Human megakaryocytes. III. Characterization in myeloproliferative disorders

Abnormal proliferation of the megakaryocytic line was observed in the marrow tissue from patients with myeloproliferative disorders. Megakaryocytes were identified by immunofluorescence using distinct platelet protein markers. Plasma factor VIII antigen (factor VIII:AGN) and platelet glycoproteins IIb and IIIa were detected in normal mature and early megakaryocytes, as well as in a morphologically heterogeneous population of low density marrow cells regarded as atypical megakaryocytes. Atypical megakaryocytes were defined as oval/round 14- 35-micron diameter blast-like mononuclear/multinucleated cells bearing platelet protein markers with distinct morphological features, including cytoplasmic vacuolation, variable nuclear/cytoplasmic ratios, and variable cytoplasmic granulation. Atypical megakaryocytes were observed in most chronic myelogenous leukemia (CML) patients and in two patients with polycythemia vera, representing between 60 and 1,840 cells/10(4) cells (less than 1.050 g Percoll/cu cm). No atypical megakaryocytes were found in (a) 20 normal controls, (b) two patients with essential thrombocythemia, (c) a patient with thrombocytosis secondary to acute bleeding, and (d) in two patients with CML. Atypical megakaryocytes appear to represent a single-cell population, as demonstrated by a series of double immunofluorescence assays using combinations of five different antiplatelet protein sera. There was a statistically significant correlation between the frequency of atypical megakaryocytes and the presence of immature forms of myeloid cells in blood. Analyses of Fc IgG receptors conducted with two different immunofluorescence systems have demonstrated that phenotypic similarities existed between atypical megakaryocytes and myeloproliferative platelet proteins and differentiation markers on megakaryocytes are useful in elucidating the pathophysiologic alterations occurring in the megakaryocytic compartment in patients with myeloproliferative disorders.     

AGGRESOME FORMATION IN NEUROPATHY MODELS BASED ON PERIPHERAL MYELIN PROTEIN 22 MUTATIONS

Peripheral neuropathy is a common and debilitating complication of diabetes. In animal models, neurotrophic factors can prevent progression of the neuropathy, but adverse effects prevent systemic administration in adequate doses to treat human disease. We examined whether gene transfer with replication-defective genomic herpes simplex virus (HSV) vectors modified to express nerve growth factor (NGF) could be used to prevent progression of neuropathy in mice. Diabetes induced by streptozotocin (STZ) resulted in a sensory neuropathy manifest by a decrease in the foot sensory nerve amplitude (FSA; control = 20 +/− 0.1 muV, treated = 14 +/− 0.1 muV). Transduction of dorsal root ganglia in vivo with an HSV-based vector expressing NGF under the control of the human cytomegalovirus immediate early promoter (vector SHN) or the HSV latency active promoter 2 (vector SLN) by footpad inoculation 2 weeks after STZ administration protected against the decrease in FSA (22 +/− 1.4 muV and 21 +/− 1.7 muV, respectively) measured 4 weeks later. Injection of SHN into inguinal adipose tissue 2 weeks after onset of diabetes also prevented the decrease in FSA (20 +/− 3.3 muV). These results suggest that gene transfer with an NGF-producing herpes-based vector may prove useful in the treatment of diabetic neuropathy.     

P12 Halitometry in patients with chronic caseous tonsilitis prior to CO2 laser treatment

Objective  The aim of the study was to determine whether the level of salivary amines in halitosis patients depends on regular contact with pets (dogs and cats) in childhood or at present. It is believed that bacteria metabolizing amine compounds into compounds causing fetor ex ore may be transmitted to humans from animals.
Methods  The study covered 84 patients suffering from halitosis and 40 healthy controls aged 20–62 (avg. 39.7). Each person completed a questionnaire and was then examined for organoleptic score, VSC by halimeter and evaluation of low molecular mass amines by a ninhydrine colourimetric reaction. Halitosis was diagnosed if the average level of VSC measured by the halimeter was >125 ppb and the organoleptic measurement using a 5-point scale was >2. Statistical analysis was performed using Wilcoxon's and Chi square tests.
Results  Analysis showed a statistically significant correlation between halitosis and regular contact with pets at present ( P  < 0.001) or in childhood ( P  < 0.001).
Conclusions  Pets (dogs, cats) owned in childhood or at present may transmit bacteria that cause halitosis.     

