An immunophenotypic and molecular study of primary large B-cell lymphoma of bone

Primary non-Hodgkin's lymphomas of bone (PNHLB) is a rare form of extranodal lymphoma. Many studies have reported the clinical, radiologic, and histopathologic characteristics of PNHLB; however, their molecular features have not been well studied. In this report, we present the immunophenotypic and molecular characteristics of 20 primary large B-cell lymphoma (PLBCL) of bone from 20 adults. Most demonstrated centroblastic morphology, with the majority exhibiting nuclear multilobation. One case (5%) demonstrated anaplastic features with strong CD30 expression but was ALK-1 negative. BCL-6 expression was seen in 6 of 20 cases, and strong p53 protein expression was seen in 11 of 20 (55%) cases. The majority of cases analyzed (13/18 = 72%) demonstrated a clonal B-cell process by IgH gene rearrangement studies. Of the five cases that did not demonstrate a clonal population, two expressed BCL-6 protein. No cases demonstrated a bcl-2/JH rearrangement, but BCL-2 protein expression was seen in 11 of 20 (55%) cases. In summary, primary lymphoma of bone is largely a non-Hodgkin's lymphoma of large B-cell type. Our studies demonstrate that p53 and BCL-2 expression may play a role in the pathogenesis of PLCBL of bone. In addition, a subset of the cases are of putative germinal center B-cell origin based on the expression of BCL-6 protein and may be genetically distinct from follicle center lymphomas. The results provide evidence for molecular heterogeneity within primary large B-cell lymphomas of bone.

Isolation and morphological characterisation of UHMWPE wear debris generated in vitro

Wear tests are generally carried out on materials used in prosthetic hip implants, in order to obtain a better understanding of the tribological processes involved and improve the quality control of joint prostheses, directed towards reducing the risk of implant failure of innovative prostheses. Ceramic femoral heads of mixed alumina-zirconia oxides as well as zirconia and alumina single oxide heads were tested against UHMWPE acetabular cups in a hip joint simulator. Polyethylene cups and ceramic femoral heads were mounted in a simulator apparatus moving according to a sinusoidal function, under load and in the presence of bovine calf serum as lubricant. Wear particles were isolated from the bovine calf serum collected during the wear tests. An easy to follow method was used to separate the wear particles from the lubricant. Chemical digestive methods were used to separate the wear particles from the lubricant and the isolated particles were studied using scanning electron microscopy. The morphologies of the polyethylene debris showed considerable differences, both in size and shape of the particles, as a function of the coupled head material.

Gelatinous transformation of bone marrow from a starch-free diet

Gelatinous marrow transformation is characterized by marrow hypoplasia, fat atrophy, and gelatinous material deposition, and usually develops as a hematologic complication of chronic wasting disorders. Most of the cases associated with severe nutritional deficiency were seen in anorexia nervosa due to a depletion of protein or fat. This report describes a case of gelatinous transformation attributed to a specific restriction of carbohydrates in diet. The hematologic deficiency was eventually recovered after the patient resumed a regular starch-containing diet. This brief report illustrates the potential side effect of the compulsive dietary behavior on the hematologic system.

Malignant lymphoma of mucosa-associated lymphoid tissue of the lacrimal gland: case report and review of literature

Mucosa-associated lymphoid tissue (MALT) lymphomas are increasingly recognized as a distinct clinical-pathologic entity among the non-Hodgkin's lymphomas. It usually presents as a localized disease process in extranodal tissues or organs such as stomach, salivary gland, thyroid gland, and not infrequently in orbital adnexa. Radiotherapy has an important role in the management, although long-term clinical results specifically addressing localized MALT lymphomas are lacking. We report a case of localized MALT lymphoma of the lacrimal gland, with successful treatment by radiation therapy (total dose 25 Gy) with 3 years of clinical follow-up. A review of the published literature was undertaken to assess the role of radiotherapy in the treatment of this disease involving orbital tissues, specifically, the lacrimal gland. Based on previous reports of patients with orbital lymphomas (low grade) and pseudolymphomas, of which many will now be recognized as MALT lymphomas, radiotherapy has an excellent local control rate and would be the treatment of choice. However, long-term results of pathologically confirmed cases of MALT lymphomas need further study because occasional relapses at distant sites can occur.

