Utility of fine-needle aspiration cytology in the diagnosis of HIV lymphadenopathy.

BACKGROUND: India, being a developing country, harbors the third largest human immunodeficiency virus (HIV)-infected population in the world, and HIV-associated lymphadenopathy is commonly encountered. HIV lymphadenopathy is more commonly generalized and pathology ranges from reactive lymphoid hyperplasia to infections like tuberculosis to neoplasms such as lymphoma and Kaposi sarcoma. The study intended to assess the utility of fine-needle aspiration (FNA) cytology in HIV lymphadenopathy. MATERIALS AND METHODS: A retrospective FNA slide review of HIV-infected cases with lymphadenopathy received over a period of 2 years in the cytopathology department was performed. The clinicopathological characteristics, absolute lymphocyte count (ALC), and CD4 counts were analyzed. RESULTS: Seventy-nine lymph node aspirates were received from HIV patients over 2 years. The mean age at presentation was 39 years with a male:female ratio of 2.4:1. Cervical lymph nodes (62%) were more commonly affected. Tuberculous lymphadenitis was the commonest lesion (41.8%), followed by reactive lymphadenitis (24%), nonspecific granulomatous lymphadenitis (14%), suppurative lymphadenitis (8%), cryptococcal lymphadenitis (2%), lymphoma (9%), and metastasis (1%). CONCLUSION: Lymph node FNA in HIV/AIDS is not only useful in identifying those cases that require further evaluation, but also aids in categorizing various etiologies such as opportunistic infections, non-neoplastic, and neoplastic lesions. FNA is a less expensive, expeditious minimally invasive method for an early diagnosis that abets in deciding the treatment strategy, thus curtailing the associated morbidity and mortality.

[COMPLICATIONS OF VIDEOTHORACOSCOPIC BIOPSY OF INTRATHORACIC LYMPH NODES AND METHODS OF THEIR PROPHYLAXIS].

Videothoracoscopy constitute a secure miniinvasive method of diagnosis of intrathoracic lymphadenopathy syndrome. Pulmonary hemorrhage and injury constitute intraoperative videothoracoscopic complications, and pulmonary collapse, hemorrhage, purulent complications ­ postoperative complications. Satisfactory intraoperative visualization, guaranteeing optimal position of the patient's body on operative table and sufficient pulmonary collapse on the intervention side, application of medical аlpha­cyanacrylate adhesive with hemostatic sponge for hemostasis in a biopsy zone, systemic application of antibiotics constitute the main prophylactic methods for videothoracoscopic complications and optimization of conditions for videothoracoscopic biopsy of intrathoracic lymphatic nodes. Application of the methods proposed have permitted to reduce the intraoperative complications rate from 19.2 tо 2.8%, and a postoperative one ­ from 23 tо 2.8%.

A clinicopathological study of peripheral lymph nodes in HIV-infected patients with special reference to CD4+ T-cell counts: Experience from a tertiary care institution in Darjeeling (India).

BACKGROUND: HIV/AIDS is a major health burden worldwide. India bears the third highest HIV-patients load globally. In the Darjeeling district, HIV-prevalence is >1% with very little known about the profile of HIV-lymphadenopathy. The aim of this study was to identify the different causes of peripheral lymphadenopathy among HIV-infected patients in this region, correlate them with CD4+ T-cell counts and formulate some common clinico-haematological parameters as potential predictors of CD4+ T-cell count. METHODS: In the present study, 76 cases were evaluated. Fine Needle Aspiration Cytology (FNAC) was performed as an out-patient procedure in the Department of Pathology. Smears were stained routinely with Haematoxylin-Eosin and Leishman stains. ZN stains were done when indicated by the cytological findings. Immediate CD4+ T-cell count was obtained by referring the patients to the Anti-retroviral therapy centre. RESULTS: Cytological diagnoses included tuberculosis (82.9%), reactive hyperplasia (6.6%), nonspecific granulomatous lesions (3.9%), non-Hodgkin lymphoma (2.6%), histoplasmosis (2.6%) and simultaneous filariasis with toxoplasmosis (1.3%). Statistically, the opportunistic infections and lymphomas significantly concurred with a CD4+ T-cell count <350/µl. Likewise, the number of enlarged lymph nodes and absolute lymphocyte count (ALC) were found to be useful predictors of CD4+ T-cell counts. CONCLUSIONS: Lymph node cytology in HIV-infected patients is essential to identify opportunistic infections from neoplastic lesions and; to enable therapeutic strategies. Correlation of lesions with mean CD4+ T-cell count predicts personal immunity, stage of disease and disease activity. Furthermore, enlarged lymph node numbers and ALC can be surrogate markers of CD4+ T-cell count for monitoring the severity of the immune suppression in under-resourced countries like India.

