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Biomedical subjects

J Arata

Publications and source records attributed to J Arata.

At least 109 records · Page 6Linked to original sources
PubMed1992

[Methicillin-resistant Staphylococcus aureus in dermatology].

Staphylococcus aureus (SA) is among the most important causes of skin infections. The incidence of Methicillin-resistant SA (MRSA) strains isolated from skin and skin structure infections was about 20-40%. In deep-seated pyoderma such as furuncle and furunculosis, MRSA was more frequently isolated than in other type of infectious diseases of the skin. But the incidence was gradually increasing. As to coagulase typing, type IV was most frequently isolated in MRSA. The damaged skin is easily colonized by high numbers of SA on its surface and within hair follicles. Through the indwelling catheters or decubitus SA on the skin could cause easily severe systemic MRSA infections such as sepsis or endocarditis of in-patients.

Humans↗
PubMed1992

[Levofloxacin in the field of dermatology].

1. Minimum inhibitory concentrations (MICs) of levofloxacin (LVFX, DR-3355), ofloxacin (OFLX), tosufloxacin (TFLX), norfloxacin (NFLX) were determined, with an inoculum size of 10(6) cfu/ml, against 122 strains of Staphylococcus aureus isolated from lesions of skin infections. LVFX showed most frequent MIC values of 0.20 micrograms/ml. OFLX, TFLX, and NFLX showed most frequent MIC values of 0.39 micrograms/ml, less than or equal to 0.05 micrograms/ml and 0.78 micrograms/ml, respectively. 2. Serum and skin levels of LVFX after oral administration (10 mg/kg, fasting) were determined in rats. Serum levels were 1.79, 1.29, 0.60, 0.43 and 0.18 micrograms/ml, and corresponding skin levels were 1.63, 1.77, 1.04, 0.87 and 0.64 micrograms/g (wet weight) at 0.5, 1, 2, 4 and 8 hours after administration (n = 5), respectively. 3. LVFX was used clinically in 43 cases at doses of 200-300 mg divided into 2 or 3 doses, and evaluated for final overall clinical efficacy in 41 cases. Cure was observed in 21 cases, remarkable improvement in 13 cases, improvement in 4 cases, unchanged in 1 case, aggravation in 1 case, and remarkable aggravation in 1 case. Diarrhea was observed in 2 cases, diffuse erythema with feverishness in 1 case and slight dyspnea in 1 case. Transient slight eosinophilia, elevation of Al-P, anemia and leukopenia were observed.

Adolescent↗
PubMed1992

[A multicenter study on panipenem/betamipron in dermatology].

Panipenem/betamipron (PAPM/BP), a new carbapenem, was studied in dermatology. PAPM/BP was used clinically in the treatment of skin and skin structure infections in a multicenter trial. Fifty three patients were enrolled in the trial. Clinical evaluations were made in 50 patients. Most patients received intravenous infusion of PAPM/BP in a dose of 500 mg twice daily. Other dosages were used in some patients. The overall clinical efficacy rate was 78%. When 15 cases of secondary infections were excluded, the rate was 85.7%. Adverse responses were nausea and/or vomiting in 3 patients, redness with itching in 1 patient, headache or head heaviness in 2 patients and diarrhea in 1 patient. The patient with redness and itching had also nausea and vomiting. This occurred 1 hour after the start of the first infusion of this drug. After the discontinuation of the treatment the symptoms went away on the next day. Abnormalities in laboratory test results were observed in 7 out of 53 patients. One patient with liver cirrhosis and hepatocellular carcinoma developed anemia (RBC 372 x 10(4)/mm3----275 x 10(4)/mm3, Hb 11.9 g/dl----8.8 g/dl, 35.1%----26.0%). Other abnormalities were all mild. Penetration of the drug into skin tissues after intravenous infusion of 500 mg of this drug in skin surgery patients was studied. Skin/serum concentration ratios ranged from 0.20 to 0.97. Skin concentrations were higher than the concentration of PAPM inhibiting 80% of clinical isolates over a period of 6 hours. In rats, skin concentrations were much lower than serum concentrations probably due to the difference in in vivo metabolism of PAPM. A few resistant strains of Staphylococcus aureus against PAPM and imipenem (IPM) were isolated. However, PAPM and IPM showed good antibacterial activities compared to other drugs tested. In conclusion, PAPM/BP is considered to be a useful drug in the treatment of skin and skin structure infections.

