Features | Partner Sites | Information | LinkXpress
Sign In
GLOBETECH PUBLISHING
JIB
GLOBETECH PUBLISHING

Molecular Pair Identified as Key to Host-Cell Invasion by Tick-Transmitted Pathogen

By BiotechDaily International staff writers
Posted on 22 Oct 2012
Image: Two Anaplasma phagocytophilum bacteria (arrows) bound to host cell surfaces; the bacterium on the right (thick arrow) is invading upon triggering its own uptake. (Photo courtesy of Jason Carlyon, PhD, and Matthew J. Troese, PhD / VCU.)
Image: Two Anaplasma phagocytophilum bacteria (arrows) bound to host cell surfaces; the bacterium on the right (thick arrow) is invading upon triggering its own uptake. (Photo courtesy of Jason Carlyon, PhD, and Matthew J. Troese, PhD / VCU.)
A pathogen-host “key and door” molecular pair has been identified as critical for the cell-cell adhesion required for invasion by the tick-transmitted pathogen Anaplasma phagocytophilum. The finding provides an important candidate target for development of drugs and a single vaccine against diseases caused by this and closely related pathogens.

A. phagocytophilum is an Anaplasmataceae family bacterium responsible for causing granulocytic anaplasmosis in humans; other tick-transmitted Anaplasmataceae species often cause diseases in domestic and livestock animals, including cattle. From studies in vitro using mammalian cell cultures and in vivo using mice, scientists at the Virginia Commonwealth University (VCU; Richmond, VA, USA) School of Medicine have shown that “outer membrane protein A” (OmpA) on the surface of A. phagocytophilum is critically important for its invasion of host cells. They also delineated a specific region in OmpA that mediates infection and is conserved among Anaplasmataceae family species. The research team showed that OmpA binds mammalian host cell surface sialylated glycoproteins and confirmed that this interaction is important for the adhesion stage of infection. "In other words, we identified both a key and door that together promote Anaplasma phagocytophilum infection," said lead investigator Jason A. Carlyon, PhD, associate professor, and a George and Lavinia Blick Scholar in the Department of Microbiology and Immunology of the VCU School of Medicine. "These findings are important because our data also establish a direction for development of a single vaccine that protects against members of an entire family of bacteria that cause disease," he added.

The study published online and planned to appear in print in the November 2012 issue of the journal Infection and Immunity (volume 80, issue 11), identifies the first A. phagocytophilum adhesin-receptor pair, and delineates the region of OmpA that is critical for infection. Researchers in Prof. Carlyon's laboratory are presently refining their understanding of the molecular basis for how OmpA promotes infection and are testing its efficacy in protecting against infection by A. phagocytophilum and other pathogenenic Anaplasmataceae members.

Related Links:
Virginia Commonwealth University



comments powered by Disqus

Channels

Genomics/Proteomics

view channel
Image: Alternative splicing produces two protein isoforms (Photo courtesy of Wikimedia Commons).

Key Regulator of Cancer-Inducing Alternative Splicing Identified

Cancer researchers have identified the splicing factor RBM4 (RNA-binding protein 4) as a key determinant in processes that prevent tumor development and spread. RBM4 is known to be crucial to gene splicing... Read more

Drug Discovery

view channel

Ibuprofen May Restore Immune Function in Older Individuals

New research suggests that macrophages from the lungs of old mice respond differently to infections than those of young mice, and ibuprofen given to the mice reversed these changes. New research using lab mice suggests that the solution to more youthful immune function might already be a common over-the-counter pain reliever.... Read more

Therapeutics

view channel
Image: Hair follicle (blue) being attacked by T cells (green) (Photo courtesy of Christiano Lab/Columbia University Medical Center).

Hair Restoration Method Clones Patients’ Cells to Grow New Hair Follicles

Researchers have developed of a new hair restoration approach that uses a patient’s cells to grow new hair follicles. In addition, the [US] Food and Drugs Administration (FDA) recently approved a new drug... Read more

Lab Technologies

view channel
Image: Leica Microsystems launches the inverted research microscope platform Leica DMi8 (Photo courtesy of Leica Microsystems).

New Inverted Microscope Designed to Readily Adapt to Changing Research Demands

A new inverted microscope for biotech and other life science laboratories was designed to readily accommodate modifications and upgrades to allow it to keep current with changing research demands and interests.... Read more

Business

view channel

Partnership Established to Decode Bowel Disease

23andMe (Mountain View, CA,USA), a personal genetics company, is collaborating with Pfizer, Inc. (New York, NY, USA), in which the companies will seek to enroll 10,000 people with inflammatory bowel disease (IBD) in a research project designed to explore the genetic factors associated with the onset, progression, severity,... Read more
 
Copyright © 2000-2014 Globetech Media. All rights reserved.