Rabbit Anti-Human SERPINB8 Polyclonal antibody

Relatively little is known about the interaction between genes and environment in the complex etiology of age-related macular degeneration (AMD). This study aimed to identify novel factors associated with AMD by analyzing gene-smoking interactions in a genome-wide association study of 1207 AMD cases and 686 controls of Caucasian background with genotype data on 668,238 single nucleotide polymorphisms (SNPs) after quality control. Participants' history of smoking at least 100 cigarettes lifetime was determined by a self-administered questionnaire. SNP associations modeled the effect of the minor allele additively on AMD using logistic regression, with adjustment for age, sex, and ever/never smoking. Joint effects of SNPs and smoking were examined comparing a null model containing only age, sex, and smoking against an extended model including genotypic and interaction terms. Genome-wide significant main effects were detected at three known AMD loci: CFH (P= 7.51x1030), ARMS2 (P= 1.94x1023), and RDBP/CFB/C2 (P= 4.37x1010), while joint effects analysis revealed three genomic regions with P< 105. Analyses stratified by smoking found genetic associations largely restricted to nonsmokers, with one notable exception: the chromosome 18q22.1 intergenic SNP rs17073641 (between SERPINB8 and CDH7), more strongly associated in nonsmokers (OR= 0.57, P= 2.73 x 105), with an inverse association among smokers (OR= 1.42, P= 0.00228), suggesting that smoking modifies the effect of some genetic polymorphisms on AMD risk.

Background: The intracellular serpin, proteinase inhibitor 8(PI8/Serpinb8), can in hi bit furin, a prohormone convertase involved in inflammation, prohormone processing and extracellular matrix remodeling. Unilateral ureteral obstruction (UUO) is a well-characterized model of kidney disease associated with interstitial fibrosis, where recovery involves cellular proliferation and extracellular matrix remodeling. Given the presence of mouse PI8 (mPI8) in kidney, the UUO technique was used to investigate its potential role in kidney disease and regeneration. Methods: RT-PCR and in situ hybridization was used to assess PI8 mRNA in kidney sections. Immunohistochemistry was used to examine mPI8 distribution in normal kidney, and following reversal of UUO. Results: mPI8 mRNA was detected in whole kidney by RTPCR, and by in situ hybridization in convoluted tubules of the renal cortex and medulla. In normal and control contralateral unobstructed kidneys, mPI8 was within the ascending limb and convoluted section of the distal tubules. PI8 distribution did not change in UUO kidney, but was significantly altered in reversed UUO kidney, appearing in regions containing nephrons undergoing remodeling. These included regenerating proximal and distal tubules and glomeruli. Conclusions: mPI8 distribution alters during kidney regeneration, possibly to control a prohormone convertase involved in inflammation or tissue repair. Copyright (C) 2006 S. Karger AG, Basel.