Inhibition of cytokine activation processes in vitro by tenidap, a novel anti-inflammatory agent.

Abstract:

:Tenidap is a novel anti-inflammatory and anti-arthritic agent that lowers intracellular pH and suppresses anion transport when applied to cells in vitro. Both of these parameters are known to influence pro-inflammatory cell function. To investigate whether tenidap can modulate cellular responses to cytokine stimulation, several in vitro cytokine-driven assays were characterized with respect to their tenidap sensitivity. Human monocytes treated with granulocyte-macrophage colony stimulating factor (GM-CSF) demonstrated an increased production of IL-6 as well as an increased total translational activity. Tenidap dose-dependently inhibited both cytokine-induced responses; the effect on IL-6, however, occurred at lower tenidap concentrations than those required to prevent the increase in total translational activity. In contrast, the known translational inhibitor cycloheximide did not demonstrate selectivity for IL-6; this agent decreased the GM-CSF-induced increase in total translational activity in parallel with its effects on IL-6. GM-CSF-treated monocytes also produced greater amounts of IL-1 beta in response to LPS stimulation than did non-GM-CSF-treated cells, and tenidap again suppressed this cytokine-induced activation. Human Hep3B cells treated with a combination of interleukin (IL)-1 beta and IL-6 demonstrated an acute phase-type of response. These hepatoma cells increased production of the positive acute phase protein serum amyloid A (SAA) while they decreased production of a negative acute phase protein human serum albumin (HSA). Tenidap dose-dependently inhibited the cytokine-induced increase in SAA production without effecting synthesis of HSA or total TCA-precipitable macromolecules. Importantly, the ability of tenidap to alter these various cytokine responses was not shared with piroxicam, a potent cyclooxygenase inhibitor. Finally, human neutrophils treated with either GM-CSF or tumor necrosis factor (TNF)-alpha demonstrated an increased chloride conductance as measured by the loss of radioactive chloride from 36Cl-loaded cells. When tenidap was included within the medium during cytokine stimulation, loss of radioactive chloride was prevented. Thus, tenidap inhibited the cytokine-induced increase in anion transport. Together, these results indicate that tenidap can suppress cellular activation processes induced by a variety of cytokines. This functional antagonism is not dependent on cyclooxygenase inhibition but, rather, appears to link to tenidap's unique ability to alter ionic homeostasis. These in vitro observations, therefore, may help to explain how this novel anti-inflammatory agent acts to lower acute phase proteins and IL-6 levels in man.

journal_name

Cytokine

journal_title

Cytokine

authors

McNiff PA,Laliberte RE,Svensson L,Pazoles CJ,Gabel CA

doi

10.1006/cyto.1995.1027

subject

Has Abstract

pub_date

1995-02-01 00:00:00

pages

196-208

issue

2

eissn

1043-4666

issn

1096-0023

pii

S1043-4666(85)71027-7

journal_volume

7

pub_type

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