Anti-ITGA5 monoclonal antibody, clone MFR5 (5H10)

Adsorption of proteins associating with their conformational changes plays crucial roles in regulating biomaterial-cell interactions and consequent tissue responses to implanted biomaterials. This study reports direct visualization of typical serum protein, vitronectin, one of the key adhesive proteins that participate in mediating cell behaviors, upon adsorption on typically designed surfaces. Carbon films with their surfaces being plasma grafted functional groups -COOH and -NH2 are used as the model substrata for this study. Negative-staining electron microscopy technique is employed for visualizing the adsorbed protein and 2D image classification is made and interpreted. Results show that adsorbed vitronectin tends to form multimer aggregate on the -COOH-grafted surfaces, exposing extensively its cell-binding RGD (arginineglycine-aspartic acid) motif for enhanced cell adhesion. The adsorbed vitronectin on the -NH2-grafted surface forms dimer aggregate with the binding sites being enwrapped. The -COOH-grafting triggers enhanced expressions of ITGA5, ITGAV, ITGB1, and ITGB3 of the adhered cells and this is likely attributed to the special spatial alignment of vitronectin upon adsorption. The conformational information of adsorbed vitronectin gained from the single particle electron micro-scopy analyses would shed light on design and construction of appropriate biomaterials surfaces for desired cellular behaviors.

Background: Gastric cancer exhibits familial clustering, and gastric cancer familial relatives (GCF) tend to present with corpus-predominant gastritis and precancerous lesions as SPEM or IM after H. pylori infection. The study determined whether the children of gastric cancer patients (GCA) had genomic single nucleotide polymorphisms (SNPs) predisposed to the gastric precancerous lesions as spasmolytic polypeptide-expressing metaplasia (SPEM) or intestinal metaplasia (IM). Results: There were 389 family relatives of 193 non-cardiac GCA and 173 duodenal ulcer patients (DU), received blood sampling for DNA collection. The differences of the risk alleles of SNPs in the ITGA5, ITGB1, IL-10, COX-2, RUNX3, and TFF2 genes were compared between 195 children of GCA and 143 DU. The children of GCA had higher allele frequencies of ITGA5-1160 T-carrier (P = 0.006, OR[95% CI] = 2.2[1.2-4]), ITGB1-1949 A-carrier (P = 0.047; OR[95% CI] = 2.8[1.4-5.3]), ITGB1 + 31804 C-carrier (P = 0.013; OR[95% CI] = 4.7[1.7-13.0]), IL-10-592 AA (P = 0.014; OR [95% CI] = 2.3[1.4-4.0]) and COX-2-1195 G-carrier (P = 0.019; OR[95% CI] = 1.7[0.9-3.2]) than DU. The combined genotype with ITGA5-1160/ITGB1-1949/ITGB1 + 31804 as T/A/C carriers and COX-2-1195/IL-10-592 as G-carrier/AA was more prevalent in the children of GCA than in DU (P < 1x10(-4)), and predisposed with a 5.3-fold risk of getting SPEM in the H. pylori-infected children of GCA (P = 0.016). Such risk of getting SPEM increased to 112 folds, if combined with RUNX3 + 492/TFF2-308 as A-carrier/CC in this limited study scale (P = 1x10(-4)). Conclusions: The SNPs of ITGA5-1160/ITGB1-1949/ITGB1 + 31804 as T/A/C carriers and COX-2-1195/IL-10-592 as G-carrier/AA, or more specific to combine RUNX3 + 492/TFF2-308 as A-carrier/CC shall be host factor predisposing to gastric cancer during H. pylori infection, and serve as marker to identify high-risk subjects for H. pylori eradication.