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Query: UMLS:C0001175 (AIDS)
 120,706 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Hematologic abnormalities occur in the majority of patients with acquired immunodeficiency syndrome (AIDS). Infection of the hematopoietic progenitor cells has been proposed as a potential explanation. In this study, different bone marrow cell populations, including the CD34+ hematopoietic progenitor cells, were purified by a fluorescence-activated cell sorter (FACS) and analyzed for the presence of human immunodeficiency virus-1 (HIV-1) proviral DNA using the polymerase chain reaction. A group of 14 patients with AIDS or AIDS-related complex (ARC) was studied (11 with peripheral blood cytopenias). The CD4+ helper cells in the bone marrow were found positive for HIV-1 DNA in all patients. In contrast, CD34+ progenitor cells were positive in only one patient. Two monocyte samples and two samples of CD4-/CD34- lymphocytes/blasts (mainly B and CD8 lymphocytes) were positive. Proviral DNA could not be detected in granulocytes. FACS analysis showed that the percentage of CD34+ hematopoietic progenitor cells was not altered in the bone marrow of AIDS patients in comparison with the HIV-1 seronegative controls. In contrast, the number of CD4+ lymphocytes was markedly reduced in the bone marrow of AIDS patients. These results show that the hematologic abnormalities in AIDS patients are neither explained by direct infection of the hematopoietic progenitor cells with HIV-1 nor by a depletion of progenitor cells.
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PMID:CD34+ hematopoietic progenitor cells are not a major reservoir of the human immunodeficiency virus. 169 76

Over a period of 11 months, 37 patients infected with the Human Immunodeficiency Virus (HIV) presenting with symptoms of bronchopulmonary disease were investigated. Patients presented with cough, weight loss, fever and dyspnoea. Investigations included fibreoptic bronchoscopy with bronchoalveolar lavage and transbronchial biopsy. In eight patients (22%) Pneumocystis carinii was found. Pulmonary infiltrates were found on chest radiographs of six patients, while in the remaining two patients chest radiographs showed clear lung fields. P. carinii was found in two patients with pulmonary Kaposi's sarcoma. Infection with P. carinii often occurred with other pathogens: Streptococcus pneumoniae was found in four patients, Staphylococcus aureus in two and tuberculosis in two. P. carinii pneumonia does occur in patients with HIV infection in Africa and the diagnosis is relatively simple to make provided that transbronchial biopsy and bronchoalveolar lavage are carried out through a fibreoptic bronchoscope and specimens examined after appropriate staining. However, the prevalence of P. carinii in patients with HIV infection in Africa appears to be lower than that found in patients with HIV infection in Europe and North America.
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PMID:Pneumocystis carinii pneumonia in patients with AIDS in Central Africa. 169 54

We examined the effects of topoisomerase inhibitors on human immunodeficiency virus type 1 (HIV-1) infection of H9 cells in cell culture. Infection is blocked or substantially reduced by the topoisomerase I inhibitor camptothecin (CPT), but not by two topoisomerase II inhibitors. Significant reduction (greater than or equal to 90%) in the amount of virus released, as measured by reverse transcriptase, is obtained if the cells are treated for 1 h with 0.01-0.02 microM CPT at the time of virus infection, and expression of viral proteins is also blocked. CPT is also shown to reduce the level of infection when chronically infected cells are cocultivated with uninfected cells. These results with CPT suggest that this compound may represent a new class of drugs with antiretroviral potential.
AIDS Res Hum Retroviruses 1991 Jan
PMID:Inhibition of human immunodeficiency virus (HIV-1) replication in vitro by noncytotoxic doses of camptothecin, a topoisomerase I inhibitor. 170 42

Until recently, much of the effort put into development of an AIDS vaccine has focussed on the elicitation of a neutralizing antibody response. The viral target of neutralization, HIV envelope glycoprotein, has been produced in bulk through recombinant techniques, but has had little success as a vaccine. The specific epitopes to which neutralizing antibodies bind have been mapped, and although the major epitope is hypervariable, others are conserved. This allows the design of second generation vaccines. Meanwhile, vaccine studies in the SIV animal model simply using inactivated virus as immunogen have demonstrated that an effective vaccine is at least possible. A variety of HIV vaccine preparations are now under investigation and the outlook for the future is promising.
Infection 1991
PMID:Neutralizing antibodies and antigens in AIDS. 170 55

Infection of macaque monkeys with the simian immunodeficiency virus of macaques (SIVmac) results in disease similar to human AIDS. Therefore, the macaque monkey is proving to be an important model for testing the effectiveness of various AIDS vaccine approaches. A detailed analysis of the cellular immune responses is necessary for the evaluation of candidate vaccines. However, this has not been possible in macaques, due, in part, to the unknown nature of the MHC molecules that restrict their T lymphocytes. In our report we demonstrate that a particular MHC class I molecule involved in the rhesus monkey's effector T lymphocyte response to SIVmac is expressed at a high frequency in a colony of rhesus monkeys. SIVmac-infected monkeys that express this MHC class I molecule all develop CTL that are restricted by that molecule and recognize an identical nine amino acid epitope of the SIVmac gag protein. This MHC class I molecule has been defined as an HLA-A homolog by cDNA cloning and sequencing. It has also been expressed in an MHC class I-deficient cell line to demonstrate directly the cloned molecule's capacity to bind and present peptide Ag to CTL. These studies illustrate that AIDS virus-specific CTL can be characterized in detail in the rhesus monkey and lay the foundation for exploring novel approaches to AIDS virus vaccination in this species.
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PMID:Definition of an epitope and MHC class I molecule recognized by gag-specific cytotoxic T lymphocytes in SIVmac-infected rhesus monkeys. 171 Oct 81

