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Immunodeficiency Virus Enhancer by Activation Of Proc. Natl. Acad. Sci. USA Vol. 86, pp. 2336-2340, April 1989 Immunology Tumor necrosis factor a and interleukin 1 stimulate the human immunodeficiency virus enhancer by activation of the nuclear factor cB (cytokines/T-cell activation/human immunodeficiency virus latency) LAURELEE OSBORN*, STEVEN KUNKELt, AND GARY J. NABEL*t *Howard Hughes Medical Institute, Departments of Internal Medicine and Biological Chemistry; and tDepartment of Pathology, University of Michigan Medical Center, Ann Arbor, MI 48109 Communicated by David Baltimore, December 23, 1988 ABSTRACT Binding ofpeptide hormones to surface mem- Binding of NF-KB can be activated by phorbol 12-myristate brane receptors leads to the transcription of specific genes 13-acetate (PMA) (1, 12), protein synthesis inhibitors such as within relevant target cells. How these signals are transduced cycloheximide or anisomycin (12), or the transactivator of to alter gene expression is largely unknown, but this mechanism human T-cell lymphotropic virus type I, tax1 (6). In 70Z or probably involves a sequence of enzymatic steps that activate Hela cells, NF-KB binding is superinduced by PMA in factors in the nucleus that modulate transcription. We now combination with protein synthesis inhibitors (12), indicating demonstrate that two different peptide hormones, or cytokines, multiple mechanisms of activation. Recently, a specific stimulate the human immunodeficiency virus enhancer, and inhibitor has been implicated as one such regulator of NF-KB this effect is mediated by nuclear factor (NF) KB (nuclear factor (13, 14). Although treatment with PMA stimulates NF-KB that binds the K immunoglobulin light chain gene enhancer). binding activity, physiologic activators of this transcription These cytokines, tumor necrosis factor a and interleukin 1, act factor were unknown. In this report, we have examined on multiple cell types and represent the only naturally occur- whether peptide hormones activate NF-KB binding and ring activators of this transcription factor among eight cyto- stimulate the HIV enhancer and have analyzed the mecha- kines examined. Although NF-KB binding can be stimulated by nism and specificity of NF-KB activation in T cells. phorbol 12-myristate 13-acetate, tumor necrosis factor a acts through an independent mechanism, inducing NF-KB binding in HT-2 cells, which did not show increased binding in'response MATERIALS AND METHODS to phorbol 12-myristate 13-acetate, and causing superinduction Cell Culture. Cell lines were maintained in RPMI 1640 in Jurkat T-lymphoma cells. Tumor necrosis factor a is also a medium supplemented with 10% fetal bovine serum, penicil- more selective activator of T cells than phorbol 12-myristate lin (50 units/ml), and streptomycin (50 ug/ml) with freshly 13-acetate, having no effect on lymphokine production in EL-4 added glutamine in a humidified incubator containing 5% cells at the same time it induces NF-KB. These findings suggest CO2. The 70Z leukemia cell medium was additionally sup- that human immunodeficiency virus gene expression can be plemented with 2-mercaptoethanol (50 ,uM), BaF3 cell me- induced in T cells without activating lymphokine secretion and dium was supplemented with recombinant interleukin 3 that the role ofthese cytokines in the activation oflatent human (IL-3) (100 units/ml), and HT-2 cell medium was supple- immunodeficiency virus infection deserves further clinical mented with rat spleen Con A-conditioned medium (Collab- evaluation. Finally, this link between binding at the surface orative Research). The 70Z cells were obtained from the membrane and stimulation of a specific transcription factor laboratory of D. Baltimore, BaF3 cells from R. Palacios, and should help derme intermediates for these cytokine activation HT2 from M. Kluger. pathways. Nuclear Extracts and Electrophoretic Mobility-Shift Assay. Electrophoretic mobility-shift assay was performed with a KB Immunologic mediators affect genes that regulate cell prolif- probe (6) as described (1) using 20 ,ug of cell extract in the eration and differentiation. The action of these peptide hor- presence of 1 ,g ofdIdC. Extracts were prepared for analysis mones, or cytokines, at the surface membrane probably leads from whole cells or nuclei by a rapid method, modified from to the activation of factors in the nucleus that modulate Dignam et al. (15). Briefly, for cellular extracts, 107 cells were transcription. One transcription factor responsive to cellular washed once with phosphate-buffered saline and twice with activation is nuclear factor KB (NF-KB), which stimulates the buffer A (15). The cell pellet was suspended in buffer C human immunodeficiency virus (HIV) enhancer in T cells (15)10.1% Nonidet P-40 (20 ul per 107 cells). After incubating treated with phorbol esters (1). NF-KB recognizes an 11- for 15 min on ice, the lysed cellular suspension was briefly base-pair DNA sequence present in the immunoglobulin light mixed on a Vortex and microcentrifuged for 10 min at 4°C. chain (2) and several primate virus enhancers (3-6). Se- The supernatant was diluted with 80 ,ul per 107 cells of buffer quences resembling KB sites are also associated with cell- D (15) modified to contain 0.05 M KCl instead of 0.1 M and surface products, including the class I major histocompatibil- stored at -70°C. Nuclear extracts were prepared by resus- ity antigen (7, 8), f32-microglobulin (9), and the interleukin 2 pending 107 washed cells (see above) in 20 ,ul of buffer (IL-2) receptor a chain (6, 10, 11). Thus, NF-KB-like tran- A/0.1% Nonidet P-40, incubating 10 min on ice, mixing scription factors may normally regulate expression of cellular genes associated with cell proliferation and recognition. Abbreviations: CAT, chloramphenicol acetyltransferase; HIV, hu- Mutations of the KB sites in the HIV enhancer that abolish man immunodeficiency virus; IL-1, -2, -3, and -4, interleukin 1, 2, 3, binding ofNF-KB eliminate inducibility ofthe HIV enhancer. and 4, respectively; NF-KB, nuclear factor KB (nuclear factor that binds the immunoglobulin K light chain gene enhancer); PMA, phorbol 12-myristate 13-acetate; TNF-a, tumor necrosis factor a; The publication costs of this article were defrayed in part by page charge ICPO, infected cell protein; GM-CSF, granulocyte/macrophage payment. This article must therefore be hereby marked "advertisement" colony-stimulating factor. in accordance with 18 U.S.C. §1734 solely to indicate this fact. tTo whom reprint requests should be addressed. 2336 Downloaded by guest on September 24, 2021 Immunology: Osborn et al. Proc. Natl. Acad. Sci. USA 86 (1989) 2337 briefly, and microcentrifuging for 10 min at 40C. The super- TRANSFECTED natant was removed, and the nuclear pellet was suspended in PLASMID: HIV-CAT MUTANT HIV-CAT (-KB) 15 pl of buffer C, incubated 15 min at 40C, mixed briefly, and I --I~~~~~~~~~~~~~~~- microcentrifuged for 10 min at 40C. The supernatant was diluted with 75 Al ofmodified buffer D (see above) and stored at -70'C. Comparable NF-KB binding activity was seen with -20 ,ug of cellular extract, 8 Ag of nuclear extract, or 8 ,ug of 10 nuclear extract prepared by the method ofDignam et al. (15) using stimulated Jurkat or 70Z cells. CONVERSION Chloramphenicol Acetyltransferase (CAT) Assay. Cell ex- (%) tracts were prepared 44 hr after transfection, protein con- centrations were normalized, and conversion of chloram- phenicol to its acetylated forms was assayed by standard methods (1, 16). Results are representative of at least three independent transfections, and SD for each CAT determina- tion was - 10%. Percentage conversions of [14C]chloram- phenicol to its acetylated forms are indicated. Cell Proliferation. Supernatants from EL4 cells incubated with different agents were prepared in RPMI 1640 medium/5o% TNF INDUCTION: _ + -(ICPO) _ -(ICPO) fetal bovine serum/penicillin at 50 units/ml and streptomycin FOLD at 50 Ag/ml and collected after 24 hr. Measurement ofsecreted STIMULATION: 5.8 12.2 1.1 30.1 growth factor was accomplished by using the HT-2 cell line FIG. 2. TNF-a activation of the HIV enhancer is dependent on and a colorimetric assay to determine proliferation (17). KB sites. Jurkat TAT-III cells (107) (18, 19) were transfected with HIV-CAT (10 ,ug) or a mutant plasmid (10 ;Lg) altered in both KB sites RESULTS (1). Twenty-four hours after transfection, an aliquot of cells was incubated for an additional 20 hr in the presence of recombinant Stimulation of the HIV Enhancer in Jurkat Cells: Depen- TNF-a (100 units/ml). Positive controls were obtained by cotrans- dence on cB Sites. To determine whether cytokines affect fection with an ICPO-containing plasmid (5 pLg), pSHZ (18), in the gene expression dependent on the HIV enhancer, we trans- absence of TNF-a. fected Jurkat cells with a plasmid containing the HIV en- hancer linked to the CAT gene, HIV-CAT (1). One day after of these plasmids but do not differ in their regulation from transfection, cells were incubated for an additional 20 hr with normal Jurkat cells (18). Although both plasmids can be recombinant human interleukin 1 (IL-1) (a plus f3 forms), activated by a herpesvirus transactivator, infected cell pro- IL-2, interleukin 4 (IL-4), interferon -y, tumor necrosis factor tein O(ICPO) (Fig. 2, see also ref. 18), the KB mutant plasmid a (TNF-a) or granulocyte/macrophage colony-stimulating is not induced by TNF-a (Fig. 2), indicating a requirement for factor (GM-CSF). No significant change in CAT activity was the KB sites. seen except for an 8-fold increase in the presence of TNF-a Specificity of TNF-a-Inducible NF-PcB and Superinduction. (Fig. 1A). This induction increased in response to the con- The ability ofTNF-a to induce NF-KB binding was analyzed centration ofTNF-a and was inhibited by specific antibodies by using an electrophoretic mobility-shift assay with Jurkat to TNF-a (Fig.
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