Evaluation of combination therapy using aciclovir and corticosteroid in adult patients with herpes simplex virus encephalitis

OBJECTIVE

Herpes simplex virus encephalitis (HSVE) is associated with significant morbidity and mortality, even with appropriate antiviral therapy. In the present investigation, the first to assess efficacy of corticosteroid treatment with aciclovir therapy in HSVE, multiple logistic regression analysis was performed of predictors of outcome in adult patients with HSVE.

METHODS

A non-randomised retrospective study of 45 patients with HSVE treated with aciclovir was conducted. The patients were divided into poor and good groups based on outcome at three months after completion of aciclovir treatment. The variables evaluated were: clinical variables (sex, age, days after onset at initiation of aciclovir, Glasgow Coma Scale (GCS) at initiation of aciclovir, initial and maximum values for the cell numbers and protein concentration in the cerebrospinal fluid, and corticosteroid administration); neuroradiological variables (detection of lesions by initial cranial computed tomography and by initial magnetic resonance imaging); and one neurophysiological variable (detection of periodic lateralised epileptiform discharges on the initial electroencephalogram). Single variable logistic regression analysis was performed followed by multiple logistic regression analysis. The best set of predictors for the outcome of HSVE was estimated by stepwise logistic regression analysis.

RESULTS

A poor outcome was evident with older age, lower GCS score at initiation of aciclovir, and no administration of corticosteroid. Patient age, GCS at initiation of aciclovir, and corticosteroid administration were found to be significant independent predictors of outcome on multiple logistic regression analysis, and these three variables also formed the best set of predictors (R(2) = 0.594, p<0.0001).

CONCLUSION

Combination therapy using both aciclovir and corticosteroid represents one of the predictors of outcome in HSVE.

Laminin-induced autoimmune myositis in rats

The present study aimed to examine if immunization with laminin causes myositis in rats and whether the pathologic findings mirror human polymyositis and dermatomyositis. Rats were immunized with an emulsion of laminin and complete Freund's adjuvant. As a result, muscle fiber necrosis with infiltrating macrophages was frequently observed and mononuclear cells were observed in the endomysium. These mononuclear cells were composed of CD4+ cells, CD8+ T cells, and macrophages. CD4+ cells and CD8+ T cells were mainly located in the endomysium, whereas a large number of macrophages were located in the endomysium and infiltrating muscle fibers. A small number of B cells, detected by immunohistochemical staining, were mainly located in the perimysium. The nonnecrotic muscle fiber to which CD4+ T cells, CD8+ T cells, and perforin+ cells adhered was negative for antimerosin and antidystrophin antibodies. Muscle fiber necrosis in rats immunized with laminin may occur after denaturation of basement membrane proteins. In conclusion, the immunization with laminin induces moderate to severe myositis. We suggest that laminin may be an important antigen for connective tissue diseases such as polymyositis and dermatomyositis.

Physical aging by soft ultrasonic wave enhances ethanol metabolism: metabolic process of wine as followed by 400 mhz 1H-NMR spectroscopy

In natural aging of spirits or wine, the dynamic structure of ethanol-water clusters changes to a smaller and more uniform state. Through experience we know that naturally aged ones have higher metabolism than the non-aged ones. Also, the same effect as natural aging can be obtained in various types of spirits or wines by the treatment for a period of time with soft ultrasonic wave (US). In this study, we compared ethanol metabolism in human subjects dosed with non-treated white wine (control = CON) and with US treated wine. Ethanol levels in human sera were followed by 400 MHz 1H-NMR spectroscopy after administration of wine doses. Experimental results indicated that ethanol metabolism was enhanced 18% in subjects when US treated wine was used rather than when non-treated (CON) was used. Other experiments using rabbits showed that a 20% ethanol-aqueous solution was absorbed 18% more rapidly by the group dosed with US wine than by the CON group. From these experimental facts, it was theorized that ethanol metabolism depends on the rapidity of ethanol absorption in the human body. And it can be concluded that US treatment brings about the same effect on spirits or wines as natural aging.

The effect of human tissue factor pathway inhibitor-2 on the growth and metastasis of fibrosarcoma tumors in athymic mice

Human tissue factor pathway inhibitor-2 (TFPI-2) is a matrix-associated Kunitz inhibitor that inhibits the plasmin- and trypsin-mediated activation of zymogen matrix metalloproteinases involved in tumor progression, invasion, and metastasis. To directly assess its role in tumor growth and metastasis in vivo, we stably transfected HT-1080 fibrosarcoma cells expressing either fully active wild-type human TFPI-2 (WT) or inactive R24Q TFPI-2 (QT) and examined their ability to form tumors and metastasize in athymic mice in comparison to mock-transfected cells (MT). MT and QT fibrosarcoma tumors grew 2 to 3 times larger than WT tumors. Tumor metastasis was confined to the lung and was observed in 75% of mice treated with either MT or QT cells, whereas only 42% of mice treated with WT cells developed lung metastases. Real-time quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) analyses of each tumor group revealed 3- to 6-fold lower levels of murine vascular endothelial growth factor gene expression in WT tumors in relation to either MT or QT tumors. Comparative tumor gene expression analysis revealed that several human genes implicated in oncogenesis, invasion, metastasis, apoptosis, and angiogenesis had significantly altered levels of expression in WT tumors. Our collective data demonstrate that secretion of inhibitory TFPI-2 by a highly metastatic tumor cell markedly inhibits its growth and metastasis in vivo by regulating pericellular extracellular matrix (ECM) remodeling and angiogenesis. (Blood. 2004;103:1069-1077)

Analysis of dystrophin mRNA from skeletal muscle but not from lymphocytes led to identification of a novel nonsense mutation in a carrier of Duchenne muscular dystrophy

Dystrophin mRNA expressed in peripheral lymphocytes of individuals with X-linked Duchenne muscular dystrophy (DMD) has been used as a source material for mutation analysis. Here we present the first report of failure of isolation of nonsense dystrophin mRNA in lymphocytes but success in skeletal muscle in a female carrier of DMD. The mutation responsible for dystrophin-negative muscle fibers of the carrier was analysed by direct sequencing of the reverse transcription PCR product of dystrophin mRNA. In her peripheral lymphocytes, no nucleotide change was detected in the 14 kb long mRNA. Remarkably, a novel nucleotide change of C1682T in exon 12, changing glutamine codon to stop codon (Q492X) was found to be present in her skeletal muscle. This change was heterozygous. Analysis of her genomic DNA disclosed heterozygous C and T nucleotides at nt 1682, confirming the genomic origin of the nonsense mutation. Although dystrophin cDNA prepared from lymphocytes was sequenced again after subcloning, mutation-retaining clone could not be isolated. This lymphocyte-specific disappearance of nonsense mRNA strongly suggested tissue-specific skewing of X-inactivation. However, both paternal and maternal dystrophin alleles were shown to be equally expressed in lymphocytes as well as in muscle, indicating no skewing of X-inactivation in lymphocytes. We concluded that the dystrophin mRNA of the DMD carrier was destabilized in lymphocytes. Our results indicated that analysis of mRNA in lymphocytes is not enough for exact carrier diagnosis of Duchenne muscular dystrophy.

Alterations of quantitative EEG and mini-mental state examination in interferon-alpha-treated hepatitis C

