Laser subepithelial keratomileusis: electron microscopy and visual outcomes of flap photorefractive keratectomy

Laser epithelial keratomileusis (LASEK) is a surgical technique that may be performed in patients with low myopia who are considering conventional photorefractive keratectomy (PRK), in patients with thin corneas, and in patients with professions or lifestyles that predispose them to trauma. Ethanol (18%) is applied for 25 seconds and a hinged epithelial flap is created. After laser ablation, the flap is repositioned over the ablated stroma. Our data showed that epithelial defects occurred in 63% eyes on Day 1. Postoperative pain was absent in 47%. Uncorrected visual acuity of 20/40 or better was achieved in all patients at 1 week. Data from several studies suggest that LASEK may reduce postoperative pain and corneal haze associated with PRK. LASEK offers the potential advantage of avoiding flap-related complications associated with laser in situ keratomileusis and decreasing postoperative pain and corneal scarring associated with PRK. Long-term studies are needed to confirm these potential advantages and to determine the safety, efficacy, and predictability of this surgical technique.

A case of adrenocortical tumor coexisted with paragangliomas

We report a case of adrenocortical tumor that coexisted with paragangliomas. A 35-year-old woman was admitted to the hospital because of left upper abdominal pain. A palm-sized mass was palpated at left upper quadrant. Hormonal studies revealed the features of pheochromocytoma. An emergency operation was performed because hemorrhage of the tumor was suspected. A 10 cm diameter ruptured mass was found in the left adrenal area and other tumors were also noted adjacent to inferior vena cava (IVC). The pathologic report revealed that the adrenal mass was an adrenocortical tumor with hemorrhagic necrosis and that the tumors adjacent to IVC were paragangliomas. This was the first case of adrenocortical tumor with paragangliomas in our Medline search result, hence we report the case with a review of the literature.

Molecular genetic analysis of reovirus isolated in Korea

Reovirus isolates from human, striped-field mouse (Apodemus agrarius) and Korean field mouse (A. peninsulae) in Korea showed extensive variability in the patterns of electrophoretic migration of the double-stranded RNA (dsRNA) genome segments. Hemagglutination inhibition (HI) test was performed for serotype determination of 12 reovirus isolates. To clarify genetic diversity and molecular phylogeny of Korean reoviruses, L1, S3 and S4 genomic segments of reoviruses were amplified by RT-PCR and directly sequenced. Among 12 reovirus strains, 9 strains were type 3 and 3 strains were type 2. The L1 was highly conserved showing 91.5-100%, 94.7-100% similarities among Korean isolates, and 77.5-97.9%, 92.6-96.8% similarities compared to other reference strains of each genotypes at nucleotide and amino acid levels, respectively. In S3 and S4 segments, 84.4-99.3%, 72.3-99% nucleotide sequence similarities and 92-99.3%, 89.1-98.4% amino acid sequence similarities among Korean isolates were observed, and 70.8-93.9%, 72.3-98.7% nucleotide sequence similarities and 81.8-100%, 88.3-97.7% amino acid sequence similarities compared with other reference strains of each genotype were observed, respectively. Phylogenetic analyses based on the S3 and S4 nucleotide sequences indicate that genotypes of reovirus are more related with geographic differences rather than host species or date of isolation.

Acquired pendular nystagmus with voluntary inhibition

This report documents a case of voluntary inhibition of acquired pendular nystagmus after head trauma. A 30-year-old male developed oscillopsia and decreased visual acuity, as well as findings of acquired pendular nystagmus with voluntary inhibition after head trauma. The EOG finding was horizontal 18-20 Hz bilateral symmetrical pendular nystagmus in all directions of gaze at near and distant fixation. Nystagmus did not change with 14 Prism Diopter base-out prisms on both eyes, but it was possible to abolish it intentionally. Baclofen and Clonazepam had no effect in improving the patient's symptoms and EOG finding.

Induction of immune responses to glycoprotein gD of Aujeszky's disease virus with DNA immunization

In an attempt to produce a DNA vaccine to prevent Aujeszky's disease, the induction of immune responses against Aujeszky's disease virus (ADV) gD was investigated in mice. The plasmid was constructed by placing ADV gD gene downstream of murine cytomegalovirus immediate early promoter of expression vector pMYK, which was injected twice on the skin of mice by using a gene-gun. All mice showed neutralizing antibodies against ADV gD at 4 weeks after immunization. The induction of cytotoxic T lymphocytes and splenic natural killer cells was also observed at 6 weeks post immunization. These results indicate that ADV gD gene in the form of DNA vaccine may induce specific as well as non-specific immune responses in vivo.