Role of fine-needle aspiration cytology in human immunodeficiency virus-associated lymphadenopathy: a cross-sectional study from northern India.

OBJECTIVE: To evaluate the role of fine-needle aspiration cytology in the diagnosis of human immunodeficiency virus (HIV)-associated lymphadenopathy. DESIGN: Case series. SETTING: Tertiary care teaching hospital, India. PATIENTS: Fifty consecutive HIV-positive patients, who presented with lymphadenopathy at the out-patient department and antiretroviral therapy clinic. RESULTS: Tubercular lymphadenitis was the most common diagnosis, reported in 74% (n=37) of patients; 97.2% of them were acid-fast bacilli-positive. Reactive lymphadenitis and fungal lymphadenitis were present in 10 and 1 cases, respectively. The most common cytomorphological pattern of tubercular lymphadenitis was necrotising suppurative lymphadenitis, present in 43.2% (n=16) of patients. Of eight biopsies done in reactive cases, six turned out to be tubercular lymphadenitis. Fine-needle aspiration cytology had a sensitivity of 83.7% for diagnosing tubercular lymphadenitis. CONCLUSION: Necrotising suppurative lymphadenitis should be recognised as an established pattern of tubercular lymphadenitis. Reactive patterns should be considered inconclusive rather than a negative result, and re-evaluated with lymph node biopsy. Fine-needle aspiration cytology is an excellent test for diagnosing tubercular lymphadenitis in HIV-associated lymphadenopathy.

[Optimization of intraoperative conditions in endoscopic biopsy of intrathoracic lymph nodes].

Conducted a retrospective analysis of the results transpleural (videothoracoscopic and videoassisted) biopsy of intrathoracic lymph nodes (ITLN) performed in 91 patients with hilar lymphadenopathy syndrome of various etiologiy for the period from 2003 to 2014. Endoscopic ITLN biopsy performed in the mediastinum in the high risk zone, so patients need to create adequate and safe intraoperative comfort, in particular, the position of lying on side, imposing artificial pneumothorax before surgery, one-lung ventilation, lifting the head end of the operating table at 300. These measures provide optimal con- ditions for handling and minimizing the frequency of intraoperative complications or prevention after surgery.

Lymphoepithelioma-like gastric carcinoma: an unusual consequence of Epstein-Barr virus infection in an HIV-infected woman.

Lymphoepithelioma-like-gastric carcinoma (LEL-GC) is an Epstein-Barr virus (EBV)-associated neoplasm of the stomach reported to have a better prognosis than conventional gastric adenocarcinoma. Unlike other EBV-associated malignancies, particularly lymphoproliferative disorders and undifferentiated nasopharyngeal carcinoma, for which risk has been shown to increase in human immunodeficiency virus (HIV) infection, LEL-GC remains rare; only one HIV-infected patient with LEL-GC has been reported previously. We describe an aggressive case of EBV-associated LEL-GC in a woman co-infected with HIV 1 and hepatitis C virus. In situ hybridization of an endoscopic biopsy specimen for EBV-encoded small RNA confirmed the presence of this agent exclusively in the gastric cancer cells. Our patient had recently started antiretroviral therapy, suggesting that immune reconstitution may have been a factor in presentation of this tumour.

Clinical predictors for the aetiology of peripheral lymphadenopathy in HIV-infected adults.

