Document Detail

Reactive oxygen species and the regulation of hyperproliferation in a colonial hydroid.
MedLine Citation:
PMID:  21897085     Owner:  NLM     Status:  In-Data-Review    
Abstract Colonies of Podocoryna carnea circulate gastrovascular fluid among polyps via tubelike stolons. At polyp-stolon junctions, mitochondrion-rich cells in part regulate this gastrovascular flow. During competition, colonies hyperproliferate nematocytes and stolons; nematocysts are discharged until one colony is killed. Hyperproliferation then ceases, and normal growth resumes. Here, competing colonies were treated with azide, which inhibits respiration and upregulates reactive oxygen species (ROS). After the cessation of competition, azide-treated colonies continued to hyperproliferate. In azide-treated competing colonies, however, mitochondrion-rich cells were found to produce similar amounts of ROS as those in untreated competing colonies. Subsequent experiments showed that both azide treatment and competition diminished the lumen widths at polyp-stolon junctions, where mitochondrion-rich cells are found. In competing colonies, these diminished widths may also diminish the metabolic demand on these cells, causing mitochondria to enter the resting state and emit more ROS. Indeed, results with two fluorescent probes show that mitochondrion-rich cells in competing colonies produce more ROS than those in noncompeting colonies. In sum, these results suggest that competition perturbs the usual activity of mitochondrion-rich cells, altering their redox state and increasing ROS formation. Via uncharacterized pathways, these ROS may contribute to hyperproliferation.
Katherine L Harmata; Neil W Blackstone
Related Documents :
22036895 - Hmga-targeted phosphorothioate dna aptamers increase sensitivity to gemcitabine chemoth...
19095945 - Representation of geometric borders in the entorhinal cortex.
10716215 - Complex cells as linear mechanisms receiving sequential afferents.
22025085 - The podocyte cytoskeleton-key to a functioning glomerulus in health and disease.
10225955 - Nectin/prr: an immunoglobulin-like cell adhesion molecule recruited to cadherin-based a...
23870175 - Portuguese propolis disturbs glycolytic metabolism of human colorectal cancer in vitro.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Physiological and biochemical zoology : PBZ     Volume:  84     ISSN:  1537-5293     ISO Abbreviation:  Physiol. Biochem. Zool.     Publication Date:    2011 Sep-Oct
Date Detail:
Created Date:  2011-09-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883369     Medline TA:  Physiol Biochem Zool     Country:  United States    
Other Details:
Languages:  eng     Pagination:  481-93     Citation Subset:  IM    
Department of Biological Sciences, Northern Illinois University, DeKalb, Illinois 60115.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Mitochondrial metabolic suppression in fasting and daily torpor: consequences for reactive oxygen sp...
Next Document:  Decreasing urea?trimethylamine N-oxide ratios with depth in chondrichthyes: a physiological depth li...