- Research article
- Open Access
- Open Peer Review
Genome-wide search for the genes accountable for the induced resistance to HIV-1 infection in activated CD4+ T cells: apparent transcriptional signatures, co-expression networks and possible cellular processes
- Wen-Wen Xu†1, 3,
- Miao-Jun Han†1, 3,
- Dai Chen4,
- Ling Chen5,
- Yan Guo1,
- Andrew Willden6,
- Di-Qiu Liu1 and
- Hua-Tang Zhang1, 2Email author
© Xu et al.; licensee BioMed Central Ltd. 2013
- Received: 31 December 2012
- Accepted: 23 April 2013
- Published: 1 May 2013
Upon co-stimulation with CD3/CD28 antibodies, activated CD4 + T cells were found to lose their susceptibility to HIV-1 infection, exhibiting an induced resistant phenotype. This rather unexpected phenomenon has been repeatedly confirmed but the underlying cell and molecular mechanisms are still unknown.
We first replicated the reported system using the specified Dynal beads with PHA/IL-2-stimulated and un-stimulated cells as controls. Genome-wide expression and analysis were then performed by using Agilent whole genome microarrays and established bioinformatics tools.
We showed that following CD3/CD28 co-stimulation, a homogeneous population emerged with uniform expression of activation markers CD25 and CD69 as well as a memory marker CD45RO at high levels. These cells differentially expressed 7,824 genes when compared with the controls on microarrays. Series-Cluster analysis identified 6 distinct expression profiles containing 1,345 genes as the representative signatures in the permissive and resistant cells. Of them, 245 (101 potentially permissive and 144 potentially resistant) were significant in gene ontology categories related to immune response, cell adhesion and metabolism. Co-expression networks analysis identified 137 “key regulatory” genes (84 potentially permissive and 53 potentially resistant), holding hub positions in the gene interactions. By mapping these genes on KEGG pathways, the predominance of actin cytoskeleton functions, proteasomes, and cell cycle arrest in induced resistance emerged. We also revealed an entire set of previously unreported novel genes for further mining and functional validation.
This initial microarray study will stimulate renewed interest in exploring this system and open new avenues for research into HIV-1 susceptibility and its reversal in target cells, serving as a foundation for the development of novel therapeutic and clinical treatments.
- CD4 + T cells
- CD3/CD28 costimulation
A comprehensive picture of the host factors putatively supporting HIV-1 (human immunodeficiency virus, type 1) replication in cells has emerged from recent siRNA studies [1–4] and meta-analysis . Genome-wide landscapes of host genes and proteins involved in HIV-1 infection and disease progression have also been established in gene array studies [6–9] and novel proteomic approaches [10–12]. In parallel, genome-wide association studies (GWAS) have revealed a set of inheritable genetic variations in large populations related to susceptibility to HIV-1 infection [13–15].
Against these exciting developments, there is still no global view of the host cellular factors that render the target cells resistance to infection, in spite of a few well-studied restriction factors [16–19]. A recent genome-wide screening for novel restriction factors  further highlighted this awareness and our interest in establishing a more holistic pictures of the host determinants working against HIV-1 susceptibility.
A crucial starting point for studies of this type is the consideration of sample sources, cell types, and experimental settings. In this regard, CD4 + T cells are the first choice; they are the major cell type amongst all the susceptible targets and reservoirs of HIV-1 infection . Apart from their intrinsic susceptibility, CD4 + T cells’ activation in vivo (during the natural courses of HIV-1 infection) and in vitro (typically with PHA/IL-2 stimulation) is generally recognized as an absolute prerequisite for the virus to replicate productively . However, rather unexpectedly, Levine et al. (1996) found that activation by co-stimulation with CD28 led to a complete loss of susceptibility to HIV-1 infection in these cells. This phenomenon was subsequently confirmed by several independent groups [23–26]. In spite of the fact that several further studies attempted to explore the potential of using thus-stimulated cells for the treatment of SIV/HIV infection in monkey models and clinical settings, progress in elucidating the underlying cellular and molecular mechanisms seems to have halted since 2002 for unknown reasons.
