From www.bloodjournal.org by guest on February 6, 2015. For personal use only. Double-Negative (CD4 - CD8 - ) T Cells From Adult T - c e l l Leukemia Patients Also Have Poor Expression of the T - c e l l Receptor ap/CD3 Complex By Hitoshi Suzushima, Norio Asou, Shintaro Nishimura, Kouji Nishikawa, Jian-xiang Wang, Toshiya Okubo, Makoto Naito, Toshio Hattori, and Kiyoshi Takatsuki W e present four patients with adult T-cell leukemia (ATL) derived from a novel T-cell subset (CD4-, CD8- [doublenegative, DN], T-cell receptor [TCR] &). In the ATL cells of these patients, neither gene nor surface expression of CD4 and CD8 antigens was detected. Clinical and laboratory data showed no difference between DN-ATL and CD4+ATL patients. In contrast to typical CD4+ATL cells, DN-ATL cells were shown to express the protein and messenger RNA (mRNA) for S1 OO@ in immunocytochemical assay and the reverse-transcription polymerase chain reaction assay. The mean fluorescence intensity of the TCR/ CD3 complex was extremely low in all four DN-ATL patients as well as in typical CD4+ ATL. All four patients had TCR @ and y chain gene rearrangements, with deletion of TCR 6 chain gene and mRNA expression for TCR a , @, and CD3 6 but not for TCR y and 6 chain genes. Thus, CD4- CD8TCR a@T cells are also a target for human T-cell lympho- A mice23-27 and these lymphocytes have also been detected in the peripheral blood of patients with lupus nephritis." A human counterpart of the DN TCR a/3' lymphocyte has also been detected in normal peripheral bloodz9 and skin,30 although the biologic role of this subset has not yet been well characterized. We recently reported of a patient with DN-ATL, in whom leukemic cells proliferated in the gastrointestinal tract epitheli~m.~ In' vitro studies have shown that HTLV-I infects not only T cells but also B cells and monocyte^.^*-^^ However, HTLV-I-induced leukemic cells derived from CD4- T cells have not yet been fully characterized. In this report, we describe the clinical features and the results of TCR gene analysis in four patients with DN-ATL. DULT T-cell leukemia (ATL)'.' is etiologically associated with the human T-cell lymphotropic virus type I (HTLV-I).3.4By its diverse clinical features, ATL has been classified into acute, chronic, lymphoma, and smoldering types.' Most of the ATL cells found in any of these subtypes are derived from CD3+, CD4+, CD8-, T-cell receptor (TCR) ap' T cells, and they universally express activated T-cell antigens, such as HLA-DR and CD25,6although the expression level of HLA-DR in acute ATL cells is very low compared with that in chronic ATL cells.7 Diminished surface expression of the TCR/CD3 complex is also a striking feature of ATL cells.'-" TCR a and /3 chain expression by lymphocytes is associated with the expression of either CD4 or CD8, which are accessory molecules involved in major histocompatibility complex (MHC) class 11- or class I-restricted T-cell recognition, re~pectively.'~-'~ Most mature lymphocytes that lack CD4 and CD8 usually express the TCR yS hai in,'^-'^ which is not MHC-restricted.16 A few lymphocytes with the CD4-, CD8(double-negative[DN]) TCR ab+ phenotype have been found in the mouse t h y m ~ s , 'which ~ - ~ ~preferentially express TCR VpS family gene product^."^^^^^^ Accumulation of DN TCR ab' lymphocytes has been reported in the peripheral lymphoid organs of MRL/MP-lpr/lpr (Ipr) autoimmune From the Second Department of Internal Medicine and the Second Department of Pathology, Kumamoto University Medical School, Kumamoto; and The Institute for Virus Research, Kyoto University, Kyoto, Japan. Submitted May 27, 1992; accepted October 15, 1992. Supported by a grant-in-aid for ScientiJicResearchfrom the Ministry ofEducation, Science and CultureofJapan, and Science Research expensesfor Health and WelfareProgramsfrom the Ministry of Health and Welfare, Japan. Address reprints request to Hitoshi Suzushima. MD, Second Department of Internal Medicine, Kumamoto UniversityMedical School, 1-1-1Honjo, Kumamoto 860, Japan. The publication COSIS of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. section I734 solely to indicate this fact. 0 1993 by The American Society ofHematology. 0006-4971/93/8 I 04-0008$3.00/0 1032 tropic virus type I-induced leukemogenesis. In addition, expressionof the TCR 4 C D 3 complex on the DN-ATL cells was further diminished by the addition of anti-CD3 or antiTCR @. monoclonal antibody. These results suggest that the decreased expression of the TCR a@/CD3complex by ATL cells plays a key role in the development of ATL. irrespective of CD4 expression. 0 1993 by The American Society of Hematology. MATERIALS AND METHODS Patients and cell line. Cells from four patients with DN-ATL (three acute and one lymphoma type) were extensively studied. The disease of one of these patients (patient no. 4) was previously reported." The diagnosis of ATL was made by the detection of serum anti-HTLV-I antibody and the monoclonal integration of HTLV-I proviral DNA in leukemic cells.35Clinical subtyping was performed according to the previously described riter ria.^ Lymph node biopsy was performed after obtaining informed consent according to the guidelines of the Kumamoto University Medical School Committee for the Protection of Human Subjects. The human myeloid leukemia cell line (HL60), human T-cell leukemia cell lines (Jurkat and PEER), and ATL cell line (SKT-IB)" used in this study were cultured in RPMI 1640 medium supplemented with 10%heat-inactivated fetal calf serum (FCS), 2 mmol/L I-glutamine, 100 U/mL penicillin, and 100 pg/mL streptomycin. Cell preparation and phenotypic analysis. Peripheral blood mononuclear cells (PBMNC) were obtained from normal volunteers and the acute ATL by Ficoll-Conray density gradient centrifugation. Normal T cells were then prepared from PBMNC by rosette formation with sheep red blood cells (RBCs). Lymph node cells were obtained from lymphoma type ATL by passing lymph node biopsy specimens through a steel mesh. The following murine monoclonal antibodies (MoAbs) were used for indirect immunofluorescence assays: CD2 (OKTI I), CD3 (OKT3), CD4 (OKT4), and CDX (OKTX) (Ortho Diagnostics, Raritan, NJ); CD3 (Leu4), CD4 (Leu3a), CDX (Leu2a), and TCR a@ (WT3 1) (Beckton Dickinson Monoclonal Center, Mountain View, CA); HLA-DR (Nula) (Nichirei CO, Ltd, Tokyo, Japan); TCR y6 Blood, Vol81, No 4 (February 15). 1993: pp 1032-1039 From www.bloodjournal.org by guest on February 6, 2015. For personal use only. 1033 DN-ATL CELLS HAVE POOR TCR/CD3 EXPRESSION Table 1. Clinical Findings of Untreated Patients With DN-ATL ~ Patient No 1 2 3 4 Organ Involvement Clinical Subtype Age/Sex Sk Lu GI LN Lymphoma Acute Acute Acute 65/M 89/M 40/M 72/M - + - + + - - - - - + + - + - WBC (XlOS/L) LDH (UlL) Ca (mg/dL) Survival 7.2 19.2 41.8 17.1 647 1,949 1,812 4,103 9.2 11.7 11.0 9.5 13< 8 15 16 (mo) Normal ranges: WBC, 3.5 to 8.5; LDH, 130 to 250; Ca. 8.7 to 10.3. Abbreviations: Sk, skin; Lu. lung; GI, gastrointestinal tract; LN, lymph node; WBC, white blood cell count; LDH, lactic dehydrogenase. (TCR 61 and 6TCSI) (T Cell Science Inc, Cambridge, MA); and CD25 (anti-Tac; provided by Dr T. Uchiyama, Kyoto University). The