Preoperative autologous blood deposition in support of gynaecological repair procedures

Autologous blood transfusion was evaluated in gynaecological repair procedures including abdominal/ vaginal hysterectomy with vaginal repair, post-hysterectomy vaginal suspension and fixation, uni/bilateral salpingo-oophorectomy with vaginal colpopexy and sling procedures. A total of 247 autologous units were collected from 95 patients at the regional blood centre with 1-3 units (mean 2-6 units) deposition from each patient. One hundred and ninety of all collected units were transfused (collection/transfusion ratio = 1.3). Of these patients, 86 (90.5%) received autologous blood; 12 (13%) being transfused with 1 unit, 44 (46%) with 2 units and 30 (32%) with 3 units. Two of these patients received additional homologous blood. The average preoperative haemoglobin level was 119 g L-1 and average post-operative haemoglobin level was 105 gL-1. The post-operative Hb level was used as a retrospective indicator for the requirement for blood transfusion. The results show that overall 75% of patients had post-operative haemoglobin levels < or = 110 and 33% of patients with Hb levels < 100, respectively. These results suggest that preoperative autologous blood deposition may be appropriate in the patients undergoing reconstructive gynaecological repair procedures since there was a high rate of usage of autologous blood and low post-operative haemoglobin in a significant proportion of patients.

Dominantly transmitted beta-thalassemia arising from the production of several aberrant mRNA species and one abnormal peptide

We describe a dominantly inherited beta-thalassemia intermedia phenotype observed in a five-generation Portuguese family. Carriers are characterized by moderate anemia, hypochromia, microcytosis, elevated hemoglobin (Hb)A2 and HbF levels, splenomegaly, hepatomegaly, and inclusion bodies in peripheral red blood cells after splenectomy. The molecular basis of this condition is a small deletion within the 5' consensus splicing sequence of the second intron of the beta-globin gene, IVS-II-4,5 (-AG). Reticulocyte RNA studies performed by reverse transcription-polymerase chain reaction (RT-PCR) and primer extension analysis showed three abnormally processed transcripts, which, upon sequencing, were shown to correspond to (1) skipping of exon 2, and (2) activation of two cryptic splice sites (between codons 59/60, and at IVS-II-47). In vitro translation studies of these patients' reticulocyte RNA have shown that at least one of these aberrant mRNA species is translated into an abnormally elongated peptide whose cytotoxic properties could, in part, be causing the atypical dominant mode of inheritance observed in this family. We suggest that this elongated beta chain is unable to combine with an alpha-globin chain to form a functional Hb molecule. Its degradation would, then, exhaust the proteolytic defense mechanism of the erythroid precursors, leading to inefficient proteolysis of the free alpha chains in excess.

Physiologic human T-cell responses to OKT3 in the human peripheral blood lymphocyte-severe combined immunodeficiency mouse model

BACKGROUND

Our goal was to study physiologic responses of human T lymphocytes to OKT3 in the human peripheral blood lymphocyte-severe combined immunodeficiency (hu-PBL-SCID) mouse model.

METHODS

SCID mice were pretreated with anti-asialo-GM1 (alpha-ASGM1) and radiation, then engrafted with human peripheral blood lymphocytes (PBLs). Seven to 14 days after engraftment, when most human T cells in the spleen of these mice are CD3+/CD4+ and CD3+/CD8+, mice were treated with OKT3 or control antibody. Mice were killed for histopathologic examination, for flow cytometric assessment of the engrafted human lymphocytes, and for analysis of human tumor necrosis factor-alpha serum levels.

RESULTS

Intravenous injection of 5 microg of OKT3 resulted in early antigenic modulation of engrafted human T lymphocytes, with the emergence of CD3-/CD4+ and CD3-/CD8+ cells in the spleen of hu-PBL-SCID mice. There was an increase in the serum concentration of human tumor necrosis factor-alpha within 4 hr after OKT3 injection, suggesting early T-cell activation. Antigenic modulation and activation of the human lymphocytes in the spleen was followed by their depletion within 24 hr. This human T-cell response to OKT3 in hu-PBL-SCID mice is analogous to the response in humans treated with OKT3 and in BALB/c mice injected with an anti-murine CD3 monoclonal antibody. Graft-versus-host disease in the mice was abrogated by OKT3 treatment, and OKT3-treated mice lived longer than controls. Histopathologic studies showed clearance of lymphocytic infiltration in the liver and lungs of OKT3-treated mice.

CONCLUSIONS

These findings provide further evidence of functional human immune T cells in the hu-PBL-SCID mouse. This model may have useful applications in the study of transplantation immunology.

