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Pharmacological target focused transcriptomic analysis of native versus cultured human and mouse dorsal root ganglia

ABSTRACT: Pharmacological target focused transcriptomic analysis of native versus cultured human and mouse dorsal root ganglia

PROVIDER: PRJNA591587 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10529335.fastq.gz	Fastqsanger.gz
	SRR10529336.fastq.gz	Fastqsanger.gz
	SRR10529337.fastq.gz	Fastqsanger.gz
	SRR10529338.fastq.gz	Fastqsanger.gz
	SRR10529339.fastq.gz	Fastqsanger.gz

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Pharmacological target focused transcriptomic analysis of native versus cultured human and mouse dorsal root ganglia

Project description:Dorsal root ganglion (DRG) neurons detect sensory inputs and are crucial for pain processing. They are often studied in vitro as dissociated cell cultures with the assumption that this reasonably represents in vivo conditions. However, to our knowledge, no study has directly compared genome-wide transcriptomes of DRG tissue in vivo versus in vitro, or between laboratories and culturing protocols. Comparing RNA sequencing-based transcriptomes of native to cultured (4 days in vitro) human or mouse DRG, we found that the overall expression levels of many ion channels and GPCRs specifically expressed in neurons are markedly lower although still expressed in culture. This suggests that most pharmacological targets expressed in vivo are present under the condition of dissociated cell culture, but with changes in expression levels. The reduced relative expression for neuronal genes in human DRG cultures is likely accounted for by increased expression of genes in fibroblast-like and other proliferating cells, consistent with their mitotic status in these cultures. We found that the expression of a subset of genes typically expressed in neurons increased in human and mouse DRG cultures relative to the intact ganglion, including genes associated with nerve injury or inflammation in preclinical models such as BDNF, MMP9, GAL, and ATF3. We also found a striking upregulation of a number of inflammation-associated genes in DRG cultures, although many were different between mouse and human. Our findings suggest an injury-like phenotype in DRG cultures that has important implications for the use of this model system for pain drug discovery. Related datasets : Human datasets are present in the dbGaP study id phs001158.v3.p1 . Use the sample attribute "Project id" to determine which samples In that were used for thie project "Pharmacological target focused transcriptomic analysis of native versus cultured human and mouse dorsal root ganglia"

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Pharmacological target-focused transcriptomic analysis of native vs cultured human and mouse dorsal root ganglia.

Project description:Dorsal root ganglion (DRG) neurons detect sensory inputs and are crucial for pain processing. They are often studied in vitro as dissociated cell cultures with the assumption that this reasonably represents in vivo conditions. However, to the best of our knowledge, no study has directly compared genome-wide transcriptomes of DRG tissue in vivo versus in vitro or between laboratories and culturing protocols. Comparing RNA sequencing-based transcriptomes of native to cultured (4 days in vitro) human or mouse DRG, we found that the overall expression levels of many ion channels and G-protein-coupled receptors specifically expressed in neurons are markedly lower although still expressed in culture. This suggests that most pharmacological targets expressed in vivo are present under the condition of dissociated cell culture, but with changes in expression levels. The reduced relative expression for neuronal genes in human DRG cultures is likely accounted for by increased expression of genes in fibroblast-like and other proliferating cells, consistent with their mitotic status in these cultures. We found that the expression of a subset of genes typically expressed in neurons increased in human and mouse DRG cultures relative to the intact ganglion, including genes associated with nerve injury or inflammation in preclinical models such as BDNF, MMP9, GAL, and ATF3. We also found a striking upregulation of a number of inflammation-associated genes in DRG cultures, although many were different between mouse and human. Our findings suggest an injury-like phenotype in DRG cultures that has important implications for the use of this model system for pain drug discovery.

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Project description:Loss of function of dystonin cytoskeletal linker proteins causes neurodegeneration in the sensory ataxia, dystonia musculorum (dt). While much investigation has focused on understanding dt pathology, divergent functions of dystonin isoforms are still unknown. Here, we highlight a novel function of the dystonin-a2 isoform in mediating microtubule (MT) stability, golgi organization and flux through the secretory pathway. Using dystonin-null mice combined with isoform-specific loss of function analysis, we find dystonin-a2 is bound to MAP1B in the area surrounding the centrosome, where it maintains MT acetylation. In dt, the absence of the MAP1B-dystonin-A2 interaction results in a loss of MAP1B perinuclear localization, leading to MT deacetylation and instability. Deacetylated MTs lead to golgi fragmentation and prevent anterograde trafficking of motor proteins. Maintenance of MT acetylation through TSA administration or MAP1B overexperssion in vitro, mitigates the observed defect. These aberrations are apparent in pre-phenotype dorsal root ganglia (DRG) and primary sensory neurons, suggesting they are causal in the dt disorder. P4 dorsal root ganglia (DRG) tissue from 3 WT and 3 dt27J animals from 2 separate litters was subjected to RNA extraction and analyzed.

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