Navigation Links
HIV accessory protein disables host immunity via receptor-protein intermediary

Researchers at the University of Pennsylvania School of Medicine discovered that an HIV-1 accessory protein called Vpr destroys the host cell's ability to survive by binding to a host receptor. This, in turn, keeps an important enzyme from activating the cell's immune system. These findings refine an earlier understanding of Vpr HIV pathogenesis and imply new approaches to treating AIDS, inflammatory diseases such as rheumatoid arthritis, and possibly sepsis. This research appears in the February print issue of Nature Cell Biology.

Over a decade ago, Penn's David Weiner, PhD, Associate Professor of Pathology and Laboratory Medicine, and colleagues reported that Vpr corrupted the glucocorticoid receptor (GR) pathway of the host cell. Vpr helps to usurp host-cell function by regulating cell differentiation, cell death, and suppressing host-cell immune response proteins. Weiner's group found that Vpr binds to the glucocorticoid receptor, but it remained unclear whether the GR pathway was required for Vpr to commandeer the host cell's machinery.

"We started to realize a few years ago that no one had asked the real question: Is the glucocorticoid receptor necessary for Vpr's effects on the host cell?" recalls Weiner. To answer this question, the researchers used an siRNA, a short sequence of RNA used to silence gene expression, to completely destroy expression of the glucocorticoid receptor protein.

When the researchers kept the glucocorticoid receptor protein from being made, Vpr did not kill host cells. "This indicated that glucocorticoid receptor function is not what's really necessary for Vpr activity," says Weiner. "The glucocorticoid receptor-Vpr complex must be interacting with something else."

The team, led by first author Muthumani Karuppiah, PhD, Senior Research Investigator, looked for molecules with which the glucocorticoid receptor-Vpr complex would bind and identified PARP-1, another protein that controls the action of NF-
'"/>

Source:University of Pennsylvania School of Medicine


Page: 1 2

Related biology news :

