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PubMed1996

The assessment of the emotional and immunological consequences of examination stress.

Sixteen final-year students and 14 nonstudents were recruited into a pilot study exploring the utility of the Merieux Multitest CMI in identifying stress-related immune impairment. The results of the investigation revealed that the examination group reported greater stress than the nonexamination group. The relationship between stress and immune impairment was explored using two widely held definitions of stress (i.e., stimulus and response). When stress was defined as the stimulus (i.e., examination versus nonexamination groups), reactions to the skin test were not significantly different. However, when stress was defined as the response (i.e., high stress versus low stress scores), the high-stress individuals were found to have poorer reactions to the skin test than the low-stress subjects. The results of the study highlight the need for greater precision in the definition of the term stress and, also, suggest that Multitest CMI can provide a rapid and reproducible means of assessing stress-related immune dysfunction.

Adult↗
PubMed1993

PD 141955 and CI-972: 9-deazaguanine analog purine nucleoside phosphorylase inhibitors. II. Effects on nucleoside catabolism in human and rat blood in vitro.

Patients with deficiency in purine nucleoside phosphorylase (PNP) have elevated levels of the PNP substrates inosine, guanosine, and (rarely) 2'-deoxyguanosine (GdR) in their plasma and urine. GdR is critical because it serves as a precursor of dGTP, which blocks T-cell replication, thus leading to T-cell-selective immune dysfunction. We adapted these findings to the study of PNP inhibitors in human and rat blood in vitro. Blood was spiked with GdR (2.5 micrograms/ml) and the effects of PD 141955 (9-deaza-9-(3-thienylmethyl)guanine; 2-amino-3,5-dihydro-7-(3-thienylmethyl)-4H-pyrrolo[3,2-d]pyrimidin -4-one) and CI-972 (8-amino-9-deaza-9-(3-thienylmethyl)guanine; 2,6-diamino-3,5-dihydro-7-(3-thienylmethyl)-4H-pyrrolo[3,2-d]pyrim idin-4- one) on GdR catabolism were determined. GdR was metabolized 89 times faster in human blood than in rat blood (half-life = 12.0 +/- 1.4 s in human blood). When PD 141955 (1 microgram/ml) was added to human blood before spiking, the GdR half-life increased to > 60 min. In contrast, CI-972 (1 microgram/ml) extended the GdR half-life to 7.2 +/- 1.7 min. Both PD 141955 and CI-972 at 1 microgram/ml significantly retarded GdR catabolism from rat blood.

Animals↗
PubMed1989

Susceptibility to a mouse acquired immunodeficiency syndrome is influenced by the H-2.

The development of a mouse acquired immunodeficiency syndrome (MAIDS) induced following LP-BM5 MuLV infection depends on host genetic factors. Susceptible mice, such as C57BL/6J mice, develop a profound impairment of lymphoproliferative response to mitogens and hyperplasia of lymphoid organs and succumb to infection within 6 months. These changes do not occur in resistant mice, such as A/J mice. Resistance to MAIDS is a dominant trait since (C57BL/6J x A/J)F1 hybrid mice did not develop any immune dysfunctions following infection. Genetic regulation of the trait of resistance/susceptibility to MAIDS was determined in AXB/BXA recombinant inbred (RI) mouse strains (derived from resistant A/J and susceptible C57BL/6J progenitors). Two different criteria were used to determine their resistance or susceptibility to developing MAIDS: the gross pathologic evaluation of lymphoid organs at 13-15 weeks of infection, and survival. RI mouse strains segregated into two non-overlapping groups. The first group did not develop any significant pathology, and these mouse strains were considered as resistant to MAIDS. The second group showed the virus-induced pathological changes as well as an immunological dysfunction as seen in C57BL/6J progenitor mice, and these strains were thus considered as susceptible to MAIDS. This bimodal strain distribution pattern of resistance/susceptibility to MAIDS among the RI strains suggests that this phenotype is controlled by a single gene. Linkage analysis with other allelic markers showed a strong association between resistance/susceptibility to MAIDS and the H-2 complex. Possession of the H-2b haplotype derived from C57BL/6J mice was associated with susceptibility to MAIDS, while the H-2a haplotype conferred resistance to the disease. This finding was confirmed by demonstrating that H-2a congenics on the susceptible C57BL/10 background were as resistant to MAIDS as A/J mice which donated the H-2a locus. Gene(s) within the H-2 complex thus represent the major regulatory mechanism of resistance/susceptibility to MAIDS.

