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Certain HLA-DR5 and -DR6 Major Histocompatibility Complex Class

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Certain HLA-DR5 and -DR6 Major Histocompatibility Complex Class Proc. Nati. Acad. Sci. USA Vol. 91, pp. 11472-11476, November 1994 Immunology Certain HLA-DR5 and -DR6 major histocompatibility complex class II alleles are associated with a CD8 lymphocytic host response to human immunodeficiency virus type 1 characterized by low lymphocyte viral strain heterogeneity and slow disease progression SILVIU ITESCU, SAM ROSE, EDWARD DWYER, AND ROBERT WINCHESTER Division of Autoimmune and Molecular Diseases, Department of Pediatrics, Columbia University, College of Physicians and Surgeons, New York, NY 10032 Communicated by Dorothy M. Horstmann, July 5, 1994 (receivedfor review May 4, 1994) ABSTRACT Either of two structurally related major his- envelope and other regions. These temporal changes in viral tocompatibility complex class I alleles, DRB1*1102, which sequence have been considered to reflect the escape of the encodes a DR5 specificity, or DRB1*1301, which encodes a virus from successive constraints placed by the immune DR6 specificity, was found in 67% ofindividuals responding to response on newly emerging variants (6, 7). human immundeficlency virus type 1 (HIV-1) infection with a A subset of slowly progressing HIV-infected adults and syndrome characterized by persistent circulating and diffusely children manifests an unusual host response to HIV-1 char- Infiltrative CD8 lymphocytouis (DILS), slow progression to acterized by the development of persistent circulating CD8 opportunistic infections, and delayed CD4 T-cell depletion. lymphocytosis and infiltration of salivary glands and other These alleles were present in only 28% of ethnically matched viscera with CD8 T cells, a host response termed diffuse HIV-positive controls (P = 0.001). The frequency of infiltrative lymphocytosis syndrome (DILS) (8, 9). For long DRB1*1301 was increased in both Blacks and Caucians with periods of time these individuals maintain relatively well- this syndrome, while that of DRBI*1102 was increased only in preserved numbers of CD4 T cells and have low rates of Blacks, where 80% had either of these alleles. To investigate opportunistic infections (10). The low frequency ofculturable whether the host response associated with these alleles influ- virus isolated from the circulating T cells ofthese persons and ences the evolutionary divergence of the HIV-1 genome, se- the demonstration of HIV-1 in their salivary gland macro- quencing ofthe envelope V3 loop was performed. This revealed phages (11) suggest that the syndrome may reflect a response a sigificantly diminished lymphocyte viral heterogeneity com- to strains of HIV-1 that are at the M-tropic stage. Indeed, pared with random IiV+ controls matched for CD4 T-cell DILS clinically resembles the host response seen in some levels. These results suggest thatthe immunogenetics ofthe host sheep to infection with visna Maedi virus, a lentivirus that is Influence the nature of the immune response to HIV-1, which exclusively tropic for ovine monocytes (12, 13). The tissue may lead to constrained evolution of HIV-1 gene products. Of infiltration in DILS has the characteristics of an antigen- possible relevance, the a-helical third diversity region common driven reactive process in that the infiltrating CD8 T cells to both the DRB1*1102 and DRB1*1301 allelic products was have a memory phenotype (11) and a T-cell receptor (TCR) noted to have homology with the C-terminal region of the (3chain repertoire characterized by both selective combina- HIV-1 envelope V3 loop at six ofnine consecutive residues. This tions of variable (V) and joining (J) region segments as well suggests the pibilit that these alleles may bias the anti-HIV as distinct structural features of the VDJjoining region (D = T-cell receptor repertoire through a mimicry mechanism. diversity) (14). Moreover, there is often marked diminution in salivary gland size following zidovudine treatment (11), em- A striking feature in human immunodeficiency virus type 1 phasizing the role of HIV-1 in driving this immune response. (HIV-1) infection is the variation between individuals in the A central issue is whether the immune response to HIV-1 duration from initial infection to the appearance of a signif- present in persons with DILS is under control of the major icantly compromised immune system (1). Some individuals histocompatibility complex (MHC). The MHC molecules progress slowly, with delayed appearance of CD4 T-cell function to both initiate an immune response by binding and depletion and opportunistic infections, while others progress presenting immunogenic peptides and, earlier in ontogeny, to very rapidly. Progression of HIV-1 infection is generally shape the peripheral TCR repertoire by a process ofpositive associated with increasing variability in the structure and and negative selection occurring in the thymus (15-18). function ofinfecting viral strains. HIV-1 strains isolated from Accordingly, HLA genotyping offers a clue to the existence infected persons at early stages of disease tend to replicate of