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Journal of Virology, February 2003, p. 2251-2257, Vol. 77, No. 3
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.3.2251-2257.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Frequency and Phenotype of Circulating V24/Vß11 Double-Positive Natural Killer T Cells during Hepatitis C Virus Infection

Michaela Lucas,¹ Stephan Gadola,² Ute Meier,³ Neil T. Young,⁴ Gillian Harcourt,¹ Anastasios Karadimitris,² Nikki Coumi,¹ Dave Brown,⁵ Geoff Dusheiko,⁵ Vincenzo Cerundolo,² and Paul Klenerman^1*

Peter Medawar Building for Pathogen Research,¹ Weatherall Institute of Molecular Medicine, Nuffield Department of Medicine,² University of Oxford, and Nuffield Department of Surgery, John Radcliffe Hospital, Oxford,⁴ The Edward Jenner Institute for Vaccine Research, Compton,³ Centre for Hepatology, Royal Free Hospital, London, United Kingdom⁵

Received 2 July 2002/ Accepted 26 October 2002

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Natural killer T (NKT) cells are thought to be involved in innate responses against infection. We investigated one specific type of NKT cell, V24/Vß11 double positive, in hepatitis C virus (HCV) infection. Lower frequencies of this population were detected in the blood of HCV PCR-positive patients than in controls. Unlike V24/Vß11 NKT cells found in blood, those in the liver appeared to be recently activated.

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Hepatitis C virus (HCV) readily sets up persistent infection in the liver (17). A proportion of those infected control virus spontaneously, and host cellular immune responses are thought to play a key role in this (4). Although much work has focused on the role of conventional antigen-specific T-cell responses, less is known about the role of other lymphocyte subsets, including innate responses (6, 30). A variety of natural killer T (NKT) cells exist with different definitions. Here we focus on a readily defined set of these cells that coexpress V24 and Vß11. In a previous study, the V24/Vß11 double-positive NKT cells were found to overlap almost completely with the cells binding a CD1d--galactosylceramide tetramer (14). It is important to note, however, that other CD1d-restricted NKT-cell subsets also exist (1, 2, 8, 9, 31), and other groups have used other markers (such as CD161) or combinations (such as CD3⁺ CD56⁺) to identify different subsets that have also been described as "NKT." We have previously shown that V24/Vß11 double-positive NKT cells are readily detectable in the livers of patients infected with HCV by using either CD1d-glycolipid tetramers (14, 19) or, equivalently, T-cell receptor alpha (TCR-) and -ß-chain-specific antibodies (V24 and Vß11, respectively). This simple, readily available combination of antibodies was thus used in the present study.

NKT cells were initially identified in mice, where a variety of different markers have been used to define them (unlike in humans, where a pair of TCR antibodies is available), although a specific subset is known to be V14 positive (15, 29). However, importantly, the same CD1d-glycolipid tetramer recognized by human V24/Vß11 double-positive cells is recognized in the mouse (2). In murine systems, such NKT cells have been shown to express high levels of cytokines, both pro- and anti-inflammatory, upon stimulation (5, 10, 27). As a result, a role for such cells has been proposed in immunoregulation, autoimmunity, transplant rejection, tumor immunity, immunopathology, and immunity against infection (10, 13, 25, 26, 28). Similar functions have been proposed for human V24/Vß11 double-positive NKT cells (10, 16, 22, 23). Little is known about their role in chronic infection, although recent studies of human immunodeficiency virus infection noted that such cells (which can express CD4) were present at reduced frequencies (20, 24, 32). Here, we investigated V24/Vß11 double-positive NKT-cell responses in a cohort of subjects currently or previously infected with HCV and assessed the frequency and phenotype of these cells in the presence or absence of virus, focusing on markers relating to activation and function.

For the analysis of NKT-cell frequencies, HCV-seropositive patients were selected at random from a cohort of patients described previously (18). Forty-seven patients were studied, of whom 23 were consistently PCR negative and 24 were consistently PCR positive. Of the PCR-negative patients, 12 of 23 had previously received therapy (alpha interferon [IFN-]-ribavirin combination for 6 to 12 months), and of the PCR-positive patients, 10 of 24 had received therapy.

