• 제목/요약/키워드: Androgen

검색결과 293건 처리시간 0.018초

Insulin-Like Growth Factor-I-Induced Androgen Receptor Activation Is Mediated by the PI3K/Akt Pathway in C2C12 Skeletal Muscle Cells

  • Lee, Won Jun
    • Molecules and Cells
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    • 제28권5호
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    • pp.495-499
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    • 2009
  • Although insulin-like growth factor-I (IGF-I) and androgen receptor (AR) are well known effectors of skeletal muscle, the molecular mechanism by which signaling pathways integrating AR and IGF-I in skeletal muscle cells has not been previously examined. In this study, the role of PI3K/Akt on IGF-I-induced gene expression and activation of AR in skeletal muscle cells was investigated. C2C12 cells were treated with IGF-I in the absence or presence of inhibitors of PI3K/Akt pathway (LY294002 and Wortmannin). Inhibition of the PI3K/Akt pathway with LY294002 or Wortmannin led to a significant decrease in IGF-I-induced AR phosphorylation and total AR protein expression. Furthermore, IGF-I-induced AR mRNA and skeletal ${\alpha}-actin$ mRNA were blocked by LY294002 or Wortmannin. Confocal images showed that IGF-I-induced AR translocation from cytosol to nucleus was inhibited significantly in response to treatment with LY294002 or Wortmannin. The present results suggest that modulating effect of IGF-I on AR gene expression and activation in C2C12 mouse skeletal muscle cells is mediated at least in part by the PI3K/Akt pathway.

아다만틸을 기반한 N-아릴아미드 신규 안드로겐 수용체 길항제 (Adamantyl-based N-arylamide as a Novel Series of Androgen Receptor Antagonists)

  • 우병영;신송석;홍용덕;주영협;정연수;이범진;김수동
    • 대한화장품학회지
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    • 제46권1호
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    • pp.43-47
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    • 2020
  • 안드로겐 수용체 길항제로서 N-아릴아미드의 신규한 아다만틸 유도체들을 합성하고 항안드로겐 활성을 평가 하였다. 아다만틸 유도체를 함유하는 N-아릴아미드는 아다만틸 치환체가 없는 유도체보다 더 높은 활성을 가졌다. 아다만틸의 공간부피 및 방향족 고리에 전자밀도 상승효과를 주는 pendant 작용기들이 강력한 길항작용에 결정적인 영향을 미쳤다. 리간드와 수용체 사이의 상호 작용을 설명하기 위해 분자 모델링 연구를 수행 하였다.

Colonic Angioectasia in an Adolescent Boy with Hoyeraal-Hreidarsson on Long-Term Anabolic Steroid Therapy

  • Khalaf, Racha;Cuffari, Carmen
    • Pediatric Gastroenterology, Hepatology & Nutrition
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    • 제21권1호
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    • pp.68-71
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    • 2018
  • Androgen therapy has proven efficacy in treating patients with bone marrow failure who are not candidates for bone marrow transplantation. Herein, we report on a case of colonic angioectasia secondary to oxymetholone use in an adolescent patient with Hoyeraal-Hreidarsson syndrome (HHS). A 13-year-old Caucasian male with HHS characterized by cerebellar hypoplasia, developmental delay, microcephaly, esophageal strictures and myelodysplasia presented with severe hematochezia from colonic angioectasia secondary to long-term oxymetholone therapy. These vascular lesions resolved spontaneously once this anabolic steroid was discontinued. While androgen therapy is often recommended for certain anemias and myelodysplastic syndromes, clinicians should be aware of the potential complication in developing these perceived uncommon colonic angioectasias. Moreover, pediatric gastroenterologists should familiarize themselves in identifying these vascular lesions by colonoscopy, especially among the high risk groups on long-term anabolic steroid therapy.

돼지 Cytochrome P450 Aromatase의 새로운 기능

  • 최인호
    • 한국동물번식학회:학술대회논문집
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    • 한국동물번식학회 2003년도 학술발표대회 발표논문초록집
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    • pp.3-5
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    • 2003
  • 여성호르몬으로 잘 알려진 estrogen은 난소의 granulosa 세포와 정소의 Sertoli 세포에서 주로 생성되는 것으로 알려져 있으며 최근엔 사람의 지방, 근육, 뇌, 뼈세포 등에서의 합성 가능성과 각 조직에서 생성되는 estrogen 의 생리학적인 기능에 관해 많은 관심이 모여져 왔다. 다른 steroid처럼 지방친화적인 (lipophilic) estrogen은 세포막과 핵막을 쉽게 통과하여 목표세포 (target cell)의 핵에 존재하는 estrogen receptor (ER)에 결합하여 특정 유전자를 발현에 관여하는 것으로 알려져 있다. Cytochrome P450 Aromatase (간략히, aromatase)는 steroid hormone을 합성하는 마지막 단계에서 androgens을 estrogens으로 전환시키는데 관여하는 효소이다. Aromatase의 substrate (기질)로 사용되는 androgen에는 androstenedione과 testosterone 등이 있으며, 최종 산물로써 estrone(E1)이나 17$\beta$-estradiol(E2) 등의 estrogen이 생성된다. Aromatase는 steroidogenic tissues의 세포내 골지체에 존재하는 것으로 알려져 있으며, NADPH-cytochrome P450 reductase와 함께 복합체로써 존재한다. NADPH-cytochrome P450 reductase는 다른 steroid hormone에 관여하는 효소들과도 복합체를 형성하여 다른 steroid hormone을 합성할 수 있으므로, 어떤 조직에서 여성호르몬이 만들어질 수 있느냐 하는 것은 그 조직에서 aromatase 단백질이 만들어지느냐에 따라서 결정된다.

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완전 고환성 여성화 증후군 1예 (Complete Testicular Feminization Syndrome - a Case Report -)

  • 조마해;남은숙
    • Advances in pediatric surgery
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    • 제12권1호
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    • pp.47-52
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    • 2006
  • Testicular feminization syndrome (TFS) is a genetic disorder due to androgen insensitivity of the target organs. The most common clinical presentation of complete TFS is inguinal hernia in the infant or primary amenorrhea in the adolescence. A 7-year old phenotypically female patient was seen with a complaint of a right inguinal mass. Under the diagnosis of right inguinal hernia, high ligation was performed. Six months later, the patient showed a left inguinal mass. On operation, the mass looked like a testis. The external genitalia were normal female, but a uterus and ovary were not identified. Chromosome study showed a 46, XY karyotype and the levels of serum testosterone and dihydrotestosterone were increased after HCG stimulation. The patient was diagnosed as complete TFS and underwent bilateral gonadectomy 6 months later.

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