Adolescent↗
PubMed1991

Giant neuroendocrine (Merkel cell) carcinoma of the skin.

An 82-year-old woman had a dark red to purple tumor on the left buttock that had gradually enlarged during the last 5 years. Although routine histologic examination was not sufficient for diagnosis, neuroendocrine carcinoma was diagnosed by immunohistochemical and ultrastructural studies. Immunohistochemical-positive reactions to neurofilament, cytokeratin, neuron-specific enolase, and epithelial membrane antigen were noted. Electron microscopically, membrane-bound, dense core granules that yielded a positive uranaffin reaction and intermediate filaments in the perinuclear area were observed in the cytoplasm of most tumor cells. Desmosome-like structure between them was also found. Approximately 6 months after local excision, metastatic lesions developed in the regional lymph nodes and liver.

Actins↗
PubMed1991

Linear lupus erythematosus profundus in a child.

A 9-year-old Japanese boy had a 6-year history of a linear eruption of the left leg. It was characterized histopathologically by an intense lymphocytic panniculitis, perivascular and periappendageal infiltrates of lymphocytes, and vacuolization of the basal cell layer. This case represents a clinical presentation of linear lupus erythematosus profundus not previously reported.

Basement Membrane↗
PubMed1991

Calcium deposition in the skin of a hemodialysis patient with widespread skin necrosis.

Rapidly progressive skin necrosis involving large areas of the skin associated with extensive vascular calcification was observed in a 39-year-old male patient on chronic hemodialysis. Histological examination of the periphery of a skin ulcer showed that subepidermal arterioles were occluded with fibrin deposits and that calcification was demonstrated in subcutaneous small arteries and arterioles. Electron microscopically, electron-dense materials, granular, crystal-like, vacuolar, or laminated, were found not only in arterial walls of the periphery of an ulcer but also, to a lesser extent, in those of normal-appearing skin. The skin necrosis gradually healed with antiseptic topical treatments and the injection of recombinant erythropoietin. The relationship between the vascular lesions in hemodialysis patients and progressive skin necrosis is not well known, although a combination of local and systemic factors may play an important role in the development of vascular calcification and skin necrosis in uremic and hemodialysis patients.

Adult↗
PubMed1991

Trigeminal trophic syndrome--a report of three patients.

Three Japanese patients with trigeminal trophic syndrome, a rare dermatosis in Japan, were reported. Cutaneous lesions were a long-standing ulcer and destruction of the right ala nasi in case 1, a persistent deep ulceration on the forehead after a small trauma in case 2, and development of small, discrete ulcers on the right forehead during the treatment of a postherpetic neuralgia in case 3. A protective device was very effective in one patient.

Aged↗
PubMed1991

Molecular defect in siblings with prolidase deficiency and absence or presence of clinical symptoms. A 0.8-kb deletion with breakpoints at the short, direct repeat in the PEPD gene and synthesis of abnormal messenger RNA and inactive polypeptide.

Prolidase deficiency is an autosomal recessive disorder with highly variable symptoms, including mental retardation, skin lesions, and abnormalities of collagenous tissues. In Japanese female siblings with polypeptide negative prolidase deficiency, and with different degrees of severity of skin lesions, we noted an abnormal mRNA with skipping of 192 bp sequence corresponding to exon 14 in lymphoblastoid cells taken from these patients. Transfection and expression analyses using the mutant prolidase cDNA revealed that a mutant protein translated from the abnormal mRNA had an Mr of 49,000 and was enzymatically inactive. A 774-bp deletion, including exon 14 was noted in the prolidase gene. The deletion had termini within short, direct repeats ranging in size of 7 bp (CCACCCT). The "slipped mispairing" mechanism may predominate in the generation of the deletion at this locus. This mutation caused a 192-bp in-frame deletion of prolidase mRNA and was inherited from the consanguineous parents. The same mutation caused a different degree of clinical phenotype of prolidase deficiency in this family, therefore factor(s) not related to the PEPD gene product also contribute to development of the clinical symptoms. Identification of mutations in the PEPD gene from subjects with prolidase deficiency provides further insight into the physiological role and structure-function relationship of this biologically important enzyme.