Peripheral blood mononuclear cells (PBMCs) were obtained from patients by centrifugation over Lymphoprep (Nycomed, Oslo, Norway) and stained with monoclonal antibodies (MAbs)specific for TCR V24 and Vß11 (Serotec, Ltd., Oxford, United Kingdom) that were either directly conjugated to phycoerythrin (PE) or fluorescein isothiocyanate (FITC) or biotinylated and used in combination with steptavidin-PerCP (SA-PerCP; Becton Dickinson, Franklin Lakes, N.J.). These stains were combined with FITC- or allophycocyanin (APC)-conjugated antibodies for phenotypic analysis (anti-CD3, CD161, CD4, CD8 , CD94, CD45RO, CD57, CD27, CD28, CD62L, CD69, CD38, CD25, Ki67, and perforin [all from Becton Dickinson]). Unconjugated antibodies such as anti-CCR7 (Becton Dickinson) and anti-LIR were combined with a secondary goat anti-mouse immunoglobulin conjugated to FITC (Dako, Ltd., Glostrup, Denmark). A mixture of PE-coupled KIR-specific MAbs consisting of the anti-KIR reagents EB6 (anti-KIR2DL1 and anti-KIR2DS1; Coulter, Hialeah, Fla.), DX27 (anti-KIR2DL2/L3 and anti-KIR2DS2), DX9 (anti-KIR3DL1), and DX31 (anti-KIR3DL2) were used to screen for the expression of KIR surface expression. All of the DX antibodies were manufactured by DNAX (Palo Alto, Calif.). HPF1 (anti-ILT2/LIR1) was kindly provided by Miguel Lopez-Botet. Preparation of intrahepatic mononuclear cells for fluorescence-activated cell sorter (FACS) analysis and antibody staining was performed as previously described (14). Because of the low frequency of V24/Vß11 double-positive T cells in some of the patients, a minimum of 500,000 cells was acquired.

Previous studies have often defined NKT cells by use of V24 staining alone (30). Therefore, we first identified the optimal methods of staining with TCR antibodies to provide an accurate equivalent to tetramer staining (14). As suggested in a previous study (14), expression of V24 on Vß11-positive lymphocytes was approximately 1 log higher than that on single-positive cells (Fig. 1a). This distinct pattern of staining was observed in both normal controls and seropositive patients across all subjects studied (Fig. 1b). Figure 1b illustrates the mean fluorescence intensity of staining for V24 in double- and single-positive cells (left panel) in 18 subjects; in this group, a mean 7-fold difference was seen in staining intensity (range, 2- to 10-fold; P < 0.0001). The levels of expression of Vß11 were not statistically different between single- and double-positive cells (Fig. 1b, right panel). Therefore, these cells possess high levels of surface V TCR as assessed by antibody binding, a result that is distinct from the murine model, where they are classically V TCR intermediate (2). The reason for this apparently high level of V24 without an increased level of Vß11 is not yet clear. It is possible that it relates to an increased affinity of the antibody for the specific V24JQ used by V24/Vß11 double-positive NKT cells. In practical terms, studies relying on V24 staining alone may overestimate the numbers of double-positive NKT cells, unless V24 high cells are carefully distinguished.

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FIG. 1. Distinctive staining pattern of NKT cells. (a) Example of staining of PBMCs for V24 and Vß11 expression. (Left panel) PBMCs were stained with directly conjugated antibodies for TCR V24 and Vß11 (PE and FITC conjugates, respectively). All cells displayed fall within the livelymphocyte gate. This stain example is from a representative HCV-seropositive PCR-negative patient, but similar patterns were seen in PCR-positive and control individuals. (Right panels) The top plot shows cells that fall within the V24/Vß11 double-positive gate, which were then analyzed for expression of CD3 and CD56. (PerCP- and APC-conjugated antibodies, respectively, were used.) The bottom plot shows equivalent staining for cells lying in the V24 single-positive gate. Note that the CD3 levels are identical in both gates. A higher proportion of CD3 cells in the top plot express CD56, but this still represents only a minority of the total population. (b) Comparison of V24 expression on single-positive and V24/Vß11 double-positive cells. (Left panel) Cells stained exactly as in panel a were examined in 21 patients of the study cohort. The mean fluorescence intensity of the V24 staining was compared within individuals in the single- and double-positive subsets. (Right panel) Cells of the same cohort were stained exactly as for panel a above, and the level of Vß11 expression was analyzed in single-positive and Vß11/V24 double-positive subsets. (c) Comparison of frequencies of V24/Vß11 double-positive cells and CD3+ CD56+ cells in controls and seropositive patients. (Left panel) Cells were prepared and stained for V24/Vß11 as described above and as illustrated in panel a. The frequencies of double-positive cells are displayed. PCR+ and PCR- represent two groups of HCV-seropositive patients who are viremic and nonviremic, respectively, while controls are HCV-seronegative healthy donors. The frequencies were compared by using an unpaired t test, with the means for each group indicated by a horizontal bar. Significant differences between the different groups are indicated as P values. No significant difference was seen between healthy controls and HCV-seropositive but nonviremic patients. (Right panel) Equivalent comparison between groups for frequencies of CD3+ CD56+ cells (also described as natural T cells). No significant differences were seen.

