Melanogenesis, or synthesis of melanin has been a focus of intense investigation by pigment cell biologists during the past few decades. Melanogenesis provides pigment in skin, thus serving as a unique, if not only, physiological defense against sun-induced injuries, including photocarcinogenesis. Moreover, skin color plays a major role in visual esthetics of an individual. Therefore, unwanted hyper- or hypo-pigmentation, especially on facial skin, could cause significant psychological stress. Epidermal melanocytes, derived from neural crest cells, are mainly responsible for melanin in skin. In human skin, nearly all normal pigmentation is due to melanin and with the exception of hemoglobin, it is one of the only endogenously synthesized pigments in man. Melanin has numerous functions in mammals, including increasing the optical efficiency of the eye, producing color patterns in various organs, including hair or skin, serving as camouflage, heat exchange, sexual recognition and protection from sunlight. The incidences of malignant melanoma have been increasing dramatically in western countries, at least by a factor of 15 over the past 60 years, and this has caused an intense interest in understanding melanogenesis. More than 40,000 new cases of malignant melanoma have been diagnosed in 1997, and it is one of the most common cancers in young adults. The research in the area of melanogenesis has exploded during the last ten years because model systems to study molecular mechanisms regulating melanogenesis have become available. This review examines currently available in vitro and in vivo model systems to study melanogenesis.
Esthetics ; Hair ; Hot Temperature ; Humans ; Incidence ; Mammals ; Melanins ; Melanocytes ; Melanoma ; Neural Crest ; Pigmentation ; Skin ; Stress, Psychological ; Young Adult

LASIK is an effective and exact procedure to correct myopic refractive error but fatal complication may be happened during making corneal flap using microkeratome. We report a patient who developed acute central stomal melting following LASIK on postoperative day 4. This complication was treated by lifting the flap and scraping the interface of corneal flap & central stroma with a metal blade. After 4 months, overcorrected hyperopic refractive error was retreated with excimer laser ablation and patient recovered successful visual acuity. The pathogenesis of this case is not completely understood. Corneal endothelium and central cornea stroma may be mechanically damaged due to excessive suction ring application during LASIK procedure. Interface epithelial ingrowth may be associated with early postoperative inflammation and infection of corneal flap may produce proteinase which melts corneal flap. If corneal flap melting happens after LASIK procedure, early surgical debridement of melting stroma and proper reattachment of the flap may be needed.
Cornea ; Debridement ; Endothelium, Corneal ; Freezing* ; Humans ; Inflammation ; Keratomileusis, Laser In Situ* ; Lasers, Excimer ; Lifting ; Refractive Errors ; Suction ; Visual Acuity

PURPOSE: The purpose of this study is to investigate the clinical manifestations and antibiotic resistance of salmonellosis in children. METHODS: We reviewed medical records and investigated the clinical characteristics of culture-proven childhood salmonellosis from January 2000 through December 2011 at the CHA Bundang Medical center. RESULTS: We assessed 53 patients. The median age was 3-years-old (minimum 12 days, maximum 18-years-old) and the number of male patients was 33 (62.3%). It occurred most frequently in the summer (39%) and in 2001 (11 cases) however there was no case in 2009 and 2010. Salmonella typhi was isolated in 3 cases with septicemia. Antibiotic resistance to ampicillin was most frequently presented (30.2%) and 63.6% in serogroup B. No antibiotics resistance strains were cultured in patients with positive Salmonella typhi. Admitted patients from 2000 to 2011 were divided into 2 groups; group 1 from 2000 to 2005 and group 2 from 2006 to 2011. 40 cases belonged to group 1 and 13 cases were in the group 2. Group 2 showed more resistance to ampicillin than group 1 but without any statistical significance(25% vs. 38.5%, P=0.349). In group 1, the most common serotype was group D and in group 2, the most common serotype were group C and D. CONCLUSION: Salmonellosis in children was frequently occurred from 2000 to 2003 but decreased after 2004. There was no difference in clinical manifestations, serotypes and antibiotic resistances between the years.
Ampicillin ; Anti-Bacterial Agents ; Child ; Drug Resistance, Microbial ; Humans ; Male ; Medical Records ; Salmonella Infections ; Salmonella typhi ; Sepsis