Regional cancer cytogenetics: a report on 1,143 diagnostic cases

The results of studies from a regional cancer cytogenetics diagnostic service are reported. In a 10-year period, 1,143 marrow samples from patients with newly diagnosed leukemia and myelodysplastic syndrome were referred. Successful studies were completed on 992 cases (87%). Among all referred cases, the rates of detection of cytogenetically abnormal clones were 95% for chronic myelogenous leukemia (CML), 54% for acute lymphoblastic leukemia (ALL), 51% for acute myeloid leukemia (ANLL), and 43% for myelodysplastic syndrome (MDS). Of 169 cases of CML studied, 90.5% bore the standard Philadelphia chromosome (Ph), 3.55% had an unusual Ph, and 5.33% were Ph-negative. Among the 59 cases of cytogenetically abnormal MDS, common abnormalities observed were trisomy 8 and changes resulting in loss of material from the long arm of chromosomes 5 and 7, and 20q-. Of the 168 abnormal ANLL, there was a strikingly non-random pattern of aneuploidy, with monosomy 7 and trisomy 8 predominating. Common structural changes observed were changes resulting in loss of material from the long arm of chromosomes 5 and 7, trisomy 8, rearrangements of 11q23, t(15;17), t(8;21), rearrangements of 12q13 and 3q, inversion 16, trisomy 11, Ph, trisomy 21, t(6;9) and t(1;22). The differences between adult and pediatric findings were minor, with the exception of chromosome 5 abnormalities, which were common among adults with ANLL but rare in the pediatric cases. There were 273 ALLs with abnormal cytogenetic findings. There was preferential gain of chromosomes 21, X, 14, 6, 4, 18, 17, and 10 (in decreasing order of frequency) in leukemic clones. Of the 193 ALLs with structural changes, many fell into-well-defined categories with established correlations to FAB subtypes. Common changes in ALL were rearrangements of 9p, 12p, 6q, TCR loci, 11q23, Ig loci, and 8q24, and duplication of 1q, Ph, i(17q), t(1;19), i(9q) and dic(9;12). The detailed documentation of the cytogenetic findings in this relatively large, single-institution study will likely facilitate the further characterization of rare, primary cytogenetic changes associated with leukemias and MDS. From a managed health care perspective, regional cancer cytogenetic services may be cost-effective alternatives to single-institution laboratories.

Functional characterization of the prostanoid DP receptor in human myometrium

Spontaneous contractile activity of strips of human myometrium obtained from non-pregnant donors at the time of hysterectomy was inhibited by the selective prostanoid DP receptor agonists BW 245C (5-(6-carboxyhexyl)-1-(3-cyclohexyl-3-hydroxypropyl)hydantoin) and ZK110841 ((5Z,13E)-(9R,11R,15S)-9 beta-chlor-15-cyclohexyl-11,15-dihydroxy-16,17,18,19, 20-pentanor-5,13-prostadienoic acid) with pEC50 values of 8.4 and 7.3 respectively but prostaglandin D2 produced a biphasic effect. In the presence of the TP receptor antagonist L670596 ((-)-6,8-difluoro-9-p-methylsulfonyl benzyl-1,2,3,4-tetrahydrocarbazol-1-yl-acetic acid), contractile activity induced by the FP receptor agonist, cloprostenol ([1R-[1 alpha(Z),2 beta(1E,3R),3 alpha,5 alpha]]-7-[2-[4-(3- chlorophenoxy)-3-hydroxy-7-butenyl]-3,5-dihydroxycyclopentyl]-5-he ptenoic acid), was inhibited by BW 245C (pEC50 = 7.5), ZK110841 (pEC50 = 6.7) and prostaglandin D2 (pEC50 = 6.3). Under these conditions both prostaglandin J2 and 9 alpha,11 beta-prostaglandin F2 were inhibitory partial agonists. All compounds were antagonized by the selective DP receptor antagonist BW A868C (3-benzyl-5-(6-carboxyhexyl)-1-(2-cyclohexyl-2-hydroxyethylamino)h ydantoin), but the pKB values were both concentration-dependent (pKB versus BW 245C at 10 nM = 9.1, at 50 nM = 8.3) and agonist-dependent (pKB at 10 nM versus BW 245C = 9.1, versus ZK110841 = 7.4). Both agonist and antagonist potencies support the existence of DP receptors in human myometrium. The concentration and agonist dependence of the action of BW A868C suggests that putative DP receptor agonists relax human myometrium by more than one mechanism. These observations may be explained by the existence of subtypes of DP receptor in human myometrium.

Angiopeptin (BIM23014C) inhibits vascular smooth muscle cell migration in vitro through a G-protein-mediated pathway and is associated with inhibition of adenylyl cyclase and cyclic AMP accumulation

Angiopeptin (AP: BIM23014C), a cyclic analogue of the peptide hormone somatostatin, inhibits intimal hyperplasia after balloon angioplasty. This inhibition has been attributed to a direct inhibitory effect on smooth muscle cell (SMC) proliferation. However, the SMC that proliferate in the intima and contribute to intimal hyperplasia arrive there by migrating from the injured media, suggesting that SMC migration may also play an important role in this process. Indeed, in the experiments we describe, AP inhibited the migration of rat aortic SMC cells (RA-SMC) in response to type I collagen, the predominant form of collagen in the vessel media, and did so dose dependently. RA-SMC migration was inhibited 70% in the presence of AP 100 nM. RA-SMC adhesion to type I collagen in these conditions was not inhibited, suggesting that AP does not interfere with RA-SMC recognition of type I collagen; instead, it blocks subsequent signaling events that are necessary for RA-SMC migration in response to type I collagen. AP inhibited the forskolin-stimulated accumulation of cyclic AMP by RA-SMC (35% at 30 nM). In addition, pertussis toxin (PT), which blocks Gi-mediated inhibition of adenylyl cyclase, blocked the inhibitory effect of AP on cyclic AMP (cAMP) accumulation and also blocked the inhibitory effect of AP on RA-SMC migration. These findings suggest that the inhibitory effect of AP on intimal hyperplasia is due at least in part to its effects on SMC migration and that these effects are mediated by a Gi-dependent pathway and may involve inhibition of adenylyl cyclase and cAMP accumulation.

A phase I study of swainsonine in patients with advanced malignancies

Swainsonine, an alpha-mannosidase inhibitor which blocks Golgi oligosaccharide processing, represents a new class of compounds that inhibit both rate of tumor growth, and metastasis, in murine experimental tumor models. In this first phase I study, the quantitative and qualitative toxicities of swainsonine have been studied in patients given a continuous i.v. infusion over 5 days, repeated at 28-day intervals. Dose levels were escalated in increments of 100 micrograms/kg/day from 50-550 micrograms/kg/day. Nineteen patients with both solid tumor and hematological malignancies were given a total of 31 courses. Hepatotoxicity, particularly in patients with liver metastases, was the dose-limiting toxicity. The maximum tolerated dose (MTD) and the recommended starting dose (MTD -1 level) were 550 and 450 micrograms/kg/day, respectively. Common side effects included edema, mild liver dysfunction, a rise in serum amylase, and decreased serum retinol. Acute respiratory distress syndrome possibly precipitated by swainsonine resulted in a treatment-related death in a patient with significant pretreatment hepatic dysfunction. One patient with head and neck cancer showed > 50% shrinkage of tumor mass for 6 weeks after treatment. Two patients with lymphangitis carcinomatosis on chest X-ray noted improvement in cough and shortness of breath during the infusion of swainsonine and for 1 week thereafter. Clearance and serum half-life for swainsonine were determined to be approximately 2 ml/h/kg, and 0.5 day, respectively. Golgi oligosaccharide processing, a putative anticancer target for swainsonine was inhibited in peripheral blood lymphocytes as evidenced by a marked decrease in leukoagglutinin binding after 5 days of treatment. Oligomannosides in patient urine increased 5-to 10-fold over the 5 days of treatment, indicating that tissue lysosomal alpha-mannosidases were also blocked by swainsonine. Urine oligomannoside accumulation reached steady state at 3 days, approximately 1 day after serum drug levels reached steady state. The fraction of HLA-DR-positive cells in peripheral blood lymphocytes increased following 5 days of swainsonine treatment, an effect similar to that observed for peripheral blood lymphocytes from normal subjects cultured with swainsonine. No significant changes in CD3, CD4, CD8, CD16, and CD25 were observed. Swainsonine produces minimal toxicity when administered i.v. to cancer patients at dosages that inhibit both Golgi alpha-mannosidase II and lysosomal alpha-mannosidases. Detection of hepatic metastases or liver enzyme abnormalities prior to treatment predict for more significant toxicity.

Primary non-Hodgkin's lymphoma of bone. A clinicopathologic study

BACKGROUND

This study relates our experience in the diagnosis and treatment of a rare clinical entity, non-Hodgkin's primary lymphoma of bone.

METHODS

Seventeen cases of patients with primary lymphoma of bone diagnosed and treated at a single institution between 1975 and 1992 are reviewed. Ten patients received combined-modality therapy, consisting of an anthracycline-containing combination chemotherapy (CT) regimen, followed by adjuvant radiotherapy (RT) to the primary site of disease. Five patients were treated with CT alone; one patient received RT alone; and one patient was treated with CT after emergency RT for spinal cord compression.

RESULTS

Thirteen patients presented with Stage I disease, two with Stage II; and two with Stage IV disease (multiple bony sites only). Thirteen patients had an intermediate-grade diffuse large cell lymphoma; two had an intermediate-grade mixed small and large cell lymphoma; and two had a high-grade lymphoma (one immunoblastic and one small non-cleaved cell lymphoma). The overall response rate was 94% (18% complete response, 58% partial response 1, and 18% partial response 2). Thirteen patients are alive and disease-free at a median of 29 months; 10 of these received CT+RT, and 3 received CT alone. Three patients have died; one of these received CT+RT and one CT alone, and one relapsed immediately after CT. One patient, who was initially treated with RT and then with CT+RT after relapse, was lost to follow-up 40 months from the start of treatment.

CONCLUSIONS

Because experience in the literature suggests a 50% distant relapse rate in primary lymphoma of bone treated with RT alone, our policy is to treat all patients with combined-modality therapy (CT+RT). However, only a Phase III randomized, controlled clinical trial will determine whether CT+RT is superior to either modality alone.

