Intercorrelations of lipoprotein subfractions and their covariation with lifestyle factors in healthy men

So far, little is known about the effect of nutrition and lifestyle on the composition of circulating lipoprotein subfractions. In the current study, we measured the correlations among physical activity, nutrient intake, smoking, body-mass index (BMI), and age with the concentration of triglycerides, cholesterol, phospholipids, and apolipoproteins (ApoA1, ApoA2 and ApoB) in subfractions of LDL and HDL in 265 healthy working men. Concentrations of cholesterol, phospholipids, and ApoB in small, dense atherogenic LDL particles (sdLDL) correlated negatively (p<0.001) with those of cholesterol, phospholipids, and ApoA1 in HDL2, respectively. Age correlated positively with sdLDL while increasing BMI correlated with an atherogenic shift of cholesterol, phospholipids, and ApoB from large, buoyant LDL (lbLDL) to sdLDL and decreasing concentrations of HDL2 constituents. Physical activity and alcohol intake correlated negatively with sdLDL constituents and positively with HDL2 components. Consumption of monounsaturated fatty acids (MUFA) correlated with a lower ratio of sdLDL to HDL2 cholesterol. A favorable lipoprotein subfraction profile linked to a reduced risk of cardiovascular disease in men was associated with physical activity, moderate alcohol consumption, and dietary intake of MUFA, which might be exploited in future interventions for prevention of age- and BMI-associated atherogenic shifts of lipoprotein subfractions.     

Mycobacterium tuberculosis infection among HIV/AIDS patients in Thailand: clinical manifestations and outcomes

A one year retrospective study, was conducted at Bamrasnaradura Hospital, Nonthaburi Province, Bangkok, Thailand, of 271 subjects with both TB and HIV/AIDS. Single males (median age group 31 to 40 years) were most likely to develop co-infection. The commonest clinical manifestations on initial presentation included a low grade fever, cough, weight loss, lymphadenopathy with pancytopenia, and lung infiltrates. Multi-drug resistant TB (MDR-TB) was found in 26.6% of the subjects which was significantly associated with a past history of anti-TB treatment (p = 0.005; OR=2.5); it was also significantly associated with disseminated TB (p = 0.022; OR=1.9) and mortality (p= 0.013; OR=2.8). Analysis of clinical outcomes showed that 46.7% were lost to follow-up and 13.3% had died by the time of follow-up. Among those who survived, only 11.4% had been successfully treated; the rest had not improved due to relapse (2.9%), therapeutic failure (8.8%), treatment in progress (5.9%), and failure to complete treatment (10.7%).     

Increasing hematocrit reduces early posttransplant cardiovascular risk in diabetic transplant recipients

BACKGROUND: Cardiovascular disease remains epidemic in transplant recipients, despite aggressive treatment of cardiovascular risk factors. Thus, novel risk factors could play a role in the genesis of cardiovascular events in this population. METHODS: We evaluated the impact of early posttransplant anemia on cardiovascular events. We examined rolling average hematocrit values at 30-day intervals and determined the effect of increasing hematocrit on the risk for cardiovascular (CV) events in a single-center population of 404 type 1 diabetic end-stage renal disease patients who underwent either cadaveric kidney transplantation alone or simultaneous pancreas-kidney transplantation. RESULTS: Greater than 60% of the individuals in the study cohort had hematocrit less than or equal to 30% at least once during the first 30 days posttransplant. Forty-two individuals (10.4% of the study population) had at least one 30-day rolling hematocrit less than or equal to 30% and a CV event (myocardial infarction, CV death, angina, congestive heart failure) during the first 26 weeks of the posttransplant course. Increasing hematocrit (>30%) led to a reduction in the risk ratio (RR) for a CV event compared with hematocrit less than or equal to 30% (RR, 0.237; P=0.015). The association between anemia and CV events remained statistically significant in a multivariate analysis (RR, 0.65; P=0.022) that also included age and a history of pretransplant ischemic heart disease. CONCLUSIONS: These data suggest that anemia is an important risk factor for early posttransplant CV events in a high-risk population. Prospective studies of anemia management therapy in this setting are warranted to determine whether this will reduce early posttransplant CV risk.     

Survival of Pseudomonas pseudomallei in human phagocytes

Pseudomonas pseudomallei causes the disease melioidosis, with protean manifestations, protracted clinical course and unpredictable response to antimicrobial treatment. Intracellular location of the organism is suspected to be the cause of these properties. This study was undertaken to examine the intracellular growth of this bacterium. Intracellular growth and survival was assessed at different time intervals, by Gram's stain and electronmicroscopic examination. During the first 5 h, the numbers of P. pseudomallei within phagocytes did not change significantly. By 18-21 h, gram-stained preparations revealed that P. pseudomallei cells completely filled the phagocytes and electronmicroscopy showed evidence of binary fission. During that time the number of cfu of P. pseudomallei growing simultaneously in vitro increased by log10 2-3. The phagocytes remained viable throughout the observation period and retained their capacity to produce an oxidative burst for the first hour of incubation. The ability of P. pseudomallei to survive and multiply in phagocytes shows that it is a facultative intracellular bacterium. This finding is relevant to the selection of antimicrobial regimens, and the management of the disease.     

