{"id":1151,"date":"2016-08-11T10:21:08","date_gmt":"2016-08-11T17:21:08","guid":{"rendered":"https:\/\/keck.usc.edu\/news\/zika-proteins-responsible-for-microcephaly-identified\/"},"modified":"2023-11-19T12:14:28","modified_gmt":"2023-11-19T20:14:28","slug":"zika-proteins-responsible-for-microcephaly-identified","status":"publish","type":"post","link":"https:\/\/keck.usc.edu\/news\/zika-proteins-responsible-for-microcephaly-identified\/","title":{"rendered":"Zika proteins responsible for microcephaly identified"},"content":{"rendered":"\n \n \n\n\n\n\n\n\n\n
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\n\n \n Press Release<\/span>\n\n\n\n<\/div>\n \n \n
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Zika proteins responsible for microcephaly identified<\/h1>\n\n\n<\/div>\n \n \n
\n Zen Vuong<\/span>\n \n August 11, 2016<\/span>\n <\/div>\n \n \n
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\"AndreBorgesAgenciaBrasilia.121657\"USC researchers have identified\u00a0two Zika proteins potentially responsible for thousands of microcephaly cases in Brazil and elsewhere \u2014 taking one small step toward preventing Zika-infected mothers from birthing babies with abnormally small heads.
\nThe Zika virus contains 10 proteins, but only NS4A and NS4B matter when it comes to microcephaly, according to a USC-led study published in the journal Cell Stem Cell<\/em> on Aug. 11. These miscreant proteins, researchers discovered, have two shared life goals: to handicap fetal brain formation and to mobilize their malevolent forces.
\nResearchers said they are the first to examine three strains of Zika in second trimester human fetal neural stem cells. Previous studies created tiny neural stem cell organoids from adult origin.
\nThe USC-led study, a collaborative effort between the virology and neurobiology disciplines, is also the first to examine Zika virus on the molecular level, said Jae Jung<\/a>, senior corresponding author and distinguished professor and chair of the Department of Molecular Microbiology and Immunology<\/a> at the Keck School of Medicine of USC.
\n\u201cWe now know the molecular pathway, so we made the first big step toward target therapy for Zika-induced microcephaly,\u201d Jung said. \u201cYears from now, one shot or a series of shots could target the proteins NS4A and NS4B or their collaborators.\u201d
\nThe Centers for Disease Control and Prevention in April confirmed that Zika virus causes microcephaly and other severe fetal brain defects, but it was unclear how. Jung and his colleagues explained the molecular mechanisms that lead to the devastating condition.
\n\u201cThis field moves so fast; however, no one has examined the viral proteins in Zika before,\u201d said Jung, holder of the Fletcher Jones Foundation chair in molecular microbiology and immunology. \u201cThe scientific community knows what the Zika virus does but not who is responsible. It\u2019s the difference between saying this nation\u2019s Olympic team earned a gold medal or saying the swim team won the gold medal. My lab is scrutinizing the jobs Zika proteins have in the creation of disease.\u201d<\/p>\n

How the two miscreant Zika proteins operate<\/h3>\n

The miscreant Zika proteins smack a cellular signaling gatekeeper called \u201cAkt-mTOR pathway\u201d until it is disoriented and can no longer properly guard brain development and autophagy regulation, the cell\u2019s recycling factories. Autophagy usually digests and kills pathogens; however, when a family of viruses called flaviviruses (dengue, hepatitis C and Zika) infects a cell, autophagy helps the virus proliferate.
\n\u201cZika loves and needs autophagy,\u201d Jung said. \u201cZika raises the activity in this recycling factory so they can use the energy and nutrients there to replicate. It\u2019s possible that since Zika is using most of the energy, the neuronal stem cells are left with metabolic deficits. Thus the chances for them to differentiate and mature into neurons and other brain cell types is much lower.\u201d
\nIn short, Zika NS4A and NS4B proteins stunt brain development and prod autophagy to mushroom so that the virus could spread. When these two key proteins hijacked fetal neural stem cells, the size of brain organoids were, on average, halved, according to the study.
\nWorking collaboratively, the two proteins stunted the growth of fetal neural stem cells further by 65 percent. Moreover, differentiation of neural stem cells into mature brain cells, such as neurons and star-shaped supporting cells called astrocytes, was reduced by up to 51 percent.<\/p>\n

Taking the next step<\/h3>\n

USC researchers are already working on experiments to better demonstrate the functions of NS4A and NS4B in brain organoids and in mouse models, said Zhen Zhao, corresponding co-author and an assistant professor of research physiology and biophysics. He worked with Berislav Zlokovic, director of the Zilkha Neurogenetic Institute at Keck Medicine of USC.
\n\u201cIt is important to remember that not every pregnant woman infected with Zika virus gives birth to a baby with microcephaly,\u201d Zhao said. \u201cNevertheless, we are trying to develop a cure for that percentage that does get Zika-related microcephaly.\u201d
\nScientists are still looking for effective biomarkers to indicate when a pregnant woman who has been infected with Zika needs intervention. MRI is one possibility, but more work needs to be done, Zhao said.
\nThe research was supported by the National Institutes of Health, Hastings Foundation, Fletcher Jones Foundation, Global Research Lab Program, National Research Foundation of Korea, Alzheimer\u2019s Association and Cure for Alzheimer\u2019s Fund. Lead author Qiming Liang is a special fellow of the Leukemia & Lymphoma Society and is supported by the Shanghai Institutions of Higher Learning.<\/p>\n\n\n\n<\/div>\n <\/div>\n\n\n <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":60,"featured_media":1152,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[6],"tags":[596,603,436],"class_list":["post-1151","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-press-release","tag-department-of-immunology-and-immune-therapeutics","tag-department-of-physiology-and-neuroscience","tag-usc-stem-cell"],"acf":[],"yoast_head":"\nZika proteins responsible for microcephaly identified<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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