Effects of interferon-alpha therapy on serum and liver HBV DNA in patients with chronic hepatitis B

The aim of this study was to evaluate the effect of interferon-alpha therapy on serum and liver HBV DNA in 20 patients with chronic hepatitis B and to correlate the presence or absence of HBV DNA with the clinical response. There were 11 responders and all lost HBV DNA from the serum. Ten of the 11 were followed for 36 months following IFN treatment and remained well with absence of HBeAg and HBV DNA from the serum and with normal ALT. Five also lost HBsAg. HBV DNA became undetectable in the liver of nine of 10 of these patients in whom liver tissue was available for study. HBV DNA persisted in the liver of seven of nine nonresponders and was not detected in two in spite of the presence of HBV DNA and HBeAg in the serum of these two patients. We conclude that IFN may induce long remissions in patients with chronic hepatitis B with loss of HBV DNA from the serum and that occasionally HBV DNA may persist in the liver of such patients.

Acute typhlitis in an immunocompromised host. Report of an unusual case and review of the literature

A case of acute typhlitis arising in a neutropenic male is described. Light and electron microscopy reveal findings resembling those of an early stage of malakoplakia. The coexistence of these two uncommon lesions suggests a pathogenetic role in the development of septicemia in immunocompromised hosts.

Increased expression of highly branched N-linked oligosaccharides terminating in N-acetylglucosamine residues in neoplastic and sclerodermal chicken fibroblasts

Although neoplastic cells often show a shift towards the expression of larger N-linked oligosaccharides compared to their normal counterparts, little consideration has been given to the possibility that these changes might be a more general phenomenon characteristic of certain neoplastic and non-neoplastic proliferative disorders. Terminal N-acetylglucosamine (GlcNAc) cluster antigen (TGCA) is an immunoreactive epitope(s) of highly branched N-linked oligosaccharides terminating in GlcNAc residues. Here we have compared the expression of this antigen in normal, neoplastic and sclerodermal chicken fibroblasts by immunomorphological methods. TGCA was detectable in only a few, if any, fibroblasts of normal chicken skin or those cultured from chicken embryos. In contrast, the antigen appeared in 15 to 30% of chicken embryo fibroblasts transformed with avian sarcoma viruses and about 50% of neoplastic fibroblasts of both Rous sarcoma virus-induced fibrosarcomas and carcinogen-induced transplantable fibrosarcomas. Significantly, TGCA was also found in most activated fibroblasts in the skin of chickens with hereditary scleroderma. These results indicate that increased expression of highly branched N-linked oligosaccharides terminating in GlcNAc residues is characteristic of both neoplastic and sclerodermal chicken fibroblasts. Investigation of this phenomenon may thus provide insight into biochemical pathways involved in neoplastic transformation and pathogenesis of a number of non-neoplastic proliferative connective tissue disorders such as scleroderma. Moreover, changes in the expression of TGCA-positive oligosaccharides (or their modified biochemical counterparts in mammalian species) may have considerable value for diagnosis of several connective tissue diseases.

Beta 1-6 branched oligosaccharides as a marker of tumor progression in human breast and colon neoplasia

Malignant transformation of murine and human cells is commonly associated with increased--GlcNAc beta 1-6Man alpha 1-6Man beta--branching in asparagine-linked oligosaccharides. Somatic mutations and drugs which block expression of the beta 1-6 branched oligosaccharides are potent inhibitors of tumor cell invasion and metastasis in animal models. This suggests that the oligosaccharides are required for metastasis to occur and therefore their increased presence in primary tumors may be diagnostic of metastatic disease. Although antibodies to the beta 1-6 branched portion of the oligosaccharides are not available, a plant lectin leukoagglutinin (L-PHA) has been shown to bind specifically to this structure. L-PHA lectin histochemistry was performed on paraffin sections of human breast and colon tissues. All breast carcinomas and epithelial hyperplasia with atypia showed significantly increased L-PHA staining compared to fibroadenomas and hyperplasia without atypia. In histological sections of colon, adenomas showed a small but significant increase in L-PHA staining compared to normal colonic epithelium, while carcinomas showed greatly increased reactivity. In addition, Dukes stage C tumors showed higher levels of L-PHA staining than stage A tumors. These results demonstrate that L-PHA-reactive beta 1-6 branched N-linked oligosaccharides are consistently increased in neoplasias of human breast and colon and that the level of L-PHA staining correlates with the pathological staging of the diseases.

Intraoperative ultrasound in the conservative resection of testicular neoplasms

In a series of approximately 400 patients investigated for oligospermia 4 had small testicular tumors demonstrated by high resolution real-time ultrasound. The lesions ranged in size from 3 to 6 mm., were clinically impalpable and were demonstrated on repeated sonograms. Exploration was done in all 4 patients with the aid of intraoperative high resolution ultrasound. This procedure allowed for conservative resection of the tumor with preservation of the testicle. The pathological diagnosis in all cases was benign Leydig cell tumor.