Hyperthermic Enhancement of the Apoptotic and Antiproliferative Activities of Paclitaxel

The antineoplastic agent paclitaxel (PTX), a microtubule-stabilizing agent, is known to arrest cell cycle progression and induce apoptosis. Mild hyperthermia (HT) also disrupts the microtubule system and triggers apoptosis. We therefore investigated whether concurrent exposure of murine breast cancer cells to 10 micromol/l PTX and 43 degrees C HT will promote improved anticancer effects. To do this, we exposed FM3A murine cancer cells to: (1) 10 micromol/l PTX for 1 h at 37 degrees C followed by exposure at 43 degrees C HT for 1 h; (2) 10 micromol/l PTX at 37 degrees C for 2 h; (3) 37 degrees C for 1 h followed by 43 degrees C HT for 1 h, and (4) untreated cells at 37 degrees C for 2 h which served as the control. Treatment No. 1 resulted in an enhanced cell cycle arrest, apoptosis and cytotoxicity. Exposure to 43 degrees C HT alone or 10 micromol/l PTX alone induced lesser apoptosis and cytotoxicity than the two treatments concurrently applied. The apoptotic cell death occurred in a time-dependent manner as follows: (1) concurrently applied 43 degrees C HT and 10 micromol/l PTX (5.6 +/- 0.5, 16.5 +/- 2 and 27.6 +/- 1%); (2) 43 degrees C HT alone (4.3 +/- 1, 6.6 +/- 0.3 and 12.7 +/- 1%) and (3) 10 micromol/l PTX alone (4.4 +/- 0.3, 8.6 +/- 1 and 12.8 +/- 1%) at 1, 6 and 24 h postexposure respectively compared to control of 2.0%. These data indicate that while both HT and PTX can individually induce apoptosis and antiproliferation in FM3A cancer cells, they may offer synergistic benefits when used concurrently.

Ibuprofen-induced bullous leukocytoclastic vasculitis

A dramatic case of ibuprofen-induced bullous leukocytoclastic vasculitis (LCV) is described in a patient with a history of prior sensitization to ibuprofen, a common household nonsteroidal anti-inflammatory drug (NSAID) that has few reported adverse skin reactions. Bullous LCV is a relatively rare clinical presentation of LCV, which requires differentiation from other blistering diseases, including bullous erythema multiforme, bullous fixed drug eruption, linear IgA bullous dermatosis, and bullous pemphigoid. The distinctive histopathologic changes of leukocytoclastic vasculitis readily distinguish this bullous eruption from the others.

Comparison of laser epithelial keratomileusis and photorefractive keratectomy for low to moderate myopia

PURPOSE

To compare the effectiveness, safety, and stability of laser epithelial keratomileusis (LASEK), a modified photorefractive keratectomy (PRK) technique, with those of conventional PRK for low to moderate myopia.

SETTING

Department of Ophthalmology, Yonsei University School of Medicine, Seoul, Korea.

METHODS

In this prospective study, 27 patients with a manifest refraction of -3.00 to -6.50 diopters were treated and followed for 3 months. In each case, PRK was performed in 1 eye and LASEK in the other eye. The first eye treated and the surgical method used in the first eye were randomized. Postoperative pain, epithelial healing time, uncorrected visual acuity (UCVA), manifest refraction, corneal haze, and surgical preference were examined in PRK- and LASEK-treated eyes.

RESULTS

During the 3 month follow-up, there were no significant between-eye differences in epithelial healing time, UCVA, or refractive error. However, LASEK-treated eyes had lower postoperative pain scores (P =.047) and corneal haze scores (1 month; P =.02) than PRK-treated eyes. Seventeen patients (63%) preferred the LASEK procedure.

CONCLUSIONS

Laser epithelial keratomileusis safely and effectively treated eyes with low to moderate myopia. It reduced the incidence of significant postoperative pain and corneal haze and may prevent the flap- and interface-related problems of laser in situ keratomileusis.

A novel antivirally active fucan sulfate derived from an edible brown alga, Sargassum horneri

A novel fucan sulfate (Hor-1) was isolated from the hot water extract of an edible brown alga, Sargassum horneri (Turner) C. Agardh. The fucan sulfate was revealed to have sugar linkage types, sulfate content and uronic acid content different from those of sodium hornan (Na-HOR), another fucan sulfate isolated from this alga. However, it exhibited inhibitory activity against replication of herpes simplex virus type 1 with similar potency to Na-HOR.

Symmetrically distributed orange eruption on the ears: a case of lupus vulgaris

Although the incidence and morbidity of tuberculosis (TB) have declined in the latter half of the last decade in the United States, the number of cases of TB (especially cutaneous TB) among those born outside of the United States has increased. This discrepancy can be explained, in part, by the fact that cutaneous TB can have a long latency period in those individuals with a high degree of immunity against the organism. In this report, we describe an individual from a region where there is a relatively high prevalence of tuberculosis who developed lupus vulgaris of the ears many years after arrival to the United States.

Effect of botulinum toxin A chemodenervation in sensory strabismus

PURPOSE

To study the effect of botulinum toxin type A chemodenervation in sensory strabismus.

METHODS

Twelve patients with sensory strabismus were treated with an injection of botulinum toxin type A (Botox; Allergan, Irvine, Calif). Botulinum toxin type A was diluted with 0.9% sodium chloride without preservative at a dose that ranged from 1.25-5 U. A Teflon-coated needle electrode was inserted into the medial rectus muscle in cases of esotropia and into the lateral rectus muscle in cases of exotropia. Four patients were treated with > or =2 injections of botulinum toxin type A. Changes in the angle of strabismus and related complications were followed for >6 months postinjection.

RESULTS

The mean deviation before injection was 33.8 prism diopters (delta) and the mean corrective effect on the deviation was 72.8% after injection in patients with sensory strabismus. The final deviation in 9 patients was <10 delta. Complications were hypertropia in 3 (25%) patients and conjunctival hemorrhage in 1 (8.3%) patient.

