Navigation Links
Apolipoprotein(a): A natural regulator of inflammation
Date:12/24/2008

In a study to be published in the January 09 issue of Experimental Biology and Medicine, Hoover-Plow and co-workers in seeking to define a role of apo(a) in leukocyte recruitment have identified a novel activity of apo(a) apolipoprotein that may function as a natural and cell specific suppressor of the inflammatory response in vivo. In addition, a mechanism for this novel function of apo(a) was also identified: its selective regulation of cytokine production. These effects of apo(a) are independent of its molecular mimicry of Plg.

Lipoprotein(a) (Lp(a)) is similar to low density lipoprotein (LDL), but contains an additional apolipoprotein, apo(a). Numerous clinical studies conducted over the past 40 years have identified Lp(a) as a risk factor independent from LDL for a variety of cardiovascular pathologies. Much of the focus of apo(a) pathogenic activities has centered on its strong resemblance to plasminogen, the zymogen for plasmin, the primary enzyme for blood clot degradation. In addition to its important role in clot lysis, plasmin is required for leukocyte recruitment in inflammation. While several in vitro studies have demonstrated the interference of apo(a) in plasminogen leukocyte recruitment, evidence for this in vivo has been lacking.

In vivo investigation of Lp(a) function has been impeded by the lack of availability of small animal models. Lp(a) is expressed only in humans, nonhuman primates and the European hedgehog. In this study Hoover-Plow's group utilized mice with apo(a) in a plasminogen deficient or replete background to study leukocyte recruitment in three models of inflammation. Hoover-Plow said "In this study apo(a) impeded neutrophil recruitment in two of the models of inflammation, thioglycollate and lipopolysaccharide induced peritonitis. Apo(a) also inhibited neutrophil chemoattractants, and neutrophil recruitment was restored in mice administered neutrophil chemoattractants. The impaired neutrophil recruitment occurred by a mechanism independent of plasminogen. While the clinical studies point to pathogenic functions of apo(a), a physiological role of Lp(a) has been elusive, but must exist to account for its role in humans and non-human primates, but not most other species. Our results indicate for the first time that apo(a), independent of plasminogen interaction, inhibits neutrophil recruitment in vivo and functions as a cell specific suppressor of the inflammatory response."

Dr. Steven R. Goodman, Editor-in-Chief of Experimental Biology and Medicine, said "Hoover-Plow and colleagues have demonstrated a novel role for apo(a) as a regulator of inflammation. This represents an important contribution to our understanding of the regulation of neutrophil recruitment during the inflammatory response". Experimental Biology and Medicine is a journal dedicated to the publication of multidisciplinary and interdisciplinary research in the biomedical sciences.


'/>"/>

Contact: Dr. Jane Hoover-Plow
hooverj@ccf.org
216-445-8207
Society for Experimental Biology and Medicine
Source:Eurekalert

Related biology news :

1. New research shows how gene function drives natural selection in important class of genetic elements
2. Honey adds health benefits, is natural preservative and sweetener in salad dressings
3. Natural Capital Project to develop conservation software
4. Ecologists say metabolism accounts for why natural selection favors only some species
5. Natural and social sciences: ICSU embraces the need to work more closely together
6. International Council for Science launches major research program on natural disasters
7. Design of a compound that stabilizes the main natural suppressor of tumors
8. Discovery of natural compounds that could slow blood vessel growth
9. Natural childbirth linked to stronger baby bonding than C-sections
10. How plants fine tune their natural chemical defenses
11. Old before their time? Aging in flies under natural vs. laboratory conditions
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/24/2016)... 2016 Cercacor today introduced Ember TM ... non-invasively measure hemoglobin, Oxygen Content, Oxygen Saturation, ... Rate in approximately 30 seconds. Smaller than a smartphone, ... access to key data about their bodies to help ... Hemoglobin carries oxygen to muscles. When ...
(Date:11/17/2016)... 2016 Global Market Watch: Primarily supported ... Population-Based Banks and Academics) market is to witness a value ... shows the highest Compounded Annual Growth Rate (CAGR) of 10.75% ... the analysis period 2014-2020. North America ... by Europe at 9.56% respectively. ...
(Date:11/14/2016)... SARASOTA, Fla., Nov. 14, 2016  xG Technology, Inc. ... in providing critical wireless communications for use in challenging ... ended September 30, 2016. Management will hold a conference ... at 5:00 p.m. Eastern Time (details below). ... announced a $16 million binding agreement to acquire Vislink ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... San Francisco, CA (PRWEB) , ... December 08, ... ... and Oculus as finalists in the World Technology Awards. uBiome is one of ... were received across all categories. , In addition to uBiome, companies nominated as ...
(Date:12/8/2016)... , Dec. 8, 2016 Savannah ... remediation technologies and selected NewTechBio,s NT-MAX Lake ... microbial based beneficial bacteria, in conjunction with Hexa ... correct deficiencies with National Pollutant Discharge Elimination System ... has experienced a steady history of elevated pH ...
(Date:12/7/2016)... (PRWEB) , ... December 07, 2016 , ... ... journal has concluded that “in the setting of previously treated, advanced pancreatic cancer, ... in defining the optimal patient population and timing of blood sampling may improve ...
(Date:12/7/2016)... Ontario , Dec. 7, 2016  Nordion, ... with General Atomics (GA), welcome today,s award by ... Nuclear Security Administration (NNSA) of the Phase II ... project with Nordion and the University of Missouri ... II funding will support the establishment of a ...
Breaking Biology Technology: