Sat, Apr-17-10, 13:52
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Senior Member
Posts: 15,075
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Plan: mostly milkfat
Stats: 190/152.4/154
BF:
Progress: 104%
Location: Ontario
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Yes, a process can have more than one effect.
You can't have a mis-healing without many of the factors that go into proper healing being involved. You can't just point at an increase in one of these factors and declare that you have caused heart disease in isolated umbilical endothelial cells. This may or may not be a pathological response.
Every compound, hormone, enzyme etc. in the body has a legitimate purpose. That purpose is not to encourage cancer to grow, atherosclerosis to develop, etc.
I'm still reading the second article you posted, MathManiac. So far I'm at this part;
Quote:
Adhesion molecule expression is induced in vitro by the action of cytokines on endothelial cells. A basal level of ICAM-1 expression exists on resting small vessels; however, ELAM-1 and VCAM-1 are normally absent. Interleukin 1 IL-1 and tumor necrosis factor TNF induce ICAM-1, VCAM-1, and ELAM-1, whereas interferon gamma (IFN-g) induces ICAM-1 alone.8,9.13,14 In vivo,
these cytokines may be produced by several cell types;
in chronic inflammation activated macrophages are likely
to be an important source of IL-1 and TNF.19'20 T lymphocytes
produce IFN-g, together with IL4 and other cytokines
which modulate the effects of the IFN-g.21'22 Recently
IL-1 mRNA and TNF protein have been detected in
macrophages and smooth muscle cells of atherosclerotic
plaques.
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Tumour necrosis factor induces ICAM-1 and VCAM-1?
I found this a while back on tumour necrosis factor and healing in mice;
Quote:
Abstract We examined the effects of lacking tumor necrosis factor α (TNFα) on the healing process of a cutaneous wound in mice using TNFα-deficient mice. A full-thickness circular cutaneous wound 5.0 mm in diameter was produced in the dorsal skin of wild-type (WT) or TNFα-null (KO) mice. After specific intervals of healing, the healing pattern was evaluated by macroscopic observation, histology, immunohistochemistry, or real-time reverse transcription-polymerase chain reaction. Effect of Smad7 gene transfer on the healing phenotype of KO mice was also examined. The results showed that loss of TNFα promotes granulation tissue formation and retards reepithelialization in a circular wound in mouse dorsal skin. Immunohistochemistry showed that distribution of macrophages and myofibroblasts in newly generated granulation tissue seemed similar between WT and KO mice. However, lacking TNFα enhanced mRNA expression of TGFβ1 and collagen Iα2 in such tissue. Smad7 gene transfer counteracted excess granulation tissue formation in KO mice. In conclusion, lacking TNFα potentiates Smad-mediated fibrogenic reaction in healing dermis and retards reepithelialization in a healing mouse cutaneous wound."
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Without tumour necrosis factor, stuff doesn't heal right.
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