辅助放疗能够提高颈淋巴结转移的头颈癌患者的总生存率

虽然对局部晚期头颈鳞癌（HNSCC）患者多建议行辅助放疗（RT），但其对患者总生存率或肿瘤专生存率的影响仍未充分阐明，该文旨在研究辅助RT对可手术切除的颈淋巴结阳性头颈癌患者生存率的影响。     

HIV-1 infection of monocytes is directly related to the success of HAART

Macrophages are recognized cellular compartments involved in HIV infection; however, the extent to which precursor monocytes are infected in vivo and its significance remains poorly understood. Our aim was to analyze the contribution of monocytes to HIV infection in vivo. PCR assays did not detect HIV-1 proviral DNA in monocytes of HAART-suppressed patients. Monocyte-derived macrophages from individuals under suppressive HAART did not show evidence of harboring HIV, thereby, minimizing the possibility of infection by the integration of sequestered virus after differentiation. These results suggest that the infection of permissive monocytes is directly related to the success of HAART (p<0.001). HIV-1 env was characterized from patients under sub-optimal HAART and hence, with infected monocytes. Sequence analyses showed a consistent relationship between monocytes and plasma virus. Altogether, we found that in suppressive HAART, neither monocytes nor Monocyte-derived macrophages-harbored HIV.     

Vascular erosion caused by a double-lumen central venous catheter during therapeutic plasma exchange

BACKGROUND: The use of large-bore double-lumen dialysis catheters has simplified the procedure of therapeutic plasma exchange, but these catheters are associated with unusual and possibly life-threatening complications. CASE REPORT: A 46-year-old black man was admitted to the hospital with acute onset of paresthesia and weakness. A diagnosis of Guillain-Barre syndrome was made. Plasma exchange therapy was instituted by peripheral venous access. After three such exchanges, a double-lumen central venous catheter was placed via the left subclavian vein on hospital Day 7. The patient experienced a sudden onset of severe chest pain and dyspnea during the fourth plasma exchange. He became diaphoretic and hypotensive and experienced tachycardia. The apheresis procedure was stopped. Because of worsening respiratory distress, endotracheal intubation was performed. A chest x-ray revealed a large right pleural effusion. The central venous catheter was removed. A chest tube was placed, and a large amount of bloody fluid was drained. Several days later, the endotracheal and chest tubes were removed. CONCLUSION: An unusual complication of the use of a central venous catheter, erosion of the superior vena cava, occurred during therapeutic plasma exchange. Prompt recognition of this complication and appropriate therapy can be life-saving.     

Difference of hepatitis B virus genotype distribution in two groups of mexican patients with different risk factors. High prevalence of genotype H and G

BACKGROUND: Hepatitis B virus (HBV) has been classified in eight genotypes, from A to H (HBV/A to HBV/H). HBV genotypes were determined in two groups with different risk factors. METHODS: Group I consisted of 42 patients with chronic and acute hepatitis and group II with 25 men who have sex with men (MSM). HBV genotypes were determined by DNA sequencing of the S-gene. RESULTS: Both groups differed with respect to genotype distribution (p < 0.001). In group I, there were 31 (74%), 9 (21%) and 2 patients (5%) with HBV/H, HBV/D and HBV/A; respectively. In group II, HBV/H, HBV/A, and HBV/G were found in 13 (52%), 8 (32%) and 4 (16%) cases, respectively. By using an HBV/G-specific PCR, 3 more cases of HBV/G were identified in group II, rising to a total 28%. All HBV/G strains were present in coinfection with other HBV genotypes, 86% with HBV/H, and 14% with HBV/A. CONCLUSIONS: HBV/H predominated in both groups. A high frequency of HBV/G was found in MSM, which was always coinfected with HBV/H or HBV/A. Significant differences in HBV genotype distribution were also found, since HBV/D was present only in patients with liver disease, whereas HBV/G was present only in MSM.