Peptide-drug conjugates (PDCs): a novel trend of research and development on targeted therapy, hype or hope?

Peptide-drug conjugates (PDCs) are the next generation of targeted therapeutics drug after antibody-drug conjugates (ADCs), with the core benefits of enhanced cellular permeability and improved drug selectivity. Two drugs are now approved for market by US Food and Drug Administration (FDA), and in the last two years, the pharmaceutical companies have been developing PDCs as targeted therapeutic candidates for cancer, coronavirus disease 2019 (COVID-19), metabolic diseases, and so on. The therapeutic benefits of PDCs are significant, but poor stability, low bioactivity, long research and development time, and slow clinical development process as therapeutic agents of PDC, how can we design PDCs more effectively and what is the future direction of PDCs? This review summarises the components and functions of PDCs for therapeutic, from drug target screening and PDC design improvement strategies to clinical applications to improve the permeability, targeting, and stability of the various components of PDCs. This holds great promise for the future of PDCs, such as bicyclic peptide‒toxin coupling or supramolecular nanostructures for peptide-conjugated drugs. The mode of drug delivery is determined according to the PDC design and current clinical trials are summarised. The way is shown for future PDC development.

[Clnical observation, of the effects of lattice ultra pulse carbon dioxide laser combined with traditional Chinese medicine on the treatment of hyperplastic scar].

OBJECTIVE: To explore the clinical effects of lattice ultra pulse carbon dioxide laser combined with traditional Chinese medicine ( Fuchunsan ) on the treatment of postburn hyperplastic scar. METHODS: Sixty-three patients with hyperplastic scar after burn injury hospitalized from February 2012 to June 2014 in our department were treated with lattice ultra pulse carbon dioxide laser combined with traditional Chinese medicine (Fuchunsan). Patients were divided into early stage group (E, n = 35), middle stage group (M, n = 25), and late stage group ( L, n = 3) according to the formation time of scar, which was respectively 3 weeks to 3 months, longer than 3 months and less than or equal to 6 months, and 3 to 15 years in groups E, M, and L. The number of times of laser treatment of patients in each group was recorded. The degree of scar pain in patients of the three groups was assessed by the Numerical Rating Scale (NRS) before treatment and after treatment for 1, 2, and 3 times. The scar condition of patients in groups E and M was assessed by the Vancouver Scar Scale (VSS) before treatment and after treatment for 1, 3, and 5 times. Patients in group L did not receive VSS assessment but were evaluated by clinical observation only. Photos of scar in treating area were taken before treatment and after treatment for 3 and 5 times to evaluate the clinical effect. Data were processed with t test. RESULTS: Patients in groups E and M were treated with laser for (4.8 ± 1.1) and (7.7 ± 2.1) times respectively. In group L, the treatment was stopped in 2 patients after laser treatment for 5 times, and 1 patient received laser treatment for 12 times. The degree of pain in patients of groups E and M was alleviated significantly after treatment for one time, and the number of patients scoring 1-4 point(s) in NRS increased from 5 cases to 38 cases. After treatment for 2 and 3 times, the increase in the number of patients scoring 1-4 point (s) in NRS was on a small scale. Before treatment and after treatment for 1 time, VSS scores of patients in groups E and M were similar (with values respectively 0.641 and 0. 082, P values above 0. 05). After treatment for 3 and 5 times, VSS scores of patients in group E were respectively (9.2 ± 0.8) and (7.0 ± 1.1) points, which were significantly lower than those in group M [ (9.7 ± 1.0) and (8.2 ± 1.0) points, with values respectively -1.993 and -4.433 , P < 0.05 or P < 0.01]. After treatment for 3 times, the rate of improvement in appearance was respectively 88.6% (31/35) and 72.0% (18/25) in groups E and M, and it was respectively 100.0% (35/35) and 96.0% (24/25) after treatment for 5 times. No significant effect in appearance was found in the 3 patients in group L. CONCLUSIONS: Early application of lattice ultra pulse carbon dioxide laser combined with traditional Chinese medicine (Fuchunsan) for the treatment of postburn hyperplastic scar is effective.

Effects of polysaccharide sulfate on cardiovascular diseases induced by type 2 diabetes / 中国药理学通报

Aim To explore the pharmacological mechanism and the effects of polysaccharide sulfat(PSS) on cardiovascular diseases induced by type 2 diabetes mellitus(DM) through observing the risk factors.Methods Type 2 diabetic animal model was established by high-sugar and high-fat diets,combined with injection of small amount streptozotocin(STZ 20 mg?kg-1,iv).Adult male wistar rats were divided into five groups: normal control group,model group,polysaccharide sulfate group,metformin group and lovastatin group.They were treated with exact medicne for 8 weeks,but control group and model group were treated with 0.9% Nacl.During this process,FBG and serum lipid concentrations were measured.22 weeks later,the rats were sacrificed.The activity of tissue-type plasminogen activator(t-PA) and plasminogen activator inhibitor type-1(PAI-1) were detected by chemical methods.The aortas were collected for histopathlogical,immunohistochemical and Western blot studies.Results FBG concentrations and serum lipid(TC,TG,LDL) levels decreased in PSS group as compared from those of model group(P

APPLICATION OF CT AND MRI FUSION IMAGE TECHNOLOGY IN CRANIOFACIAL REGION / 解放军医学杂志

To achieve the fusion of cranio-jaw-facial CT and MRI image,the single value decomposition-iterative closest point method based on contour feature and the multiresolution method based on wavelet pyramid were used.The results showed that the fusion was operated easily and promptly,its images were satisfactory and its reliability was good. The fusion of cranio-jaw-facial CT and MRI image was obtained. It suggested that the fusion of cranio-jaw-facial CT and MRI image was feasible in clinical practice. It can provide the image basis helping the analysis of diagnosis and treatment for diseases of the cranio-jaw-facial region with complicated anatomical formation.