CONCLUSION

Botulinum toxin type A is likely to prevent muscle contracture and affect muscle and neuronal tissues. This study on the effects of sensory strabismus with botulinum toxin type A injection suggests it has the potential to replace surgery or be used as an adjuvant therapy.

Multicentric reticulohistiocytosis with neurofibroma-like nodules

We describe a patient with multicentric reticulohistiocytosis (MR), who presented with 2 different clinical types of lesions. Some were characteristic for MR in that they were deeply set, small, firm papules. Many others were larger, soft, and even sessile, like neurofibromas. Histopathologic features of both types of lesions revealed MR. To our knowledge, this is the first report of lesions of MR mimicking neurofibromas.

Optimal buffered compression and coding mode selection for MPEG-4 shape coding

We propose an optimal buffered compression algorithm for shape coding as defined in the forthcoming MPEG-4 international standard. The MPEG-4 shape coding scheme consists of two steps: first, distortion is introduced by down and up scaling; then, context-based arithmetic encoding is applied. Since arithmetic coding is "lossless," the down up scaling step is considered as a virtual quantizer. We first formulate the buffer-constrained adaptive quantization problem for shape coding, and then propose an algorithm for the optimal solution under buffer constraints. Previously, the fact that a conversion ratio (CR) of 1/4 makes a coded image irritating to human observers for QCIF size was reported for MPEG-4 shape coding. Therefore, careful consideration for small size images such as QCIF should be given to prevent coded images from being unacceptable. To this end, a low bit rate tuned algorithm is proposed in this paper as well. Experimental results are given using an MPEG-4 shape codec.

Effects of structural modification of calcium spirulan, a sulfated polysaccharide from Spirulina platensis, on antiviral activity

Calcium ion binding with the anionic part of a molecule was replaced with various metal cations and their inhibitory effects on the replication of herpes simplex virus type 1 were evaluated. Replacement of calcium ion with sodium and potassium ions maintained the antiviral activity while divalent and trivalent metal cations reduced the activity. Depolymerization of sodium spirulan with hydrogen peroxide decreased in antiviral activity as its molecular weight decreased.

Determination of the critical pressure drop for filtration of super-compactible cakes

In accord with Darcy's law, the flow rate through a porous bed depends upon the pressure drop deltap(c). In general, increasing deltap(c) leads to increased values of flow rate and average percentage solids in filtration operations. When cakes become super-compactible, their behavior undergoes an unexpected change in which both the flow rate and the percentage solids reach maximum values and thereafter are unaffected by increasing deltap(c). The critical pressure drop deltap(c)R is defined as that value at which the flow rate reaches 90% of its ultimate value. When deltap(c) is greater than deltap(c)R and is doubled or tripled, the cake resistance approximately doubles or triples leaving the rate virtually unchanged. The super-compactibility problem is analyzed theoretically, and is verified by stepped pressure filtration experiments on different materials from Houston and Korea.

A case of porphyria cutanea tarda in association with idiopathic myelofibrosis and CREST syndrome

We report a 56-year-old Korean woman with porphyria cutanea tarda (PCT), showing multiple scarring bullae and hypertrichosis on sun-exposed areas of skin with postinflammatory hyperpigmentation. Sclerodermoid changes were also found on both hands, the face and neck. The patient had suffered from CREST syndrome, manifesting with Raynaud's phenomenon and sclerodactyly, for more than 15 years. Anticentromere antibody was positive. She had presented with splenomegaly 3 years before the development of PCT, and was diagnosed as having idiopathic myelofibrosis, based on bone marrow biopsy. In summary, she had had CREST syndrome for 15 years and later developed idiopathic myelofibrosis and PCT. This is the first reported case of PCT in association with idiopathic myelofibrosis and CREST syndrome.

Combined periodontal-prosthodontic treatment of early-onset periodontitis--an alternative to implant therapy

A variety of treatment systems should be available for patients whose dentitions are seriously compromised so that they may select customized treatment modalities that satisfactorily restore occlusal function, consider systemic conditions, and lessen the surgical and financial burdens. These requirements become more demanding when clinicians are faced with advanced cases of rapidly progressive periodontitis. Therefore, it is critical to establish sophisticated multidisciplinary treatment modalities for the successful management of these compromised patients. Obviously, because of various limitations, implant therapy cannot be the only solution. This article reports on the successful long-term management of seriously compromised early-onset periodontitis by a combined periodontal-prosthetic treatment as an alternative to implant therapy.