We have recently observed a diffuse slowing of brain waves using serial quantitative electroencephalographic (qEEG) examinations in interferon (IFN)-alpha-treated chronic hepatitis C patients. However, it remains unclear how this alteration could be assessed. We evaluated the correlation between the qEEG changes and three tests of mental status, including the Mini-Mental State Examination (MMSE), in such patients. This is the first study to undertake a clinical evaluation of the adverse effects on brain function due to IFN. We undertook blind, prospective and serial qEEG examinations on 56 chronic hepatitis C patients at three independent hospitals. IFN-alpha was administered intramuscularly at a dose of 9 x 10(6) IU daily for the first 4 weeks and then 3 times/week for the next 20 weeks. Serial EEGs were obtained before, at 2 and 4 weeks of treatment, and after the IFN-alpha treatment. The absolute power values of each frequency band in each patient at different stages of treatment were recorded by qEEG. Each patient was assessed by the MMSE, Hamilton Rating Scale for Depression (HSD), and Hamilton Rating Scale for Anxiety (HSA). We statistically evaluated the correlations between the changes in power values and alterations of scores on the mental status tests during IFN-alpha treatment. The decreased scores observed on the MMSE ranged from 2 to 5 points at both 2 and 4 weeks of IFN-alpha treatment. There were no significant differences in age distribution for each decreased score on the MMSE. As the alteration in MMSE score during IFN treatment increased, the alteration in absolute power values for the slow waves during IFN treatment increased significantly, while that for the alpha 2 and fast waves during treatment decreased significantly. However, the changes in the HDS and HSA revealed no significant correlations. The alteration of the qEEG was reversible after the treatment. MMSE scores represent one screening method for the clinical assessment of IFN-alpha-induced alterations of brain function.

[Neuro-infections to be borne in mind]

We presented atypical manifestations in tuberculous meningitis (TbM) and herpes simplex encephalitis (HSE), lymphocytic dominant cerebrospinal fluid pleocytosis in bacterial meningitis, and a hitherto easily overlooked critical illness polyneuropathy (CIP) associated with sepsis. 1) We presented 2 TbM patients with atypical manifestations. One patient was a 25-year-old man who exhibited polymorphonuclear (PMN) dominant pleocytosis in CSF throughout his clinical course. He died the next day after a CSF culture yielded the growth of tuberculous bacilli, before receiving appropriate anti-TBM therapy. This was a rare TbM example of persistent PMN dominant CSF pleocytosis. The other patient was a 39-year-old woman whose CSF pleocytosis changed from lymphocytic dominant to PMN dominant about 1 month after the initiation of antituberculous chemotherapy. This CSF change was followed by multiple cerebral infarcts due to vauculitis caused by TbM. Administration of prednisolone caused marked improvement of the patient's symptomatology. Tuberculomas appeared transiently during anti-TbM therapy, consistent with paradoxical progression of tuberculoma. 2) A few patients with HSE may show atypical CSF findings such as PMN dominant pleocytosis, absence of pleocytosis, and low sugar value. Our national survey of HSE patients showed following percentages of these atypical findings: PMN dominant pleocytosis observed in 10% of the patients in the early stage and at the time of exacerbation, no pleocytosis in 0.9% (1 patient), and low sugar value in 4%. 3) Bacterial meningitis typically causes PMN dominant CSF pleocytosis. However, Listeria meningitis (LM) may cause lymphocytic dominant pleocytosis in 30% of the patients, particularly in elderly ones. We showed one such 69-year-old patient with persistent lymphocytic dominant CSF pleocytosis throughout the clinical course. 4) CIP, septic encephalopathy and critical illness myopathy are 3 major complications associated with sepsis. CIP is a frequent cause of neuromuscular weakness due to axonal dysfunction, which occurs to critically ill patients with sepsis, particularly when multiple organ dysfunctions are present. We showed our CIP patient associated with acute bacterial endocarditis and multiple organ failure. We should bear in mind these atypical manifestations, and frequent and important complications associated with sepsis such as CIP, to provide appropriate management to patients with neuro-infection and sepsis.

Basophil activation during pollen season in patients monosensitized to grass pollens

BACKGROUND

Basotest is a new basophil-activation test based upon the expression of CD63 (gp53) in the presence of allergens. It is an effective diagnostic test for pollen-allergic patients. However, it is not known whether Basotest results differ during the pollen season.

METHODS

We examined the activation of basophils by Basotest in 13 patients sensitized only to grass pollen, before and during the pollen season, in order to assess whether Basotest could be used as a diagnostic test during the pollen season. Dose-response curves with 10-fold increasing concentrations of timothy grass pollen (10-4 to 100 AU) were carried out.

