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Macrophage polarization is a process by which macrophages adopt different functional programs in response to the signals from their microenvironment. This ability is connected to their multiple roles in the organism: they are powerful effector cells of the innate immune system, but also important in removal of cellular debris, embryonic development and tissue repair.
In adipose tissue, distinction between M1 and M2 macrophage polarization can be monitored by assessing the expression of selected markers. Macrophages displaying M1 phenotype have been characterized by expression of F4/80, CD11c and iNOS whereas macrophages displaying M2 phenotype have been characterized by expression of F4/80, CD301 and Arg1. [10]
Both M1 and M2 macrophages play a role in promotion of atherosclerosis. M1 macrophages promote atherosclerosis by inflammation. M2 macrophages can remove cholesterol from blood vessels, but when the cholesterol is oxidized, the M2 macrophages become apoptotic foam cells contributing to the atheromatous plaque of atherosclerosis. [55] [56]
The lateral, convex side of the primary motor cortex is arranged from top to bottom in areas that correspond to the buttocks, torso, shoulder, elbow, wrist, fingers, thumb, eyelids, lips, and jaw. The arm and hand motor area is the largest, and occupies the part of precentral gyrus between the leg and face area.
The M1 segment perforates the brain with numerous anterolateral central (lateral lenticulostriate) arteries, which supply the basal ganglia. M2: Extending anteriorly on the insula, this segment is known as the insular segment. It is also known as the Sylvian segment when the opercular segments are included.
In the reddish-gray mouse lemur, the first lower molar (m1) is squared and both the first and second upper molars (M1 and M2) have slight indentations around the middle of the posterior margin. The gray mouse lemur has a more elongated m1 and lacks the aforementioned indentation on M1 and M2. [20]
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