Peripheral blood cells with the HNK-1 phenotype were studied in HIV infected patients of which 28 with Asymptomatic Infection (AI), 64 with Persistent Generalized Lymphoadenopathy (PGL), 9 with AIDS Related Complex (ARC), and 12 with AIDS. Eight normal subjects served as controls. Two-color immunofluorescence by flow cytometry analysis showed in all of them a significant increase of the mean percentage of HNK+T3- lymphocytes (greater than 20%) as compared to controls (6%). Only in AI the mean absolute count was significantly higher (776/cmm) than control's one (152/cmm). Percentages and absolute counts of HNK+T3- lymphocytes were similar to normal ones. In AI and PGL HNK+T3+ cells correlated directly with T8 lymphocytes and inversely with T4 cells and T4/T8 ratio. These results indirectly suggests that HNK+T3+ cells represent a subset of suppressor/cytotoxic lymphocytes. The results in ARC and AIDS were somewhat equivocal and deserve further study in larger samples. No correlation was found between HNK+T3+ and HNK+T3- cells. The expansion of HNK+T3+ cells was parallel to that one of T8 lymphocytes expressing CD8 antigen at high surface density which were previously reported as having cytotoxic activity. Follow-up studies of the HNK cell peripheral pattern will clarify if it can be regarded as an early predictor of clinical outcome.
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PMID:HNK-1 peripheral blood lymphocytes in HIV infected patients. 171 44

Human epidermal Langerhans cells play an important role in the immunoregulation of the skin. We measured the numbers of CD(3+)-, CD(8+)-, CD1a(+)-, HLADR(+)-, IL2R(+)-, CD(4+)- and CD68 positive cells in the skin of 8 asymptomatic HIV-infected Persons, 3 Patients with AIDS and 11 healthy volunteers by suction blister technique. Our results indicate increased numbers of CD1a+ cells and increased numbers of CD4+ cells in the epidermis in asymptomatic HIV-infection. At the same time CD68+ cells are decreased already in an early stage of HIV-Infection. The number of CD1a/CD4+ cells is related to the degree of immunodeficiency. This fact might be caused by the activation of MPS.
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PMID:[Lymphocytes, Langerhans cells and CD68-positive monocytes/macrophages in the skin of HIV-infected patients and normal controls]. 172 11

The effects of cocaine and murine AIDS on natural killer (NK) cell activity in C57BL/6 mice was studied. Cocaine may play a major role in the development and progression to AIDS in the human population. Chronic intraperitoneal injection of cocaine was shown to cause an increase in NK cell activity over those of saline-treated animals. Infection with LP-BM5 murine leukemia retrovirus was also shown to increase NK cell activity. NK cell activity was increased in retrovirally infected mice treated with cocaine beyond that of mice treated with cocaine alone. This study indicates an important immunomodulatory effect of cocaine on NK cell activity, especially when combined with the effects caused by retroviral infection.
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PMID:Stimulation of natural killer cell activity by murine retroviral infection and cocaine. 175 20

Infection with the human immunodeficiency virus type 1 (HIV-1) can cause a spectrum of renal disease, termed acquired immunodeficiency syndrome (AIDS) nephropathy. The most common clinical manifestations of kidney involvement in HIV-1-infected patients are proteinuria and/or nephrotic syndrome, and the histopathological pattern usually reveals focal segmental glomerulosclerosis. We describe an 8-year-old child with AIDS who presented with recurrent gross hematuria. A kidney biopsy demonstrated IgA nephropathy. This unique case indicates that the range of kidney disease in HIV-infected children may be broader than originally thought, and that these patients warrant a complete evaluation of any renal abnormality.
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PMID:IgA nephropathy in a child with human immunodeficiency virus type 1 infection. 176 86

The ecology of Cryptococcus neoformans and the epidemiology of cryptococcosis are reviewed. Two varieties of C. neoformans have been recognized. C. neoformans variety neoformans has been found in nature worldwide, primarily in association with bird droppings, although nonavian sources have also been found. Most cases of human cryptococcosis are caused by this variety. C. neoformans var. gattii has recently been isolated in nature in association with Eucalyptus trees. Infections caused by this variety occur mainly in tropical and subtropical regions. Because exposure to C. neoformans is probably common and clinically apparent cases of cryptococcosis in healthy hosts are rare, it is presumed that most people can mount adequate host defenses upon exposure to the organism. At least 5%-10% of patients with AIDS become infected with Cryptococcus; the epidemiology of this infection is different in many respects from that seen in patients without AIDS.
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PMID:The ecology of Cryptococcus neoformans and the epidemiology of cryptococcosis. 177 49


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