In the present study, in order to investigate the possible mechanisms of the observed reversal of HIV-1 susceptibility in these activated CD4 + T cells, we first replicated the reported experimental settings  and then performed genome-wide expression analysis using Agilent microarrays.
Isolation and stimulation of CD4+T cells
Buffy coats were obtained from healthy donors (Kunming Blood Station) and peripheral blood mononuclear cells (PBMCs) were isolated by Ficool-Hypaque (TBD Sciences) gradient centrifugation. Resting CD4 + T cells were then purified by magnetic negative selection (CD4 + T cell Isolation Kit II, Miltenyi Biotec) and only the aliquots of cells with purity > 95% as determined by flow cytometry were used for further analysis. This study was reviewed and approved by the internal review board of the Kunming Institute of Zoology, Chinese Academy of Sciences (approval ID: RTYX20090910-1, approval date: 2009-09-10). All donors provided written informed consent for participation in this study.
Cells were stimulated as previously reported [27, 28]. Briefly, freshly isolated CD4 + T cells were resuspended in RPMI 1640 medium (Gibco) supplemented with 10% heat inactivated fetal bovine serum (Gibco) and 20 mM HEPES (Amresco) and seeded in 6-well plates either at an initial density of 2 × 106 cells/well with human recombinant IL-2 (100 U/ml) and PHA (5 μg/ml) or 0.5 × 106 cells/well with polystyrene beads coated anti-CD3/CD28 antibodies (Dynal beads CD3/CD28 T Cell Expander, Dynal) at a bead to cell ratio of 3:1. Half media were changed every 2 days in CD3/CD28 costimualted CD4 + T cells and every 3 days in PHA/IL-2 stimulated cells. Cells were then cultured at 37°C in a humidified incubator with 5% CO2 for 6 days. Cells and the derived RNA samples and data sets were labeled “P”, “R”, and “B”, respectively, according to the PHA/IL-2 stimulated, un-stimulated resting and beads-stimulated settings.
Aliquots of cells to be analyzed were washed with FACS buffer (PBS supplemented with 1% bovine serum albumin (BSA)) and stained for 40 minutes in the dark at 4°C with anti-CD45RO-FITC, anti-CD25-PE, anti-CXCR4, fluorescent dye 5-(and −6)-carboxyfluorescein diacetate succinimidyl ester (CFSE) (Sigma-Aldrich), anti-Ki67(Abcam), anti-CCR5 (Biolegend) and anti-CD69-PE-Cy-5 (BD Biosciences) and appropriate isotype controls. After washing with FACS (Fluorescence Activated Cell Sorter) buffer, cells were fixed with 4% paraformaldehyde and analyzed on a FACS Calibur using Cell Quest and FlowJo 7.6.1.
Gene expression profiling with Agilent microarrays
Total RNA was extracted from stimulated or un-stimulated CD4 + T cells by TRIzol (Invitrogen) followed by a purification using RNeasy columns (Qiagen) according to the manufacturer’s protocols. The amount and quality of RNA preparations were evaluated on an Agilent 2100 Bioanalyzer with RNA6000 Nano Reagents and Supplies (Agilent).
Quality-checked RNAs were then transcribed with the First-Strand cDNA Synthesis Kit (Agilent) and their expression data obtained using Agilent 4 × 44 K Human Whole-Genome 60-mer oligonucleotide microarrays according to the protocols by the manufacturer. The original microarray data from this study are available at the NCBI GEO database (http://www.ncbi.nlm.nih.gov/geo/) under the accession number GSE34252.
