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Journals Medicinal Research Reviews Volume 28 Issue 4

Macrophages are central to the initiation and progression of atherosclerosis and thus can be very appropriate targets for therapy. Cell adhesion molecules mediating monocytes recruitment to the endothelium are attractive therapy targets and their inhibitors are in clinical trials. Macrophage scavenger receptors like SR‐A and CD‐36 mediate foam cell formation by facilitating the uptake of modified lipids. Peroxisome proliferator‐activated receptors (PPAR), liver X receptor (LXR)‐mediated signaling, mitogen‐activated protein kinase (MAPK) induced phosphorylation events seem to play an important role in this phenomenon. Proteins affecting macrophage cholesterol metabolism and transport, including ATP‐binding cassette (ABC) A1, ABCG1, acyl‐CoA:cholesterol acyltransferase (ACAT), apolipoprotein A‐1 (ApoA‐1), neutral cholesteryl ester hydrolase (NCEH) also regulate foam cell formation and are being developed as therapeutic targets by many pharmaceutical companies. Macrophage proliferation and apoptosis are important events controlling inflammatory response, plaque vulnerability, and destabilization. Free cholesterol (FC) activates the macrophage endoplasmic reticulum (ER) stress pathway and apoptosis. Free radicals and nitric oxide also modulate macrophage foam cell formation and apoptosis. Various antioxidants like AGI‐1067 and BO‐653 are in clinical trials for atherosclerosis treatment. Macrophage matrix metalloproteinase's (MMP's) play a significant role in weakening and rupture of plaques. Efforts are on to develop isoform specific MMP inhibitor. CD‐14, MMP‐3, ABCA1, Toll‐like receptor‐4 (TLR‐4), lectin‐like oxidized low‐density lipoprotein receptor‐1 (LOX‐1), arachidonate lipoxygenase‐15 (ALOX‐15), and Connexin37 polymorphisms and macrophage dysfunction signify their importance in atherosclerosis. Deciphering the role of macrophages in regulating dyslipidemia and inflammation during atherosclerosis is important for developing them as therapeutic targets. © 2007 Wiley Periodicals, Inc. Med Res Rev, 28, No. 4, 483–544, 2008

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Macrophages: An elusive yet emerging therapeutic target of atherosclerosis

Tiwari, R.L.; Singh, V.; Barthwal, M.K.
Medicinal Research Reviews , Volume 28 (4)
Wiley – Jul 1, 2008

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