cells were further incubated with fluorescein isothiocyanate (FITC)-conjugated goat F(ab)’, antimouse IgG (Sigma, St Louis, MO), and analyzed with a FACScan (Becton Dickinson Immunocytometry Systems). VAK5 (anti-p24 of human immunodeficiency virus type 1) was used as isotype-matched control Ab (IgG,) for WT3 1. PBMNC from three normal volunteers were simultaneously analyzed with OKT3 and WT31 as a control and the relative mean fluorescence intensity (MFI) was calculated as follows: MFI of the Antigen on Patient Cells x 100. Average MFI of the Antigen on PBMNC From the 3 Normal Volunteers Two-color analysis was performed using cells from patient no. 2, a FACStar (Becton Dickinson Immunocytometry Systems), and the following MoAbs: an FITC-labeled anti-CD4 MoAb (Nu-T,,,; Nichirei CO),an anti-CD25 MoAb (Cosmo Bio CO,Ltd, Tokyo, Japan), an anti-TCR a@ MoAb (TCR-I), a PE-labeled antLCD8 MoAb (LeuZa),an anti-CD4 MoAb (Leu3a; Becton Dickinson Monoclonal Center), and an anti-CD25 MoAb (Immunotech SA, Marseille, France). Terminal deoxynucleotidyl transferase (TdT) was detected with indirect immunofluorescenceassay using a Capi kit (Calpis Food Industries, Tokyo, Japan) according to the manufacturer’s instructions. TCR a@ was also examined with immunocytochemical staining using @F1(T Cell Science Inc). Peroxidase-antiperoxidase(PAP)staining technique with anti-S100 were performed on methanol-fixed PBMNC cytospin smears with an S lOO/PAP kit (DAKO Corporation, Carpinteria, CA). Southern and Northern blot analysis. DNA was prepared from the mononuclear cells of each patient by proteinase K digestion followed by phenol-chloroform extraction. The DNA was digested with restriction enzymes, subjected to electrophoresis on 0.7% agarose gels, and transferred to nitrocellulose filters (Hybond C extra; Amersham Intemational plc, Buckinghamshire, UK). The filters were hy- bridized with radiolabeled probes at 42°C for 12 hours, washed, and then exposed to x-ray film at -80°C. Total cellular RNA was isolated by ultracentrifugation on a guanidinium isothiocyanate/CsClz gradient. Ten micrograms of total RNA was subjected to electrophoresis on 1% agarose-formaldehyde denaturing gel, and was transferred to a nitrocellulose filter (Hybond C extra). Hybridization was then performed as described above. The following probes were used for Southern and Northern blotting: a 0.39-kb Hpa 11-Hpa I1 fragment of the Ca gene,36a 1.6-kb EcoRIEcoRI fragment of a Cy probe:’ a 1.5-kb EcoRI-EcoRI fragment of cDNA containing the C6-specific segment3*(provided by Dr T.W. Mak), a 3.0-kb HindIII-EcoRI fragment hybridizing to the CO1 gene, a 4.0-kb EcoRI-EcoRI fragment containing the J/32 gene39(provided by Dr H. Sakano), a 0.62-kb Pst I-Xho I fragment of the CD3 6 gene4’ (provided by Dr C. Terhorst), a 0.7-kb HindIII-EcoRI fragment hybridizing to the J y l gene4’ (provided by Dr T.H. Rabbitts), and a 1.5-kb Pst I-BamHI fragment of a CD8 probe4’ (provided by Dr P. Kavathas). The CD4 probe was synthesized from Jurkat cells by the reverse transcription-polymerase chain reaction (RT-ER). The 0.77kb NCOI-Taq I fragment of a p-actin probe was purchased from Oncor Inc43(Gaithersburg, MD). RT-PCR. Ten micrograms of cellular RNA was subjected to reverse transcription with 20 pmol 3’-specific primer and IO U avian myeloblastosis virus reverse transcriptase (Seikagaku Kogyo CO,Ltd, Tokyo, Japan) at 37°C for I hour. One tenth of each c-DNA sample was coamplified using a 5‘- and 3’-SlOOP primer at a final concentration of 0.2 pmol/L in each reaction. Amplification was performed with 2.5 U Taq polymerase (Thermus aquaticus DNA polymerase; Bethesda Research Laboratories Life Technologies, Inc, Gaithersburg, MD) in a Cetus/Perkin-Elmer thermocycler for 30 cycles under the following conditions: melting at 95°C for 30 seconds, annealing at 55°C for 30 seconds, and extension at 72°C for 1 minute. The 5’sense SlOO@ primer used was 5‘ TGC AGC AAG GAG ACC AGG AA 3’ (residues 33-52 in the first exon) and the 3’-antisense primer was 5‘ GAA CTC GTG GCA GGC AGT AG 3’ (residues 335-316 in the third exon)?4 After the reaction, one tenth of each sample was Table 2. Surface PhenotvDes of DN-ATL Cells Patient No. CD2 ( T I 1) 1 98 2 99 3 99 4 85 CD4 (OKT4) (Leu3a) 3 6 3 3 11 4 1 L CD8 (OKT8) (Leu2a) 8 7 2 7 9 2 0 1 CD3 (OKT3) 8 (1 4/700:2) 49 (58/730:8) 98 (104/650: 16) 89 (150/750:20) TCRag (WT31) TCRy6 (TCR61) (6TCS1) 5 15/145:10) 9 (30/151:20) 81 (39/140:28) 53 (59/155:38) 1 0 1 0 4 0 3 0 HLA-DR (Nu-la) CO25 (Tad TdT 10 95 0 6 36 0 9 9 0 14 92 0 Numbers are actual percentages of positive cells. Values in parentheses are MFl/nMFI:rMFI. Abbreviations: rMFI, relative MFI; nMFI, average MFI value of the amntigen on PBMNC from the three normal volunteers. From www.bloodjournal.org by guest on February 6, 2015. For personal use only. 1034 SUZUSHIMA ET AL tained at diagnosis are shown in Table 1. All patients were males aged 40 to 89 years. Three had acute ATL and the other lymphoma ATL. Proliferation of leukemic cells in the skin, lungs, and/or gastrointestinal tract was observed in three of the four DN-ATL patients. The morphologies of peripheral blood cells corresponded to that of typical ATL cells with convoluted and coarse nuclei. Two of the four DN-ATL patients had hypercalcemia, which is frequently observed in ATL.5All four patients received intensive chemotherapy and their survival did not differ from that of patients with CD4+ acute ATL.5 Immunophenotypic analysis. The results of phenotypic analysis of DN-ATL cells at diagnosis are shown in Table 2. More than 85% of the cells from all DN-ATL patients were CD2+and the cells from these patients were also CD4-, CD8-, and TCR 78- (less than 12%). Lack of CD4 or CD8 antigens was confirmed using two different MoAbs in each case (CD4, OKT4 and Leu3a; CD8,OKT8 and Leu2a). Two-color analysis showed that most of the CD25' cells of patient no. 2 were CD4- and CD8- (Fig I). Cells from three DN-ATL patients had CD25 antigens, whereas the expression of HLADR antigens on cells from any of the four patients was very low, a similar finding to typical acute CD4+ATL.' Cells from all three acute DN-ATL patients were CD3+, but the MFI values were extremely low compared with those for normal T cells. The lymph node cells from the lymphoma type DNATL patient were CD3-. Cells from two DN-ATL patients were TCR a@- (less than 10%). However, MFI value for TCR a@ in patient no. 2 as well as patients no. 3 and 4 was higher than those for VAKS, isotype-matched negative control Ab. Similar to the results for CD3 antigen expression, the MFI values for TCR a@ chain expression by DN-ATL cells were significantly decreased. These observations were confirmed by the expression of TCR a@ chain with the other MoAb, n . I 0 0 U U c D 2s c 0 25 Fig 1. Two-cdor immunofluorescence analysis of peripheral blood " n u c l e a r cells from an acute DN-ATL patient (patient no. 2). Cells were simultaneously analyzed with FITC- or PE-labeled MoAbs, as indicated beside each dot plot. The percentages of cells in each population are shown in the boxes. subjected to Southern blot analysis. The probes used for hybridization were 20-mer oligonucleotides derived from 3'-primers by S-juxtaposition and labeled by the Sendlabeling method. RESULTS ClinicalJieaturesand laboratory data of DN-ATL. 