Analysis of microarray data
The normalized ratio of the gene expression signals was log2 transformed and hierarchical clustering was performed with average linkage. The clustered heatmap was visualized using Treeview. The RVM (Random variance model) f-test was applied to filter differentially expressed genes for the different situations. After the significance analysis and FDR (false discovery rate) analysis, we selected the differentially expressed genes according to the p-value and FDR threshold set at p < 0.01 and FDR <0.01 [29–31]. And the fold changes of any two groups are more than 2.
Series-Cluster analysis was performed to identify the global trends and model profiles of expression according to signal density under the “P”, “R” and “B” conditions and in the P-R-B sequence. Fisher’s exact test and the multiple comparison test [32, 33] were applied to identify the model profiles with probability significantly higher than expected as random.
Gene ontology (GO) analysis  was performed to facilitate elucidating the biological implications of unique genes in the significant or representative profiles. GO analysis was used to find the main function of the genes having the same expression trend according to the Gene Ontology. Fisher’s exact test and χ 2 test were applied to identify the significant GO categories and FDR was used to correct the p-values.
Gene co-expression networks analysis  were performed to track the interactions among the differentially expressed genes, according to their normalized signal intensity in 6 representative profiles. Pearson correlation was applied to each pair of genes and the significantly correlated pairs were used to construct the network . To locate the core regulatory genes in the networks, k-core scoring was introduced to simplify graph topology analysis [37, 38]. A k-core of a given gene indicates its hub or nodal status with connection to “k” other genes in a network [37, 38]. Accordingly, the genes with largest k-core scores and highest degrees of connection were identified as “key regulatory genes” in a network  and those unique to each network were selected as “marker genes” for the cellular status of intrinsic susceptibility or induced resistance to HIV-1 infection.
Cellular characterization of stimulated and un-stimulated CD4+ T cells
Global expression profiles and signatures
In subsequent Series-Cluster analysis, we identified 16 possible profiles (Figure 2 middle) (Additional file 4: Table S2), which represent the overall expression patterns. Of these, 10 (#1, 5, 6, 7, 8, 9, 10, 11, 12 and 15, Figure 2 middle) showed the sharp difference between “B” and “P” cells. More specifically, genes down-regulated in “P” cells are shown in the “Pdown” (#1) profile and those up-regulated in these cells were grouped in the “Pup” (#9) profile (Figure 2 right). Similarly, genes up- or down-regulated only in “B” are represented in “Bup” (#8) and “Bdown” (#15) profiles. We merged three profiles (#5, 6 and 7) that contain the genes down-regulated in “P” but up-regulated in “B” into a new “PdownBup” profile, in order to show their special importance in the reduced resistance as they contain the genes which were down regulated in the susceptible “P” cells and at the same up-regulated in the resistant “B” cells. In the same way, we merged profiles #10, 11 and 12 into a new “PupBdown” profile to show the genes that were up-regulated in “P” cells but at the same time down-regulated in the “B” cells (Figure 2 right).
Functional categories and significant ontologies of the differentially expressed genes in “P” and “B” cells
It is immediately noticeable (Figure 3 left) that most of the 1,345 differentially expressed genes in the 6 representative profiles falls in the “B” cell-related expression, with 471 genes in the “Bdown” profile and 465 in “Bup”, respectively, representing the down-regulated and up-regulated un-permissive genes in the resistant “B” cells (Figure 3 left, Additional file 5: Table S3). In the “Bdown” profile, 222 genes with known functions gave a rather complicated ontology category but, after applying Fisher’s exact test, χ 2 test, and FDR analysis, a clearer picture emerged. Statistically, 43 genes were significantly involved in 4 major functional categories (Figure 3 middle), showing: (a) response to stimulus (immune response, cell surface receptor linked signal transduction and positive regulation of natural killer cell mediated cytotoxicity); (b) metabolic process; (c) multicellular organismal development; and (d) cellular process are predominantly influenced by the co-stimulation.