BACKGROUND: This study was performed to assess the effect of hormone replacement therapy (HRT) on the menopausal symptoms of Korean women by comparing the postmenopausal symptoms before and after HRT in women who continued therapy and those who stopped. METHODS: The subjects were 40 menopausal women(24 women on continuous medication, 16 women who discontinued medication) who received HRT and were alde follow of at least 2 months later in the Department of Family Practice. The menopausal symptoms were evaluated by two doctors according to the modified Kupperman Index. RESULTS: The basic values of Kupperman Index were not significantly different between women who had received the HRT continuously and those who discontinued HRT. In women with continued HRT improved symptoms after HRT were hot flushes, sweating, fatigue, headache, tachycardia and total score of Kupperman Index. However, only vertigo and headache were improved in women who discontinued HRT. Treatment period was the single most predictor of total score of Kupperman Index after therapy. And it could explain the 44.1% of variance of total score in the direction of improvement proportional to the treatment period. CONCLUSIONS: The HRT is helpful to relieve the menopausal symptoms. And the treatment period is more important than the severity of basic symptoms to improve menopausal symptoms after therapy.
Family Practice ; Fatigue ; Female ; Headache ; Hormone Replacement Therapy* ; Humans ; Sweat ; Sweating ; Tachycardia ; Vertigo

PURPOSE: This study aimed to explore how prevalent the community-related methicillin-resistant Staphylococcus aureus (CA-MRSA) was in children with muscular-skeletal infections. METHODS: We retrospectively reviewed the medical records of patients of 18 years or under who were diagnosed with suppurative arthritis or osteomyelitis and S. aureus from September 2000 through August 2012 at the CHA Bundang Medical center. RESULTS: Thirty-one cases of suppurative arthritis or osteomyelitis were identified. The patients were between 17 days old and 18 years old with an average age of 7. Eleven cases (33.5%) of suppurative arthritis and 16 cases (51.6%) of osteomyelitis were observed. Five cases were accompanied by the two diseases. Methicillin sensitive S. aureus (MSSA) was isolated in 25 cases (80.6%) and methicillin resistant S. aureus (MRSA) was isolated in 6 cases (19.4%). Multidrug resistant strains were not observed. MRSA was not found from 2000 through 2005. All patients were treated with antibiotics and the duration of antibiotics treatment was 26.4+/-12.7 days. Vancomycin was used as the initial antibiotic treatment in 4 cases (12.9%) and vancomycin was used as the definitive antibiotics in the 10 cases (32.3%). CONCLUSIONS: The result of this study showed that methicillin resistance rate of S. aureus from muscular-skeletal infections was concentrated in the latter half of the 12 year period.
Anti-Bacterial Agents ; Arthritis, Infectious ; Child ; Humans ; Medical Records ; Methicillin ; Methicillin Resistance ; Methicillin-Resistant Staphylococcus aureus ; Osteomyelitis ; Retrospective Studies ; Vancomycin

No abstract available.
Appendicitis* ; Child* ; Humans

Septic arthritis in neonates is a rare condition. A failure to make an early diagnosis of septic arthritis in neonates may leave a permanent disability as a result of a delayed treatment. Thus, septic arthritis, requires a prompt diagnosis and a timely treatment especially in this subset of patients. In this case report, we describe our treatment protocol for septic arthritis and concurrent osteomyelitis in the right shoulder of a 28-day-old newborn. Using 2.4 mm wrist arthroscopy, we performed an arthroscopic irrigation and drainage, to remove intra-articular debris and inflammatory tissue, and multiple drilling. We report a satisfactory clinical outcome without any postoperative complications or side effects.
Arthritis, Infectious* ; Arthroscopy ; Clinical Protocols ; Diagnosis ; Drainage ; Early Diagnosis ; Humans ; Infant, Newborn* ; Osteomyelitis ; Postoperative Complications ; Shoulder Joint ; Shoulder* ; Wrist

