Diverse CD36 expression among Japanese population: defective CD36 mutations cause platelet and monocyte CD36 reductions in not only deficient but also normal phenotype subjects. Issue 5 (May 2015)

• Record Type: Journal Article
• Authors: Masuda, Yuya; Tamura, Shogo; Matsuno, Kazuhiko; Nagasawa, Ayumi; Hayasaka, Koji; Shimizu, Chikara; Moriyama, Takanori
• Is Part Of: Thrombosis research. Volume 135:Issue 5(2015)
• Page Start: 951
• Page End: 957
• Publication Date: 2015-05
• Subjects: Thrombosis -- Periodicals; 616.135
• DOI: 10.1016/j.thromres.2015.03.002
• Languages: English
• ISSNs: 0049-3848

Abstract

<abstract abstract-type="author" id="ab0015"> <title id="st0075">Abstract</title> <sec> <title id="st0080">Introduction</title> <p id="sp0070">CD36 is a multifunctional glycoprotein expressed on various human cells, including platelets and monocytes. Five <italic>CD36</italic> gene mutations (C268T, 949insA, 329-339del, 1228-1239del and 629-631del/insAAAAC) are mainly responsible for CD36-deficient phenotypes in Japan. It has also been reported that platelet CD36 expression varies widely among normal phenotype individuals. Here, in order to obtain further insight into CD36 expression, we investigated the association between platelet and monocyte CD36 expression levels and defective mutations in the Japanese population.</p> </sec> <sec> <title id="st0085">Materials and Methods</title> <p id="sp0075">Blood samples were collected from 135 healthy Japanese volunteers. CD36 expression levels on platelets and monocytes were quantitatively analyzed by flow cytometry. Real-time PCR, PCR-RFLP and allele-specific PCR were performed to detect mutant genotypes.</p> </sec> <sec> <title id="st0090">Results</title> <p id="sp0080">In this population, we found 2 (1.5%) and 9 (6.7%) CD36-deficient subjects as type I and type II, respectively. Among normal phenotype subjects, CD36 expression levels ranged from 1, 259 to 11, 002 (4, 487 ± 2, 017) molecules/platelet and from 211 to 5, 150 (1, 628 ± 986) molecules/monocyte. Genotyping assay showed that heterozygotes with the defective mutations were present in normal (12.9%) and type II-deficient (66.7%) subjects, and that these heterozygous mutations led to decreases in CD36 surface expression on platelets and monocytes.</p> </sec> <sec> <title id="st0095">Conclusions</title> <p id="sp0085">Heterozygous CD36 mutations, previously known to lead to deficiency in this molecule, are one of the factors responsible for the diversity of CD36 surface expression levels on platelets and monocytes in normal phenotype subjects.</p> </sec> </abstract>