Effect of tuftsin stimulation on the microbicidal activity exerted by blood monocyte-macrophages of leprosy patients.


The ability of blood monocyte/macrophages from normal donors, tuberculoid leprosy (BT/TT) and lepromatous leprosy (BL/LL) patients to exert enhanced microbicidal activity was assayed after stimulating with 0.8 microM tuftsin, as a function of the duration of cultures in vitro. Normal and BT/TT macrophage cultures showed a statistically significant increase in microbicidal activity against Staphylococcus aureus at all ages of culture (6 h to 14 days), though the overall magnitude of the enhancement shows a decrease with increasing culture age in the same populations. However, 14-day old BL/LL macrophage cultures were unable to undergo tuftsin-mediated stimulation of microbicidal activity against S. aureus and even, fresh 6 h-old cultures exhibited a tuftsin-stimulated response profile similar to 14-day old normal and BT/TT cultures. Also, 7 and 14-day cultures of normal, BT/TT and BL/LL macrophages were unable to inhibit/kill intracellular Mycobacterium leprae after a single stimulation with 0.8 microM tuftsin. However, serial, daily stimulation with 0.8 microM tuftsin resulted in 77-140% inhibition of 3H-thymidine uptake by the 12th day of cultures in vitro in the three groups. These results suggest that BL/LL macrophages exhibit a premature inability to undergo tuftsin stimulated microbicidal activity, which may possibly be reversed by serial dosage of tuftsin.


Citations per Year

201 Citations

Semantic Scholar estimates that this publication has 201 citations based on the available data.

See our FAQ for additional information.

Cite this paper

@article{Iyer1990EffectOT, title={Effect of tuftsin stimulation on the microbicidal activity exerted by blood monocyte-macrophages of leprosy patients.}, author={Ramya Radhakrisham Iyer and Hanumanthappa Krishna Prasad and Lalit K. Bhutani and Donthamshetty Nageswara Rao}, journal={International journal of immunopharmacology}, year={1990}, volume={12 8}, pages={859-69} }