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Activation of Tumor Necrosis Factor-α System in Chronic Hepatitis C Virus Infection

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Abstract

Tumor necrosis factor-α (TNF-α)plays a central role in the host's immunomodulatoryresponse to infective agents. To evaluate theTNF-α system in patients with chronic hepatitis Cvirus (HCV) infection, plasma, serum, and peripheral bloodmononuclear cells (PBMC) were prospectively collectedfrom 53 patients and 33 healthy control subjects.Circulating TNF-α and TNF receptors were assayed by their respective enzyme immunoassays. Inaddition, TNF-α mRNA was quantitated in PBMC usinga branched DNA assay, and production of TNF-α byPBMC with and without lipopolysaccharide was also assessed. Patients with chronic HCV infectionhad a higher level of circulating TNF-α comparedto healthy control subjects (9.62 ± 6.01 vs 3.66± 1.23 pg/ml, P < 0.001). They also had highercirculating levels of TNF receptors compared to control(CD120a: 3323 ± 1267, pg/ml, N = 49 vs 1855± 422 pg/ml, N = 33, P < 0.001; CD120b: 1290± 650 pg/ml, N = 51, vs 863 ± 207 pg/ml,N = 33, P < 0.001). Plasma TNF-α level correlated with circulatingCD120a (r = 0.52, N = 49, P < 0.001) and weakly withCD120b (r = 0.32, N = 51, P = 0.02). Plasma TNF-αalso correlated with markers of hepatocellular injury, including ALT (r = 0.34, N = 53, P = 0.01) andα-GST (r = 0.31, N = 43, P = 0.042), but not withserum HCV RNA levels. There was no difference in theTNF-α mRNA levels in PBMC between patients with chronic HCV infection (1.4 ± 1.9units/106 cells, N = 8) and healthy control subjects(2.1 ± 1.4 units/106 cells, N = 8, P = NS). Therewas also no difference in the spontaneous production ofTNF-α by PBMC (1 × 106 cells/ml)between patients with chronic HCV infection (14.2± 36.5 pg/ml, N = 11) and healthy subjects (11.9± 14.0 pg/ml, N = 14, P = NS). However, patientswith chronic HCV infection produced more TNF-α upon stimulation withlipopolysaccharide compared to healthy control subjects(1278 ± 693 pg/ml, N = 11, vs 629 ± 689pg/ml, N = 14, P < 0.05). These data indicate thatthe TNF-α system is activated in patients with chronicHCV infection.

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Authors
  1. David R. Nelson
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  2. Herbert L. Lim
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  3. Constantine G. Marousis
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  4. Jane W. S. Fang
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  5. Gary L. Davis
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  6. Luping Shen
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  7. Mickey S. Urdea
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  8. Janice A. Kolberg
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  9. Johnson Y. N. Lau
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Nelson, D.R., Lim, H.L., Marousis, C.G. et al. Activation of Tumor Necrosis Factor-α System in Chronic Hepatitis C Virus Infection. Dig Dis Sci 42, 2487–2494 (1997). https://doi.org/10.1023/A:1018804426724

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