Acquired Immunodeficiency Syndrome↗
PubMed2003

Sinus histiocytosis with massive lymphadenopathy: complicated by autoimmune hemolytic anemia.

Sinus histiocytosis with massive lymphadenopathy is a rare histiocytic disorder with very few case reports in Indian literature. Immunological abnormalities have been documented in few cases. We report one such case of a child presenting with generalized lymphadenopathy and complicated by autoimmune hemolytic anemia, suggestive of an associated immune dysfunction.

Anemia, Hemolytic↗
PubMed1998

Expression and regulation of mRNA for distinct isoforms of cAMP-specific PDE-4 in mitogen-stimulated and leukemic human lymphocytes.

We reported previously that the gene for PDE-1B1 is induced in isolated human peripheral blood lymphocytes (HPBL) following mitogenic stimulation (Jiang, X., Li, J., Paskind, M., and Epstein, P.M. [1996] Proc. Natl. Acad. Sci. USA 93, 11,236-11,241). Using reverse transcription-polymerase chain reaction (RT-PCR), we investigated possible changes in the expression of the four genes for cAMP-specific phosphodiesterase (PDE-4A-D) in HPBL under the same conditions. Isolated, quiescent HPBL express mRNA for PDE-4B as the principal transcript. Following mitogenic stimulation with phytohemagglutinin (PHA), mRNA for PDE-4A and PDE-4D are clearly induced. HPBL appear not to express PDE-4C under resting or stimulated conditions. The PHA induced increase in PDE-1B1, PDE-4A, and PDE-4D mRNA is mimicked by incubation of HPBL with dibutyryl cAMP (dBcAMP) and 1-methyl-3-isobutylxanthine (IBMX). The B-lymphoblastoid cell line, RPMI 8392, and the T-leukemic cell line, Molt 4, express PDE-4A mRNA as the most abundant transcript, but incubation with dBcAMP and IBMX induces an increase in the expression of mRNA for PDE-4B in both of these cell lines, and in PDE-4D3 in the RPMI 8392 cell line. These studies demonstrate that expression of mRNA for PDE-1B1 and some of the subtypes of PDE-4 are induced in HPBL following mitogenic stimulation, possibly secondarily to elevation of cAMP induced by the mitogen. As already indicated for PDE-1B1, some of these subtypes of PDE-4 might also provide additional therapeutic targets for treatment of immunoproliferative disorders and immune dysfunction.

1-Methyl-3-isobutylxanthine↗
PubMed1993

Vitamin E supplementation modulates cytokine production by thymocytes during murine AIDS.

Female C57BL/6 mice were infected with LP-BM5 retrovirus, causing murine AIDS, which is functionally similar to human AIDS. Retrovirus infection targeted the thymus, producing altered T cell differentiation via the dysregulation of thymocyte cytokine production. Human AIDS causes vitamin deficiencies, therefore the effects of dietary vitamin E supplementation were determined on the kinetics of cytokine production by concanavalin A-stimulated thymocytes in uninfected normal mice and mice with murine AIDS. Dietary supplementation, with a 15-fold increase in vitamin E (160 IU/l) in the liquid diet (National Research Council), modulated interleukin-2 (IL) production in both uninfected mice and retrovirus-infected mice. Vitamin E significantly reduced the level of IL-4 secretion in the uninfected mice at 4 and 8 weeks, but not at 12 and 16 weeks. It also significantly reduced IL-4 production, elevated by retrovirus infection. Vitamin E significantly reduced IL-6, and interferon-gamma production increased in murine AIDS. The effects of dietary vitamin E on concanavalin A-induced proliferation of thymocytes were consistent with the finding of changes in IL-2 secretion. No effects of dietary vitamin E on thymus weight were observed in uninfected or retrovirus-infected mice, whereas vitamin E significantly increased serum and thymic vitamin E concentration, which had been reduced by retrovirus infection. These data indicate that dietary vitamin E supplementation can modulate cytokine production by thymocytes, affecting T cell differentiation, especially during retrovirus-induced immune dysfunction.