RESULTS

Basophils were not activated spontaneously during the pollen season since the CD63 expression was below detectable levels before in vitro cell activation. A decreased percentage of activated basophils at the peak of activation was found in comparing the pre- and in-season tests, but all patients had a positive test. When basophil activation was at its peak, the allergen concentration was similar during the two periods. Moreover, the median area under the curve was significantly (P < 0.02) reduced during the season as compared to before the season.

CONCLUSION

Basotest can therefore be used as a diagnostic test during the pollen season, but the allergen exposure needs to be characterized if quantitative studies are performed.

The usefulness of intraoral ultrasonography in the evaluation of oral cancer

Many studies focused on the tumour thickness in oral squamous cell carcinomas, suggesting a relationship with the occurrence of cervical metastasis. Accurate preoperative assessment of the tumour thickness of oral cancer would provide useful information for targeting those patients who need elective treatment of the neck. Some useful diagnostic aids to evaluate oral cancer are computed tomography (CT), magnetic resonance imaging (MRI), and intraoral ultrasonography. The purpose of the present study is to compare intraoral ultrasonography with CT and MRI in delineating the disease extent and in measuring the tumour thickness of oral carcinoma. Thirty-nine patients with oral cancer were preoperatively evaluated with intraoral ultrasonography, and CT, and in 26 of them MRI was carried out. High-quality ultrasonographic images were obtained and the tumour thickness was measured within 1 mm. However, in most tumours less than 5.0 mm in thickness, CT and MRI could not detect a sufficient density difference from the normal tissue to accurately delineate the extent of the tumour. There was a significant correlation between measurements by intraoral ultrasonography and the histological sections. The present study shows that ultrasonography is superior to CT and MRI in assessment of the primary lesion of oral carcinoma.

Serum concentration of interferon-alpha: a comparison between once-a-day and twice-a-day administration

The aim of this study was to determine the possible mechanism of the antiviral activity of twice daily administration of interferon (IFN)-alpha for active hepatitis C and to evaluate serum concentrations of IFN-alpha with enzyme-linked immunosorbent assay (ELISA). Forty-seven patients with active hepatitis C received IFN-alpha intramuscularly for 24 weeks. They were divided into once-a-day and twice-a-day groups. Changes in serum IFN-alpha levels were assessed during the treatment period. Compared with twice-a-day treatment, the once-a-day group showed no increase in serum IFN-alpha at the end of daily treatment (p < 0.03). In contrast, one-third of the twice-a-day group showed increased IFN-alpha at the end of daily treatment (p < 0.02). In conclusion, measured with ELISA, twice-daily administration of IFN-alpha manifested prolonged elevation in serum levels when compared with once daily administration.

Level of plasma tissue factor pathway inhibitor is inversely correlated with intraarterial diastolic pressure in subjects who underwent coronary angiography

There are only a few studies of the relationship between hemostatic abnormalities and intraarterial pressure, so the present study investigated the association of various newer lipid and hemostatic variables with intraarterial pressure levels. Levels of total cholesterol, high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol, triglyceride, lipoprotein-(a), remnant-like particle cholesterol, cholesteryl ester transfer protein, uric acid, blood glucose, fibrinogen, free form of tissue factor pathway inhibitor (TFPI), C-reactive protein, serum amyloid A protein, anti-Chlamydia pneumoniae immunoglobulin G and immunoglobulin A, and apolipoproteins (apo) A-I, B, and E were measured in 176 patients who underwent diagnostic coronary angiography. Intraarterial blood pressure was determined from central aortic pressure using a standard fluid-filled catheter-external transducer system. Multivariate regression analyses showed that TFPI level was the only independent factor associated with aortic diastolic pressure. The linear regression equation demonstrated a significant negative correlation of TFPI level with aortic diastolic pressure (r=-0.395, p=0.0011). With respect to the association with other parameters, the TFPI level showed significant correlations between the HDL-C level and the apo A-I level, both in the overall patients and in the patients with coronary artery stenosis. This is the first evidence that the level of the plasma free form of TFPI is inversely correlated to aortic diastolic pressure.