More genes (352) with known functions were identified in the “Bup” profile with 117 being significantly involved in 7 major GO categories, showing that (a) cellular process (cell adhesion, cell differentiation and regulation of transcription), (b) multicellular organismal development, (c) metabolic process, (d) response to stimulus, (e) localization, (f) circulatory system process, and (g) others are predominantly up-regulated following the co-stimulations. Exactly the same 7 categories were also up-regulated in the “PdownBup” profile, although the numbers of the genes in each category varied (Figure 3 middle right). These 7 categories contain all the 4 significant ones in the “Pdown” profile and one more category (cell fate determination) was also identified. Altogether, the 8 categories contain 144 genes representing the whole set of the “resistant genes” that are associated positively with the induced resistance or negatively with the highly susceptible status of the cells (Figure 3 right). However, they are dispersed in more diverse categories (Figure 4B) than the permissive ones (Figure 4A), indicating that the resistant genes have wider influence in cellular functions and may hold the crucial check points for HIV-1 infection in “multicellular organismal development”, “cellular process” and “metabolic process”. One of the striking examples is that 30 genes involved in the process of cell adhesion were found up-regulated in “B” cells (profiles “Bup” and “PdownBup”) (Figure 4B) (Additional file 6: Table S4).
Direct interactions of the genes with known functions with HIV-1 proteins
Specifically, 3 (Env, Nef, and Tat) of HIV-1 proteins attracted most of the host (no matter permissive or resistant) factors in this set of data, suggesting that host factors may have the capacity to counterbalance with the permissive genes by interacting with the same early genes in HIV-1 infection. This is coincided with the initial report that the novel anti-HIV effect induced by co-stimulation happens around viral entry and before integration . However, in terms of host gene functions, no overlap was identified between the resistant and permissive genes as the former were mapped on the categories of cell adhesion, multicellular organismal development and cell differentiation, while the latter on immune response, cell surface receptor signal transduction, cellular defense response and chemotaxis. Fewer but prominent genes, e.g., CD59, IL-2, IL-15, INDO and FN1 were found to interact with Gag and Vpr, although we did not find any genes in all our profiles capable of interacting with HIV-1 Vif or Rev.
Co-expressed genes and their networks in the permissive “P” and un-permissive “B” cells
KEGG pathways and schematic overview of HIV-host gene interactions in the resistant “B” cells
Verification of the differential gene expression by FACS
Clues for novels genes accounting for HIV-1 susceptibility and resistance
Interactions between HIV-1 proteins and 9 “key regulatory” genes
Mode of interactions
competes with, modulated by, up-regulates
interacts with, modified by
cooperates with, induces release of
interacts with, inhibits, regulated by, up-regulates
inhibited by, phosphorylated by
Activates, regulated by, phosphorylated by
In the present study, we re-established an experimental system for cellular and molecular studies on the induced resistance to HIV-1 infection in CD4 + T cells as first reported by Levine et al. . This cellular system includes two methods most commonly used to activate and expand CD4 + T cells in vitro. Incubation with PHA/IL-2 induces proliferating CD4 + T cells which are highly susceptible to HIV-1 infection and highly permissive for the subsequent viral replication, whereas co-stimulation with CD3/CD28 reverses the intrinsic susceptibility in these cells and renders them with resistance to HIV-1 infection and un-permissiveness for viral replication. Thus, these two extremely polarized statuses of activated CD4 + T cells, with the un-stimulated resting cells (susceptible to the infection but not permissive for the rapid viral replication) as control in the middle of the “spectrum of permissiveness”, constitute a highly insightful system in the search for host factors responsible for HIV-1 susceptibility and its reversal in CD4 + T cells.