Amino Acid Sequence↗
PubMed1991

[Punctate porokeratotic keratoderma].

A 39-year-old woman had numerous keratotic papules on the volar surface of the right palm, both soles, fingers and toes. There were some spiny plugs on the edges of her toes. Histologic examination revealed a cornoid lamella. "Punctate porokeratotic keratoderma" "porokeratosis punctata palmaris et plantaris" refer probably to related conditions "keratosis punctate palmaris et plantaris". We prefer the term "punctate porokeratotic keratoderma".

Adult↗
PubMed1991

[Skin penetration of antimicrobial agents in rats].

Skin penetration of various antimicrobial agents was studied in rats. Skin concentration/serum concentration ratios were classified into three groups, i.e. group I with ratio greater than or equal to 0.7, group II with the ratio 0.7-0.4 and group III with the ratio less than or equal to 0.4. The drugs of group I were OFLX, CPFX, LFLX, FLRX, SPFX, AMK, EM, RXM, CAM, CLDM. The drugs of group II were ABPC, CVA/AMPC, CVA/TIPC, CEX, CED, CXD, CTM-HE, CXM-AX, CPZ, CBPZ, TFLX, ASTM, MINO. The drugs of group III were AMPC, CCL, CDX, CPDX-PR, CFTM-PI, CTZ, CEC, CEZ, CTM, CMZ, CZON, MCR, IPM/CS. Factors which may influence the skin penetration were discussed, but no definite conclusion has not been obtained.

Animals↗
PubMed1990

Characterization of prolidase I and II from erythrocytes of a control, a patient with prolidase deficiency and her mother.

Prolidase I (EC 3.4.13.9) was purified to homogeneity from the erythrocytes of a normal human (control) and the patient's mother, and prolidase II from erythrocytes of a control and the patient's mother, and prolidase from the patient's erythrocytes was also highly purified. The various properties of the patient's prolidase were compared to those of prolidase from a control and the patient's mother. Prolidase I from a control and the patient's mother had a molecular weight of about 112,000, and was composed of two subunits with an identical molecular weight of 56,000. The Km values for Gly-Pro of the control's and the patient's mother's prolidase I were 2.90 +/- 0.22 and 2.88 +/- 0.27 mM, but the Vmax values for Gly-Pro of the mother's enzyme was reduced about 30% compared to that of control enzymes (mother: 6.02 units/mg protein, control: 22.21 units/mg protein). Isoionic points of these enzymes by chromatofocusing were pH 4.6 approximately 4.7. Prolidase II from the control and the patient's mother, and the patient's prolidase had a molecular weight of about 185,000, and was composed of two subunits with an identical molecular weight of 95,000. The Km and Vmax values for various substrates of prolidase II from a control and the patient's mother, and the patient's prolidase were almost the same.

Chromatography, Gel↗
PubMed1990

Characterization of fibroblast-derived prolidase. The presence of two forms of prolidase.

Crude enzyme solutions of prolidase were extracted from cultured human skin fibroblasts derived from control and prolidase-deficient sisters. Two forms of prolidases (prolidase-I and II) were partially purified by high performance liquid chromatography equipped with an ion exchange column. On gel filtration, the relative molecular weights of prolidase-I and II were estimated to be MW = 105,000 and 151,000, respectively. The substrate specificity of partially purified prolidase-I and II in control fibroblasts was estimated against Gly-Pro, Ala-Pro, Met-Pro. Each form of prolidase differed in its substrate specificity. In prolidase-deficient sisters, the elder with typical clinical manifestations and the younger with only slight clinical manifestations, the activity of prolidase-I was absent. However, the activity of prolidase-II was sufficiently present in both sisters. The substrate specificity of prolidase-II in the patients was similar to that of control. No difference in substrate specificity was found between these two patients.

Adolescent↗
PubMed1990

Linear epidermal nevus with acantholytic dyskeratosis in an infant.