Animals↗
PubMed2001

Risk factors for cytomegalovirus retinitis following bone marrow transplantation from unrelated donors in patients with severe aplastic anemia or myelodysplasia.

Two cases of cytomegalovirus (CMV) retinitis following bone marrow transplantation (BMT) from unrelated donors are reported. 1 patient had been treated for severe aplastic anemia (SAA) and the other for hypoplastic myelodysplastic syndrome (MDS). Because first line therapy with antithymocyte globulin (ATG) and cyclosporin A (CsA) had failed, BMT was performed following a conditioning regimen of ATG, cyclophosphamide, and total lymphoid irradiation. Treatment for CMV retinitis was successfully carried out with gancyclovir (systemic and intraocular injection), foscarnet, and photocoagulation (Case 1) and gancyclovir and foscarnet (Case 2). Both patients also developed Epstein-Barr virus-associated lymphoproliferative disease (EBV-LPD). We compared these 2 cases with 14 SAA patients who did not develop CMV retinitis after BMT using marrow from either HLA-identical siblings (n = 9) or from unrelated donors (n = 5). Unlike the retinitis patients, the latter 5 patients received ATG only once. The retinitis patients had significantly lower CD4+ T-cell levels in their peripheral blood than the 14 patients who did not develop CMV retinitis. We believe that repeated treatment with ATG and transplantation from unrelated donors may lead to immune dysfunction that could increase the likelihood of CMV retinitis, as well as LPD. For such BMT patients, regular ophthalmic examinations and careful testing for CMV antigenemia are recommended.

Adolescent↗
PubMed1989

Preliminary results on clinical and immunological effects of thymus hormone preparations in AIDS.

The human immunodeficiency virus (HIV) is the newly recognized agent of the acquired immunodeficiency syndrome (AIDS). Global defects of the immune functions, including T- and B-cell immunity, macrophage functions and cytokine production, are commonly observed among patients with HIV infection. Many studies have shown thymus involvement and endocrine function impairments among these patients. Clinical trials with thymic compounds aiming at restoring the immune dysfunctions will be reviewed.

Acquired Immunodeficiency Syndrome↗
PubMed2004

Serum levels of insulin-like growth factor-I (IGF-I) and dehydroepiandrosterone sulfate (DHEA-S), and their relationships with serum interleukin-6, in the geriatric syndrome of frailty.

BACKGROUND AND AIMS: The geriatric syndrome of frailty has been conceptualized as a loss of physiologic reserve associated with endocrine dysregulation and immune dysfunction. Our prior studies suggest that the frailty syndrome is associated with elevated serum IL-6 levels. In the present study, our aim is to evaluate the possible role of endocrine dysregulation and its relationship with serum IL-6 in the pathogenesis of this syndrome. METHODS: Using a recently validated screening algorithm for frailty, we identified 18 frail and 33 non-frail community-dwelling older adults for inclusion in this study. Serum levels of insulin-like growth factor-I (IGF-I), DHEA-S, and IL-6 were measured by immunoassays. The inter-relationships among serum levels of IL-6, DHEA-S, and IGF-I were determined by linear regression analysis. RESULTS: Age-adjusted serum levels of IGF-I (88+/-49 vs 122+/-47 [ng/mL], p<0.023) and DHEA-S (0.30+/-0.21 vs 0.53+/-0.25 [microg/mL], p=0.016) were significantly lower in frail vs non-frail individuals, respectively. There was a trend for IL-6 to be inversely correlated with IGF-I in the frail (r=-0.42; p=0.082) but not the non-frail group (r=0.12, p=0.521). CONCLUSIONS: Frail subjects have lower levels of serum IGF-I and DHEA-S and higher levels of IL-6 than do non-frail, age-matched individuals. The trend toward an inverse correlation between IGF-I and IL-6 in the frail, but not the non-frail group, suggests potential interaction between endocrine and immune/cytokine dysregulation that requires further study in larger cohorts.

Aged↗
PubMed2004

GM-CSF counteracts hemorrhage-induced suppression of cytokine-producing capacity.