1. New, automated tool successfully classifies and relates proteins in unprecedented way
2. New binding target for oncogenic viral protein
3. Controversial drug shown to act on brain protein to cut alcohol use
4. Timing is everything: First step in protein building revealed
5. UWs Rosetta software to unlock secrets of many human proteins
6. Researchers find how protein allows insects to detect and respond to pheromones
7. Signaling protein builds bigger, better bones in mice
8. Ancient olfaction protein is shared by many bugs, offering new pest control target
9. Automatic extraction of gene/protein biological functions from biomedical text
10. Discovery of key proteins shape could lead to improved bacterial pneumonia vaccine
11. Scientists develop new color-coded test for protein folding
Post Your Comments:
(Date:12/10/2014)... , Dec. 9, 2014  Valencell, a leader ... is seeing a staggering demand from its licensees for ... Company revealed, is not solely coming from fitness and ... well. "A wearable is only as useful ... accuracy is the ultimate driver in long-term mass consumer ...
(Date:12/10/2014)... , December 9, 2014 ... ITN,s BCARD Platform   ... enterprise meeting scheduling solutions for business-to-business (B2B) events, ... world leader in mobile near-field communication (NFC), Bluetooth ...      (Logo: http://photos.prnewswire.com/prnh/20140612/691055) , Jifflenow ...
(Date:12/3/2014)... Dec. 2, 2014   Marvin Test Solutions ... test solutions for military, aerospace, and manufacturing organizations, ... its successful TS-900 PXI semiconductor test platform ... of high-end systems to customers at a fraction ... to traditional ATE. "Our semiconductor ...
Breaking Biology News(10 mins):Wearable Technology Products Demand Highly Accurate Biometric Technology 2Jifflenow And ITN International Bring Cutting-Edge Badge Scanning Technology To B2B Events 2Jifflenow And ITN International Bring Cutting-Edge Badge Scanning Technology To B2B Events 3Marvin Test Solutions Brings New Capabilities to PXI-Based Semiconductor Test with TS-960 2Marvin Test Solutions Brings New Capabilities to PXI-Based Semiconductor Test with TS-960 3
... 22 , 2009SRI International, an independent nonprofit research ... for Cancer Research was selected by the National ... the newly-formed "Chemical Biology Consortium" (CBC), a collaborative ... therapeutics active against novel molecular and genetic cancer ...
... at the Johns Hopkins Malaria Research Institute have for ... the proper conformation and quantity to generate a significant ... in a potential transmission-blocking vaccine. Antibodies induced by Pfs48/45 ... malaria-causing parasite, Plasmodium , as it grows within ...
... July 22, 2009 Berry research is currently attracting ... of the need for a rigorously peer-reviewed publication in ... launch of the Journal of Berry Research . ... (Hon), Universit Politecnica della Marche, Department of Biochemistry, Biology ...
Cached Biology News:SRI announces selection by the National Cancer Institute as a Chemical Biology Consortium center 2Vaccine blocks malaria transmission in lab experiments 2IOS Press announces launch of Journal of Berry Research 2IOS Press announces launch of Journal of Berry Research 3
(Date:12/22/2014)... 22, 2014 The American ... of original research, reviews and editorials addressing developments ... practice, today published a provocative article exploring the ... progression and potential treatment of prostate cancer. ... and proposes the possibility that there could be ...
(Date:12/19/2014)... OR and Hershey, PA (PRWEB) December 19, 2014 ... Pink: BJCT), a leading developer and manufacturer of ... entered into an agreement with Immunomic Therapeutics, Inc. ... Biojector®-2000 needle-free injection device with its LAMP™ vaccine ... an option for an exclusive Worldwide license to ...
(Date:12/19/2014)... , Dec. 19, 2014 Naurex Inc., ... novel drugs for diseases of the central nervous system, ... and chief executive officer, will present at the 33 ... presentation will take place at 3:00 p.m. PST on ... in San Francisco, Calif. ...
(Date:12/19/2014)... 2014 Decision Resources Group finds that the ... 12 percent compound annual growth rate through 2023. This ... and the increasing adoption of dental implants. Growing aesthetic ... also spur demand for dental biomaterials because they can ... treatments. Other key findings from Decision Resources ...
Breaking Biology Technology:Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 2Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 3Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 4Bioject and Immunomic Therapeutics Enter into an Agreement for License of Needle-Free Technology for LAMP-vax Vaccines 2Bioject and Immunomic Therapeutics Enter into an Agreement for License of Needle-Free Technology for LAMP-vax Vaccines 3Naurex to Present at 33rd Annual J.P. Morgan Healthcare Conference 2Latin American Dental Biomaterial Market Will Expand at a 12 Percent Annual Growth Rate Through 2023 2Latin American Dental Biomaterial Market Will Expand at a 12 Percent Annual Growth Rate Through 2023 3
... Hair loss remains an important distressing side effect for ... critical health issues there is no doubt that loss of ... effects of this concern often cause one to become anxious ... by Coates et al, nausea, hair loss and vomiting were ...
... physicists used the electric fields generated by intersecting laser ... spheres, thereby creating 3-D arrays of optically induced crystals. ... the structure of materials of biological interest, including bacteria, ... Raithel is co-author of a research paper on the ...
... International, LLC, a global leader in distributing laboratory ... the business of BioExpress Corp. ... is a well-respected distributor in the education, biotechnology ... well-known, multi-national brands, including its private label brand, ...
Cached Biology Technology:Expert Offers Solution to Hair Loss Concerns 2Lasers used to form 3-D crystals made of nanoparticles 2VWR International, LLC Acquires BioExpress Corp. 2
... unit with motorized heated lid and skirted inner ... for microarrays and chips. The four screw-down points ... force of the motorized lid is set with ... results. This interchangeable Moto Alpha unit functions on ...
... These skirted micro test tubes are ... of polypropylene, these tubes have uniform walls ... nonsterile, with separate O-ring screw caps. The ... and have an operating range from -55 ...
... carriers to suit the widest possible range ... science laboratory. Labware carriers can be placed ... is simple for the user, thanks to ... are correctly guided into position. This allows ...
... For affinity chromatography, Affi-Prep protein ... (IgG), selectively remove IgG prior to ... adsorb immune complexes for antigen purification. ... region of immunoglobulins, especially IgG from ...
Biology Products: