resin veneers, and gingival margin discrepancies. The patient underwent digitally guided precision crown lengthening followed by secondary aesthetic rehabilitation. Multimodal data, including intraoral, facial, and CBCT scans, were integrated to construct a four-dimensional virtual patient model (incorporating teeth, face, bone, and occlusion) for surgical planning and 3D-printed guide fabrication. Secondary aesthetic restoration was performed after achieving stable post-surgical outcomes. Based on this case, we conducted a detailed analysis and reviewed relevant literature on crown lengthening in secondary aesthetic rehabilitation. Results: The gingival contour of the anterior teeth exhibited significant improvement, with enhanced symmetry and stable gingival margin positioning that closely matched the preoperative design. The crown lengthening procedure demonstrated high precision, and the final outcome was aesthetic and functional. Literature review indicated that secondary restorations frequently present challenges such as gingival contour discrepancies and inflammation. Aesthetic crown lengthening in the anterior region should optimize both soft and hard tissue morphology to meet aesthetic standards, with digital technology improving procedural accuracy. Conclusion Precision crown lengthening effectively addresses gingival margin discrepancies in secondary aesthetic rehabilitation, ensuring stable gingival positioning and superior aesthetic outcomes. This approach is particularly suitable for cases with high aesthetic demands.

Objective:To explore the spatial correlation between gray matter volume (GMV) changes and neurotransmitter receptors/transporters in patients with first-episode schizophrenia (FES) .Methods:Fifty-four FES patients(FES group) and fifty-nine healthy controls (HC group) were selected from June 2014 to May 2020 in the Psychiatry Department of Renmin Hospital of Wuhan University. Structural magnetic resonance imaging (sMRI) was conducted on all subjects. Differences of GMV were compared across 400 cortical regions and 32 subcortical regions. Based on the positron emission tomography(PET) data from Neuromaps, which provides the density of 19 different neurotransmitter receptors and transporters, Spearman correlation analysis was performed to evaluate the spatial correlation between GMV changes and neurotransmitter systems.Results:Compared to the HC group, FES group exhibited significant GMV reductions in widespread cortical (90/400) and subcortical (6/32) regions (all FDR-corrected P<0.05). The effect size of GMV reduction (Cohen’s d) showed significant positive correlations with the density of 5-hydroxytryptamine 1a(5HT1a) ( r=0.400, Pspin=0.002), γ-aminobutyric acid type A receptor(GABA A)( r=0.307, Pspin=0.002), and metabotropic glutamate receptor 5(mGluR5) ( r=0.275, Pspin=0.020) receptors (all FDR-corrected P<0.05). Conclusion:GMV reductions in a wide range of brain regions existed in patients with FES. There are significant correlations between 5HT1a, GABA A and mGluR5 receptors and gray matter reduction in patients with FES. The disorder of these neurotransmitter receptors may be the potential neurobiological mechanism of gray matter structural abnormalities in the early stage of schizophrenia.

Objective To explore the relationships of vitamin D and oxidized low-density lipoprotein(ox-LDL)with infertility in patients with polycystic ovary syndrome(PCOS)based on restricted cubic spline models.Methods A total of 150 PCOS patients were selected as the study subjects and followed up for at least 1 year.They were divided into infertile group and non-infertile group according to whether they were infertile.A Logistic regression model was used to analyze the influencing factors of infertility in PCOS patients.Furthermore,the relationships of 1,25-dihydroxyvitamin D3[1,25-(OH)2D3]and ox-LDL with infertility in PCOS patients,as well as their interactive effects on infertility in PCOS patients were analyzed.A restricted cubic spline model was used to analyze the non-linear relationships between 1,25-(OH)2D3,ox-LDL,and infertility in PCOS patients.Results Among 150 PCOS patients,78 were not pregnant,resulting in an infertility rate of 52.00％(78/150).Multivariate Logistic regression analysis showed that the severity of PCOS,body mass index,age,1,25-(OH)2D3,and ox-LDL were all independent influencing factors for infertility in PCOS patients(P＜0.05).After adjusting for confounding factors,1,25-(OH)2D3 and ox-LDL were still associated with the risk of in-fertility in PCOS patients(P＜0.05).Restricted cubic spline model analysis revealed non-linear rela-tionships between 1,25-(OH)2D3,ox-LDL,and the risk of infertility in PCOS patients(P＜0.05).When the serum 1,25-(OH)2D3 level was＜35.70 nmol/L,it was negatively correlated with the risk of infertility in PCOS patients(P＜0.05).When the serum ox-LDL level was ≥381.00 μg/L,it was positively correlated with the risk of infertility in PCOS patients(P＜0.05).Interactive effect analysis showed that 1,25-(OH)2D3 and ox-LDL had antagonistic effects on infertility in PCOS pa-tients(P＜0.05).Conclusion Decreased serum 1,25-(OH)2D3 levels and increased ox-LDL levels in PCOS patients can significantly increase the risk of infertility.Moreover,there is a non-lin-ear dose-response relationship and an antagonistic interactive effect between them,suggesting that regulating vitamin D and oxidative stress levels may be an important strategy for improving the fertili-ty outcomes of PCOS patients.

Objective:To explore the spatial correlation between gray matter volume (GMV) changes and neurotransmitter receptors/transporters in patients with first-episode schizophrenia (FES) .Methods:Fifty-four FES patients(FES group) and fifty-nine healthy controls (HC group) were selected from June 2014 to May 2020 in the Psychiatry Department of Renmin Hospital of Wuhan University. Structural magnetic resonance imaging (sMRI) was conducted on all subjects. Differences of GMV were compared across 400 cortical regions and 32 subcortical regions. Based on the positron emission tomography(PET) data from Neuromaps, which provides the density of 19 different neurotransmitter receptors and transporters, Spearman correlation analysis was performed to evaluate the spatial correlation between GMV changes and neurotransmitter systems.Results:Compared to the HC group, FES group exhibited significant GMV reductions in widespread cortical (90/400) and subcortical (6/32) regions (all FDR-corrected P<0.05). The effect size of GMV reduction (Cohen’s d) showed significant positive correlations with the density of 5-hydroxytryptamine 1a(5HT1a) ( r=0.400, Pspin=0.002), γ-aminobutyric acid type A receptor(GABA A)( r=0.307, Pspin=0.002), and metabotropic glutamate receptor 5(mGluR5) ( r=0.275, Pspin=0.020) receptors (all FDR-corrected P<0.05). Conclusion:GMV reductions in a wide range of brain regions existed in patients with FES. There are significant correlations between 5HT1a, GABA A and mGluR5 receptors and gray matter reduction in patients with FES. The disorder of these neurotransmitter receptors may be the potential neurobiological mechanism of gray matter structural abnormalities in the early stage of schizophrenia.

AIM:To evaluate the pharmacokinet-ics(PK)and pharmacodynamics(PD)of two recom-binant human insulin injection by euglycemic clamp technology in healthy male subjects after a single subcutaneous injection.METHODS:We con-ducted a randomized,open-label,single dose,two period,crossover study.A total of 24 healthy male subjects were enrolled and randomized to receive single subcutaneous doses(0.2 U/kg)of the investi-gational products every period.The PK and PD characteristics were assessed by euglycemic clamp up to 14 hours after dosing.RESULTS:Euglycemic clamp technique was successfully established.C-peptide levels detected at each time point before and after administration indicated that endoge-nous insulin secretion was inhibited in the two groups after administration.The geometric mean ratio of Cmax and AUC0-tand 90％confidence interval(CI)of test preparation and reference preparation under fasting condition were in the range of 80.00％-125.00％.CONCLUSION:The human insulin produced by KP Biotech demonstrated similarity to the reference preparation Humulin? in PK and PD characteristics in healthy Chinese subjects.

AIM:To evaluate the pharmacokinet-ics(PK)and pharmacodynamics(PD)of two recom-binant human insulin injection by euglycemic clamp technology in healthy male subjects after a single subcutaneous injection.METHODS:We con-ducted a randomized,open-label,single dose,two period,crossover study.A total of 24 healthy male subjects were enrolled and randomized to receive single subcutaneous doses(0.2 U/kg)of the investi-gational products every period.The PK and PD characteristics were assessed by euglycemic clamp up to 14 hours after dosing.RESULTS:Euglycemic clamp technique was successfully established.C-peptide levels detected at each time point before and after administration indicated that endoge-nous insulin secretion was inhibited in the two groups after administration.The geometric mean ratio of Cmax and AUC0-tand 90％confidence interval(CI)of test preparation and reference preparation under fasting condition were in the range of 80.00％-125.00％.CONCLUSION:The human insulin produced by KP Biotech demonstrated similarity to the reference preparation Humulin? in PK and PD characteristics in healthy Chinese subjects.