Peroxiredoxin is ubiquitously expressed in rat skin: isotype-specific expression in the epidermis and hair follicle

Peroxiredoxins are a family of peroxidases that are ubiquitously and abundantly expressed in mammalian tissues; however, comparatively less is known about their expression in the skin. In this study, we examined the expression of three isotypes of peroxiredoxins (I-III) in rat skin. Western blot analyses showed strong expression of peroxiredoxins I-III in the epidermis and dermis of intact skin. Additionally, they were expressed in cultured rat keratinocytes and fibroblasts. Confocal image analyses revealed that peroxiredoxin II was present in the cytoplasm as a diffuse, reticulated pattern. In immunohistochemical staining of rat skin, peroxiredoxin expression was mainly localized to the epidermis, hair follicles, and sebaceous glands. In the epidermis, peroxiredoxins I and II were expressed in all layers with a gradient of increasing expression to the granular layer. In contrast, peroxiredoxin III was expressed in all layers with a gradient of expression decreasing to the granular layer. In the hair follicle, peroxiredoxins I-III were mainly expressed in the outer root sheath, except peroxiredoxin II, which was strongly expressed in the inner root sheath. In situ hybridization showed that mRNA expression was commensurate with the level of protein. Ultraviolet B radiation increased peroxiredoxin II expression in rat skin within 15 min after irradiation. From this study we conclude that peroxiredoxin isoforms are ubiquitously expressed in rat skin, and expression of at least peroxiredoxin II can be regulated by ultraviolet irradiation as a peroxidase in the skin. J Invest Dermatol 115:1108-1114 2000

Treatment of suprachoroidal hemorrhage with tissue plasminogen activator

We evaluated the efficacy of tissue plasminogen activator in treating experimental suprachoroidal hemorrhage. Suprachoroidal hemorrhage was created in 30 white rabbit eyes by implanting four pieces of small, exogenously formed blood coagula into the suprachoroidal space. Animals were randomized for treatment with a surgical sponge soaked in 25, 50, or 75 microg of tissue plasminogen activator (tPA) or balanced salt solution (BSS) as a control. The time when initiation and completion of clot dissolution occurred was established, and histological examination was performed to assess damage. Clot dissolution started within 30 min in the 50- and 75-microg tPA group, whereas it took 2.75 days in the control group; complete dissolution of blood clots took 4.5 h in the 75-microg tPA group and 14 days in the control group. Histological examination revealed a minimal change in photoreceptors within 6 h after treatment with 75 microg tPA. Treatment of suprachoroidal hemorrhage with tPA seems to be effective, but further investigations for determining the effective and nontoxic dose are required.

Virulent Treponema pallidum 47 kDa antigen regulates the expression of cell adhesion molecules and binding of T-lymphocytes to cultured human dermal microvascular endothelial cells

Perivasculitis and endothelial cell abnormalities are prominent histopathologic features of syphilis. Various cutaneous lesions are the main clinical features of syphilis. We examined whether Treponema pallidum 47 kDa antigen regulates the expression of cell adhesion molecules on human dermal microvascular endothelial cells (HDMEC) and the regulation of T-lymphocytes binding to HDMEC. Using immunofluorescence flow cytometry and enzyme-linked immunosorbent assay (ELISA), we demonstrated that T. pallidum upregulated the expression of adhesion molecules, including intercellular adhesion molecule 1 (ICAM-1), vascular cell adhesion molecule 1 (VCAM-1) and E-selectin. The 47 kDa antigen of T. pallidum also activated endothelium as measured by the upregulation of the expression of adhesion molecules on HDMEC, and it also promoted an increased adherence of T-lymphocytes to HDMEC. The expressions of ICAM-1 and VCAM-1 on HDMEC and the adherence of T-lymphocytes to HDMEC were inhibited by treatment with anti-TNF-alpha antibody or anti-IL-1alpha antibody. These results show that T. pallidum or T. pallidum-specific 47 kDa antigen are capable of stimulating HDMEC to increase the expression of ICAM-1, VCAM-1 and E-selectin and thereby, promote the adherence of T-lymphocytes. The whole process may play an important role in the immunopathogenesis of syphilis and it is likely that TNF-alpha and IL-1alpha are involved.

Comparison of tear secretion and tear film instability after photorefractive keratectomy and laser in situ keratomileusis

PURPOSE

To evaluate and compare tear secretion and tear film instability following photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK).

SETTING

Department of Ophthalmology, Yonsei University School of Medicine, Seoul, Korea.

METHODS

In a prospective study, 36 eyes (21 patients) had PRK and 39 eyes (25 patients) had LASIK to correct myopia. Tear secretion and tear film instability were tested preoperatively and 3 and 6 months postoperatively using Schirmer test values, tear breakup time (BUT) scores, and tear osmolarity.

RESULTS

Six months after surgery, the change in Schirmer test values from preoperative levels was -14.57% +/- 6.39% (SD) in the PRK eyes and -23.40% +/- 5.94% in the LASIK eyes and the change in BUT scores, -12.54% +/- 8.28% and -18.79% +/- 13.01%, respectively. The change in tear osmolarity was 14.95% +/- 6.46% and 35.63% +/- 8.51%, respectively.

CONCLUSIONS

The decrease in tear secretion was greater after LASIK than after PRK at 6 months. Proper treatment of dry eye is required after LASIK and PRK, particularly in the LASIK postoperative period.

Impact simulation on pre-formed prosthesis for large cranial defect

Cranioplasty greater than 10 cm2 in size is challenging task for neurosurgeon. There are many successful trials to fill the small defect with various materials. Proper cranioplasty can provide subsequently restoration of cerebral protection, cosmetic aspect and neuronal function. However, larger defect may not provide adequate protection from the auto, industrial or sport accident even with cranioplasty. In this study, patch design using two popular materials was evaluated and compared with bone material. Then impact-releasing holes were implemented to the patch. The movement of the large patch and its effect on the underlying brain tissue upon simulated impact was evaluated by using finite element analysis.

