, Volume 2, Issue 1, pp 21–32 | Cite as

Comparison between crude Interleukin-2 and recombinant Interleukin-2 in maintaining killing activity of cultured lymphocytes

  • Masaki Nakanishi
  • Norimichi Kan
  • Takashi Okino
  • Kohei Satoh
  • Keiichi Mise
  • Yasufumi Teramura
  • Seiji Yamasaki
  • Kazuhisa Ohgaki
  • Takayoshi Tobe


Peripheral blood lymphocytes, regional lymph node lymphocytes or malignant effusion lymphocytes from cancer patients were incubated with crude IL-2 (cIL-2) for 13 days. These effectors, which frequently expressed IL-2 receptor (IL-2R), proliferated well and possessed augmented killing activity against fresh autologous tumor cells and K562. However, when recombinant IL-2 (rIL-2) was added for the last 4 days of culture instead of cIL-2, IL-2R expression and killing activity against fresh autologous tumor cells decreased significantly (P<0.05). Phenotypic analysis indicated that cIL-2 significantly promoted the expansion of the cytotoxic population (CD8+ .11b)(P<0.05). The decreases in killing activity and IL-2R expression were restored by 0.004% PHA plus rIL-2, but not in the presence of rIFN-γ, rIL-1α, rIL-lβ, rIL-4 or rIL-6. PHA-free cIL-2 maintained killing activity, but not IL-2R expression.

We conclude that some factors in cIL-2 and a low dose of PHA-P are necessary for the maintenance of killing activity and IL-2R expression of cultured lymphocytes in the late phase of culture.

Key words

crude Interleukin-2 recombinant Interleukin-2 killing activity IL-2 receptor expression 





crude IL-2




cytotoxic T lymphocytes


IL-2 receptor


Jurkat Unit


lymphokine activated killer


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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Masaki Nakanishi
    • 1
  • Norimichi Kan
    • 1
  • Takashi Okino
    • 1
  • Kohei Satoh
    • 1
  • Keiichi Mise
    • 1
  • Yasufumi Teramura
    • 1
  • Seiji Yamasaki
    • 1
  • Kazuhisa Ohgaki
    • 1
  • Takayoshi Tobe
    • 1
  1. 1.Laboratory of Oncologic Surgery, First Department of SurgerySchool of Medicine Kyoto UniversityKyotoJapan

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