Molecular characterization and expression analysis of cathepsin C in Chinese giant salamander (Andrias davidianus) after Aeromonas hydrophila infection

Background: Cathepsin C (CTSC) (dipeptidyl peptidase I, DPPI), is a member of the papain superfamily of cysteine proteases and involves in a variety of host reactions. However, the information of CTST in Chinese giant salamander (Andrias davidianus), an amphibian species with important evolutionary position and economic values, remained unclear. Results: The full-length salamander CTSC cDNA contained a 96 bp of 5'-UTR, a 1392 bp of ORF encoding 463 amino acids, and a 95 bp of 3'-UTR. The salamander CTSC possessed several sequence features similar to other reported CTSCs such as a signal peptide, a propeptide and a mature peptide. The active site triad of Cys, His and Asn were also found existing in salamander CTSC. Salamander CTSC mRNA was constitutively expressed in all the examined tissues with significantly variant expression level. The highest expression of CTSC was in intestine, followed with stomach, spleen, lung and brain. Following Aeromonas hydrophila infection for 12 h, salamander CTSC was significantly up-regulated in several tissues including lung, spleen, brain, kidney, heart, stomach and skin. Conclusion: CTSC plays roles in the immune response to bacterial infection, which provided valuable information for further studying the functions of CTSC in salamander.

Study on inhibitory effects of Triperygium Wilfordii Polyglucoside on Dipeptidyl peptidase I and regulatory mechanism / 中国免疫学杂志

Objective:Dipeptidyl peptidase I(DPPI),a lysosomal cysteine protease for serine proteases activation,highly expressed in granule immune cells.This study used collagen induced arthritis(CIA) rat model to investigate the effects of Triperygium Wilfordii Polyglucoside(TWP) on DPPI activity and the pharmacological mechanism in RA treatment.Methods:Rats were divided into four groups randomly,the blank control group,the CIA model group,the high dose (5.0 mg/100 g body-weight) and low dose(2.5 mg/100 g body-weight)treatment group.Bovine collagen-Ⅱ plus complete Freund′s adjuvant injected twice in rats.Physical assessments were carried out.12 days post-injections,the rats of treatment group were intragastric administered with TWP every day.The rats were killed after two week administrations.Serum and synovial membrane homogenates were collected and DPPI activity was detected by fluorescence substrate.Joint HE staining and cell counting were carried out,Zymography was used to detect the MMP-2/9 activity in synovial fluids.Total protein in synovial membrane homogenates were measured by BCA method.Results:TWP could reduce the number of CIA synovial tissue mast cells,inhibited DPPI activity in the synovial fluids and in serum.The expression levels of MMP-2/9 activity and synovium total protein content were also reduced by TWP.Conclusion:Triperygium Wilfordii Polyglucoside has inhibitory effects on DPPI activity on CIA rats,which might be the one of the pharmacological mechanisms in RA treatment.

The effects of DPPI on LPS-induced periodontitis in mice / 实用口腔医学杂志

Objective:To study the effect of dipeptidyl peptidase I(DPPI)on the damage of alveolar bone and inflammatory re-sponse of periodontium in periodontitis mice.Methods:Periodontitis model of left first molars was established in 1 0 DPPI-/-mice and 1 0 wild type(WT)mice by E.coli LPS injection and the right ones were served as the control by PBS injection.Micro-CT scanning and HE staining were performed to compare the damage of alveolar bone and inflammatory response of periodontium between the 2 groups.Results:The decreace of alveolar bone height in DPPI-/-mice was less than that in WT mice〔(Maxillary:(0.001 7 ± 0.000 4)mm vs (0.202 0 ±0.008 6)mm;Mandibular:(0.034 2 ±0.002 9)mm vs (0.332 8 ±0.01 2 5)mm〕(P<0.05).HE staining showed that the inflammatory response of periodontium in DPPI-/-mice was less severe than that in WT mice.Conclusion:DPPI may promote the inflammatory response of periodontis in mice.

Você conhece esta síndrome? / Do you know this Syndrome?

A síndrome de Papillon-Lefèvre ou queratodermia transgressiva com periodontopatia é genodermatose rara, com acometimento cutâneo e dentário. As alterações aparecem por volta do primeiro ano de vida, com queratodermia transgressiva palmoplantar associada a periodontites, com perda precoce dos dentes decíduos e permanentes. É freqüentemente associada com infecções bacterianas da pele e de órgãos internos. A histopatologia é inespecífica, sendo o diagnóstico eminentemente clínico.

Papillon-Lefèvre syndrome, or palmoplantar keratoderma with periodontitis, is a rare genodermatosis with cutaneous and dental repercussions. The condition appears at around the first year of life, with transgressive palmar-plantar keratoderma associated with periodontitis, early loss of both deciduous and permanent teeth. It is frequently associated with pyogenic infection of the skin and internal organs. Histopathology is nonspecific, the diagnosis being eminently clinical.