'The clinical and laboratory data of the patients in this study ob(0 0 ( 0 P a I -I 1 2 3 I 4 -10.5 CB1 J71 1 2 3 4 -- 18.5 13.5 -4.0 - 11.0 JB2 C6 Y - Y- - 4.0 kb kb Fig2. S o u t h e m h y b r i d i analysis of the TCR B (CB1 or 582)chain g e m in patients with DN-ATL using EcoRI-digested DNA. TCRr(J.rl) and 6 (a) chain genes were also analyzed using BemHI-digested DNA. HL60 DNA sewed as a control for the gennline configuration.The lane numbers correspond to the patient numbers listed in the tables. From www.bloodjournal.org by guest on February 6, 2015. For personal use only. 1035 DN-ATL CELLS HAVE POOR TCR/CD3 EXPRESSION TCR TCR -1.6 -1.3 e pF rwwwm=~- rp - 1.7 5 - 2.2 - - 1.5 a -1.3 1.0 kb E & Fig3. Northemhybrid*ation analysis of total cellular RNA from DN-ATL cells using constant region probes for the TCR a,B, 7, and 8 chain genes, the CD3 ti chain gene, and the CD4 and CD8 antigen genes. RNA from Jurkat, SKT-1B, and PEER cells sewed as the positive control. The lane numbers correspond to the patient numbers listed in the tables. 5 CD3 - ' * 6 /3FI. Over 90% of cells in patients no. 2 and 4 were reacted weakly with BFI. TdT was negative (less than 15%) in cells from all DN-ATL patients. TCR a, 8. y, and 6 chain gene rearrangements. To characterize further the TCR molecules in DN-ATL cells, we first examined the gene configuration of each chain of the TCR by Southern blot analysis. In patients no. 1 and 2, whose cells did not show surface expression of the TCR, the TCR /3 and y chain genes were rearranged, as they also were in patients no. 3 and 4 (Fig 2). The TCR 6 chain gene, which lies between the V a and Ja loci, showed biallelic deletion in all cases, suggesting that TCR a chain genes were assembled. The profile of rearrangements of the TCR /3 and y chain genes were different in each case (Fig 2). Expression of TCR. CD3 6. CD4, and CD8 genes. To verify whether the absent or decreased surface expression of TCR, CD4, and CD8 antigcns on DN-ATL cells was caused by a lack of gene expression, we examined the mRNA for these molecules by Northern blot analysis (Fig 3). Mature transcript.. for the TCR (Y and /3 chain genes were detected in DN-ATL, but TCR y and 6 chain mRNA could not be found in any of the DN-ATI, cells. CD3 d mRNA was also expressed in all cases. These results indicate that abnormal surface expression of the TCR/CD3 complex by DN-ATL cells was not caused by defective transcription of this complex. CD4 and CD8 mRNA were not detectable in any of the DNATL cells (Fig 3), confirming the lack of surface expression of these antigens. Effectofanri-CD3MoAb on sut$ace expression ofihe TCR/ CD3 complex. In CD4' ATL cells, expression of the TCR/ CD3 complex on the cell surface decreases following stimulation with anti-CD3 MoAb? To examine whether expres- 1 2 3 4 3.0 0.1 cm -2.0 - 2.4 CO8 kb kb sion of the TCR/CD3 complex by DN-ATL cells would also be diminished despite their lack of CD4 and CD8 antigens, cells from patient no. 4 were used. Similar to CD4' ATL cells, the surface expression of CD3 antigen was diminished normal T cell DN-ATL anti-CD3 (Leu41 Fig4. Representativehistograms of CD3 antigen expression after stimuli with anti-CD3 MoAb. PBMNC from patient no. 4 and m a l PBMNC were cultured with 1 rg/mL OKT3 MoAb. After 18 hours, the cells were stained with Leu4 and analyzed as described in Materials and Methods. The MFI values for CD3 antigen expression are shown in the upper right-hand part of