particular immune recognition events that may be present preferentially in monocyte lineage cells (M-tropic), whereas in different persons. In an earlier limited study, in which the those isolated from individuals late in the course of infection syndrome was initially described and where most of the with CD4 T-cell depletion and opportunistic infections are patients were Black, an increase in the frequency of the designated T-tropic because they grow more easily and at serologically defined MHC class II specificity HLA-DR5 was higher titers in T cells and exhibit greater cytopathic effects reported (19). However, HLA-DR5 has also been reported to (2). Evidence has been presented that some of the M and T be increased in HIV-infected Caucasians developing Kaposi patterns of cellular tropism correlate with structural differ- sarcoma (20). This latter association may be due to a Cau- ences within the HIV-1 gpl20 envelope, most notably the casian haplotype, where HLA-DR5 is in linkage disequilib- presence of particular charged amino acids within the prin- rium with the MHC class I specificity HLA-B35, which is cipal neutralizing V3 domain (3-5), suggesting that the emer- also found at increased frequency among those with Kaposi gence ofhighly replicative T-tropic strains results, at least in sarcoma (21). Ethnic differences in the presence of such part, from evolution of structural genes encoding the viral Abbreviations: MHC, major histocompatibility complex; HIV, hu- The publication costs of this article were defrayed in part by page charge man immunodeficiency virus; DILS, diffuse infiltrative lymphocy- payment. This article must therefore be hereby marked "advertisement" tosis syndrome; TCR, T-cell receptor; OR, odds ratio(s); D, diver- in accordance with 18 U.S.C. §1734 solely to indicate this fact. sity. 11472 Downloaded by guest on September 26, 2021 Immunology: Itescu et al. Proc. Natl. Acad. Sci. USA 91 (1994) 11473 haplotypes reflect differences in the ethnic distributions of using a 96-well manifold. Signals were quantitated by a various alleles that encode a particular serologic specificity. Betagen betascope. With respect to DR5, while the predominant allele in Cau- Detrmination of HIV-1 V3 Domain Sequence. HIV-1 V3 casians is DRB1*1101, this subtype accounts for only about loop sequences were determined in four individuals with 50% of DR5 alleles found in Blacks (22, 23). Since the initial DILS and in three controls, all with CD4 T-cell counts DR5 serologic association with DILS was made predomi- between 200 and 500 per mm3 and none ofwhom had ever had nantly in Blacks, and HLA-B35 is found at very low fre- an opportunistic infection. DNA was extracted from 5 x 106 quency among all persons with DILS (10), at a molecular uncultured peripheral blood mononuclear cells, and the level the structure of the allelic product encoding the DR5 HIV-1 V3 domain region was amplified by two rounds of specificity in those with DILS is likely to differ from amplification in a DNA thermal cycler using nested primers, DRB1*1101. different concentrations ofMgCl2, and Taq polymerase (Per- In the present study, we sought to investigate whether kin-Elmer/Cetus). Each round of 30 cycles consisted of 30 certain MHC class II allelic structures might be eniched sec of denaturation at 940C, 60 sec of annealing at 550C, and among individuals with the exuberant CD8 lymphocytosis 90 sec of extension at 720C. The first round of amplification syndrome, DILS. In addition, we sought to establish whether was performed using sense and antisense primers, respec- the presence of such structures results in an immune re- tively, 5'-GAGCTCTACAATGTACACATGGAAT-3' and sponse that influences the evolution of HIV-1 gene products 5'-CTGCAGTTACAGTAGAAAAATTCTCC-3' in 3.0 mM such as the V3 loop. MgCl2. The second round used sense and antisense primers, respectively, 5'-GAGCTCAATGGCAGTCTAGCAGAA- PATIENTS AND METHODS GAAGA-3' and 5'-CTGCAGTTTCTGGGTCTCCTCCT- GAGG-3' in 1.5 mM MgCl2. After directly ligating the am- Patients. Frequencies of different MHC class II alleles plified product into T/A vector (Invitrogen), 10-16 clones per were compared in persons with DILS and in HIV-positive person were sequenced using an automated DNA sequencer controls. Criteria for DILS consisted of (i) HIV positivity by (Applied Biosystems). Evolutionary distances between nu- ELISA and Western blot analysis, (ii) salivary gland enlarge- cleotide sequences ofquasispecies present in each individual ment persisting for at least 6 months in all adults and children, were determined using the two-parameter model of Kimura and (iii) salivary or lacrimal gland biopsy performed in all for pairwise comparisons (26). adults, but not children, demonstrating lymphocytic infiltra- tion in the absence of granulomatous or neoplastic involve- ment. Serologic HLA frequencies were compared between RESULTS 38 unrelated individuals with DILS (20 Black, 18 Caucasian) Serological ILA Analysis: Increased Frequency of HLA- and 97 HIV-positive controls (51 Black, 46 Caucasians) from DR6 Amon B ad Caucias with DILS and ofHLA- the same institutions in New York City. Of the HIV+ DRS among Blacks Only.
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