mRNA expression of transient receptor potential melastatin (TRPM) channels 2 and 7 in perinatal brain development.
TRPM7 and TRPM2 are non-specific cation channels of the Transient Receptor Potential channel superfamily. Each channel has gained attention for their potential to mediate oxidative and anoxic cell death (Rama and García, 2016; Nazıroğlu, 2011a; Abiria et al., 2017; Sun, 2017), however their physiological expression and roles in the developing brain remain poorly defined. We employed real-time reverse transcription PCR to examine mRNA expression of TRPM7 and TRPM2 in the developing rat brain and brain-specific cell types. We determined the temporal and spatial expression patterns at four developmental time points (postnatal day 7, 14, 21, and 90) in four critical regions of the brain (cortex, hippocampus, striatum, and cerebellum) and examined gene expression in neuronal, astrocytic, and microglial primary cell cultures. Our results revealed that TRPM7 mRNA expression peaks in the cortex at 2-weeks after birth, and thus correlates most closely with a period of rat brain development associated with neurite outgrowth, which is heightened at 2-weeks after birth. Our cell-specific gene expression assays revealed that TRPM7 was expressed at equivalent levels in neurons, astrocytes, and microglia. Conversely, TRPM2 was most highly expressed in microglia with little expression in neurons and astrocytes. In the hippocampus and striatum, the expression profile of TRPM2 parallels the perinatal expression timeline for microglial infiltration and maturation in the rat brain. Microglial maturation is highest from the time of birth, up to 7-days, but subsequently declines. The latter developmental expression profiles indicate a role for TRPM2 in microglial activation.
['Ratnam|Melanie|M|', 'Chan|Jonathan|J|', 'Lesani|Naghmeh|N|', 'Sidorova-Darmos|Elena|E|', 'Eubanks|James H|JH|', 'Aarts|Michelle M|MM|']
D000375:Aging D000818:Animals D001253:Astrocytes D001921:Brain D001923:Brain Chemistry D006624:Hippocampus D008297:Male D017628:Microglia D017072:Neostriatum D009474:Neurons D061251:Primary Cell Culture D012333:RNA, Messenger D051381:Rats D017207:Rats, Sprague-Dawley D060888:Real-Time Polymerase Chain Reaction D050053:TRPM Cation Channels
mRNA expression Brain Development Neuron Astrocyte Microglia Real-time PCR