hpa antibody

14
Introduction Platelet antibody detection Speaker : 張志昇 Date: 2014/08/24

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anti-HPA antibody & platelet antibody

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Page 1: Hpa antibody

Introduction Platelet antibody detection

Speaker :張志昇Date: 2014/08/24

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PTR NAITP HIT DIT TTP ITP TRALI

Test or investigation

CCI CBC, DC CBC,DCHeparin history

Drug history DATBUN

CBC,DC

DAT BNPCBCX-ray

Serological test

PRA(class I) ELISA(Pakplus)SPRCA (capture-P, MASPAT):anti-platelet antibody screening, and cross matching PIFALuminex PRA class IMAIPAMPHA

Mother and fetusPRA(class I/II) ELISA(Pakplus)SPRCA (capture-P, MASPAT):anti-platelet antibody screeningPIFALuminex PRAMAIPAMPHA

Mother serum Vs. Father/baby plat.SPRCA, PIFA cross matching

ELISA (PF4)CAT (PF4)

R/O SPRCAELISA ( Pakplus)T (PF4)

Serum + drug, or eluentSPRCA ( Capture-P, MASPAT)SPRCA ( AC)

FRET:ADMATS-13

R/O SPRCAELISA (Pakplus) activity

ELISA (Pakauto)ELISA (Pakplus)SPRCA ( Capture-P, MASPAT ): auto antibody and allo antibodyPIFA (auto)Flow cytometry ( auto)

Donor serum ( and/or patient )Luminux PRA ( class I/class II/HNA)ELISA PRA (class I/II)flowPRA (class I/II)Leuko-agglutinin testMAIGAGIFA

Antigen HLA class I typingHPA typingCD36 typing

Parent and fetus:HLA class I/II typing, HPA typingCD 36 typing

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臨床上檢測血小板特異性抗體的方法

Solid- phase red cell adherence assay (SPRCA)

Capture-P

MASPAT

MACE (Modified antigen capture ELISA )

MAIPA

PIFT

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Solid- phase red cell adherence assay (SPRCA)

This assay can detect HLA, ABO, and platelet specific IgG antibodies. But weak reactions give immediate results.

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Application of SPRCA

Cross match (e.g. NAITP mother’s serum +father’s platelet)

+Chloroquine: differential of HLA/HPA +drug : drug-induced thrombocytopenia +auto cell: auto antibodies

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PRP preparation (ITP)

檢體收集 : 將含抗凝劑 EDTA 的全血在400 RCF 下室溫離心 10 分鐘 , 收集上層血漿部分。

病人 platelet count 檢體量< 10 K 40 mL

11~20K 40mL

21~50K 30mL

51~150K 20mL

> 150K 10mL

• 若懷疑病人有自體抗體,則病人須於最近一週內未輸過血小板濃厚液才可以抽血送檢。

• 若病人於最近三週內注射過 IVIG,則不適合此檢驗。

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1. Modified antigen capture ELISA (MACE)

-- MACE-1 and MACE-2

2. Platelet auto antibody test

ELISA Screening Test for Autoantibodies to Platelet Glycoproteins IIb/IIIa, Ib/IX and Ia/IIa

-- PAKAUTO

3. Platelet antibody of GpIIb/ IIIa identification

ELISA Test for the Detection of Antibodies Specific to epitopes on the Platelet

Glycoprotein IIb/IIIa

--- PAK 1

4. Platelet antibody

ELISA Screening Test for the Detection of HLA Class I, Platelet and weaker antibodies

--- PAKPLUS

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HPA antibodies screening material

內容物 體積 說明

HPA 、 HLA class I ELISA

strip

1 set 2x8 一條

Plate Sealers 4 PC WB Wash buffer 1 btl SD Specimen Diluent 2 mL 稀釋檢體用AH Anti-Human IgG/A/M

Conjugate10 μL 使用前以 SD 稀釋

PN PNPP Substrate 1 btl 避光玻璃瓶H2O dd Water 1 mL

SB Substrate Buffer 2 mL 稀釋基質液用ST Stop Solution 2 mL 擦手紙 一 包

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Procedure of Pakplus

1. 在所有 well中加入 300 μL WB 置於室溫 5~10分鐘2. 稀釋檢體, 100 μL血清加入 300 μL SD 3. 將反應盤中的清洗液倒掉,在吸水紙巾上拍乾4. 加入 50 μL稀釋好的檢體到 A~G wells;請勿加入 H

(blank)5. 貼好封膜,放入 37℃乾式培養箱,反應 40分鐘6. 配製二級抗體, 10 μL AH 加入 1 mL SD 低速

vortex避光備用 7. 反應 40分鐘後,倒掉盤內液體,在吸水紙巾上拍乾8. 清洗:每個 well加入 300 μL WB 、倒掉盤內液體9. 重複清洗三次後,在吸水紙巾上徹底拍乾10.A~G中加入 50 μL稀釋好的二級抗體

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Procedure of Pakplus (II)1. 輕敲 PNPP 的玻璃瓶,減少粉末附著在瓶蓋;小心的打開。2. 加入 0.5 mL dd water ,蓋回瓶蓋,搖動混和均勻3. 取 20 μL 完全溶解的 PNPP ,加入 2 mL 的 SB 中,混和均勻

避光備用4. 反應 40 分鐘後,倒掉盤內液體,在吸水紙巾上拍乾5. 清洗:每個 well 加入 300 μL WB 、倒掉盤內液體6. 重複清洗三次後,在吸水紙巾上拍乾。7. 設定計時器倒數 30 分鐘,立即進行以下步驟8. A~G 中加入 100 μL 稀釋好的 PNPP ,勿加入 H(blank) 中9. 貼好封膜,避光室溫反應 30 分鐘

( 以 PNPP 加入第一個 well 起算 )10. 計時結束後在 A~G 中加入 100 μL ST , H 中加入 200 μL

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Result and interpretation

判讀:減去 blank 吸光度, 2X 於相對列mean of negative control 則可判定為positive ,介於 1X~2X 為 bordline.

但 positive 需至少 8X 的 mean of negative control 吸光度,否則實驗Invalid 。

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GTI-PAKPLUSELISA Screening Test for the Detection of HLA Class I, Platelet and weaker antibodies

Neg. control P’t sample 1 P’t sample 2 P’t sample 3Neg. controlNeg. control

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Thanks For Your Attention