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B???????????????

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Title: Author: lingzhang Last modified by: Piggy Created Date: 11/10/2000 9:00:14 AM Document presentation format: – PowerPoint PPT presentation

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Title: B???????????????


1
???? ????? B??????????????? Humoral Immune
Responses
2
???????? Humoral Immune Response
  • (?)???????????,?????????
  • ??????????????
  • (?)????
  • ??????B1, B2
  • ???????Th????
  • (?)???????????????????

3
  • (?)B?????????
  • ?????
  • ??????FDC??????????,
  • ?????????,??B???

4
??? B???TD???????
  • ? B???TD?????
  • BCR??????????B?????
  • ? ????????Iga?Igß?????
  • Iga?Igß?????????(????1)

5
BCR??? BCR complex
6
B?????????? Two-signal model for B cell
activation
??Th ?????
7
  • (?)B???????????
  • ???B????,CDl9?CD21?CD81(TAPA?1)?CD225(Le
    u?13)???????B????????????
  • (?)BCR???????????
  • BCR??????B???????T??????????????

8
??Th???B??????????
  • (?)Th???B??????????????????(TD)??,???????????????T
    h?????
  • (?)T??????????T????????

9
Th????B?? Th cells help to activate B cells
????
CD40
CD40L
BCR
B
Th
TCR
MHCII
????
10
??B?????????????
  • ??B???????????????Ig????,?????????
  • ?????(activation) ,
  • ??(proliferation),
  • ????(terminal differentiaion).

11
TD ? ? ? ? ? ? ? ? ? ? ? ? ? The Process of
Humoral Responses Induced by TD Antigen
Th ???????
Th
Bm
B7
CD28
Th
Th
CD4
???
MHC-II TCR
ICAM LFA-1
APC
??????
B
Th
CD40L CD40
BCR
??
B ????
12
??B????????????
  • ????????T????????B??????????,????,??????????????
    ???

  • ??????

  • ????FDC??

13
? ? ? ?
??????
????
???????? ??MØ?FDC ????????
??????
B?? ??
??
????
??
???
14
??B????????????
  • ?????????B?????????B????????T?????,B???????,??????
    ????????????????????????Ig??????B????????

15
  • (?)???????
  • V(D)?J????????????,???????????V(D)J????,????,?????
    ???????????????????
  • ?????????V (D)J????????B????????????????

16
  • (?)?????????Ig?????
  • 1g?????????????????????????????????????
    ????B??.?????????,???????Th???????,???????????????
    ????

17
B???????????? IgV????????????? IgV?????????????
?? ???????????BCR?B?? ????BCR?B???????? ???????
??????????
18
  • (?)Ig?????
  • B???IgV???????,???????????IgV??,?Ig
    C??(?????)????????????????????????????

19
B ? ? ? ? ? ? ? ? ? ? ?
20
  • (?)??B?????
  • ??????????B??,?????????,????????????????
    B???????????????B?????Ig,????????????????,????????
    ?Ig?

21
???B?? Memory B cells
  • ??
  • Bm?????????????,?????????????????IgG
  • ???????,??Th??
  • ?????????????

22
??? B???TI???????
  • ?????Ab????
  • ???Bm???
  • 1 ?TI???TD?????

23
B ? ? ? ? ? ?
CD28
IL-5
IgM
B7-2
?? (C3b,C4b )
FcmR
IL-2
CD40
CD40-L
CD23
CD32
IgE
BCR
IgG
??
CD21
IL-4
?? (C3bi )
24
TI???TD??TI Antigen and TD Antigen
  • TI ?????Th???????
  • TI-1????,???BCR??????
  • ??
  • TI-2??????????B????,??BCR???
  • TD???????,??Th?????

25
TI ? TD ? ?
TI-1 ??
TD ??
CD4
2
1
1
2
CD40/CD40L
B2 ??
B1 ??
Th??
26
TI-1 ? TI-2 ? ?
TI-1 ??
TI-2 ??
LPS
?????
LPS ??
????
????
B ??
27
2 ???Bm???
Plasma cells
Ig
sIg
Ig
Bm
28
TD ? ? ? ? ? ? ? ? ? ? ? ? ? The Process of
Humoral Responses Induced by TD Antigen
Th ???????
Th
Bm
B7
CD28
Th
Th
CD4
???
MHC-II TCR
ICAM LFA-1
APC
??????
B
Th
CD40L CD40
BCR
??
B ????
29
??? ?????????Chracteristics of Humoral
Responses
  • 1???????(Primary Humoral Response)
  • ???????????TD???,?????
  • ?????????
  • ?? ???6-10?
  • ????????IgM,???IgG??
  • ????????,??????

30
  • 2???????(Secondary Humoral Response )
  • ??????????????????? ??,????????????????
  • ?? ???4-5?
  • ???IgG??
  • ????
  • ?????,??????

31
??????????? Primary and Secondary Humoral
Response
????
????
100000 10000 1000 100 10 1 0
???????????(Log)
????
????
IgG
IgM
0 7 14 21 28 35
42
? ?
32
? ? ? ? ? ? ? ? ? ? ?
?C??
A B C D E
?C??
Bm??
Bm??
33
???? C ?????????
??????
???? C ?????????
???? B ?????
? ?
??C ??B
??C??
??
34
TI ???????????
????
????
100000 10000 1000 100 10
1 0
???????????(Log)
IgM
0 7 14
21 28 35
42
? ?
35
  • ??
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