each histogram. From www.bloodjournal.org by guest on February 6, 2015. For personal use only. SUZUSHIMA ET AL 1036 D by the addition of I pg/mL OKT3 MoAb for 18 hours to cells from patient no. 4 or normal PBMNC (Fig 4). We also obtained a similar result after the addition of 1 pg/mL WT3 I MoAb (data not shown). Expression of the gene and protein of SlOOS by DN-ATL cells. Sl00/3 protein was recently reported to be expressed by the cells from some patients with aggressive T-cell chronic lymphoproliferativedisease (T-CLPD),which showed a double-negative phen0type.4~To examine whether DN-ATL cells also expressed SlOOfi, we analyzed the product and mRNA for this gene in DN-ATL and CD4' ATL by immunocytochemical assay and the RT-PCR. We examined the cytoplasmic SI00 protein in PBMNC from patients no. I and 2 using the PAP-staining technique. In the majority of the cells from both patients, SI00 protein was detected with strong or weak intensity in each cell (Fig 5C and D). In contrast, this protein was not detected in either the cells from a patient with CD4'ATL or normal PBMNC (Fig SA and B). A band corresponding to the amplified SlOO/3gene was clearly shown in DN-ATL patients no. I through 3, and was barely detectable in CD4' ATL (Fig 6). However, these faint bands were considered to be caused by contamination with normal SIOOfi-positivecells, because no band was detected in SKTI B cells derived from the original CD4' ATL cells. DISCUSSION Most ATL cells have the CD3+, CD4+, CD8-, and TCR as+ phenotype, so that ATL has been considered to be a mature T-cell leukemia! This report is of four patients with Fig 5. The expression of S100 protein in the cytoplasm of PBMNC smear from a normal volunteer (A), a patient with CD4+ ATL (B), patient no. 1 (C). and patient no. 2 (D). PAPstaining technique was used in this assay. ATL who express an aberrant phenotype of CD4-, CD8-. It is unlikely that this double-negative phenotype was caused by lack of the OKT4 epitope. The lack of CD4 and CD8 mRNA expression in these patients confirmed that their leukemic cells were derived from a double-negativesubset. It is also unlikely that this double-negative phenotype was derived from immature T cells because of its expression of the CD3 antigen but not TdT. Most mature lymphocytes having a double-negative phenotype are known to bear the TCR y6 chain. However, leukemic cells from all the DN-ATL patients did not react with anti-TCR y6 MoAbs. On the other hand, cell surface expression of TCR a@ was observed in two patients with acute ATL (patients no. 3 and 4), although the MFI values were low. The leukemic cells from all DN-ATL patients had rearrangements of the TCR /3 and y chain genes associated with allelic deletion of the TCR 6 chain gene. This genotype is usually observed in CD3+ TCR a@' mature Tcell neoplasia, including ATL.39*46Furthermore, leukemic cells from all the DN-ATL patients showed expression of TCR a@and CD3 6 mRNA but not TCR y6 chain mRNA. These findings indicate that the DN-ATL cells were derived from a TCR a/3-positivebut TCR 76-negative subset. Some ATL patients with an aberrant phenotype have been reported previously, such as CD2-, CD4' CD8' (double-positive),or CD4- CD8' (CD8 ~ingle-pitive).4'~~ Similar to typical ATL, the ATL cells of these patients also showed surface expression of the TCR afi chain, and no ATL cells expressing the TCR y6 chain have ever been reported to our knowledge. Taken together with these observations, our DN-ATL patients show From www.bloodjournal.org by guest on February 6, 2015. For personal use only. 1037 DN-ATL CELLS