Genomic structure and promoter activity of the human tissue factor pathway inhibitor-2 gene

Human type-2 tissue factor pathway inhibitor (TFPI-2), also known as placental protein 5, is a 32 kDa serine proteinase inhibitor consisting of three tandemly arranged Kunitz-type inhibitor domains homologous to tissue factor pathway inhibitor. TFPI-2 strongly inhibits a wide variety of serine proteinases including trypsin, chymotrypsin, plasmin, kallikrein and blood coagulation factor XIa. In this study, we have isolated and characterized a genomic clone from an artificial chromosome genomic library that encodes the entire human TFPI-2 gene. The human TFPI-2 gene spans approximately 7 kb and consists of five exons and four introns. Each Kunitz-type domain is encoded by a single exon, similar to that observed for murine TFPI-2 and other Kunitz-type proteinase inhibitors. A total of 535 bp of the 3'-flanking region contain two probable polyadenylation sites (AATAAA) at +4297 and +4314. A single transcription initiation site was identified by oligo-capping and reverse transcription-PCR analysis. Transient transfection of reporter plasmids containing segments of the 5'-flanking region into human transformed bone marrow endothelial cells and glioblastoma cells identified an 85 bp region (-224 to -139) sufficient for transcription of the human TFPI-2 gene.

p53 independent G(1) arrest induced by DL-alpha-difluoromethylornithine

Ornithine decarboxylase (ODC), which catalyzes polyamine biosynthesis, plays an essential role in cell growth. DL-alpha-Difluoromethylornithine (DFMO), a synthetic inhibitor of ODC, inhibits cell growth. However, the exact mechanism by which polyamine depletion by DFMO results in growth inhibition remains to be elucidated. We clarified the mechanisms by which DFMO inhibits human gastric cancer cell (MKN45) growth. DFMO induced MKN45 cell G(1) phase arrest after 48 h, and the percentage of G(1) arrest cells continued to increase until 72 h. Expression of p21 and phosphorylation of Stat1 were significantly induced by DFMO at 24 h. Luciferase assay and gel shift assay showed specific binding of Stat1 to the p21 promoter, and promoter activity was activated at 24 h. In dominant negative p53 expressing cells, DFMO significantly induced p21 expression, arrested cells at G(1) phase, and suppressed cell growth effectively. These results suggest that DFMO induced MKN45 cell arrest at G(1) phase in a p53 independent manner, and Stat1 is, at least in part, involved in G(1) arrest.

1alpha,25-dihydroxyvitamin D(3) and its potent synthetic analogs downregulate tissue factor and upregulate thrombomodulin expression in monocytic cells, counteracting the effects of tumor necrosis factor and oxidized LDL

BACKGROUND

We have recently found that a hormonally active form of vitamin D, 1alpha,25-dihydroxyvitamin D(3) [1,25(OH)(2)D(3)], exerts anticoagulant effects by upregulating the expression of an anticoagulant glycoprotein, thrombomodulin (TM), and downregulating the expression of a critical coagulation factor, tissue factor (TF), in monocytic cells including human peripheral monocytes. In this study, we investigated the counteracting effects of 1,25(OH)(2)D(3) and its potent analogs on TF induction and TM downregulation by tumor necrosis factor and oxidized LDL in monocytic cells and the modulatory effects of potent analogs on TF and TM expression.

METHODS AND RESULTS

Effects of 1,25(OH)(2)D(3) and its potent synthetic analogs (22R)-22-methyl-20-epi-1,25(OH)(2)D(3) (KY3) and 22-oxacalcitriol on TF and TM antigen levels, cell surface activities, and mRNA levels in monocytic cells were examined. 1, 25(OH)(2)D(3) and its potent analogs showed anticoagulant effects in monocytic cells by downregulating TF and upregulating TM expression, counteracting the effects of tumor necrosis factor and oxidized LDL. KY3 was most potent in its regulatory effect on TF and TM expression.

CONCLUSIONS

Because KY3 has the highest affinity for vitamin D receptor, our findings suggest that TF and TM regulation by 1, 25(OH)(2)D(3) analogs is also mediated by vitamin D receptor. The 1, 25(OH)(2)D(3) analogs KY3 and 22-oxacalcitriol may have the potential to serve as an agent for preventing and treating atherosclerotic and other cytokine-mediated thrombotic diseases and as a tool for studying the molecular mechanisms of TF and TM regulation.

Nationwide survey of the annual prevalence of viral and other neurological infections in Japanese inpatients

OBJECTIVE

To estimate the annual prevalence of viral and other neurological infections at large hospitals in Japan during the period from 1989 to 1991.

METHODS

A nationwide questionnaire survey on the numbers of inpatients with viral and other neurological infections was sent for completion to the chiefs of Departments of Internal Medicine, Neurology and Pediatrics at all hospitals with more than 200 beds.

RESULTS

The average annual number of inpatients (and the number per 10(6) population) with encephalitis in large hospitals was estimated to be 2,200+/-400 (17.7+/-3.2), while it was 32,000+/-16,000 (258+/-129) for meningitis, and 650+/-50 (5.2+/-0.4) for myelitis. Among the inpatients with encephalitis, meningitis, and myelitis, an unknown etiology was the most common (51.2% in encephalitis, 73.2% in meningitis, and 36.3% in myelitis), followed by a viral etiology for all three diseases.

CONCLUSION

The first estimate was made of the annual prevalence of viral and other neurological infections and their etiology in Japan.

Molecular and structural studies of Japanese patients with sialidosis type 1

To gain insight into the pathogenesis of sialidosis type 1, we performed molecular investigations of two unrelated Japanese patients. Both of them are compound heterozygotes for base substitutions of 649G-to-A and 727G-to-A, which result in amino acid alterations V217M and G243R, respectively. Using homology modeling, the structure of human lysosomal neuraminidase was constructed and the structural changes caused by these missense mutations were deduced. The predicted change due to V217M was smaller than that caused by G243R, the latter resulting in a drastic, widespread alteration. The overexpressed gene products containing these mutations had the same molecular weight as that of the wild type, although the amounts of the products were moderately decreased. A biochemical study demonstrated that the expressed neuraminidase containing a V217M mutation was partly transported to lysosomes and showed residual enzyme activity, although a G243R mutant was retained in the endoplasmic reticulum/Golgi area and had completely lost the enzyme activity. Considering the data, we surmise that the V217M substitution may be closely associated with the phenotype of sialidosis type 1 with a late onset and moderate clinical course.

Characterization of a novel member of the FGFR family, HrFGFR, in Halocynthia roretzi

The cDNA for a novel member of the FGFR family, named HrFGFR, was isolated from a Halocynthia roretzi cDNA library prepared at the mid-tailbud stage. This cDNA was 3507b long, and the deduced amino acid sequence contained a motif characteristic of the vertebrate FGFRs. The existence of a single copy of the FGFR homologue gene in H. roretzi was suggested by restriction site analysis of multiple clones. HrFGFR mRNA was expressed strongly in the posterior region in the epidermis from the middle neurula stage. By contrast, Xenopus FGFR homologues are expressed in the anterior region and are known to induce anterior neural formation. A transition of the region expressing FGFR might have induced the more complicated brain or head formation characteristic of vertebrates.

Predictive value of remnant-like particle cholesterol as an indicator of coronary artery stenosis in patients with normal serum triglyceride levels

OBJECTIVE

We designed the present study to evaluate the association of various lipid and fibrinolytic components with coronary artery stenosis with respect to the triglyceride (TG) level.

METHODS

Levels of TG, remnant-like particle cholesterol (RLP-C), total cholesterol, high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), lipoprotein-(a), uric acid, blood glucose, tissue plasminogen activator (t-PA), t-PA inhibitor type 1, antithrombin III, and protein C were measured in 208 patients who underwent diagnostic coronary angiograms.

PATIENTS

Of these 208 patients, 59 were hypertriglyceridemic (150 mg/dl or higher) and 149 were normotriglyceridemic.

RESULTS

Both LDL-C and HDL-C showed significant differences between patients with and those without coronary artery stenosis in both hypertriglyceridemic and normotriglyceridemic patient subgroups. However, RLP-C showed a significant difference in the normotriglyceridemic patient subgroup (p=0.012) but not in the hypertriglyceridemic patient subgroup (p=0.736).

CONCLUSION

Our current retrospective study disclosed that RLP-C levels are closely associated with coronary artery stenosis in patients with normal TG levels.

[Small cell carcinoma of the urinary bladder: a case report]

We report a case of small cell carcinoma of the urinary bladder. The patient was a 58-year-old man complaining of gross hematuria. Clinical examination revealed a non-papillary, broad-based tumor on the right bladder wall with a clinical stage of T3a, N0, M0. Neoadjuvant intraarterial infusion chemotherapy with methotrexate, adriamycin and cisplatin was performed, but it was ineffective. Three weeks later we performed a radical cystectomy. The operative specimen of the tumor revealed small cell carcinoma. It was staged pT3aN0M0R0L2V1. Postoperatively, 1 course of adjuvant chemotherapy using cisplatin and etoposide was performed. The patient is alive without any evidence of tumor recurrence at 6 months after operation.

Laparoscopic findings in an adult case of Alagille syndrome

Laparoscopic findings in a 32-year-old woman presenting with Alagille syndrome are reported. The liver surface showed a segmental whitish discoloration on the surface of both lobes with a transverse sulcus which was not stained enough after an intravenous injection of indocyanine green (ICG). These findings suggested an acquired bile duct injury in addition to a congenital anomaly of the bile duct in this patient.

Keratinocyte expression of transgenic hepatocyte growth factor affects melanocyte development, leading to dermal melanocytosis

Using the epidermis-specific cytokeratin 14 promoter to deliver HGF exclusively from epidermal keratinocytes, we have examined the potential of hepatocyte growth factor (HGF) secreted from the normal environment to control morphogenesis. The transgenic mice displayed a significant increase of the number of melanocytes and their precursors in embryos starting not later than 16.5 dpc, and then after birth an explosive increase of dermal melanocytes started within 1 week, and these melanocytes were maintained throughout the entire life of the mice. Thus, HGF acts as a paracrine agent to promote survival, proliferation and differentiation of melanocyte precursors in vivo, and eventually causes melanocytosis. Loss of E-cadherin expression in dermal melanocyte precursors suggests that HGF caused dermal localization of melanocytes and their precursors by down-regulation of E-cadherin molecules.

Characterization of a murine monoclonal antibody that mimics heparin-induced thrombocytopenia antibodies

Antibodies to PF4/heparin can be demonstrated in almost all patients with heparin-induced thrombocytopenia/thrombosis (HIT/HITT) and in some persons exposed to heparin who do not have clinical manifestations. The role of anti-PF4/heparin antibodies in the pathogenesis of HIT/HITT has been difficult to establish because the antibodies found in serum are generally polyclonal and polyspecific. To circumvent this problem, we developed a murine monoclonal antibody (mAb) to human (h) PF4/heparin complexes. A monoclonal IgG(2bkappa )antibody (designated KKO) was identified that bound specifically to hPF4/heparin complexes. Maximal binding of KKO to hPF4/heparin complexes occurred at similar molar ratios of PF4:heparin observed for HIT/HITT antibodies. KKO also bound to hPF4 in association with other glycosaminoglycans. Platelet activation by KKO required heparin and was abrogated by blockade of FcgammaRIIA. In the presence of PF4, KKO bound to endothelial cells, but not to CHO cells lacking heparan sulfate proteoglycans. Variants of PF4 complexed to heparin were recognized equally well by KKO and HIT/HITT sera. KKO competes for binding with a subset of HIT/HITT antibodies that are relatively spared by mutations in the 3rd domain of PF4. The nucleotide and predicted amino acid sequences of KKO and RTO, a murine anti-hPF4 mAb that does not require heparin for binding, revealed no obvious relationship in either the heavy- or the light-chain immunoglobulin variable regions. These studies suggest that KKO recapitulates the antigenic and functional specificity of a subset of HIT/HITT antibodies and may, therefore, provide insight into the pathogenesis of thrombocytopenia and thrombosis in affected persons. (Blood. 2000;95:1533-1540)