Treatment of Bowen's disease with a specially designed radioactive skin patch

Bowen's disease can be treated by various methods, including surgical excision, cryosurgery, laser ablation, curettage, Mohs' microsurgery and ionizing radiation. Radiotherapy has been a useful therapeutic modality in the treatment of Bowen's disease and other skin cancers in areas which are difficult to excise, especially the central areas of the face, including eyelids, nose and lips. To overcome some of the disadvantages of external radiotherapy, a specially designed skin patch coated with high-energy beta-emitter holmium-166 was made for topical application at our institute. Twenty-nine sites of Bowen's disease in eight patients, confirmed by skin biopsy, were treated with 166Ho patches. The patches were applied to the surface of skin cancers for 30-60 min for a total radiation dose of 35 Gy (3500 rads). One to two weeks after application of the 166Ho patch, desquamation, erythema or erosion developed in treated sites, but these acute radiation reactions healed gradually with epithelial regeneration, and they showed good functional and cosmetic results without any complications. Follow-up biopsies were performed 1-5 months after 166Ho patch therapy, and they did not show any signs of Bowen's disease. One to two years after treatment with 166Ho skin patches, there were no recurrences of Bowen's diseases and no late complications. The 166Ho patch is an effective and convenient alternative method for the treatment of Bowen's disease that yields good cosmetic and functional results.

Ocular deviation after unilateral laser in situ keratomileusis

Laser keratomileusis and excimer laser photorefractive keratectomy in situ are widely used therapies for treating myopia. The corrections of refractive error by glasses or contact lens result in a relatively equal refractive correction on both eyes. However, refractive surgery on a single eye can cause a focus disparity between both eyes and may result in the impairment of fusion leading to strabismus. This article aims to report a case where diplopia and esotropia occurred 1 month after laser keratomileusis (LASIK) in situ for the correction of myopia.

Modified Kestenbaum surgery for correction of abnormal head posture in infantile nystagmus: outcome in 63 patients with graded augmentaton

PURPOSE

To analyze the surgical effect of modified Kestenbaum surgery and show how to determine the amount of appropriate augmentation for correction of abnormal head posture in infantile nystagmus.

METHODS

We reviewed the records of 63 patients with infantile nystagmus who required surgery for a significant face turn and who were followed for at least five months after surgery. Group 1, consisting of 29 patients, received Parks' modification of the standard Kestenbaum procedure (the 5-6-7-8 mm procedure); Group 2, 32 patients, received a 20% augmentation of the original Parks recommendation; and Group 3, 2 patients, received a 30% augmentation of the original Parks procedure. Pre-and postoperative measurements with electro-oculography (EOG) using Nicolet Compact Four/CA 2000 were made.

RESULTS

The average preoperative face turn in the 63 patients with horizontal nystagmus was 31.9 degrees with an average postoperative face turn of 5.2 degrees. The average net change in face turn was 26.7 degrees. The average duration of time from surgery to final examination was thirteen months. Fifty-six out of 63 patients (89%) achieved a straight head position or a residual face turn of 10 degrees or less.

CONCLUSION

A Parks' modified Kestenbaum procedure, with appropriate graded augmentation up to 30% is effective for the correction of abnormal head posture in infantile nystagmus without the need for larger augmentations.

Activation of heparin cofactor II by calcium spirulan

Heparin cofactor II (HCII) is a plasma serine protease inhibitor whose ability to inhibit alpha-thrombin is accelerated by a variety of sulfated polysaccharides in addition to heparin and dermatan sulfate. Previous investigations have indicated that calcium spirulan (Ca-SP), a novel sulfated polysaccharide, enhanced the rate of inhibition of alpha-thrombin by HCII. In this study, we investigated the mechanism of the activation of HCII by Ca-SP. Interestingly, in the presence of Ca-SP, an N-terminal deletion mutant of HCII (rHCII-Delta74) inhibited alpha-thrombin, as native recombinant HCII (native rHCII) did. The second-order rate constant for the inhibition of alpha-thrombin by rHCII-Delta74 was 2.0 x 10(8) M(-1) min(-1) in the presence of 50 microgram/ml Ca-SP and 10, 000-fold higher than in the absence of Ca-SP. The rates of native rHCII and rHCII-Delta74 for the inhibition of gamma-thrombin were increased only 80- and 120-fold, respectively. Our results suggested that the anion-binding exosite I of alpha-thrombin was essential for the rapid inhibition reaction by HCII in the presence of Ca-SP and that the N-terminal acidic domain of HCII was not required. Therefore, we proposed a mechanism by which HCII was activated allosterically by Ca-SP and could interact with the anion-binding exosite I of thrombin not through the N-terminal acidic domain of HCII. The Arg(103) --> Leu mutant bound to Ca-SP-Toyopearl with normal affinity and inhibited alpha-thrombin in a manner similar to native rHCII. These results indicate that Arg(103) in HCII molecule is not critical for the interaction with Ca-SP.