HAVE POOR TCR/CD3 EXPRESSION 1 2 3 4 5 6 7 SlOO4 - 303 Fig 6. Sl 00,9 gene mRNA expressionin DN-ATL cells. The RTPCR was used for the detection of S1008 mRNA as described in Materials and Memods. The size of the amplied SlOOB DNA was 303 bp. TCR CU was used as an internal control. Lane 1, SKT-1B; lane 2, patient no. 1; lane 3, patient no. 2; lane 4, patient no. 3; lanes 5 to 7, CD4* ATL. that TCR a@+ T cells with or without the CD4 phenotype are the sole target of HTLV-I-induced leukemogenesis. A subset of TCR aj3 lymphocytesthat lacks CD4 and CD8 expression has been detected in normal human peripheral blood; these cells responded to interleukin-2 (IL-2), IL-3, and IL-4, and had lytic activity when their TCR complex was activated.29The DN-ATL cells we examined only responded to IL-2 and IL-4, similar to typical ATL cells.5oCD4-, CDK, TCRaF lymphocyteshave also been detected in normal human skin, and they produced IL-2. tumor necrosis factor a (TNF-a), and interferon gamma (IFN-y) when they were stimulated with anti-CD3 MoAb and phorbol myristate acetate.." Interestingly, they had the same surface phenotype as DN-ATL cells (CD2+,CD7-, CD25', except for HLADR') after they were cultured with 1L-2 for 4 weeks, and the leukemic cells from one of our DN-ATL patients expressed mRNA of TNF-a and IFN-y without any stimulation (Suzushima et al. unpublished data). However, in this study only one of the four DN-ATL patients had prominent skin invasion by ATL cells. Therefore, it remains unclear whether DN-ATL cells originate from DN-T cells residing in the skin. Several cases of DN-T-cell lymphoma have been reported, which had many features in common with our DN-ATL cases." They were widespread at presentation, with frequent cutaneous, pulmonary, and bone marrow involvement, and they have a rapid course even with aggressive combined chemotherapy. However, HTLV-I or TCR studies were not performed in those lymphomas. DN-T-CLPD associated with massive hepatosplenomegaly but without significant lymphadenopathy or cutaneous involvement have been reported recently, and leukemic cells from those patients expressed SlOOj3 protein, which is known to be expressed by less than 3% of normal circulating lymphocyte^.^' Although these SlOOj3+ normal lymphocytes have a suppressor immunophenotype, with expression of CD2, CD8, and CDl I b, their role in normal T-cell function remains o b s c ~ r e . ~ We ~-~~ showed that cells from the DN-ATL we examined expressed the product and mRNA for the SlOOBgene. Although HTLVI proviral DNA was not detected in SI OO&positive CLPD?' it seems that the normal counterpart of the leukemic cells in DN-ATL is the same as that in SlOOj3-positive CLPD. In typical CD4' ATL cells, the MFI values of TCR aj3 and CD3 antigens are specifically decxa~ed.~-" Furthermore, surface expression of the TCR/CD3 complex by leukemic cells from lymphoma type ATL is lower than in acute ATL.'.IO." In addition, the relative proportion of TCR aj3 antigen-positive cells is lower than that of CD3 antigen-positive cells using our antibodies,'.'0*" resulting in a CD3', TCR aj3- phenotype." Among the four DN-ATL patients, the MFl values for TCR CUBand CD3 antigens were decreased in two cases of acute ATL (patients no. 3 and 4). Leukemic cells from the lymphoma type ATL patient (patient no. 1) had no surface expression ofeither TCR aj3 or CD3 antigens, whereas cells from the remaining acute ATL patient (patient no. 2) reacted with anti-CD3 but not anti-TCR a@ MoAb. Thus, surface expression of the TCR/CD3 complex was specifically decreased in DN-ATL as well as in typical