Pin1 aggravates renal injury induced by ischemia and reperfusion in rats via Nrf2/HO-1 mediated endoplasmic reticulum stress

Purpose: To investigate the role of peptidyl-prolyl cis/trans isomerase 1 (Pin1) on renal ischemia-reperfusion (I/R) injury and underlying mechanism. Methods: By establishing the in vitro and in vivo models of renal I/R, the role of Pin1 was explored by using molecular assays. Results: In renal I/R, endogenous Pin1 level was up-regulated in I/R-impaired kidney. Suppression of Pin1 with juglone afforded protection against I/R-mediated kidney dysfunction, and reduced I/R-induced endoplasmic reticulum (ER) stress in vivo. Consistent with the in vivo results, repression of Pin1 with juglone or gene knockdown with si-Pin1 conferred cytoprotection and restricted hypoxia/reoxygenation (H/R)-driven ER stress in HK-2 cells. Simultaneously, further study uncovered that Nrf-2/HO-1 signals was the association between Pin1 and ER stress in response to renal I/R. In addition, Nrf-2/HO-1 signal pathway was inactivated after kidney exposed to I/R, as indicated by the down-regulation of Nrf-2/HO-1 levels. Furthermore, inhibition of Pin1 remarkably rescued the inactivation ofNrf-2/HO-1. Conclusions: Pin1 modulated I/R-mediated kidney injury in ER stress manner dependent on Nrf2-HO-1 pathway in I/R injury.

Expression of Pin1 and Ki67 in gastrointestinal stromal tumors and their clinical significance / 中华内分泌外科杂志

Objective To investigate the relationship between the expression of Pin1 and Ki67 and the clinicopathologic features of gastrointestinal stromal tumors (GIST).Methods 40 paraffin-embeded specimens of surgical resected GIST from Jan.2013 to May.2015 in Pathology Department of Yuhuangding Hospital Affiliated to Qingdao University were retrieved and expressions of Pin1 and Ki67 were detected by immunohistochemical methods.Results The positivity rate of Pin1 and Ki67 in GIST was 80％ and 32.5％ respectively.The expression of Pin1 was associated with malignancy of GIST,tumor location,tumor size and mitotic counts.The expression of Ki67 is associated with malignancy of GIST,tumor location,tumor size,mitotic counts and tumour necrosis.Pin1 expression was positively related with Ki67 expression.Conclusion Pin1 and Ki67 is closely related with malignancy of GIST,which may be potential factors in predicting prognosis of GIST.

Cloning and characterization of Giardia intestinalis cyclophilin

The cyclophilins (Cyps) are family members of proteins that exhibit peptidylprolyl cis-trans isomerase (PPIase, EC 5.2.1.8) activity and bind the immunosuppressive agent cyclosprin A (CsA) in varying degrees. During the process of random sequencing of a cDNA library made from Giardia intestinalis WB strain, the cyclophilin gene (gicyp 1) was isolated. An open reading frame of gicyp 1 gene was 576 nucleotides, which corresponded to a translation product of 176 amino acids (Gicyp 1). The identity with other Cyps was about 58-71%. The 13 residues that constituted the CsA binding site of human cyclophilin were also detected in the amino acid sequence of Gicyp 1, including tryptophan residue essential for the drug binding. The single copy of the gicyp 1 gene was detected in the G. intestinalis chromosome by southern hybridization analysis. Recombinant Gicyp 1 protein clearly accelerated the rate of cis--

Preliminary Study on Anticyclophilin A Auto Antibodies in Sera of Patients wit h Psoriasis / 中华皮肤科杂志

0.05). Conclusion The results suggest that there is autoimmunological mechani sm in the pathogenesis of psoriasis.