健康成人血小板膜糖蛋白的表达特征

目的　观察健康成人血小板６ 种膜糖蛋白（ Ｇ Ｐ） 在不同性别、不同年龄，静息状态与活化状态时的表达特征。方法　用流式细胞仪测定静息状态下及用凝血酶受体活化肽（ Ｔ Ｒ Ａ Ｐ） 激活的血小板所结合单抗的分子数。结果　男性静息血小板和活化血小板中 Ｇ Ｐ Ⅱｂ／ Ⅲａ 和 Ｇ Ｐ Ⅲａ 显示随年龄减少现象，在静息血小板中 Ｇ Ｐ Ⅱｂ／ Ⅲａ 和 Ｇ ＰⅢａ 值与年龄呈负相关，ｒ 值分别为 － ０ ．４０９ 和－ ０ ．５３４ ，其 Ｐ 值均＜ ０ ．０５ ；而女性中未见到类似结果。 Ｔ Ｒ Ａ Ｐ 激活后 Ｇ Ｐ Ｉｂ 在血小板表面表达下降，而 Ｇ Ｐ Ⅱｂ／Ⅲａ 、Ⅲａ 、 Ｐ选择素均增高，其中 Ｐ选择素在激活后的升高值与激活前的基础值呈负相关。静息血小板的 Ｇ ＰⅠｂ 分子数约为３０ ０００ ，它与 Ｇ Ｐ Ⅴ的比值约３∶１ 。结论　健康人血小板 Ｇ Ｐ表达存在性别和年龄差异。

Expression patterns of platelet membrane glycoprotein in healthy adults

OBJECTIVE: To study the expression patterns of 6 kinds of platelet membrane glycoprotein(GP) in resting and activated platelets of healthy adults. METHODS: The molecule numbers of platelet GPIIIa, IIb/IIIa, Ib, IX, V and P-selectin on resting platelets or platelets activated by thrombin receptor activating peptide (TRAP) in 60 healthy adults (male/female = 1/1) were detected by flow cytometry. RESULTS: The expression of GPIIb/IIIa and GPIIIa seemed to decrease with the increase of age in the resting and activated platelets of males. The coefficients of correlation(r) in resting platelets were -0.409 and -0.534 (P < 0.05), respectively; whereas this phenomenon were not found in females. The expression of GPIb was reduced while the expressions of GPIIb/IIIa, IIIa, P-selectin increased after the platelets were activated by TRAP. There was a negative relationship between resting and activated platelets in the expression of P-selectin. The molecule number of GPIb on the surface of resting platelet was about 30,000, the ratio of GPIb to GPV was 3:1. CONCLUSION: It seems that there exists some difference with age and sex in the expression of platelet membrane glycoproteins in healthy persons.