"Jeff" <kidsdoc2000@hotmail.com> wrote in message
news:WAg8k.30$0f.28@trndny01...
> Mike wrote:
>> Jeff wrote:
>>>
>>> Further, babies excrete mercury from vaccines more quickly than thought:
>>> http://www.urmc.rochester.edu/pr/news/story.cfm?id=1848
>>>
>>
>> So what?
>>
>> From
>> http://www.webmd.com/brain/autism/news/20080130/vaccine-mercury-leaves-blood-fast -
>> -- quote ---
>> One of the few researchers who studies the effects of ethyl mercury is
>> Thomas Burbacher, PhD, professor of environmental and occupational health
>> sciences and director of the infant primate research lab at the National
>> Primate Research Center, University of Washington, Seattle. <...>
>> "Just because it came out of the blood doesn't mean it is excreted from
>> the body. It could have gone to the brain," Burbacher tells WebMD.
>> "Although total mercury levels in the blood are lower following
>> thimerosal exposure [than following methyl mercury exposure], mercury in
>> the blood from thimerosal has an easier time getting to the brain than
>> methyl mercury."
>
> Actually, that's incorrect. Ethyl mercury is pumped OUT of the brain.
>
> It might get to the brain, but it doesn't get INTO the brain.
>
> Jeff
http://www.ncbi.nlm.nih.gov/pubmed/2190116
Mercury neurotoxicity: mechanisms of blood-brain barrier transport.
Aschner M, Aschner JL.
Department of Pharmacology and Toxicology, Albany Medical College, NY 12208.
Mercury exists in a wide variety of physical and chemical states, each of
which has unique characteristics of target organ toxicity. The classic
symptoms associated with exposure to elemental mercury vapor (Hg0) and
methylmercury (CH3Hg+; MeHg) involve the central nervous system (CNS), while
the kidney is the target organ for the mono- and divalent salts of mercury
(Hg+ and Hg++, respectively). Physical properties and redox potentials
determine the qualitative and quantitative differences in toxicity among
inorganic mercury compounds, while the ability of MeHg to cross the
blood-brain barrier accounts for its accumulation in the CNS and a clinical
picture that is dominated by neurological disturbances. This review gives an
up-to-date account of mercury's physical and chemical properties and its
interaction with biologically active sites pertinent to transport across the
blood-brain barrier, a major regulator of the CNS millieu.
PMID: 2190116 [PubMed - indexed for MEDLINE]
--------------------------------------------------------------------------------
Different Forms of Mercury and Differing Health Effects
Mercury occurs naturally in the environment and exists in several forms,
which can be organized under three headings: metallic mercury (i.e.,
elemental mercury-Hg 0, quicksilver), inorganic mercury (i.e., Hg +1
[mercurous salts] or Hg +2 [mercuric salts]), and organic mercury (i.e.,
methyl-, ethyl-, and phenylmercury). Because mercury's absorption and
metabolism depend on its chemical and physical form, it is important to
determine the form of mercury to which an individual is exposed. Different
forms of mercury can have differing health effects (e.g., absorption and
metabolism of different forms of mercury vary and, therefore, have different
effects on the nervous system). When metallic mercury vapors are inhaled,
they readily enter the bloodstream and cross the blood-brain barrier.
Inhaling or ingesting large amounts of methylmercury also results in some of
the mercury crossing the blood-brain barrier and affecting the nervous
system. Inorganic mercury salts, such as mercuric chloride, do not cross the
blood-brain barrier like methylmercury or metallic mercury vapor do. Mercury
affects other systems in addition to the nervous system (ATSDR 1999, 1992).
Poor Jeffrey Peter Joeshp Utz, notkidsdoc
>> --- end of quote ---
>>
>> And this is what really matters: how much mercury got into the brain, not
>> how fast it went through the anus.