A 7-month-old boy came to use with flat papules and small erosions on the extensor aspect of his left forearm and a linear arrangement of verrucous papules on the dorsum of his left hand. Histological examination revealed hyperkeratosis, parakeratosis, irregular acanthosis, and marked acantholysis from suprabasal through upper epidermis. This is the first reported case of linear epidermal nevus with acantholytic dyskeratosis in Japan.

Acantholysis↗
PubMed1990

Biochemical basis of prolidase deficiency. Polypeptide and RNA phenotypes and the relation to clinical phenotypes.

Cultured skin fibroblasts or lymphoblastoid cells from eight patients with clinical symptoms of prolidase deficiency were analyzed in terms of enzyme activity, presence of material crossreacting with specific antibodies, biosynthesis of the polypeptide, and mRNA corresponding to the enzyme. There are at least two enzymes that hydrolyze imidodipeptides in these cells and these two enzymes could be separated by an immunochemical procedure. The specific assay for prolidase showed that the enzyme activity was virtually absent in six cell strains and was markedly reduced in two (less than 3% of controls). The activities of the labile enzyme that did not immunoprecipitate with the anti-prolidase antibody were decreased in the cells (30-60% of controls). Cell strains with residual activities of prolidase had immunological polypeptides crossreacting with a Mr 56,000, similar to findings in the normal enzyme. The polypeptide biosynthesis in these cells and the controls was similar. Northern blot analyses revealed the presence of mRNA in the polypeptide-positive cells, yet it was absent in the polypeptide-negative cells. The substrate specificities analyzed in the partially purified enzymes from the polypeptide-positive cell strains differed, presumably due to different mutations. Thus, there seems to be a molecular heterogeneity in prolidase deficiency. There was no apparent relation between the clinical symptoms and the biochemical phenotypes, except that mental retardation was present in the polypeptide-negative patients. The activities of the labile enzyme may not be a major factor in modifying the clinical symptoms.

Adolescent↗
PubMed1990

[Combination effects of fosfomycin and other oral antimicrobial agents against methicillin-resistant Staphylococcus aureus].

Combination effects of fosfomycin (FOM) and other oral antimicrobial agents were studied against methicillin-resistant Staphylococcus aureus (MRSA) (methicillin: minimal inhibitory concentration (MIC) greater than or equal to 12.5 micrograms/ml) isolated from skin and skin structure infections. The fractional inhibitory concentration (FIC) index equal to or less than 0.5 was seen in 63.0% of 27 MRSA strains for FOM and minocycline combination, in 44.4% for FOM and cefatrizine, in 44.4% for FOM and cefaclor, in 40.7% for FOM and cefalexin, in 37.0% for FOM and doxycycline, in 29.6% for FOM and erythromycin, in 22.2% for FOM and rokitamycin, in 18.5% for FOM and ofloxacin, in 14.8% for FOM and sultamicillin, in 11.1% for FOM and clavulanic acid/amoxicillin. The combination effects of FOM and minocyclin, or FOM and cephalosporins were higher than other combinations with FOM. Combination of FOM with other antibiotics could be a useful way to treat MRSA skin and skin structure infections.

Administration, Oral↗
PubMed1990

CD8+ cutaneous T-cell lymphoma with pagetoid epidermotropism and angiocentric and angiodestructive infiltration.

A 68-year-old woman had a peculiar clinical course of cutaneous lymphoma. She first developed nonpuritic erythematous macules with fine scales followed by development of erythematous infiltrated plaques. The clinical course could be interpreted as that of mycosis fungoides. Histologically, the lesions showed pagetoid infiltration of atypical lymphoid cells. Suddenly, with high fever, numerous purpuric, ulcerated, or crusted plaques with underlying infiltration or nodules began to appear on most areas of the patient's body. Biopsy specimens of the lesions revealed angiocentric and angiodestructive infiltration by neoplastic T cells and marked epidermotropism of these cells. These atypical cells immunohistochemically had CD8+ surface phenotype. The patient died of respiratory insufficiency due to acute pulmonary infiltration. Autopsy demonstrated angiocentric and angiodestructive lymphomatous infiltration in the lung.

Aged↗