ATL. This supports our hypothesis that diminished expression of this complex plays a key role in the development of ATL. Because expression ofthe TCR/CD3 complex on DN-ATL cells was further diminished by the addition of anti-CD3 or anti-TCR a@ MoAbs similar to that on CD4'ATL cells: it seems that the TCR/CD3 complex is downmodulated by some in vivo stimuli, although these cells have neither the CD4 nor CD8 antigens that are necessary for assembling MHC-TCR complexes. In mice, a subset of TCR aj3 lymphocytes without CD4 or CD8 antigen expression has been detected among mature thymocyte^,'^-^^ which preferentially expresses TCR Vj3 8 gene p r o d u ~ t s . ' ~The * ' ~DN-ATL ~~~ cells we examined did not have a common TCR Vj3 family gene product (Suzushima et al, unpublished data). Expansion of DN-T cells has also been reported in autoimmune mice homozygous for the /pr/ lpr (lpr) gene23-27 and in peripheral blood lymphocytes from systemic lupus erythematosis patients.2xThese /pr DN-T cells had low surface levels of TCR aj3 protein and normal or increased amounts of TCR a and j3 mRNA.23These similarities between / p i DN-T cells and DN-ATL cells raise a possibility that both types ofcells respond to unknown stimuli acting via the TCR aj3 and causing downmodulation of TCR/ CD3 complex expression on the cell surface. The TCR a/?is considered to recognize antigens presented by MHC molecules acting with CD4 or CD8, and it is not known whether DN-T cells that bear TCR a@ are able to recognize antigens. However, Ipr DN-T cells are reported to be involved in the generation of autoantibodies by interaction with surface Igs on Lyl+ B cells through the TCR The proliferation of DN TCR as" cells was also reported in a patient with combined immunodeficiency.s6These DN-T cells recognized cu- From www.bloodjournal.org by guest on February 6, 2015. For personal use only. SUZUSHIMA ET AL 1038 taneous tissue and were responsible for the reactions resembling those of graft-versus-host disease. Further analysis of TCR a@ligands is considered to provide some insight into the mechanism of the possible downmodulation of surface expression of the TCR/CD3 complex in DN-ATL. ACKNOWLEDGMENT We thank Drs T.M. Mak, H. Sakano, T.H. Rabbitts, C. Terhorst, and P. Kavasath for providing DNA probes; Dr T. Uchiyama for providing Tac monoclonal antibody; and Drs T. Watanabe, H. Natori, and R. Nakano for providing the samples in this study. REFERENCES I . 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For personal use only. 1993 81: 1032-1039 Double-negative (CD4- CD8-) T cells from adult T-cell leukemia patients also have poor expression of the T-cell receptor alpha beta/CD3 complex H Suzushima, N Asou, S Nishimura, K Nishikawa, JX Wang, T Okubo, M Naito, T Hattori and K Takatsuki Updated information and services can be found at: http://www.bloodjournal.org/content/81/4/1032.full.html Articles on similar topics can be found in the following Blood collections Information about reproducing this article in parts or in its entirety may be found online at: http://www.bloodjournal.org/site/misc/rights.xhtml#repub_requests Information about ordering reprints may be found online at: http://www.bloodjournal.org/site/misc/rights.xhtml#reprints Information about subscriptions and ASH membership may be found online at: http://www.bloodjournal.org/site/subscriptions/index.xhtml Blood (print ISSN 0006-4971, online ISSN 1528-0020), is published weekly by the American Society of Hematology, 2021 L St, NW, Suite 900, Washington DC 20036. 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