Review Article

MicroRNAs in the Neural Retina

Table 2

Differentially expressed microRNAs in retinal cell types.

MicroRNARegulation/functionRetinal cell typeRefs

miR-204, miR-211UpregulatedRPE[48]
miR-23aUpregulated (in healthy cells)  
Downregulated (in AMD)
RPE[49]
miR-183/96/182Downregulated in dark  
Upregulated in light
Photoreceptors and interneurons of the inner nuclear layer[36]
miR-29bUpregulated after streptozotocin (STZ) injection; upregulation protects against apoptosisRGCs and cells of the INL[47]
mir-133bOverexpression suppresses maturation and function of dopaminergic amacrine cellsDopaminergic amacrine cells[46]
mir-124Abundantly expressed in differentiated neurons All retinal cell layers, but is not detected in the RPE[45]
miR-155*, miR-124.Resting microglia: low expression of miR-155 and high expression of miR-124  
Activation phenotype (M1): downregulation of miR-124, upregulation of miR-155  
Activation phenotype (M2): upregulation of miR-124, 
downregulation of miR-155
Microglia [52]

Expression of these miRNAs has been reported for microglia of the brain.