Androgen receptor gene mutation identified by PCR-SSCP and sequencing in 4 patients with complete androgen insensitivity syndrome

To study the genetic defect of the human androgen receptor (hAR) gene in the complete androgen insensitivity syndrome (CAIS), we amplified each of the eight exons by PCR in genomic DNA extracted from the paraffin blocks of the resected gonads. We analyzed using SSCP, and directly sequenced the abnormally shifted bands. Mutations were found in 4 cases of CAIS. Patient 1 carried a point mutation; a G to A transition in exon 7 resulted in a change from arginine to glutamine at codon 831. Patient 2 carried a point mutation; a C to T transition in exon 7 resulted in a change from arginine to stop at codon 831. Patient 3 carried a point mutation and deletion in exon 7. A point mutation was an A to G transition that caused a glutamine to be substituted for the asparagine present at codon 819. A deletion of a G at codon 820 resulted in a frameshift and consequently in the introduction of a premature stop at codon 821. Patient 4 carried a mutation in 5' splice donor site of intron 7; a G to T transition might have caused an abnormal splicing of the exon 7. All of the mutations were found in exon 7. These mutations of hAR gene might be related to the pathogenesis of CAIS.

Evaluation of 11C-colchicine for PET imaging of multiple drug resistance

Overexpression of P-glycoprotein (P-gp) can confer multiple drug resistance (MDR) phenotype on cancer cells and tumors by reducing intracellular accumulation of various cytotoxic agents. Early diagnosis of MDR in the clinic will serve to improve the efficacy of chemotherapeutic intervention and the quality of life of patients. In this article we describe use of a positron-emitting MDR tracer, 11C-colchicine (CHC), to evaluate MDR by PET imaging. Unlike existing MDR tracers such as 99mTc-sestamibi, this compound is electroneutral, with biodistribution not affected by perturbations of membrane potential.

METHODS

In vitro studies showed that resistance to CHC is correlated to resistance to Taxol (paclitaxel). The results of biodistribution experiments were found to be consistent with previously reported experiments with CHC labeled with other isotopes. On the basis of in vitro experiments with a series of drug-resistant variants of the human neuroblastoma BE (2)-C cell line, a mathematic model of 11C-CHC distribution in tumors was formulated. Dynamic PET 11C-CHC imaging experiments were performed with nude rats xenografted with the BE (2)-C-sensitive and -resistant strains. Each scan was accompanied by a transmissions scan and a static FDG scan. These scans allowed improved image localization.

RESULTS

We observed an approximately 2-fold difference between 11C-CHC accumulation in sensitive and resistant tumors. Imaging data were analyzed using the mathematic model, and various parameters characterizing resistance could be identified and estimated. In particular, the parameter r, proportional to the level of resistance of the tumors, was obtained. We showed that the ratio of these r parameters determined from the sensitive and resistant tumors was identical to the ratio of CHC accumulation in the corresponding sensitive and resistant cell lines used for xenografting.

CONCLUSION

These in vivo experiments provided additional evidence for the indirect effect of P-gp action on CHC-to-tubulin binding, which in turn determines CHC uptake in tumors. The significance of these findings and future plans is discussed.

A case of congenital inverse Duane's retraction syndrome

Inverse Duane's retraction syndrome is very uncommon. Congenital cases are even more unusual. A 6-year-old girl with convergent squint along with severe restriction on abduction is described. On attempted abduction, a narrowing of the palpebral fissure, upshoot and retraction of the eyeball were observed. Brain and orbit MRI demonstrated no intracranial or intraorbital mass, fracture, or entrapment of the medial rectus. Forced duction test was strongly positive. The primary lesion was found to be a tight medial rectus with shortening and soft tissue contracture. Surgical tenotomy of the medial rectus led to successful postoperative motility, but some limitation at full adduction and abduction persisted. This is a case reported with congenital medial rectus shortening, suggesting that this condition may be one of the etiologies of the rare inverse Duane's retraction syndrome.

Structural analysis of calcium spirulan (Ca-SP)-derived oligosaccharides using electrospray ionization mass spectrometry

Detailed structural analyses of calcium spirulan (Ca-SP)-derived oligosaccharides were performed by ESI-MS and collision-induced dissociation tandem mass spectrometry. This study indicates that Ca-SP is composed of two types of disaccharide repeating units, O-rhamnosyl-acofriose and O-hexuronosyl-rhamnose (aldobiuronic acid).

Neuro-Behcet's disease presenting with isolated unilateral lateral rectus muscle palsy

The authors present the clinical findings of a 30-year-old female and a 29-year-old male who both had isolated unilateral lateral rectus muscle palsy in neuro-Behcet's disease. The clinical feature related to isolated abduscens nerve palsy was identified by CT, systemic assessment and extraocular examination. These patients' constellation of findings appear to be unique: it does not follow any previously reported pattern of ocular manifestations of neuro-Behcet's disease.

Antiviral activities against HSV-1, HCMV, and HIV-1 of rhamnan sulfate from Monostroma latissimum

Rhamnan sulfate (RS), a natural sulfated polysaccharide isolated from Monostroma latissimum, showed potent inhibitory effects on the virus replication of herpes simplex virus type 1 (HSV-1), human cytomegalovirus (HCMV), and human immunodeficiency virus type 1 (HIV-1) in vitro. The antiviral action of RS was not only due to the inhibition of virus adsorption, but also might involve the later steps of viral replication in host cells on the basis of the results of time-of-addition experiments. Furthermore, RS and 3'-azido-3'-deoxythymidine (AZT) were synergistic in their anti-HIV-1 activities. These data indicate that RS is a potent antiviral substance against HSV-1, HCMV, and HIV-1.

