Cold agglutinins(CA),autoantibodies against the antigen I or i on the surface of red blood cells,are mainly of IgM class,and the majority have κ light chains.They can lead to red blood cell agglutination at decreased body temperature and are usually associated with infections,drug reactions,autoimmune diseases,and hematological malignancies.However,solid tumors with CA are rare.We reported two cases of CA in the peripheral blood of patients with solid tumors.Peripheral complete blood cell count of the patients at admission showed reduced erythrocyte count and hematocrit,mismatching between erythrocyte count and hemoglobin,abnormally elevated levels of mean corpuscular hemoglobin and mean cell hemoglobin concentration.Peripheral blood smear showed erythrocyte aggregation.After the sample was preheated at 37 ℃ for 30 min,the reversibility of red blood cell aggregation was observed,and the erythrocyte parameters were corrected.
Humans ; Autoantibodies/isolation & purification* ; Female ; Breast Neoplasms/immunology* ; Ovarian Neoplasms/immunology*

BACKGROUNDRecent studies have indicated that an imbalance of gut microbiota is associated with the development of type 1 diabetes mellitus (T1DM) and there is no literature regarding it in Chinese children yet. The aim of this study was to evaluate the alteration of gut microbiota between children with newly diagnosed T1DM and healthy controls and to determine if gut microbiota could partly explain the etiology of this disease.

METHODSA case-control study was carried out with 15 children with T1DM and 15 healthy children. The fecal bacteria composition was investigated by high-throughput sequencing of the V3-V4 region of the 16S rDNA gene and analyzed by the estimators of community richness (Chao) indexes.

RESULTSThere was a notable lower richness of fecal bacteria in T1DM group than controls (156.53 ± 36.96 vs. 130.0 ± 32.85, P = 0.047). At the genus level, the composition of Blautia was increased in T1DM group than control group whereas the composition of Haemophilus, Lachnospira, Dialister, and Acidaminococcus was decreased. In addition, we found that the percentage of Blautia was correlated positively with HbA1c (ρ = 0.40, P = 0.031), the numbers of T1DM autoantibodies (ρ = 0.42, P = 0.023), and the titers of tyrosine phosphatase autoantibodies (IA-2) (ρ = 0.82, P = 0.000) in the study.

CONCLUSIONSThis study showed that gut microbiota was associated with the development of T1DM by affecting the autoimmunity, and the results suggested a potential therapy for T1DM via modulating the gut microbiota.

Adolescent ; Autoantibodies ; immunology ; Case-Control Studies ; Child ; Computational Biology ; Diabetes Mellitus, Type 1 ; immunology ; microbiology ; Feces ; microbiology ; Female ; Gastrointestinal Microbiome ; genetics ; physiology ; Haemophilus ; genetics ; isolation & purification ; Humans ; Male ; Polymerase Chain Reaction ; RNA, Ribosomal, 16S ; genetics

OBJECTIVETo identify the candidate auto-antigen of rheumatic heart disease as a molecular marker for this disease.

METHODSThe total RNA of the heart tissue of patients with rheumatic heart disease was extracted and reverse-transcribed into long cDNA to construct the phage expression library. The library was screened using the serum from patients with active rheumatic fever, and the positive clone was identified and analyzed by bioinformatics and expressed in vitro. The expressed products were evaluated with Western blotting and its cross-reactivity was assessed.

RESULTSThe phage expression library of the heart tissue of patients with rheumatic heart disease was constructed, with the titer of the primary library of 3.3×10(6) pfu/ml, recombinant rate of 99%, and 81% of the inserted segments were larger than 1 kb. An auto-antigen RHDAG1 was identified by screening, which was homologous to keratin 18. RHDAG1 was detected in the serum of patients with active rheumatic fever and of those with rheumatic heart disease, but not in the serum of healthy subjects.

CONCLUSIONPhage display library can be an effective strategy to screen the auto-antigens of rheumatic heart disease. The auto-antigen RHDAG1 can be a candidate molecular biomarker of rheumatic heart disease and/or rheumatic fever.

Autoantibodies ; blood ; immunology ; Autoantigens ; immunology ; isolation & purification ; Autoimmune Diseases ; blood ; immunology ; Humans ; Peptide Library ; Rheumatic Heart Disease ; immunology

Matteuccia struthiopteris is a nature plant, which contains a lot of potential active components. In the present study, we investigated the effect of polysaccharides extracted from Matteuccia struthiopteris on lupus-like syndrome induced by Campylobacter jejuni CJ-S131 in BALB/c mice. Mice were randomly divided into normal, model control, SLE model (vehicle treated), Matteuccia struthiopteris polysaccharides treated (30 and 15 mg x kg(-1)) groups and prednisone 5 mg x kg(-1) treated groups. The effect of Matteuccia struthiopteris polysaccharides (Ms) on weight and organ index of BALB/c mice was detected. Autoantibodies and total IgG production were measured by enzyme linked immunosorbent assay. Proteinuria was measured and kidneys were examined by light microscopy. Compared with SLE model group, treatment with Matteuccia struthiopteris polysaccharides 30 and 15 mg x kg(-1) reduced weight loss and Matteuccia struthiopteris polysaccharides 15 mg x kg(-1) reduced spleen swelling (P < 0.05). The increased production of autoantibodies and total immunoglobulin G (IgG) were also significantly inhibited. Matteuccia struthiopteris polysaccharides protected kidney against glomerular injury in BALB/c mice with reduced immunoglobulin deposition and lowered proteinuria (P < 0.01). Matteuccia struthiopteris polysaccharides had a protective effect on lupus-like syndrome induced by CJ-S131 in BALB/c mice.
Animals ; Autoantibodies ; blood ; Campylobacter Infections ; Campylobacter jejuni ; Ferns ; chemistry ; Immunoglobulin G ; blood ; Kidney ; pathology ; Lupus Erythematosus, Systemic ; drug therapy ; immunology ; microbiology ; pathology ; Male ; Mice ; Mice, Inbred BALB C ; Phytotherapy ; Plants, Medicinal ; chemistry ; Polysaccharides ; isolation & purification ; pharmacology ; Proteinuria ; urine ; Random Allocation ; Spleen ; pathology ; Syndrome ; Weight Loss ; drug effects

OBJECTIVETo construct and express anti-human RBC and HIVgp160 fusion protein for rapid detection of antibody to HIV.

METHODSThe gene of the anti human RBC ScFv and HIV antigen were constructed together into expression vector. The fusion protein was expressed in E. coli.

RESULTSThe fusion protein was proved to be able to bind both anti-RBC and HIVgp160. It could cause agglutination of human RBC when HIVgp160 was present.

CONCLUSIONThe fusion protein has the potential in rapid detection of HIV.

Antibodies, Monoclonal ; immunology ; isolation & purification ; Autoantibodies ; immunology ; isolation & purification ; Cloning, Molecular ; Enzyme-Linked Immunosorbent Assay ; Erythrocytes ; immunology ; Gene Expression ; Genetic Vectors ; genetics ; HIV Antibodies ; blood ; immunology ; HIV Envelope Protein gp160 ; genetics ; immunology ; metabolism ; HIV Seropositivity ; blood ; Hemagglutination Tests ; methods ; Humans ; Recombinant Fusion Proteins ; genetics ; immunology ; metabolism