Inflammatory bowel disease (IBD) is a chronic immune-mediated gastrointestinal inflammatory disorder that includes ulcerative colitis (UC) and Crohn disease (CD). Currently, there is a lack of reliable diagnostic methods for IBD. Endoscopic biopsy is one of the common methods for detecting IBD, but it has limitations. In non-invasive assessment of IBD, ultrasound, CT, and MRI are less invasive and better tolerated than endoscopy, and can show the complete bowel condition, assess the thickness of the intestinal wall, and detect parenteral complications. Meanwhile, with the further study of IBD biomarkers, SPECT and PET are increasingly used in early diagnosis and efficacy monitoring of IBD, especially in patients who cannot tolerate invasive tests. The continuous developments of the above imaging techniques provide a more minimally invasive method than endoscopy for early non-invasive diagnosis and efficacy monitoring of IBD. This article reviews the latest research and application progress of the above imaging techniques in IBD.

Objective To optimize the preparation process of hydroxysafflor yellow A(HSYA)nanoparticle and conduct in vitro release evaluation.Methods HSYA nanoparticles were prepared with PLGA as carrier by modified compound emulsion method.The optimal preparation process of the experiment was selected by Plackett-Burman and Box-Behnken response surface method.The nanoparticles were characterized by using particle size analyzer,TEM scanning electron microscope,Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD).Frozen(4℃)storage stability,stability in physiological medium,lyophilized protective agent and in vitro release rate were investigated.Results The optimal process prescription of nanoparticle is as follow:pH value is 6.95,the dosage is 2.8 mg,and carrier dosage is 18.2 mg.The size of nanoparticles obtained at optimum condition is(176.4±1.29)nm,the polydiseperse index(PDI)is 0.152±0.014,the Zeta potential is(-17.6±0.46)mV,the encapsulation rate is(78.5±0.49)％,drug loading is(7.3±0.07)％.These nanoparticles showed round and good dispersion.Good stability in 4℃ storage environment and different physiological media of nanoparticles were observed.The best lyophilized protective agent was 1％glucose and the in vitro release rate of nanoparticles at 48 hours was 85％.Conclusion The optimization method is reasonable and reliable.The obtained nanoparticles have good stability and sustained-release effect.The in vitro release behavior conformed to first-order kinetic model.

ObjectiveTo establish a qualitative and quantitative analysis method for chemical constituents in Liu Junzitang（LJZT）， and to clarify its material basis. MethodThe chemical constituents in LJZT were analyzed by ultra performance liquid chromatography-quadrupole-time-of-flight mass spectrometry（UPLC-Q-TOF-MS/MS）， and the resulting compounds were identified by using databases， such as MassBank， PubChem， ChemSpider， Traditional Chinese Medicine Systems Pharmacology Database and Analytical Platform（TCMSP）， and by combining with relevant literature. UPLC was used to establish a quantitative method for analysis of 9 compounds in LJZT， including liquiritin， hesperidin， lobetyolin， liquiritigenin， glycyrrhizic acid， nobiletin， tangeretin， atractylenolide Ⅱ and Ⅰ. ResultBy combining the relevant literature， database and MS information， a total of 79 compounds were identified from LJZT， including 31 flavonoids， 15 terpenoids， 14 nitrogen-containing compounds， 6 phenylpropanoids， 6 organic acids and 7 other compounds. The established quantitative analytical method for the nine representative components showed good linearity within their respective linear ranges， and the precision， stability， reproducibility and recovery were in accordance with the requirements. The quantitative results showed that the contents of liquiritin， hesperidin， lobetyolin， liquiritigenin， glycyrrhizic acid， nobiletin， tangeretin， atractylenolide Ⅱ and Ⅰ in LJZT were 0.376 5， 2.602 1， 0.082 6， 0.128 1， 1.778 6， 0.015 7， 0.006 7， 0.030 4， 0.003 2 mg·g^-1， respectively. ConclusionThe established method can quickly， sensitively and accurately analyze the chemical constituents in LJZT， clarify that the material basis of LJZT is mainly flavonoids， terpenoids and nitrogen-containing compounds， and simultaneously determine the contents of the 9 components， which can lay a foundation for the research on quality control， mechanism and clinical application of LJZT.