Immunohistochemical study of ontogeny and phylogeny of a terminal N-acetylglucosamine cluster antigen

In this work an immunohistochemical method was used to study the ontogeny and phylogeny of a terminal N-acetylglucosamine (GlcNAc) cluster antigen which is an epitope(s) of highly branched N-linked oligosaccharides terminating in GlcNAc residues. The ontogenic studies demonstrated that expression of the antigen is developmentally regulated in lymphocytes, epithelial cells of endodermal origin and kidney mesangial cells of the chicken. The antigen was found in several other avian species studied, namely, the Japanese quail, duck, goose and turkey. Furthermore, the distribution of the antigen in all these species was similar. In adult animals, it was found in bursal and thymic lymphocytes, macrophages, spleen reticulum cells, epithelial cells of the intestine and bronchioles and capillary endothelial cells. The antigen was also detected in epithelial cells of the gastrointestinal tract of several lower vertebrates studied: the amphibian (frog), reptile (chameleon) and fish (rainbow trout). It was undetectable in various organs of the human, African green monkey, calf, pig, rat and guinea-pig, but was found in the intestinal epithelial cells of ten mouse strains. It is likely that biosynthetic processing leading to the formation of highly branched N-linked glycans terminating in GlcNAc residues is conserved during evolution in birds and other lower vertebrates.

Granulocyte precursors are the principal cells in bone marrow that stimulate allospecific cytolytic T-lymphocyte responses

Mouse bone marrow cells were fractionated and enriched for functional activity as stimulators of allospecific cytolytic T-lymphocyte (CTL) responses in vitro. The relevant stimulator cells were enriched sequentially in the low-density fraction of bone marrow, its 2-hr adherent and 18-hr non-adherent fractions and in the FcR-negative fraction of 18-hr non-adherent cells. The functionally enriched cell population contained over 90% granulocyte precursors by ultrastructural analysis. The results indicate that granulocyte precursors are the principal cells in bone marrow that stimulate alloreactive T-cell responses.

Ileal perforation due to cytomegaloviral enteritis

As the AIDS epidemic unfolds, many newly described clinical syndromes resulting from unusual manifestations of opportunistic infections are being seen. The authors report the clinical and pathological features of intestinal perforation in an AIDS patient caused by extensive small-bowel ulcerations due to cytomegalovirus. The diagnosis was confirmed by ultrastructural and immunohistochemical studies. It is suggested that infection and destruction of the muscularis propria by the virus contributes to intestinal perforation.

Novel heterophile chicken antigen: immunohistochemical localization using antisera to Mycobacterium smegmatis and possible association with lymphocyte maturation

A novel heterophile antigen shared by Mycobacterium smegmatis and chicken tissues was demonstrated by the indirect immunoperoxidase method using antisera raised in rabbits immunized with a complete Freund's adjuvant containing killed Mycobacterium smegmatis as an immunostimulating component. This antigen was strongly expressed in medullary lymphocytes of the thymus and bursa of Fabricius, but was undetectable in lymphoid cells of the cortical regions of these organs. Only a few lymphocytes stained positively for the antigen in T- and B-cell areas of the spleen. These data suggest that the heterophile antigen is associated with the intrathymic and intrabursal maturation of chicken lymphocytes. The antigen was also detected in some nonlymphoid cells. It was not found in sheep erythrocytes, human and rat tissues or in killed bacillus Calmette--Guerin.

Antigen presenting cells and bone allotransplantation

Antigen presenting cells may have a direct bearing on the results of allotransplantation of bone. There is no doubt that these cells are neither T nor B lymphocytes and that they do reside in the bone marrow. Evidence suggests that these bone marrow cells are of the granulocyte lineage and that they initiate immunologic reactions in vitro. The removal of bone marrow that contains these cells from bone allografts would decrease the immunologic response to the implantation of such transplants.

Autoimmune hemolytic anemia with concurrence of warm and cold red cell autoantibodies and a warm hemolysin

This report describes the laboratory findings and clinical course of a patient with thrombophlebitis, venous gangrene, and autoimmune hemolytic anemia. Three concomitant red cell autoantibody activities were detected: a low-titer, high-thermal-amplitude, IgM anti-I cold agglutinin; an IgG warm 'incomplete' panagglutinating autoantibody; and an IgM warm hemolysin.

