Name: interferons block viral replication
Uploaded: 2026-03-12T13:36:03.000Z
Duration: 1 min 30 s
Channel: JoVE

인터페론은 바이러스 단백질 합성을 차단하여 바이러스 복제를 억제하는 천연 항바이러스제입니다.페기일화 인터페론은 폴리에틸렌글리콜을 인터페론에 결합하여 생성되는 재조합 인터페론의 한 종류입니다.이 인터페론들은 건강한 숙주 세포의 수용체에 결합하여 인터페론 자극 유전자의 발현을 촉진합니다.이 유전자들은 처음에는 비활성 상태로 존재하는 여러 항바이러스 단백질의 합성을 유도합니다.이 중 세 가지인 단백질 키나아제(단백질 키나아제), 올리고아데닐레이트 합성효소(oligoadenylate synthetase), RNase L은 바이러스 mRNA 번역을 중단하는 데 핵심적인 역할을 합니다.바이러스 감염 시 바이러스 이중 가닥 RNA의 존재가 이 단백질들을 활성화시킵니다.활성 단백질 키나아제 R은 진핵생물의 번역 시작 인자 2⍺을 인산화하여 바이러스와 숙주 mRNA의 번역을 모두 차단합니다.또한, 올리고아데닐레이트 합성효소는 RNase L을 활성화하는 짧은 아데닐레이트 분자 사슬을 합성합니다.활성 RNase L은 바이러스와 숙주 mRNA를 분해하여 감염된 세포에서 단백질 합성을 중단시킵니다. 이로 인해 세포 사멸이 촉진되고 바이러스 복제가 제한됩니다.

바이러스 단백질 합성 억제제

Inhibitors of Viral Protein Synthesis

단백질 합성은 바이러스 복제에 필수적입니다. 바이러스는 이 과정을 위한 세포 기구가 없어 숙주의 번역 장치를 장악해야 하기 때문입니다. 이에 대응하여 숙주 세포는 바이러스 전파를 억제하는 데 중심적인 역할을 하는 특수 사이토카인인 인터페론을 포함한 중요한 선천 면역 방어를 발휘합니다.바이러스가 검출되면, 감염된 세포는 인터페론을 방출하여 인접한 감염되지 않은 세포의 수용체에 결합하여 JAK-STAT 신호 전달 경로를 활성화하고 인터페론 자극 유전자(ISG)의 발현을 촉진합니다. 이 ISGs는 단백질 키나제 R(PKR), 2',5'-올리고아데닐레이트 합성효소(OAS), RNase L의 발현을 유도합니다. 감염과 관련된 분자 패턴인 바이러스 이중가닥 RNA(dsRNA)는 PKR과 OAS를 직접 활성화합니다.활성화된 PKR은 진핵생물 번역 개시 인자 2(eIF2α)의 알파 소단위를 인산화하여 mRNA 번역 시작을 멈추고 바이러스 및 숙주 단백질 합성을 억제합니다. 동시에 OAS는 RNase L을 활성화하는 2',5' 연관 올리고아데닐레이트의 생성을 촉매합니다. 활성 RNase L은 리보솜 RNA를 포함한 바이러스 및 세포 RNA를 절단하여 단백질 합성의 차단을 악화시키고 세포 내 항바이러스 상태를 증폭시킵니다.재조합 인터페론의 임상 응용강력한 항바이러스 특성 덕분에 재조합 인터페론은 여러 바이러스 질환의 임상 관리에 활용되어 왔습니다:<ul><li>항바이러스 치료: 인터페론-알파(IFN-α)는 만성 B형 및 C형 간염 감염 치료의 역사적 핵심 물질로 사용되어 바이러스 부하를 줄이고 질병 진행을 지연시켜 왔습니다. C형 간염에서는 직접 작용 항바이러스제(DAA)가 등장하기 전까지 페길레이드 인터페론과 리바비린의 병용이 표준 치료법이었으며, DAA는 현재 더 우수한 효능과 내약성을 제공합니다. IFN-α는 또한 인간유두종바이러스(HPV) 관련 병변과 HIV와 연관된 카포시 육종 치료에도 사용됩니다.</li><li>종양학: IFN-α는 털세포 백혈병, 만성 골수성 백혈병, 악성 흑색종, 신세포암과 같은 특정 혈액학적 악성 종양에서 면역조절제로 작용합니다.</li><li>면역학: 인터페론-베타(IFN-β)는 다발성 경화증 관리에 널리 사용되어 재발 빈도를 줄이고 장애 진행을 지연시킵니다.</li></ul>임상적 이점에도 불구하고, 인터페론 치료는 독감 유사 증상, 피로, 우울증, 혈액학적 이상 등 부작용과 연관되어 일부 환자에게 사용이 제한될 수 있습니다. 그럼에도 불구하고, 이러한 다양한 응용 분야는 인터페론이 항바이러스, 종양학, 면역학 영역 전반에 걸쳐 얼마나 다재다능하고 임상적으로 중요한지를 강조합니다.

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's ...

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Education

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JoVE Core

Microbiology

미생물학

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Antimicrobial Agents

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KEY TERMS AND CONCEPTS

주요 용어 및 개념

interferons block viral replication

Interferons block viral replication by shutting down protein synthesis and activating the cell’s antiviral defenses. Viruses need the host cell’s translational machinery to make proteins, because they do not have the machinery to do this on their own. When a virus is detected, infected cells release interferons, which are cytokines, or signaling proteins, that warn nearby uninfected cells.

Interferons bind to receptors on nearby cells and activate the JAK-STAT signaling pathway. This turns on interferon-stimulated genes, or ISGs. These genes lead to the production of three key antiviral proteins: protein kinase R (PKR), 2',5'-oligoadenylate synthetase (OAS), and RNase L.

Viral double-stranded RNA, or dsRNA, helps activate PKR and OAS. PKR phosphorylates the alpha subunit of eukaryotic translation initiation factor 2, called eIF2alpha. This blocks the start of mRNA translation and slows both viral and host protein synthesis. At the same time, OAS makes 2',5'-linked oligoadenylates, which activate RNase L.

Active RNase L breaks down viral and cellular RNA, including ribosomal RNA. This deepens the shutdown of protein synthesis and strengthens the antiviral state in the cell. Recombinant interferons have also been used in medicine, especially for chronic hepatitis B and C, HPV-associated lesions, and Kaposi's sarcoma linked to HIV.

Interferon-alpha, or IFN-alpha, was a historical treatment for hepatitis C before direct-acting antivirals became available. Pegylated interferon with ribavirin was once standard therapy for hepatitis C. IFN-alpha is also used in some cancers, including hairy cell leukemia, chronic myeloid leukemia, malignant melanoma, and renal cell carcinoma.

Interferon-beta, or IFN-beta, is used to manage multiple sclerosis. It can reduce relapse frequency and slow disability progression. Interferon treatments can also cause flu-like symptoms, fatigue, depression, and blood-related abnormalities, which may limit their use.

Interferons Block Viral Replication

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key terms and concepts

Learn how interferons stop viral replication by turning on PKR, OAS, and RNase L, and see their uses in hepatitis, HPV, cancer, and multiple sclerosis.

Interferons Block Viral Replication | JoVE K12

JoVE Core Microbiology provides an engaging introduction to the microbial world and its influence on health, industry, and the environment. This comprehensive collection covers key concepts such as microbial structure, metabolism, genetics, and ecology. It introduces essential laboratory techniques and microscopy methods through visually engaging animations. Corresponding scientist-in-action videos bridge classroom concepts with real-world research and applications.

microbiology

Interferons Block Viral Replication

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