OBJECTIVES: The aim of the study was to determine the aetiology and clinical predictors of peripheral lymphadenopathy in HIV-infected individuals during the antiretroviral (ARV) era in a nontuberculosis endemic setting. METHODS: A multicentred, retrospective cohort study of peripheral lymph node biopsies in HIV-positive adults was carried out. A total of 107 charts were identified and reviewed for clinical features, lymphadenopathy size, and ARV use and duration. Biopsy results were categorized, and multivariate logistic regression determined independent predictors of lymphadenopathy aetiology. RESULTS: Evaluation of 107 peripheral lymph node biopsies revealed that 42.9% of peripheral lymphadenopathy was attributable to malignancy, 49.5% to reactive changes, and 7.5% to infections, with only 2.8% of all cases secondary to tuberculosis. Fevers, weight loss, ARV use, and lower viral loads are significantly associated with nonreactive lymphadenopathy. CONCLUSIONS: Lymphadenopathy is likely to be reactive or malignant in nontuberculosis endemic regions. Readily available clinical features can aid clinicians in predicting the underlying aetiology, those at risk for malignancy, and who to biopsy.

The incidence of human herpes virus-8 expression in lymph node biopsies from human immunodeficiency virus-positive patients.

AIMS: Human immunodeficiency virus (HIV)-related lymphadenopathy is characterized by a wide spectrum of histological changes. Three patterns have been described which correspond to clinical stages of HIV/acquired immune deficiency syndrome (AIDS). Castleman disease is a heterogeneous group of disorders. A recently described variant, multicentric Castleman disease (MCD), of which some cases are associated with human herpes virus-8 (HHV-8), has been reported in both HIV-seropositive and -negative patients. Considerable morphological overlap occurs between one of the patterns of HIV lymphadenopathy and this variant. METHODS AND RESULTS: This retrospective histopathological study on 95 cases of HIV-reactive lymphadenopathy assessed the incidence of the different patterns and HHV-8 on immunohistochemistry (IHC). Of the 95 cases, 78 (82.1%) were HHV-8-negative, of which 46 (59.0%) were classified as pattern A, 20 (25.6%) as pattern B and 12 (15.4%) as pattern C. Nine (31.0%) of 29 cases with pattern B and 8 (40.0%) of 20 cases with pattern C were HHV-8 positive. In total 15 cases of MCD were diagnosed in this series. CONCLUSION: This study draws attention to the overlap between HIV lymphadenopathy and MCD. We recommend that cases of HHV-8-associated MCD should be investigated for HIV infection.

[Clinicopathologic correlation between CD4-positive T lymphocyte counts and superficial lymphadenopathy in HIV-positive/AIDS patients].

OBJECTIVE: To explore the clinicopathological correlation between CD4(+) T lymphocyte count and superficial lymphadenopathy HIV/AIDS patients. METHODS: A total of 1066 HIV/AIDS patients were included in this study. The incidence of superficial lymphadenopathy, peripheral blood CD4(+) T lymphocyte counts and histological features of superficial lymphadenopathy were analyzed. RESULTS: Among 1066 patients, 126 cases (11.8%) presented with superficial lymphadenopathy. Of the 126 cases, there were 69 cases with CD4(+) T lymphocyte counts < 100/µl and clinical diagnoses including tuberculosis (37 cases), reactive hyperplasia (8 cases), AIDS-related lymphadenopathy (18 cases), penicillium diseases (12 cases), fungal infection (5 cases) and non-tuberculous mycobacterial infection (1 case). Twenty-six cases had CD4(+) T lymphocyte counts between 100/µl to 200/µl and clinical diagnosis including tuberculosis (12 cases), reactive hyperplasia (8 cases), AIDS-related lymphadenopathy(6 cases), penicillium disease (2 cases) and non-Hodgkin lymphoma (1 case). Twenty-nine cases had CD4(+) T lymphocyte counts > 200/µl and clinical diagnoses including tuberculosis (11 cases), reactive hyperplasia (12 cases), AIDS-related lymphadenopathy (3 cases), Penicillium diseases (1 case) and non-Hodgkin lymphoma (4 cases). The CD4(+) T lymphocyte counts among patients with tuberculosis, AIDS-related lymphadenopathy and Penicillium diseases were significantly different (χ(2) = 8.861, P = 0.012). A significant correlation between the incidence of superficial lymphadenopathy and CD4(+) T lymphocyte counts was found (χ(2) = 375.41, P = 0.000). CONCLUSIONS: The most common cause of superficial lymphadenopathy in HIV/AIDS patients is tuberculosis, followed by lymph node reactive hyperplasia, AIDS-related lymphadenopathy and Penicillium disease. Low CD4(+) T lymphocyte count correlates with an increased incidence of superficial lymphadenopathy and the risk of opportunity infection. Therefore, determination of peripheral blood CD4(+) T lymphocyte count should become an integral marker for the early diagnosis and treatment of superficial lymphadenopathy in HIV/AIDS patients.

[Infectious lymphadenitis]. / Infektiöse Lymphadenitiden.

Infectious lymphadenitis is often biopsied in the differential diagnoses of malignant disease. Since the repertoire of lymph nodes which react to exogenous stimuli is limited, malignant lymphomas may enter the clinical and morphological differential diagnosis. In a morphological sense, infectious lymphadenitis is defined as an infection of lymph node tissue. Therefore, the effector phase of the inflammatory reaction will act against lymphatic tissue, in contrast to common physiological hyperplasia. Follicular reactions, in addition to follicular hyperplasia, are seen in HIV-associated lymphadenopathy. Other viruses, such as infectious mononucleosis, give rise to a cytotoxic T-cell reaction. Most infections, however, induce a histiocytic reaction; depending on the microorganism, this varies morphologically from a small clustered epithelioid cell reaction or histiocytic abscesses to epithelioid necrotizing granulomata.

Measurement of ribosomal RNA turnover in vivo by use of deuterium-labeled glucose.

BACKGROUND: Most methods for estimation of rates of RNA production are not applicable in human in vivo clinical studies. We describe here an approach for measuring ribosomal RNA turnover in vivo using [6,6-(2)H(2)]-glucose as a precursor for de novo RNA synthesis. Because this method involves neither radioactivity nor toxic metabolites, it is suitable for human studies. METHODS: For method development in vitro, a lymphocyte cell line (PM1) was cultured in the presence of [6,6-(2)H(2)]-glucose. RNA was extracted, hydrolyzed enzymatically to ribonucleosides, and derivatized to either the aldonitrile tetra-acetate or the pentafluoro triacetate derivative of the pentose before GC-MS. We identified optimum derivatization and analysis conditions and demonstrated quantitative incorporation of deuterium from glucose into RNA of dividing cells. RESULTS: Pilot clinical studies demonstrated the applicability of this approach to blood leukocytes and solid tissues. A patient with chronic lymphocytic leukemia received [6,6-(2)H(2)]-glucose (1 g/kg) orally in aliquots administered every 30 min for a period of 10 h. When we analyzed CD3(-) B cells that had been purified by gradient centrifugation and magnetic-bead adhesion, we observed deuterium enrichment, a finding consistent with a ribosomal RNA production rate of about 7%/day, despite the slow division rates observed in concurrent DNA-labeling analysis. Similarly, in 2 patients with malignant infiltration of lymph nodes, administration of [6,6-(2)H(2)]-glucose (by intravenous infusion for 24 h) before excision biopsy allowed estimation of DNA and RNA turnover in lymph node samples. CONCLUSIONS: Our study results demonstrate the proof-of-principle that deuterium-labeled glucose may be used to analyze RNA turnover, in addition to DNA production/cell proliferation, in clinical samples.

The tissue micro-array data exchange specification: a web based experience browsing imported data.