OBJECTIVE AND DESIGN: To study whether a treatment with the hematopoietic growth factor GM-CSF restores the attenuated ex-vivo cytokine-producing capacity of macrophages after sublethal hemorrhagic shock. SUBJECTS: Male Sprague-Dawley rats. TREATMENT: 20 microg/animal of recombinant murine GM-CSF after shock via arterial line. METHODS: Hemorrhagic shock was established by pressure-controlled bleeding to a mean arterial pressure of 50 mm Hg for 35-40 min and consecutive resuscitation. 24 h after hemorrhage, lipopolysaccharide (LPS)-induced cytokine production of isolated macrophages derived from different compartments was measured. RESULTS: A significant reduction of LPS-induced TNFalpha production was found in whole blood cultures (1.0 +/- 0.7 ng/ml after sham vs. 0.23 +/- 0.08 ng/ml after shock operation), macrophages derived from spleen (0.88 +/- 0.23 ng/ml after sham vs. 0.03 +/- 0.1 ng/ml after shock operation), peritoneum (2.2 +/- 0.7 ng/ml after sham vs. 0.29 +/- 0.4 ng/ml after shock operation) and bronchoalveolar fluid (0.65 +/- 0.13 ng/ml after sham vs. 0.003 +/- 0.027 ng/ml after shock operation, mean +/- S.D.). In cells from animals treated with GM-CSF a significantly enhanced LPS-induced TNFalpha production in splenic, alveolar and peritoneal macrophages was found after shock compared to the cells derived from untreated animals (peritoneum: 289 +/- 366 ng/ml TNFalpha after shock vs. 2066 +/- 94 ng/ml TNFalpha after shock and GM-CSF; lung: 9 +/- 12 ng/ml TNFalpha after shock vs. 64 +/- 17 ng/ml TNFalpha after shock and GM-CSF; spleen: 58 +/- 96 ng/ml TNFalpha after shock vs. 548 +/- 47 ng/ml TNFalpha after shock and GM-CSF). Blood cultures collected from rats after hemorrhagic shock did not show a significant increase of TNFalpha-production after GM-CSF treatment. CONCLUSION: Hemorrhagic shock caused a depression of the TNFalphaa response to LPS which was partly counteracted by treatment with GM-CSF. Therefore, GM-CSF represents a promising approach to normalise trauma- and shock-induced immune dysfunction.

Animals↗
PubMed2002

Genetic control of autoimmunity in Type I diabetes and associated disorders.

Type I (insulin-dependent) diabetes mellitus is a heterogeneous disease with major subdivisions termed Type 1A (immune-mediated) and Type 1B. Immune-mediated diabetes is also heterogeneous with "monogenic", oligogenic, and polygenic forms present in humans and in animal models. Single-gene mutations of two transcription factors have been recently identified in rare syndromes of autoimmunity with type 1A diabetes: autoimmune polyendocrine syndrome type 1 (APS-1) and X-linked polyendocrinopathy, immune dysfunction and diarrhoea (XPID). For more common forms of diabetes, susceptibility loci within the major histocompatibility complex and at the insulin locus have been identified. Both DQ(*) and DR* alleles provide susceptibility and certain alleles dominant protection. In the Diabetes Autoimmunity Study of the Young approximately 50 % of the siblings studied with the highest-risk HLA genotype develop anti-islet autoantibodies by age 3. Insulin could be a crucial autoantigen related to genetic susceptibility. The crystal structure of the high-risk allele, HLA-DQ8, complexed with an insulin peptide has just been reported. Insulin production by macrophage-dendritic cells within the thymus and lymphoid organs could underlie insulin gene polymorphisms influencing the risk of diabetes. Genome-wide scans for linkage in animal models and in humans have not conclusively identified other susceptibility genes though many loci have been implicated. We favour the hypothesis that HLA is a major determinant of susceptibility in animal models and in most families, and that the search for diabetogenes should concentrate on unique families to decrease heterogeneity and favour the eventual discovery of genes influencing risk.

Animals↗
PubMed2001

Low rate of proliferation in immature thymocytes of the non-obese diabetic mouse maps to the Idd6 diabetes susceptibility region.