Expression of differentiation markers during fetal skin development in humans: immunohistochemical studies on the precursor proteins forming the cornified cell envelope

The cornified cell envelope is formed during the terminal differentiation of epidermis through cross-linking of specific proteins by transglutaminases. The specific arrangement of individual protein in the cornified cell envelope and participation of individual protein in the cornified cell envelope at different regions of skin, i.e., palm, foreskin, lips, etc. are not clearly understood. In order to understand the pattern and expression schedule of each individual precursor protein during the differentiation and formation of cornified cell envelope, the expression of precursor proteins in developing human fetal skins from the first to the third trimester were examined by immunohistochemical studies. Involucrin was found in the periderm and intermediate layer from 14 wk estimated gestational age, while loricrin and small proline-rich protein 1 were found in the periderm from 16 wk estimated gestational age. Filaggrin and trichohyalin that are absent in the adult cornified cell envelope were found in the granular and horny layers from 24 wk estimated gestational age. The precursor proteins except trichohyalin did not change their patterns after the onset of initial expression during development. Trichohyalin was transiently expressed in the granular and horny layers of the epidermis from 24 wk estimated gestational age with peak expression at 27 wk estimated gestational age, but was not detected in adult skin. In hair follicles, trichohyalin expression was stable without change from 20 wk estimated gestational age. These findings suggest that fetal skin may have different sets of barriers from the second trimester; the immature cornified cell envelope is formed in the early second trimester and the mature cornified cell envelope is formed in the late second or early third trimester when filaggrin and trichohyalin appear.

A case of cutaneous extramedullary hematopoiesis in myelofibrosis with a preponderance of eosinophilic precursor cells

A 48-year-old Korean man with myelofibrosis had erythematous papules and nodules on his scalp, anterior chest, back, lower abdomen, and both thighs. Skin biopsy showed cellular infiltration on the perivascular dermis and subcutaneous fat. Infiltrates were composed mainly of myeloid cells, especially of eosinophilic precursor cells. Erythroid and a few megakaryocytic precursors were also found. We diagnosed cutaneous extramedullary hematopoiesis with an interesting preponderance of eosinophilic precursor cells.

Analysis of the factors affecting decentration in photorefractive keratectomy and laser in situ keratomileusis for myopia

To evaluate the relationship between ablation zone decentration measured by corneal topography and various factors such as sex, age, order of operation, preoperative sedative prescription, ablation diameter and depth, type of procedure (photorefractive keratectomy = PRK, laser in situ keratomileusis = LASIK), and the use of a passive eye tracker, we examined the data of 80 eyes in 50 patients. The patients received PRK (43 eyes in 30 patients) or LASIK (37 eyes in 20 patients), and were followed for 3 months postoperatively. Statistical analysis of the data was performed using t-test, ANOVA and multiple regression analysis. The overall average ablation decentration from the pupil center was 0.43 +/- 0.27 mm, 0.35 +/- 0.22 mm in PRK and 0.47 +/- 0.30 mm in LASIK. Overall 91.3% of patients were decentered less than 0.75 mm and 95.0% were decentered less than 1.00 mm, while 93.9% of patients were decentered less than 0.75 mm in PRK and 88.7% were decentered less than 0.75 mm in LASIK. The most meridional displacement was toward the superonasal quadrant; 46% in PRK and 51% in LASIK. There was less decentration in males, in the 2nd-operated eye, in older age, PRK, in larger ablation diameter, and in shallower ablation depth, but these differences were not statistically significant.

Expression of trichohyalin in dermatological disorders: a comparative study with involucrin and filaggrin by immunohistochemical staining

To investigate the function of trichohyalin during terminal differentiation of the skin, immunohistochemical studies were performed on trichohyalin and its related proteins, filaggrin and involucrin, the components of the cornified cell envelope. In skin disorders unrelated to tumours, weak trichohyalin expression was found in a few granular cells or in the horny layer of psoriasis, ichthyosis, keratosis pilaris, porokeratosis, chronic dermatitis and callus. Similar trichohyalin expression was found in epidermal tumours, such as seborrheic keratosis, actinic keratosis, Bowen's disease and well-differentiated squamous cell carcinoma. In follicular tumours, trichohyalin expression was positive in trichoepithelioma, keratotic basal cell epithelioma, proliferating trichilemmal tumour, trichilemmoma, pilomatricoma and keratoacanthoma. From comparative studies with filaggrin and involucrin, trichohyalin expression was co-localized with them in molluscum contagiosum, keratoacanthoma and pilomatricoma. From this study, trichohyalin is revealed to have close functional relationship with other markers of terminal differentiation as a precursor of the cornified cell envelope of the skin.

Percutaneously implantable catheter-port system for chemotherapeutic infusion through the hepatic artery

OBJECTIVE

The goal of this study was to determine the feasibility and outcomes of percutaneously implantable catheter-port system placement in the hepatic artery for the purpose of intraarterial chemotherapeutic infusion.