BACKGROUND: The AIDS and Cancer Specimen Resource (ACSR) is an HIV/AIDS tissue bank consortium sponsored by the National Cancer Institute (NCI) Division of Cancer Treatment and Diagnosis (DCTD). The ACSR offers to approved researchers HIV infected biologic samples and uninfected control tissues including tissue cores in micro-arrays (TMA) accompanied by de-identified clinical data. Researchers interested in the type and quality of TMA tissue cores and the associated clinical data need an efficient method for viewing available TMA materials. Because each of the tissue samples within a TMA has separate data including a core tissue digital image and clinical data, an organized, standard approach to producing, navigating and publishing such data is necessary. The Association for Pathology Informatics (API) extensible mark-up language (XML) TMA data exchange specification (TMA DES) proposed in April 2003 provides a common format for TMA data. Exporting TMA data into the proposed format offers an opportunity to implement the API TMA DES. Using our public BrowseTMA tool, we created a web site that organizes and cross references TMA lists, digital "virtual slide" images, TMA DES export data, linked legends and clinical details for researchers. Microsoft Excel and Microsoft Word are used to convert tabular clinical data and produce an XML file in the TMA DES format. The BrowseTMA tool contains Extensible Stylesheet Language Transformation (XSLT) scripts that convert XML data into Hyper-Text Mark-up Language (HTML) web pages with hyperlinks automatically added to allow rapid navigation. RESULTS: Block lists, virtual slide images, legends, clinical details and exports have been placed on the ACSR web site for 14 blocks with 1623 cores of 2.0, 1.0 and 0.6 mm sizes. Our virtual microscope can be used to view and annotate these TMA images. Researchers can readily navigate from TMA block lists to TMA legends and to clinical details for a selected tissue core. Exports for 11 blocks with 3812 cores from three other institutions were processed with the BrowseTMA tool. Fifty common data elements (CDE) from the TMA DES were used and 42 more created for site-specific data. Researchers can download TMA clinical data in the TMA DES format. CONCLUSION: Virtual TMAs with clinical data can be viewed on the Internet by interested researchers using the BrowseTMA tool. We have organized our approach to producing, sorting, navigating and publishing TMA information to facilitate such review. We have converted Excel TMA data into TMA DES XML, and imported it and TMA DES XML from another institution into BrowseTMA to produce web pages that allow us to browse through the merged data. We proposed enhancements to the TMA DES as a result of this experience. We implemented improvements to the API TMA DES as a result of using exported data from several institutions. A document type definition was written for the API TMA DES (that optionally includes proposed enhancements). Independent validators can be used to check exports against the DTD (with or without the proposed enhancements). Linking tissue core images to readily navigable clinical data greatly improves the value of the TMA.

The tissue microarray data exchange specification: a document type definition to validate and enhance XML data.

BACKGROUND: The Association for Pathology Informatics (API) Extensible Mark-up Language (XML) TMA Data Exchange Specification (TMA DES) proposed in April 2003 provides a community-based, open source tool for sharing tissue microarray (TMA) data in a common format. Each tissue core within an array has separate data including digital images; therefore an organized, common approach to produce, navigate and publish such data facilitates viewing, sharing and merging TMA data from different laboratories. The AIDS and Cancer Specimen Resource (ACSR) is a HIV/AIDS tissue bank consortium sponsored by the National Cancer Institute (NCI) Division of Cancer Treatment and Diagnosis (DCTD). The ACSR offers HIV-related malignancies and uninfected control tissues in microarrays (TMA) accompanied by de-identified clinical data to approved researchers. Exporting our TMA data into the proposed API specified format offers an opportunity to evaluate the API specification in an applied setting and to explore its usefulness. RESULTS: A document type definition (DTD) that governs the allowed common data elements (CDE) in TMA DES export XML files was written, tested and evolved and is in routine use by the ACSR. This DTD defines TMA DES CDEs which are implemented in an external file that can be supplemented by internal DTD extensions for locally defined TMA data elements (LDE). CONCLUSION: ACSR implementation of the TMA DES demonstrated the utility of the specification and allowed application of a DTD to validate the language of the API specified XML elements and to identify possible enhancements within our TMA data management application. Improvements to the specification have additionally been suggested by our experience in importing other institution's exported TMA data. Enhancements to TMA DES to remove ambiguous situations and clarify the data should be considered. Better specified identifiers and hierarchical relationships will make automatic use of the data possible. Our tool can be used to reorder data and add identifiers; upgrading data for changes in the specification can be automatically accomplished. Using a DTD (optionally reflecting our proposed enhancements) can provide stronger validation of exported TMA data.

