In vitro megakaryocyte colony formation in patients with idiopathic thrombocytopenic purpura: differences between acute and chronic ITP.
In vitro megakaryocyte colony formation from the bone marrow of patients with acute idiopathic thrombocytopenic purpura (ITP) or chronic ITP was compared using a plasma clot system. The number of megakaryocyte colony-forming units (CFU-Meg) was significantly higher (p less than 0.05) in acute ITP compared to chronic ITP (54.3 +/- 68.4 vs. 12.9 +/- 15.3/10(5) nonadherent mononuclear cells, mean +/- SD), and significantly lower (p less than 0.05) in chronic ITP compared to controls (12.9 +/- 15.3 vs. 22.8 +/- 15.9). A significant correlation was observed between platelet recovery 7 and 30 days after culture, and the number of CFU-Meg (r = 0.49 and 0.45, respectively, p less than 0.05). An inverse correlation was observed between platelet count at the time of culture and the number of Megs per colony (r = -0.48, p less than 0.05). These results indicated a difference between acute and chronic ITP in the ability to promote in vitro Meg colony formation and may suppose a different immune mechanism for thrombocytopenia in these two disorders.
Abgrall
J F
JF
Department of Hematology, Hôpital A. Morvan, Brest University, School of Medicine, France.
el-Kassar
N
N
Berthou
C
C
Renard
I
I
Cauvin
J M
JM
Le Pailleur
A
A
Autrand
C
C
Sensebe
L
L
Guern
G
G
Zilliken
P
P
D000208:Acute Disease; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008297:Male; D008533:Megakaryocytes / Q000276:immunology*; D008875:Middle Aged; D016553:Purpura, Thrombocytopenic, Idiopathic / Q000276:immunology*; D013234:Stem Cells