Immunomorphological localization of adenosine deaminase in rat tissues during ontogeny

Immunomorphological methods were used to localize adenosine deaminase in tissues of the rat at different stages of ontogeny. In the thymus, lymphocytes began to express significant amounts of the enzyme with the appearance of demarcation between the cortex and medulla at 17 days of gestation. At any stage of ontogeny studied, strong adenosine deaminase staining was seen predominantly in cortical thymocytes. In the spleen and lymph node, the enzyme was initially detected in T cell areas, whereas primary follicles did not show positive adenosine deaminase staining. During further development, the enzyme was demonstrated in some lymphocytes of germinal centres and plasma cells. In the duodenum, epithelial cells of villi and the neck of crypts showed positive adenosine deaminase staining whereas no staining for the enzyme was observed in the epithelial cells of the base of crypts. Strongly positive staining for adenosine deaminase appeared in plasma cells of the lamina propria by four weeks after birth. The transient positive reaction for the deaminase could be recognized in epithelial cells of tubules of the kidney during late foetal and early postnatal development. The tubules of adult rats did not stain for the enzyme. In the cartilage of 15-day foetuses, positive adenosine deaminase staining was seen only in perichondrial cells and hypertrophic cells. Kupffer cells in the liver and endothelial cells of blood vessels stained positively for the enzyme at every stage of ontogeny studied.

Immunohistochemical localization of adenosine deaminase in human benign extrathymic lymphoid tissues and B-cell lymphomas

Immunomorphologic methods were utilized to localize adenosine deaminase (ADA) in extrathymic benign lymphoid tissues and B-cell lymphomas. In reactive lymph nodes, tonsils and appendix, germinal centers displayed strong ADA-positive nuclear staining in small cleaved lymphocytes and weak nuclear and/or cytoplasmic staining in large lymphoid cells. A significant proportion of ADA-positive lymphocytes in the germinal centers were B-cells. The mantle zone of secondary follicles did not stain for ADA. The plasma cells in the medullary cords demonstrated mainly cytoplasmic staining. In the spleen, ADA-positive lymphocytes were located in the periarteriolar sheath and paratrabecular white pulp. In lymphoma B-cells, patterns of ADA staining were similar to those observed in normal B-lymphocytes of similar morphology. This study demonstrated that human normal and lymphoma B-lymphoid cells are heterogeneous with respect to ADA expression. This heterogeneity appears to be associated with differentiation and/or proliferation of B-lymphocytes.

Morphologic changes and immunohistochemical localization of adenosine deaminase in tissues of rats given injections of 2'-deoxycoformycin

2'-Deoxycoformycin (DCF) is a potent inhibitor of adenosine deaminase (ADA) and a potential antineoplastic and immunosuppressive agent. In this study the kinetics of ADA expression was assessed by immunomorphologic and enzymatic methods in tissues of ACI rats given injections of DCF. The rats received a daily ip injection of 10 mg DCF/kg for 3 consecutive days. This treatment destroyed cortical thymocytes, whereas lymphocytes of the thymic medulla were mainly preserved. In control phosphate-buffered saline-injected rats, cortical thymocytes were not affected morphologically and displayed strong ADA staining. It was found unexpectedly that injections of DCF produced activation and, possibly, differentiation of B-cells in the mesenteric lymph nodes and spleen. These activated B-lymphocytes and plasma cells stained strongly for ADA. Transient changes in patterns of ADA expression were also observed in endothelial cells of blood vessels and liver Kupffer's cells, but these changes were not accompanied by degeneration of the cells. The treatment with DCF did not result in any permanent abnormalities in the rat tissues.

[The atmosphere in H. Tellenbach's phenomenologic anthropology]

The author reviews the the conceptions of Hubertus Tellenbach on the occasion of the french translation of his book Geschmack und Atmosphere... He noticed the importance of "atmospheric evaluation" in psychopathology and considers a large field of applications in literary critic.

Immunoblastic lymphadenopathy: report of four new cases and review of the disease

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Analysis of cell-mediated hypersensitivity, immune complexes and monocyte-released factor(s) in allergic alveolitis and asymptomatic exposed subjects

Patients with allergic alveolitis to various antigens, asymptomatic exposed individuals and healthy control subjects were studied. The lymphocyte transformation test and the formation of two lymphokines were shown to be positive in almost all affected subjects and only rarely in asymptomatic exposed individuals. In most symptomatic subjects and only rarely in asymptomatic exposed individuals. In most symptomatic subjects, the presence of antigen-antibody complexes could be demonstrated. However, such complexes were also present in six of the nine asymptomatic exposed individuals having precipitating antibodies. Factor(s) released from sensitized monocytes strongly facilitate the in vitro formation of specific antibodies but are poorly effective when incubated with cells from asymptomatic exposed subjects or normal individuals.

Minimal care concept. An alternative for the management of arthritis

This article is a report on the initial year of operation of the Arthritis Minimal Care Unit at the University of Texas Medical Branch at Galveston. The unit provided a comprehensive program for patient with arthritis including an interdisciplinary approach to care and patient-oriented program development with emphasis on patient and family education. The results of our program showed that hospital admission time and cost could be reduced and an improved quality of care could be provided in a Minimal Care Unit as compared to the acute hospital setting.

[Analysis of the macrophage function in sarcoidosis]

This study demonstrates that, in spite of the fairly normal functional capacity of T lymphocytes in sarcoidosis, a deficit of cell-mediated immunity frequently develops. It is shown that monocytes of sarcoidosis seem to share in responsibility for the appearance of this deficit. Soluble factors from sensitized healthy monocytes are shown to be capable of restoring this capacity.