[Pathology of AIDS-related lymphadenopathy: a study of 18 biopsy cases].

OBJECTIVE: To study the clinicopathologic features of acquired immunodeficiency syndrome (AIDS)-related lymphadenopathy and to elucidate the salient features helpful in achieving a correct pathologic differentiated diagnosis. METHODS: Eighteen cases of AIDS-related lymphadenopathy were retrieved from the files of the First Affiliated Hospital of Guangxi Medical University from 2001 to 2004. Histochemical stains, including periodic acid-Schiff, acid-fast, Giemsa, Grocott stains and immunohistochemistry (EnVision method), were used to detect the presence of pathogens in tissue sections and classify them. RESULTS: Fifteen of the 18 cases (83%) were stage 4 (i.e. follicular and lymphocytic depletion). Twelve cases were co-infected with Penicillium marneffei and 4 other cases with Mycobacterium, and no pathogen was found in 1. The remaining patient was complicated with diffuse large B-cell lymphoma. CONCLUSIONS: When presented in early stages, AIDS-related lymphadenopathy may be overlooked, especially in routine pathology practice. Awareness of the entity in patients with persistent fever and generalized lymphadenopathy is thus crucial. Florid infection with Penicillium marneffei is also considered as an important predictor for underlying AIDS. Thorough understanding of morphologic features of AIDS-related lymphadenopathy, including possible co-infection, is essential in arriving at the correct diagnosis.

Fine needle aspiration diagnosis in HIV-related lymphadenopathy in Mangalore, India.

OBJECTIVE: To evaluate the usefulness of fine needle aspiration (FNA) study of lymph nodes in HIV-positive patients. STUDY DESIGN: The study was conducted at Kasturba Medical College, Mangalore, India. Samples from lymph nodes of 48 HIV-positive patients were taken and air dried, and wet smears were made. After staining with routine cytologic stains and special stains, detailed cytomorphologic study was conducted. RESULTS: Tuberculosis accounted for nearly half (48%) the cases,followed by HIV lymphadenitis (36%), lymphoma (10%), suppurative lymphadenitis (2%), Mycobacterium avium-intracellulare lymphadenitis (2%) and metastases (2%), in descending order of their frequency. A suppurative picture, which was found in 13% of cases of tuberculous lymphadenitis in AIDS patients, occasionally was misleading without the help of acid fast bacilli stain. CONCLUSION: FNA is a useful tool in the diagnosis of lymphadenopathy in HIV-positive patients provided that proper safety measures are taken to avoid contracting the infection.

[Opportunistic infections and HIV-associated malignancies. An evaluation of 58 autopsy cases within 10 years]. / AIDS--Opportunistische Infektionen und HIV-assoziierte maligne Erkrankungen. Eine Auswertung von 58 Sektionsfällen aus einem Zeitraum von zehn Jahren.

PATIENTS AND METHODS: Of all patients who died of HIV infection within 10 years (1. 1. 1988 to 31. 12. 1997) at the Klinikum Nürnberg 58 autopsy cases were reviewed at the Institute of Pathology of the above mentioned hospital. RESULTS: The male:female ratio was 2.1:1, the mean age being 40.5 years. Most of the patients showed an advanced stage of lymphadenopathy at the moment of death. Non-Hodgkin's lymphoma and Kaposi's sarcoma, both HIV-related malignant diseases, were diagnosed in 6/58 cases, 10.3% each. HIV-related myelodysplastic changes existed in 28/58 patients (48.3%). Twelve patients showed an HIV-associated encephalopathy (20.7%). Opportunistic infections (pneumocystis carinii, cytomegaly, toxoplasmosis, atypical mycobacteriosis) were found in 28/58 patients (48.3%). A mycosis was diagnosed in 9/58 cases (15.5%). Tuberculosis was identified in 4/58 patients (6.9%). Cirrhosis of the liver was ascertained in 8/58 patients (13.8%). 24/58 patients (41.4%) died of respiratory disorder. CONCLUSION: In the acquired immunodeficiency syndrome numerous morphological findings will be helpful in diagnosis and therapy.

