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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+One
2015 ; 10
(8
): e0136197
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English Wikipedia
Dicarbonyl Induced Structural Perturbations Make Histone H1 Highly Immunogenic
and Generate an Auto-Immune Response in Cancer
#MMPMID26317779
Mir AR
; Uddin M
; Khan F
; Alam K
; Ali A
PLoS One
2015[]; 10
(8
): e0136197
PMID26317779
show ga
Increased oxidative stress under hyperglycemic conditions, through the
interaction of AGEs with RAGE receptors and via activation of interleukin
mediated transcription signalling, has been reported in cancer. Proteins
modifications are being explored for their roles in the development and
progression of cancer and autoantibody response against them is gaining interest
as a probe for early detection of the disease. This study has analysed the
changes in histone H1 upon modification by methylglyoxal (MG) and its
implications in auto-immunopathogenesis of cancer. Modified histone showed
modifications in the aromatic residues, changed tyrosine microenvironment,
intermolecular cross linking and generation of AGEs. It showed masking of
hydrophobic patches and a hypsochromic shift in the in ANS specific fluorescence.
MG aggressively oxidized histone H1 leading to the accumulation of reactive
carbonyls. Far UV CD measurements showed di-carbonyl induced enhancement of the
alpha structure and the induction of beta sheet conformation; and thermal
denaturation (Tm) studies confirmed the thermal stability of the modified
histone. FTIR analysis showed amide I band shift, generation of a carboxyethyl
group and N-C? vibrations in the modified histone. LCMS analysis confirmed the
formation of N?-(carboxyethyl)lysine and electron microscopic studies revealed
the amorphous aggregate formation. The modified histone showed altered
cooperative binding with DNA. Modified H1 induced high titre antibodies in
rabbits and the IgG isolated form sera of rabbits immunized with modified H1
exhibited specific binding with its immunogen in Western Blot analysis. IgG
isolated from the sera of patients with lung cancer, prostate cancer, breast
cancer and cancer of head and neck region showed better recognition for
neo-epitopes on the modified histone, reflecting the presence of circulating
autoantibodies in cancer. Since reports suggest a link between AGE-RAGE axis and
carcinogenesis, glycoxidation of histone H1 and its immunogenicity paves ways for
understanding role of glycoxidatively damaged nuclear proteins in cancer.