By these criteria, analysis of NKT frequencies in PBMCs revealed a range of frequencies in normal individuals of 0.01 to 0.14% of PBMCs, and a similar range was seen in our HCV-seropositive cohort (mean, 0.035% of lymphocytes). However, as illustrated in Fig. 1c, those subjects who were persistently viremic (PCR positive) were found to possess significantly lower levels of NKT cells than PCR-negative patients (mean, 0.014%; P = 0.002). This result was independent of previous treatment (data not shown). The frequencies varied little over time—repetitive analysis of a subset of the normal controls revealed consistent staining patterns over a 12-month period (data not shown). We analyzed a set of relevant controls. First, V24 single-positive frequencies were similar in PCR-positive (mean ± standard error [SE], 0.3857 ± 0.0199) and PCR-negative (mean ± SE, 0.3657± 0.0181) patients. Second, frequencies of CD3⁺ CD56⁺ cells (also described as "NT," for "natural T" cells) (7), which may also play a role in hepatic inflammation and immunity, were also not significantly different between PCR-positive (mean ± SE, 4.335 ± 4.202) and PCR-negative patients (mean ± SE, 3.446 ± 3.458) or normal controls (mean ± SE, 5.222 ± 4.094) (Fig. 1c). Thus, the changes in V24/Vß11 double-positive cell frequencies appeared to be specific for this particular subset.

In terms of cell surface markers, the NKT phenotype was CD3⁺, with no differences in level between single- and double-positive cells, CD4^- CD8^- cells, or CD4⁺ cells as previously described (2, 10, 27). They expressed classical markers of T-cell memory (CD45RO high, L-selectin low, CD28 high, CCR7 low) (Fig. 2), they were generally low in markers of activation (MHC class II low, CD38 low [although variable in some cases], CD69 low, and CD25 low), and they were not in cycle and lacked intracellular perforin (intracellular Ki67 and perforin low). As expected, the NKT (V24/Vß11 double positive) population was high for the marker CD161, although staining did not reach 100%. Interestingly, the NKT population defined by double-positive TCR antibody (or tetramer) staining was low in expression of KIRs, although some expression of ILTs was observed.

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FIG. 2. Comprehensive phenotyping of V24/Vß11 double-positive NKT cells in patients and controls. Three to six HCV-seropositive patients were stained for each specific marker, using those patients with sufficiently large ex vivo clouds of double-positive cells (generally >0.05% of lymphocytes) on flow cytometric analysis to provide accurate phenotyping. Significant differences between patients and controls in the double-positive NKT subset were present only for CD8 staining (P < 0.05). The data show the staining characteristics of both double-positive NKT cells (left panel) and, for comparison, V24 single-positive T cells (right panel). The data are split into T-cell subset markers (a), NK markers (b), T-cell memory markers (c), and lymphocyte activation/function markers (d).

The V24/Vß11 double-positive cell phenotype in HCV-seropositive individuals did not differ markedly from that of normal controls. Some minor variations in, for example, CD8 CD4 expression were noted, but no excess expression of activation markers such as CD69 or change in KIR expression was observed (Fig. 2b and d). The surface phenotype of V24 single-positive cells was distinct from that of V24/Vß11 double-positive NKT cells. In particular, the single-positive cells showed lower expression of CD161 and higher expression in CD62L and CCR7 (Fig. 2b, c, and d).