[An autopsy case of AIDS complicated with cytomegalovirus infection and multiple Kaposi's sarcoma].

Cutaneous Kaposi's sarcoma (KS) is a well-known complication of the acquired immunodeficiency syndrome. KS in the internal organs, however, is rare in Japan. We present here a 33-years-old Japanese homosexual man who had AIDS complicated with cytomegalovirus (CMV) infection and KS. He was found to be HIV-seropositive, when he was 31-years-old. He visited our hospital in June 1996 because of high fever. The peripheral blood CD4+ lymphocyte counts were 2 per cubic millimeter, and CMV antigenemia was noted (p65 antigen positive cells; 240/50,000 white blood cells). Thereafter he was successfully treated with parental ganciclovir. On admission, some brown-colored flat nodules were found on the skin, and the diagnosis of KS was made by skin biopsy. We administrated human chorionic gonadotropin (hCG) for the treatment of KS, but had no clinical response. In September 1996, he complained of severe cough, shortness of breath, and vomiting. A chest radiogram showed nodular lesions and pleural effusion in bilateral lungs. A computed tomography of his chest also revealed nodular and linear densities distributed along the bronchovascular bundles. The ultrasonic examination of his abdomen revealed a duodenal nodule. Both nodules in the lungs and duodenum were proved to be KS based on the autopsy findings. Intranuclear inclusionbodies pathognomonic for CMV infections were detected in the stomach and the colon.

Soluble factor of transformed B lymphocytes in patients with HIV infection stimulates monocytes to produce PGE2.

Prostaglandins of the E series (PGE) were measured in the culture supernatants of peripheral blood mono-nuclear cells (PBMC) obtained from patients with human immunodeficiency virus (HIV) infection. Cell culture supernatants from 6 patients with acquired immunodeficiency disease (AIDS) and 11 patients with AIDS-related complex contained significantly higher concentrations of PGE than those from a group of 6 healthy HIV-negative male homosexual control subjects. The PGE producer cells were among the population of plastic-adherent PBMC. Transformed B lymphocyte cell lines spontaneously derived from the blood of patients with AIDS secrete a factor that stimulates normal donor adherent PBMC to produce PGE. The HIV permissive H9 cell line stimulated a significantly lower level of PGE production, which was not associated with HIV infection.

Antibody to the ligand for CD40 (gp39) inhibits murine AIDS-associated splenomegaly, hypergammaglobulinemia, and immunodeficiency in disease-susceptible C57BL/6 mice.

Infection of genetically susceptible C57BL/6 mice with the LP-BM5 isolate of murine retroviruses cause profound splenomegaly, hypergammaglobulinemia, lymphadenopathy, and an immunodeficiency syndrome which includes the development of terminal B-cell lymphomas. Because many of these and the other manifestations of LP-BM5 virus-induced disease are similar to those seen in AIDS, this syndrome has been named murine AIDS, or MAIDS. Previous reports have shown that the onset of MAIDS depends on the presence of both CD4+ T cells and B cells and have suggested that CD4+ T-cell-B-cell interactions are important to disease pathogenesis. Here, we assessed the possibility that interactions between CD40 and its ligand on activated CD4+ T cells, CD40 ligand/gp39, are involved in the development of MAIDS. To test this hypothesis, LP-BM5-infected B6 mice were treated in vivo with anti-gp39 monoclonal antibody. As a result, MAIDS-associated splenomegaly, hypergammaglobulinemia, germinal center formation, and the loss of in vitro responsiveness to the T- and B-cell mitogens concanavalin A and lipopolysaccharide were inhibited. Anti-gp39 monoclonal antibody-treated LP-BM5-infected mice were also able to mount essentially normal alloantigen-specific cytolytic T-lymphocyte responses. These results support the possibility that molecular interactions between CD40 and gp39 are critical to the development of MAIDS.