person: Yu-Tzu Lin

National Health Research Institutes; Tainan, Taiwan

paper:

Lin YT et al. (2006) Free Radic Biol Med "Manganous ion supplementation accelerates wild type development, enhances stress resistance, and rescues the life span of a short-lived Caenorhabditis elegans mutant."

Rangel N, Hoang H, Sampayo JN, Srinivasan C, Lithgow GJ, Hsieh SI, Lin YT, Foster AL

[Free Radic Biol Med, 2006]

Relative to iron and copper we know very little about the cellular roles of manganese. Some studies claim that manganese acts as a radical scavenger in unicellular organisms, while there have been other reports that manganese causes Parkinson''s disease-like syndrome, DNA fragmentation, and interferes with cellular energy production. The goal of this study was to uncover if manganese has any free radical scavenging properties in the complex multicellular organism, Caenorhabditis elegans. We measured internal manganese in supplemented worms using inductively coupled plasma mass spectrometry (ICP-MS) and the data obtained suggest that manganese supplemented to the growth medium is taken up by the worms. We found that manganese did not appear to be toxic as supplementation did not negatively effect development or fertility. In fact, supplementation at higher levels accelerated development and increased total fertility of wild type worms by 16%. Manganese-supplemented wild type worms were found to be thermotolerant and, under certain conditions, long-lived. In addition, the oxidatively challenged C. elegans strain mev-1''s short life span was significantly increased after manganese supplementation. Although manganese appears to be beneficial to C. elegans, the mode of action remains unclear. Manganese may work directly as a free radical scavenger, as it has been postulated to do so in unicellular organisms, or may work indirectly by up regulating several protective factors.

interaction: mpk-1 : vab-1

MAPK-YT staining is observed in the most proximal oocyte of wild-type hermaphrodites. vab-1(null) hermaphrodites exhibit an expanded pattern of MAPK activation in which MAPK-YT staining extends to distal oocytes.

antibody: WBAntibody00000989

Monoclonal antibody against diphosphorylated (activated) form of MAPK (MAPK-YT). mpk-1

interaction: mpk-1 : vav-1

MAPK-YT staining is observed in the most proximal oocyte of wild-type hermaphrodites. vav-1(RNAi) hermaphrodites exhibit an expanded pattern of MAPK activation in which MAPK-YT staining extends to distal oocytes.

interaction: dab-1 : mpk-1

MAPK-YT staining is observed in the most proximal oocyte of wild-type hermaphrodites. dab-1(gk291 or RNAi) hermaphrodites exhibit an expanded pattern of MAPK activation in which MAPK-YT staining extends to distal oocytes.

interaction: F10C2.10 : F10C2.3 : mpk-1 : pkc-1

MAPK-YT staining is observed in the most proximal oocyte of wild-type hermaphrodites. pkc-1 (ok563 or RNAi) hermaphrodites exhibit an expanded pattern of MAPK activation in which MAPK-YT staining extends to distal oocytes.

interaction: mpk-1 : stam-1

MAPK-YT staining is observed in the most proximal oocyte of wild-type hermaphrodites. pqn-19(ok406 or RNAi) hermaphrodites exhibit an expanded pattern of MAPK activation in which MAPK-YT staining extends to distal oocytes.

transgene: arEx1092

Caenorhabditis elegans

[lin-28p::lin-28::lin-28 3'UTR-lin-4BSmut]

transgene: arEx1093

Caenorhabditis elegans

[lin-28p::lin-28::lin-28 3'UTR-lin-4BSmut]