A new mucin antibody/enzyme-linked lectin-sandwich assay of serum MUC5AC mucin for the diagnosis of cholangiocarcinoma

We have previously used agarose gel electrophoresis and immunoblotting to qualitatively measure serum MUC5AC mucin for diagnosing cholangiocarcinoma. In this study, we developed a quantitative determination of serum MUC5AC by sandwich ELISA using MUC5AC mucin monoclonal antibody and soybean agglutinin. A cut-off value of the absorbance 0.074 was obtained from a complete statistical Receiver Operating Characteristic curves with an area under the curve=0.8141. The assay could discriminate cholangiocarcinoma patients from the controls with 71% sensitivity and 90% specificity. The test is simple to perform, reproducible, and probably used for detecting cholangiocarcinoma in a high-risk group or suspected patients.     

In Vitro Activity and Beta-Lactamase Stability of BL-S786 Compared with Those of Other Cephalosporins

In vitro activity of BL-S786, a new parenterally semisynthetic cephalosporin, was investigated against 570 bacterial isolates. BL-S786 inhibited most Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, and Salmonella. It inhibited some Enterobacter and indole-positive Proteus, but it was less active against these later species than was cefamandole, cefuroxime, or cefoxitin. It was not active against Serratia marcescens, Pseudomonas aeruginosa, or Bacteroides fragilis. BL-S786 was the least active new cephalosporin tested against staphylococci and was less active than cephalothin against streptococcal species. The activity of BL-S786 was not altered by the type of assay medium nor by 50% serum. The size of the test inoculum altered the minimal inhibitory and bactericidal concentrations for inhibition of some organisms, particularly those with Richmond type I β-lactamases. BL-S786 was not hydrolyzed by the R-factor-mediated, Richmond type III β-lactamase, but it was hydrolyzed by type I β-lactamases.     

HR 756, a New Cephalosporin Active Against Gram-Positive and Gram-Negative Aerobic and Anaerobic Bacteria

The in vitro activity of HR 756, 7-[2-(2-amino-4-thiazolyl)-2-(Z)-(methoximino)acetamido] cephalosporanic acid, was investigated against 659 isolates. HR 756 inhibited Neisseria and Haemophilus species at concentrations similar to those needed with ampicillin. It inhibited beta-lactamase-producing N. gonorrhoeae and H. influenzae. HR 756 was the most active compound tested against members of the Enterobacteriaceae, inhibiting most isolates of Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, Salmonella, Enterobacter, and Shigella at concentrations of less than 0.1 mug/ml. It was twice as active as carbenicillin against Pseudomonas aeruginosa and inhibited Bacteroides fragilis as well as cefoxitin. HR 756 killed E. coli, Staphylococcus aureus, and P. aeruginosa at rates similar to other beta-lactam antibiotics.     

Combined antioxidant (beta-carotene, alpha-tocopherol and ascorbic acid) supplementation increases the levels of lung retinoic acid and inhibits the activation of mitogen-activated protein kinase in the ferret lung cancer model

Interactions among beta-carotene (BC), alpha-tocopherol (AT) and ascorbic acid (AA) led to the hypothesis that using a combination of these antioxidants could be more beneficial than using a single antioxidant alone, particularly against smoke-related lung cancer. In this investigation, we have conducted an animal study to determine whether combined BC, AT and AA supplementation (AOX) protects against 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK)-induced lung carcinogenesis in smoke-exposed (SM) ferrets. Ferrets were treated for 6 months in the following four groups: (i) control, (ii) SM + NNK, (iii) AOX and (iv) SM + NNK + AOX. Results showed that the combined AOX supplementation (i) prevented the SM + NNK-decreased lung concentrations of retinoic acid (RA) and BC; (ii) inhibited the SM + NNK-induced phosphorylation of Jun N-terminal kinase (JNK), extracellular-signal-regulated protein kinase (ERK) and proliferating cellular nuclear antigen proteins in the lungs of ferrets; and (iii) blocked the SM + NNK-induced up-regulation of total p53 and Bax proteins, as well as phosphorylated p53 in the lungs of ferrets. In addition, there were no lesions observed in the lung tissue of ferrets in the control and/or the AOX groups after 6 months of intervention, but combined AOX supplementation resulted in a trend toward lower incidence of both preneoplastic lung lesions and lung tumor formation in SM + NNK + AOX group of ferrets, as compared with the SM + NNK group alone. These data indicate that combined AOX supplementation could be a useful chemopreventive strategy against lung carcinogenesis through maintaining normal tissue levels of RA and inhibiting the activation of mitogen-activated protein kinase pathways, cell proliferation and phosphorylation of p53.     

Carcinoid tumors in the breast

BACKGROUND: Carcinoid tumors in the breast are rare. Most represent metastases from other primary sites, but commonly are mistaken for primary breast lesions. METHODS: A literature search of the English language found 59 cases of carcinoid tumors in the breast, 21 (36%) of which were metastases. RESULTS: We present an additional 3 cases of carcinoid tumors metastatic to the breast and discuss the clinical, radiologic, and pathologic manifestations. CONCLUSIONS: It is important to differentiate between primary breast carcinoid tumor and metastatic disease to the breast because of differences in treatment. All palpable breast masses and mammographically detected lesions should undergo a biopsy examination. In those patients with a known history of carcinoid tumor, pertinent clinical history, and previous surgical specimens should be reviewed to avoid an unnecessary mastectomy. If there is no history of a prior carcinoid tumor, a thorough work-up to look for an occult primary tumor elsewhere should be performed.