AIMS/HYPOTHESIS: The non-obese diabetic (NOD) mouse spontaneously develops T-cell-dependent autoimmune diabetes. This mouse strain has a number of immune dysfunctions related to T-cell development but so far there are no available data on the proliferation of NOD immature thymocytes. We therefore studied the thymocyte proliferation in the NOD mouse in discrete stages of T-cell development. METHODS: We depleted thymocytes in vivo and analysed thymocyte proliferation during the thymus recovery from depletion. We used co-segregation analysis and quantitative loci trait analysis to investigate the genetic control of proliferation impairments in NOD thymocytes. RESULTS: Immature thymocytes of female NOD mice proliferate with a relatively low rate compared to non-autoimmune C57Bl/6 mice. This aberrant proliferation was most pronounced in CD4-/lo CD8+ cells differentiating from the CD4-CD8- to the CD4+CD8+ stage. A genetic mapping study using an F2 intercross between the NOD and the C57BL/6 strains showed that a major locus controlling this trait is linked to the insulin-dependent diabetes susceptibility locus Idd6. CONCLUSION/INTERPRETATION: Our results suggest that impairment of proliferation of immature thymocytes is one possible mechanism through which the Idd6 locus contributes to the pathogenesis of diabetes.

Animals↗
PubMed2006

Single-nucleotide polymorphisms in porcine mannan-binding lectin A.

The MBL1 and MBL2 genes encode mannan-binding lectins (MBL) A and C, respectively, that are collagenous lectins (collectins) produced mainly by the liver. Several single-nucleotide polymorphisms (SNPs) in the human MBL2 gene are responsible for various innate immune dysfunctions due to abnormal structure or expression of human MBL-C. The MBL1 gene encodes MBL-A, which has bacteria-binding properties in pigs and rodents but is mutated to a pseudogene in humans and chimpanzees. In these studies, we surveyed both porcine MBL genes for SNPs that might impair disease resistance. Single-strand conformational polymorphism (SSCP) analysis of MBL cDNAs from porcine liver revealed three SNPs within the coding region of MBL1 in various breeds of pigs. One nonsynonymous SNP that substituted cysteine for glycine in the collagen-like domain of pig MBL-A was found by a multiplex PCR test in all European pig breeds examined, with allele frequencies ranging from 1.4 to 46.4%. No SNPs were identified in the coding region of porcine MBL2 but the expression of MBL-C in the liver was widely variable in comparison to the expression of MBL-A, GAPDH, PigMAP, and haptoglobin. These results indicate that some pigs have a miscoding defect in MBL-A and a possible expression defect in MBL-C, which are analogous to coding and promoter polymorphisms that affect human MBL-C.

Amino Acid Sequence↗
PubMed2001

A rare polyadenylation signal mutation of the FOXP3 gene (AAUAAA-->AAUGAA) leads to the IPEX syndrome.

The mouse scurfy gene, Foxp3, and its human orthologue, FOXP3, which maps to Xp11.23-Xq13.3, were recently identified by positional cloning. Point mutations and microdeletions of the FOXP3 gene were found in the affected members of eight of nine families with IPEX (immune dysfunction, polyendocrinopathy, enteropathy, X-linked; OMIM 304930). We evaluated a pedigree with clinically typical IPEX in which mutations of the coding exons of FOXP3 were not detected. Our reevaluation of this pedigree identified an A-->G transition within the first polyadenylation signal (AAUAAA-->AAUGAA) after the stop codon. The next polyadenylation signal is not encountered for a further 5.1 kb. This transition was not detected in over 212 normal individuals (approximately 318 X chromosomes), excluding the possibility of a rare polymorphism. We suggest that this mutation is causal of IPEX in this family by a mechanism of nonspecific degradation of the FOXP3 gene message.

Cells, Cultured↗
PubMed2026

Metabolic convergence of diabetes and prostate cancer: from dysglycemia to tumor microenvironment reprogramming.