OBJECTIVE: To examine a normal range for nuchal translucency thickness between 9 and 14 weeks' gestation in normal fetuses. METHODS: Nuchal translucency was measured prospectively in 124 fetuses between 9 and 14 weeks' gestation resulted in normal pregnancy outcome. The nuchal translucency measurement was expressed as the median and the 5th, 25th, 75th, and 95th percentiles according to complete weeks of gestation based on ultrasound measurement. RESULTS: The median nuchal translucency thickness was 1.8 mm at 9 weeks' gestation and it declined to 1.6 mm at 10 weeks. But the median thickness increased from 1.95 mm at 11 weeks to 2.3 mm at 12 weeks, after which it slightly declined to 2.25 mm at 13 weeks. And then it increased to 2.5 mm at 14 weeks. A nuchal translucency thickness greater than 2.5 mm was not found at 9 and 10 weeks' gestation, but found in 21.8% of fetuses from 11 weeks to 14 weeks. CONCLUSION: In normal fetuses, there is a physiologic variation in the thickness of nuchal translucency between 9 and 14 weeks' gestation. The calculation of risk for trisomies based on this thickness should take this variation into account. The adoption of a gestational age-dependent cutoff point, based on the deviation of a given measurement from the median, may reduce the invasive procedure for karyotyping. And this study suggest that if the nuchal translucency measurement is greater than 2.5 mm before 10 weeks, it may advise the karyotyping.
Female ; Fetus* ; Karyotyping ; Nuchal Translucency Measurement* ; Pregnancy ; Pregnancy Outcome ; Prospective Studies ; Reference Values ; Trisomy ; Ultrasonography

No abstract available.
Child* ; Humans ; Roxithromycin* ; Scrub Typhus*

BACKGROUND: It is known that obesity is related to hypertension, hyperlipidemia and diabetes mellitus. The results of study done in Korea are widely spread. In this study, we evaluated the prevalence of obesity by four obesity measure methods and the risk of obesity for obesity related diseases. METHODS: This study was done for the period from May 1 to August 31, 1995 in three health care centers run by middle sized hospitals in Pusan. The total number of sampled population was 654(men 227, women 427) RESULTS: We compared obesity by sex and age according to four obesity measure methods. The results were as following . Obesity was more prevailed in women than in men for all measure methods. In women, there was significant difference according to age by Brocas Index(P =0.006), Kassura's modified formula(P=0.018) and Suh's formula(P=0.009) but in men there was no significant difference. We cornpared the laboratory test results of men and women. The test results elevated significantly in men were diastolic blood pressure(P=0.001), hemoglobin(P<0.001), aspartate aminotransferase(AST)(P=0.034), alanine aminotransferase(ALT)(P=0.011), gamma-glutamyltranspeptidase(rGT)(P<0.001). Total cholesterol was elevated significantly in women. We evaluated the correlation of age and obesity with the tests. For the age, systolic blood pressure(P<0.001), diastolic blood pressure(P=0.001), total cholesterol(P<0.001), glucose(P=0.038), AST(P<0.001) were correlated positively. For the obesity, systolic blood pressure(P<0.001), diastolic blood pressure(P<0.001), total cholesterol(P<0.001), glucose(P= 0.045), ALT(P=0.003) were correlated positively. The odds ratio of obesity for elevated blood pressure was 1.03(P=0.005), for hypercholesterolemia 1.03(P=0.001), for elevated ALT 1.03(P =0.005) for hyperglycemia 1.01(P=0.083). CONCLUSIONS: In this study, we found that the prevalence of obesity is higher in women than in men at 40 years old and beyond. We found that obesity is independent risk factor of elevated blood pressure, hypercholesterolemia and elevated ALT. We suggest that the clinicians be concerned in dealing with obesity.
Adult* ; Alanine ; Aspartic Acid ; Blood Pressure ; Busan ; Cholesterol ; Delivery of Health Care ; Diabetes Mellitus ; Female ; Humans ; Hypercholesterolemia ; Hyperglycemia ; Hyperlipidemias ; Hypertension ; Korea ; Male ; Obesity* ; Odds Ratio ; Prevalence ; Risk Factors