Analysis and function of T and B cells subpopulations in sarcoidosis

Various technical procedure were applied to the purification of T and B lymphocytes subpopulation in sarcoidosis. Patients were selected according to the presence of a characterized deficit in cell-mediated immune functions. These purified lymphocytes populations were further analysed for their ability to release lymphokines in the presence of Con-A-sepharose or specific antigens. Among these factors, MIF, LIF and mitogenic factor (MF) were looked for. For the determination of MIF and LIF, a newly elaborated technique was deviced which allows a semi-quantitative approach of the lymphokine production. The following results were obtained: A decrease in the absolute number of T lymphocytes was observed among all our patients, and a increase in the number of Ig producing cells. A rather large percent (15 to 40%) of null cells which were carrying characteristic features of quiescent, non activable monocytes. The ability of T lymphocytes to release lymphokines was impaired in the presence of these monocytes but could be restored to normal levels when cells were removed. The results suggest that T cell function might be impaired, in sarcoidosis, by a non identified monocytes abnormal behaviour.

Analysis and function of T and B cell subpopulations in sarcoidosis

Studies carried out in vitro with purified T cells from patients with sarcoidosis demonstrate that: 1. There is an important loss in peripheral blood T cells in active sarcoidosis. 2. These T cells seem to be functionally normal (PHA response, lymphokine production). 3. Memory cells to previously encountered antigens are still present in anergic sarcoidosis. 4. Stimulation of memory cells need the presence of sensitized macrophages from healthy individuals. 5. The stimulation of lymphokine producing T cells also need the presence of healthy macrophages. It is suggested that the development of anergy in sarcoidosis may result at least partly, from an abnormal function of macrophages.

[Immunological aspects of pulmonary granulomatosis with special reference to sarcoidosis]

A wide variety of exogenous or endogenous aggressors exhibit the capacity to induce pulmonary granulomatous lesions. This lesion is characterized by exacerbation of phagocytic function and tentative development of a specific immune response. In many clinical situations there is a well developed circulating antibody response with deficient cell-mediated immunity of variable degree. Finally, it is argued that the granulomatous lesion may be due to abnormal cooperation between T and B lymphocytes.

Cell-mediated immunity in an ageing population

Eight hundred and eighty patients hospitalized in a geriatric hospital were routinely tested with 2, 10, 30 and 100 i.u. tuberculin. Among these, fifty-four patients were selected on the basis of negative skin tests and absence of evident diseases interfering with the function of the immune apparatus. A battery of tests analysing cell-mediated immunity was applied to those fifty-four patients. It appears that elderly patients having a negative test to 100 i.u. tuberculin show very infrequent sensitization to three other thymus-dependent antigens. The capacity of this selected population to become sensitized to DNCB is poor (20%). Furthermore they exhibit a low per cent of peripheral blood T cells (36%) and a poor capacity to respond in vitro to mitogens such as PHA. Testing the in vitro response to a battery of antigens demonstrates a good correlation with the results of the skin tests. Finally the leucocytes of 25% of this selected population failed to produce LIF in vitro in the presence of PHA. These results suggest not only an absolute decrease in the population of circulating T lymphocytes in those elderly humans; but very likely, at least in some cases, a functional impairment of T cells.

Studies on the mitogenic activity of trypsin, pronase and neuraminidase on human peripheral blood lymphocytes

Human peripheral blood lymphocytes were cultured in the presence of protease (trypsin and pronase) and Vibrio choleraneuraminidase. T and B lymphocyte populations were separated and the effect of these enzymes plus phytohaemagglutin or Tuberculin was studied. The results of these experiments show that proteases moderately stimulate spontaneous deoxynucleic acid synthesis of control cells and potentiate the effect of tuberculin on sensitized cells. These enzymes act specifically on B lymphocytes. Neuraminidase also increases spontaneous deoxyribonucleic acid synthesis of control cells and augments significantly the in vitro response to PPD. There is no additive effect of neuraminidase on phytohaemagglutin stimulated cells. Neuraminidase seems to stimulate specifically T lymphocytes. Some possible mechanisms of action of these enzymes are proposed and discussed.

[T-and B-lymphocytes in lymphoproliferative syndromes]

Using the various markers of human lymphocytes, it is possible to define, at least roughly, some malignancies of the lymphoid system in terms of their components in T and B cell subpopulations. Furthermore, the study of surface-immune globulins using labelled antisera specific for heavy and light chain classes, has made it possible to define the concept of monoclonal proliferation of B cells. Following a short description of the various interrelationships between B and T lymphocytes, the main lymphoproliferative diseases are briefly described in terms of B or T nature of tumoral cell lines and their bearing on the overall function of the immune apparatus.