We were attracted more by the biological significance and potentials of the induced resistance in the “B” cells. We first replicated this in vitro system and verified its usefulness (Figure 1 and ) at the cellular level. Considering the controversy around the source cells, i.e., which subsets (naïve or memory CD4 + T cells) could be induced to generate the resistance [24, 26, 46], we adopted a strategy using total CD4 + T cell population to start our study without prior cell sorting before co-stimulations. This gave us the chance to address the issue of which subset of CD4 + T cells was generated to be responsible for the induced resistance and led us to the first set of our findings, which shows a homogenous cell population emerged from the co-stimulation. These cells expressed three activation markers (CD25, CD69 and CD45RO) at high levels at the same time. Although the expression of these classical activation markers may not ultimately account for the induced resistance, they served well as indicators for the highly activated population and, more relevant to the following analysis, the homogeneity of the induced cells gave us the confidence for the subsequent whole-genome wide search for the “key regulatory genes” and the “core marker genes” in the status switch to resistance.
Apart from the above novel findings in defining the cell population emerged during the reversal of susceptibility, the present study is the first whole-genome-wide analysis for the genes that account for the induced resistance. Once again, the system allowed us to pin down the potential permissive and resistant genes since susceptible “P” and the resistant “B” cells are polarized at the two extremities of the “permissive spectrum”. As a result, the 1,345 genes in the 6 specific profiles for the “B” and “P” cells could be truly the representatives accounting for the intrinsic susceptibility to HIV-1 infection and its induced reversal in the target cells. This simple dichotomy classification further allowed us to analyze the differentially expressed genes for their gene ontology and co-expression with ease and confidence.
We have not included the popular pathway and transcript factor analysis in this initial genome-wide search but, by focusing on the gene categories and co-expression, managed to identify the major cellular processes involved the reversed susceptibility in the major HIV-1 target cells. Prominently, these include actin cytoskeleton system, protein degradation and cell cycle arrest. First, several lines of evidence highlighted that actin cytoskeleton were regarded as a barrier and the hijack of actin cytoskeleton facilitates entry of HIV into its target cells [47, 48]. In our study, 8 genes (ACTN2, PTPRF, SORBS1, PAR3, PVRL2, MYL9, MYH10 and PAK2) were found up-regulated in the resistant “B” cells (“Bup” profile in Figure 8A). These genes mediate assembly and contraction of actin and actomyosin and formation of tight junctions. Whether they formed a barrier against HIV-1 infection warrant further functional verifications. To the contrary, genes associated with actin polymerization (FN1 and ITGAX, Figure 8A), which have been shown to promote viral binding and entry  and is also necessary in chemotaxis and cytokinesis  was sharply down regulated in the “B” cells. Given that chemotaxis may actually serve to fuel the infection response by recruiting susceptible, activated CD4 + T cells to the virus, ultimately aiding viral dissemination , we therefore hypothesized that co-stimulation could also block the tracks for HIV-1 release and dissemination by reducing actin polymerization and chemotactic response.
Second, genes involved in ubiquitin-dependent degradation by the proteasome (WNT3, FZD1, FZD2, FZD3, FBXW11, RAD23B, DBAHV2, HLPA4L, IRAK3, IL1RAP, PROC and PROS1), which is the third step of endoplasmic reticulum associated protein degradation, were also predominantly in “B” cells (Figure 8B). This is consistent with previously report that the ubiquitin-proteasome was negatively associated with HIV-1 replication by acting to destroy incoming viral complexes at the early steps [50, 51]. We also found that ATPVOA4 and IGF2R, which are important for lysosome-mediated degradation of endocytosed proteins [52, 53], were up-regulated in “B” cells (Figure 8B). Therefore, co-stimulation could enhance the cellular defense to HIV-1 infection by up-regulating these lysosome- and proteasome-related genes .
Genes involved in cell cycle arrest
Genes of cell cycle arrest
Homo sapiens amyloid beta (A4) precursor protein-binding, family B, member 2 (Fe65-like) (APBB2), mRNA [NM_173075]
Homo sapiens cyclin-dependent kinase inhibitor 1A (p21, Cip1) (CDKN1A), transcript variant 2, mRNA [NM_078467]
Bup & PdownBup
Homo sapiens dystonin (DST), transcript variant 1eA, mRNA [NM_015548]
Homo sapiens growth arrest-specific 2 like 3 (GAS2L3), mRNA [NM_174942]
Homo sapiens napsin A aspartic peptidase (NAPSA), mRNA [NM_004851]
Homo sapiens nucleolar protein 3 (apoptosis repressor with CARD domain) (NOL3), mRNA [NM_003946]
Homo sapiens sestrin 2 (SESN2), mRNA [NM_031459]
Homo sapiens transcription factor 4 (TCF4), mRNA [NM_003199]
The other two major cellular programs which were profoundly influenced by the co-stimulation were metabolism and apoptosis (Figure 4B). This seems inconsistent with previous studies showing that (a) numerous metabolism-associated genes were down-regulated in LTNPs  and (b) apoptosis is widely accepted as a mechanism for T cell depletion in vitro and in vivo[3, 57, 58]. Further 5 genes (CA2, MED28, PLOD2, SLC2A3 and TMTC1), which were up-regulated as probably resistant genes in our “B” cells, were proposed as “host dependent factors (HDF)” in recent small-interfering RNA-knockdown screens [1–4, 20]. More surprisingly perhaps, in our set of potentially resistant genes, we did not find any overlap with those reported to be associated with LTNPs , viral latency [59, 60], or even the “resistance genes” identified by virus-host interaction network analysis using public data sets  (data not shown). However, these apparent discrepancies do not necessarily discredit our studies but, to the contrary, may favorably underscore the uniqueness and importance of the highly controlled experimental system we adopted and call for further studies down the line.
Finally, we chose to examine the expression of CCR5 and CXCR4, the 2 major HIV-1 co-receptors, on the cell surface by FACS analysis as the first part of our ongoing efforts to verify our array data and analysis. To our satisfaction, their expression in this set of experiments and our previous screening  consistently corroborated our bioinformatics analysis and helped in explaining the fact that the induced resistance by the co-stimulation is a CCR5-dependent phenomenon [24, 44, 45]. Obviously, large-scale validation and functional studies at both mRNA and protein levels are needed to corroborate the role of the key regulatory genes (e.g., ITGAX, VEGFA, FN1, CCND1, CA12, LAMB3, MYL9, etc.) and their pathways as the major determinants for the induced resistance. We hope the present study serves as a fresh call for a renewed interest in the experimental system as a useful model for the search of novel host resistant factors.
In summary, we replicated a simple yet powerful cellular system with CD3/CD28 co-stimulation and confirmed its usefulness in studying the induced resistance to HIV-1 in CD4 + T cells. This initial microarray study, although still descriptive and correlative in nature, allowed us a chance to glean valuable new insights into this phenomenon. Based on the overall expression patterns and apparent signatures of the differentially expressed genes, we managed to pin down 245 (101 potentially permissive and 144 potentially resistant) significant functional genes and 137 (84 potentially permissive and 53 potentially resistant) “key regulatory” genes involved in the reversal of target cell susceptibility to HIV-1 infection. Moreover, we showed that this system has the potential as a rich source for the search of novel genes accounting for the intrinsic susceptibility to HIV-1 and its reversal in the major target cells. We hope our findings will stimulate renewed interest in investigating the mechanisms underlying this phenomenon. We surmise that future studies of this kind will help in furthering our understanding of HIV-1 infection, which may ultimately then lead to the development of novel biomarkers and therapeutics.
We thank the National Engineering Center for Biochip in Shanghai for the RNA quality control and microarray hybridization, and Genminix Informatics Ltd., Co and Novel Bioinformatics Ltd., Co for their technical assistance in the bioinformatic analysis. This work was supported by the “100 Talents” Program of the Chinese Academy of Sciences (No. A0820), National Natural Science Foundation of China (NSFC, Nos. 31070817 & 30771951), and Applied Fundamental Research Program of Yunnan Province (Nos. 2008CC001 & 2010CD101).
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