The relationship between diabetes mellitus and prostate cancer (PC) represents one of the most intriguing paradoxes in cancer epidemiology, with diabetic individuals exhibiting a reduced incidence of PC yet poorer prognosis following diagnosis. This apparent contradiction underscores the need for an integrated understanding of how systemic metabolic dysfunction influences prostate carcinogenesis and disease progression. The present review critically synthesizes contemporary epidemiological, mechanistic, and translational evidence to establish metabolic convergence as a unifying framework linking diabetes-associated metabolic abnormalities with PC biology. Current evidence indicates that chronic dysglycemia, hyperinsulinemia, insulin resistance, and endocrine perturbations orchestrate interconnected intracellular signaling networks involving PI3K-AKT-mTOR, AMPK, AGE-RAGE signaling, oxidative stress, mitochondrial dysfunction, and epigenetic reprogramming, collectively driving metabolic adaptation and tumor evolution. Beyond tumor-intrinsic mechanisms, diabetes profoundly remodels the prostate tumor microenvironment through alterations in stromal metabolism, cancer-associated fibroblast activation, adipocyte-tumor crosstalk, extracellular matrix (ECM) remodeling, hypoxic adaptation, and vascular dysfunction, while simultaneously promoting immunometabolic reprogramming characterized by macrophage polarization, T-cell dysfunction, immune checkpoint activation, and immune evasion. The review further examines the bidirectional interactions between antidiabetic therapies and PC treatment, critically evaluating the translational potential of metformin and emerging glucose-lowering agents within the context of precision metabolic therapeutics. Finally, future directions encompassing biomarker-guided patient stratification, longitudinal metabolic profiling, multi-omics integration, artificial intelligence, and clinically relevant mechanistic validation are discussed as essential components of next-generation precision oncology. Collectively, this review reframes diabetes as an active metabolic determinant of PC rather than a coincidental comorbidity and highlights metabolism-centered precision strategies as promising avenues for improving risk stratification, therapeutic decision-making, and clinical outcomes in diabetes-associated PC.

Humans↗
PubMed1999

Chemically defined structured lipids: current status and future directions in gastrointestinal diseases.

Over the past two decades various concepts for the supply of lipids in parenteral and enteral nutrition have been developed. Traditionally, the nutritional dietary management typically includes physical mixtures of medium chain and long-chain triglycerides. Recently, chemically defined structured lipids have been developed that combine the advantages of conventional fats with those of special purposes. The first structured lipids were produced by mixing pure medium-chain triglycerides and long-chain triglycerides, allowing hydrolysis to free fatty acids, followed by random transesterification of the fatty acids into mixed triglyceride molecules. This results in a triglyceride containing combinations of short-, medium-, and long-chain fatty acids on a single glycerol backbone. These have unique chemical, physical, and/or physiological properties which differ from simply blending mixtures from the starting fats. By use of 1,3-specific or 2-specific lipases it is now possible to synthesize 1,3-specific or 2-specific triglycerides containing short- and/or medium-chain acids. For instance, incorporation of linoleic, arachidonic, or eicosapentaenoic acid at the sn-2 position is being evaluated for the specific objective of modulating membrane fatty acid composition and essential fatty acid absorption in models of cancer, burns, and immune dysfunction. This contribution reviews the current status of experimental and clinical studies of chemically defined structured lipid-based fat emulsions, with emphasis on their therapeutic potential for nutritional support in hospitalized patients.

Animals↗
PubMed2004

COX-2 inhibition as a treatment approach in schizophrenia: immunological considerations and clinical effects of celecoxib add-on therapy.

Recent advances in immunological research regarding the differentiation between the type-1 and type-2 immune response are discussed. Increased levels of Interleukin-6 (IL-6) and the activation of the IL-6 system in schizophrenia might be the result of the activation of type-2 monocytes/macrophages, too. On the contrary, several parameters of the specific cellular immune system are blunted, e. g. the decreased type-1 related immune parameters in schizophrenic patients. This study was performed as a double-blind, placebo-controlled, randomized evaluation of risperidone and celecoxib versus risperidone and placebo. Fifty schizophrenic patients were included in the study: 25 patients received risperidone and placebo, and 25 patients received risperidone and celecoxib for 5 weeks after the wash-out period. The treatment effect was calculated by ANCOVA. In parallel, serum levels of sTNF-R1 and sIL- 2R, and the percentages of CD3(+)-, CD4(+)-, and CD19(+) lymphocytes were estimated. As expected, both groups of schizophrenic patients showed significant improvement. However, the celecoxib add-on therapy group showed a significant group effect in the PANSS total score. The cytokines and lymphocytes reflected the type-1/type-2 balancing effects of COX-2 inhibitors. Additional treatment with celecoxib has significant positive effects on the therapeutic action of risperidone with regard to the total schizophrenia psychopathology. Moreover, the fact that treatment with an immunomodulatory drug shows beneficial effects on the symptomatology of schizophrenia indicates that immune dysfunction in schizophrenia is not just an epiphenomenon, but related to the pathomechanism of the disorder.

Analysis of Variance↗