Explanations for the lower levels of NKT cells identified in HCV infection may be the down-regulation of TCRs as a result of activation, apoptosis of NKT cells through a similar process, and/or compartmentalization into peripheral organs, including the liver. In murine models, activation of V14 single-positive NKT cells by -galactosylceramide leads to initial cytokine release and then to a sustained reduction specifically in the liver (13). To investigate this specific possibility, we phenotyped hepatic NKT cells by techniques described previously (14) in two HCV PCR-positive individuals. Again in both cases, V24/Vß11 double-positive cells showed high V24 expression, although this was not readily apparent in a previous study (14). These populations were highly activated, as defined by high expression of CD69 (Fig. 2c). CD69 is a marker of recent activation on lymphocytes, including NKT cells (3). These data suggest that NKT cells can be activated within the hepatic compartment, because the level of CD69 was uniformly low on all NKT populations identified in PBMCs (Fig. 2d and 3) (11, 21). Further studies are required to assess whether this activation is disease related.

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FIG. 3. Phenotype of circulating and intrahepatic V24/Vß11 double-positive NKT cells. (a) Phenotype of circulating NKT cells. PBMCs from one representative PCR-negative patient were stained with a directly conjugated antibody specific for TCR V24 and a biotinylated antibody to TCR Vß11 in combination with SA-PerCP. PBMCs were costained with antibodies to CD69 or CD45RO. The histograms show the phenotype of cells falling into the V24/Vß11 double-positive gate. (The gate is indicated, as is the frequency of V24/Vß11 double-positive cells.) (b) Activated phenotype of intrahepatic NKT cells. Intrahepatic lymphocytes from two HCV-seropositive PCR-positive subjects (P3 and P5) were stained with directly conjugated antibodies specific for V24/Vß11 TCR and costained with antibodies to CD69 or CD45RO. The histograms indicate the phenotype of cells falling into the V24/Vß11 double-positive gate. (The gate is indicated, as is the frequency of V24/Vß11 double-positive cells.)

V24/Vß11 double-positive NKT cells may exert antiviral or immunoregulatory function in the liver, although the physiological mechanism involved in their activation in response to viral infection has yet to be determined (6, 10, 12, 30). In murine models, activation by administration of -galactosylceramide in vivo leads to a release of gamma interferon (IFN-) and suppression of hepatitis B virus (HBV) (13). It is likely that the cells activated within the liver subsequently undergo apoptosis as opposed to local proliferation.

It is crucial that, in future studies, the population of NKT cells remains tightly defined. Our findings suggest that the frequency of V24/Vß11 double-positive NKT cells (but not CD3/CD56 double-positive cells or V24 single-positive cells) in the PBMC fraction is lower in the presence of circulating virus (PCR positive) than in normal individuals and PCR-negative seropositive patients. It is possible that continuous activation and subsequent apoptosis are responsible for this decrease in frequencies, akin to exhaustion of CD8⁺ T cells, but many other mechanisms are possible, including disturbance of generation through modulation of CD1d or ligand or disturbance of homeostatic cytokines. Further analysis of the function of these cells and studies of intrahepatic phenotype and distribution are clearly important. While it is not generally required, as we have previously demonstrated, to use CD1d tetramers in humans, combination TCR antibody staining is nevertheless important in both blood and tissue sites, because the frequencies, phenotypes, and presumably functions of Va24 single- and V24/Vß11 double-positive cell subsets are discrete (9, 14). In future studies, it should also be borne in mind that the tight relationship between V24/Vß11 double-positive cells and CD1d tetramer-positive cells seen in this situation may potentially vary in different disease states and sites. This study indicates that persistent HCV infection influences the host V24/Vß11 double-positive NKT response. However, how that response influences the virus is still an open question.

 
We are grateful to the Wellcome Trust and the EU (QLK2-CT-1 999-00356) for financial support.

We thank Scott Ward and Andrew Lucas for critical reading of the manuscript, Simon Hellier and Rodney Phillips for support in the laboratory, and Jane Collier and John Sullivan for very helpful ongoing collaborations and discussions.

 
* Corresponding author. Mailing address: Nuffield Department of Medicine, Peter Medawar Building for Pathogen Research, University of Oxford, South Parks Rd., Oxford OX1 3SY, United Kingdom. Phone: 44-1865-281885. Fax: 44-1865-281236. E-mail: klener{at}molbiol.ox.ac.uk.

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Journal of Virology, February 2003, p. 2251-2257, Vol. 77, No. 3
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.3.2251-2257.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

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