CONCLUSION

Percutaneously implantable catheter-port system placement is safe and technically feasible for use in the hepatic artery. The implantation procedure is less invasive than surgical implantation of similar port systems.

Anatomical and neurochemical peculiarities of the pika retina: basis for lack of circadian rhythm of core temperature

We have previously reported a complete lack of circadian rhythm in the body temperature of pikas in contrast to other lagomorphs. In this present study, the anatomical and neurochemical findings by immunohistochemical, photo and electron microscopic methods reveal that the photoreceptor system of this animal is poorly developed. This probably explains their stable core body temperature which help them survive in cold temperatures.

Coactivation of the flexor muscles as a synergist with the extensors during ballistic finger extension movement in trained kendo and karate athletes

To analyse the effects of ballistic property training on ballistic finger extension movement, surface electromyographic pattern (EMGs) of the finger extensor and flexor muscles and the acceleration signal of the middle finger were recorded in trained kendo and karate athletes, and sedentary non-athletic men. Ballistic finger extension did not show the characteristic triphasic EMG pattern reported in single joint, but a coactivation of flexor and extensor muscles. Reaction time (RT) in kendo (143 +/- 12 msec) and karate (146 +/- 11 msec) athletes were significantly shorter than that in the control (176 +/- 12 msec). The shortenings of the RT were attributed to both the shortenings of premotor time and motor time. The delay of the flexor muscles discharge after those of the extensors in kendo (0.8 +/- 7.0 msec) and karate (-0.2 +/- 5.0 msec) athletes was significantly shorter than in control (12.7 +/-5.6 msec). These results suggest that the RT is shortened through motor learning in the kendo and karate athletes who trained for momentary movements; and that the flexor muscles may play an important role as a synergist in heightening the efficiency of ballistic finger extension in coordination with the extensor muscles.

Nucleotide sequence and transcription map of porcine adenovirus type 3

The complete nucleotide sequence of porcine adenovirus type 3 was determined and a transcriptional map for the genome was constructed. The size of the genome is 34094 bp in length with an unusually high G + C content (63.7%), the highest thus far reported for any adenovirus. Overall organization of the genome is similar to that for previously sequenced adenoviral DNAs, but there also were distinct differences. The late regions genes are organized into six families, instead of five as they are in human adenovirus type 2. In contrast to bovine adenovirus type 3 and ovine adenovirus, which lack virion-associated RNA genes, the nucleotide sequence analysis of the viral genome indicates that it encodes one short VA RNA species. With the exception of the fiber and a 33-kDa nonstructural protein, the predicted amino acid sequences of the open reading frames in the late regions and the E2 region and IVa2 exhibited a high level of homology, whereas the deduced amino acid sequences of ORFs in E1, E3, and E4 regions, and the pIX showed a lesser homology with the corresponding proteins of other adenoviruses. The proteins V, VII, and IX are unusually long, and the protein VII lacks the consensus protease cleavage site. Genomic and cDNA sequence analysis has identified promoters, cap sites, intron-exon boundaries, polyadenylation signals, and polyadenylation sites in the viral genome.

Sequence and transcription map analysis of early region-1 of porcine adenovirus type-3

The nucleotide sequence of a region of the genome of porcine adenovirus-3 (PAV-3) between map units 1 and 12.2 was determined. The sequenced region included four major open reading frames, and several transcription control elements. Homology studies, using the deduced amino acid sequences of the open reading frames, revealed genes coding for the E1A, E1B 202R, E1B 474R and pIX proteins. The region was characterized by Northern blot analysis and sequencing of cDNA clones. In PAV-3, the E1A region is located between 1.5 and 3.8 map units. Alternate splice donor sites are used to produce four different types of transcripts from the primary transcript of the E1A region. The E1A proteins of PAV-3 contain a consensus zinc finger motif, which was shown to be the principal transactivation region of human adenovirus-5 (HAV-5) E1A proteins. The PAV-3 E1A proteins also contain a retinoblastoma susceptibility protein (pRb) binding motif, which in HAVs interacts with cellular Rb protein to overcome the pRb mediated transcription repression. The E1B region in PAV-3 maps between 4.0 and 12.2 map units, and shares a polyadenylation signal and polyadenylation sites with the gene coding for pIX. A single major and a number of minor mRNA species are produced from the E1B region. The open reading frame (ORF) analysis of cDNA representing major mRNA produced from the E1B region showed two overlapping ORFs corresponding to 19K and 55K ORFs of HAV-2. In PAV-3, the gene coding for pIX is located between 9.9 and 12.2 map units and codes for a protein of 199 amino acids.

Disfiguring cutaneous manifestation of sarcoidosis treated with thalidomide: a case report

A patient with sarcoidosis was treated with thalidomide for disfiguring and painful steroid unresponsive sarcoidal granulomas of the skin. The duration of the therapy was 14 months, during which time, the skin lesions resolved almost completely. The initial dosage was 200 mg a day, which was increased to 400 mg a day after 4 months. Episodic paresthesia of the finger tips and one lower extremity was the only side effect noted, which resolved promptly after discontinuation of the drug. The dramatic response of sarcoidal granulomas of the skin to thalidomide observed in this patient demonstrates the usefulness of this drug as a possible long-term monotherapeutic or steroid-sparing agent in the treatment of sarcoidosis.