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자연 치유된 원발성 피부 Alternariosis 2예
정예리,장성남,한승경,조흔정,서순봉,이광훈 대한의진균학회 1999 대한의진균학회지 Vol.4 No.2
The treatment of cutaneous altemariosis consists of surgical excision and systemic antifungal agent. However, only reduction or cessation of corticosteroids and immunosuppressive therapy, if it is possible, can be sufficient to treat the lesion in some cases. We present two cases of spontaneously healed primary cutaneous altemariosis. Case 1 was a 73-year-old female patient with diabetes mellitus, heart failure, chronic renal failure and chronic hepatitis. Case 2 was a 64-year-old male patient with iatrogenic Cushing's syndrome and diabetes mellitus. The correction of the underlying diseases resulted in improvement of the primary cutaneous altemariosis. [Kor J Med Mycol 4(2): 137-142]
α-티타늄 평판표면에서 강체 구형팁의 스크래치로 인한내부 결정구조 특성 변화에 대한 연구
정예리,김진호,이태일 한국트라이볼로지학회 2023 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.39 No.5
Titanium alloys are widely recognized among engineering materials owing to their impressive mechanical properties, including high strength-to-weight ratios, fracture toughness, resistance to fatigue, and corrosion resistance. Consequently, applications involving titanium alloys are more susceptible to damage from unforeseen events, such as scratches. Nevertheless, the impact of microscopic damage remains an area that requires further investigation. This study delves into the microscopic wear behavior of α-titanium crystal structures when subjected to linear scratch-induced damage conditions, utilizing molecular dynamics simulations as the primary methodology. The configuration of crystal lattice structures plays a crucial role in influencing material properties such as slip, which pertains to the movement of dislocations within the crystal structure. The molecular dynamics technique surpasses the constraints of observing microscopic phenomena over brief intervals, such as sub-nano- or pico-second intervals. First, we demonstrate the localized transformation of lattice structures at the end of initialization, indentation, and wear processes. In addition, we obtain the exerted force on a rigid sphere during scratching under linear movement. Furthermore, we investigate the effect of the relaxation period between indentation and scratch deformation. Finally, we conduct a comparison study of nanoindentation between crystal and amorphous Ti substrates. Thus, this study reveals the underlying physics of the microscopic transformation of the α-titanium crystal structure under wear-like accidental events.
각질형성세포에서 레티노인산(All-trans Retinoic Acid)에 의한 IL-8 발현의 기전
정예리 ( Yae Lee Chung ),강태원 ( Tae Won Kang ),오성민 ( Sung Min Oh ),정승용 ( Seung Yong Chung ),김수찬 ( Soo Chan Kim ) 대한피부과학회 2009 大韓皮膚科學會誌 Vol.47 No.6
Background: Retinoic acid (RA) has been reported to induce the up-regulation of inflammatory cytokines such as IL-1, TNF-α and IL-8 in dermal fibroblasts and keratinocytes. There is no evidence to support a direct interaction between the RA-mediated transcriptional machinery and IL-8 gene transcription. Objective: The aim of this study is to clarify the mechanism of the up-regulation of IL-8 in keratinocytes by RA. Methods: The IL-1, IL-8, TNF-α and MCP-1 mRNA expressions in HaCaT cells stimulated by RA were measured by quantitative RT-PCR. The effects of a NF-κB inhibitor and IL-1 receptor antagonist (ra) on the IL-8 mRNA expression were measured by quantitative RT-PCR. Electrophoretic motility shift assay (EMSA) was conducted on the RA-stimulated HaCaT cells that were or were not treated with NF-κB inhibitor to measure the NF-κB binding activity in each group. The phospho-IκB activity in the HaCaT cells after stimulation with RA was also measured by Western blotting. Results: An up-regulation of the IL-8 gene expression by RA was demonstrated in the HaCaT cells. The inhibition assay revealed the involvement of the NF-κB binding site of the IL-8 gene in the RA-enhanced promoter activity. EMSA demonstrated that RA enhanced the formation of the DNA-NF-κB complex. There was no evidence to support IL-1 as an intermediate stimulus between the RA-mediated transcriptional machinery and IL-8 gene transcription. Western blot analysis revealed increased phospho-IκB activity in the HaCaT cells after stimulation with RA. Conclusion: Our result suggested that the IL-8 gene expression of HaCaT cells after RA stimulation is caused by the activation of IKK and the dissociation of IκB from NF-κB and the transcription of NF-κB in the nucleus. (Korean J Dermatol 2009;47(6):674∼682)