Immunoregulation by blasts from null cell and T‐cell leukemias: Help and suppression of T‐cell proliferative responses to mitogens Academic Article Article uri icon


MeSH Major

  • Depression
  • Schizophrenia


  • The immunoregulatory activity of bone marrow leukemic blasts from five patients with null-cell acute lymphoblastic leukemia (ALL) and two children with T-cell ALL was evaluated. Blasts were studied in co-culture for their effects on the proliferative responses of normal allogeneic peripheral blood lymphocytes to phytohemagglutinin. Mitomycin C-treated null cell ALL blasts from two of five children suppressed the proliferative responses of normal responder cells by 80% and 58% whereas those from two other children enhanced the responses by 118% and 31%. T-cell leukemic blasts from one patient with T-cell ALL exhibited helper cell activity (26%) and T-leukemic blasts from the other demonstrated suppressor cell activity (53%). The helper cell activity of leukemic blasts was associated with stimulating capacity of null blasts in one-way mixed lymphocyte reactions. In six of seven cases, incubation of blast cells with concanavalin A (20 microgram/ml) for 48 hours prior to co-culture with responder cells did not result in the generation of significant suppressor cell activity. Our study suggests that leukemic blasts from certain patients with 'null' and T-cell ALL may possess spontaneous helper or suppressor cell immunoregulatory activity. This functional heterogeneity of leukemic blasts may help in subclassifying the ALL.

publication date

  • January 1982



  • Academic Article


Digital Object Identifier (DOI)

  • 10.1002/1097-0142(19820101)49:1<43::AID-CNCR2820490111>3.0.CO;2-S

PubMed ID

  • 6459155

Additional Document Info

start page

  • 43

end page

  • 7


  • 49


  • 1