Relationships between Circadian Rhythms and Modulation of Gene Expression by Glucocorticoids in Skeletal Muscle. Export

@article{citeulike:3171025, abstract = {The existence and maintenance of biological rhythms linked to the 24 hour light:dark cycle are essential to the health and functioning of an organism. Although much is known concerning central clock mechanisms, much less is known about control in peripheral tissues. In this study, circadian regulation of gene expression was examined in rat skeletal muscle. A rich time series involving 54 animals sacrificed at 18 distinct time points within the 24 hour cycle was performed, and mRNA expression in gastrocnemius muscles was examined using Affymetrix gene arrays. Data mining identified 109 genes that were expressed rhythmically, which could be grouped into 8 distinct temporal clusters within the 24 hour cycle. These genes were placed into 11 functional categories, which were examined within the context of temporal expression. Transcription factors involved in the regulation of central rhythms were examined, and 8 were found to be rhythmically expressed in muscle. Because endogenous glucocorticoids are a major effector of circadian rhythms, genes identified here were compared with those identified in previous studies as glucocorticoid regulated. Of the 109 genes identified here as circadian regulated, only 55 were also glucocorticoid regulated. Examination of transcription factors involved in circadian control suggests that corticosterone may be the initiator of their rhythmic expression patterns in skeletal muscle. Key words: corticosteroids, clock genes, gene arrays, expression profiling.}, address = {SUNY at Buffalo.}, author = {Almon, Richard R R. and Yang, Eric and Lai, William and Androulakis, Ioannis P P. and Ghimbovschi, Svetlana and Hoffman, Eric P P. and Jusko, William J J. and Dubois, Debra C C.}, citeulike-article-id = {3171025}, citeulike-linkout-0 = {http://dx.doi.org/10.1152/ajpregu.90399.2008}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/18667713}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=18667713}, day = {30}, doi = {10.1152/ajpregu.90399.2008}, issn = {0363-6119}, journal = {American journal of physiology. Regulatory, integrative and comparative physiology}, keywords = {circadian, corticosterone, glucocorticoids, skeletal\_muscle}, month = {July}, posted-at = {2008-08-29 04:18:53}, priority = {3}, title = {Relationships between Circadian Rhythms and Modulation of Gene Expression by Glucocorticoids in Skeletal Muscle.}, url = {http://dx.doi.org/10.1152/ajpregu.90399.2008}, year = {2008} }

TY - JOUR ID - citeulike:3171025 L3 - citeulike-article-id:3171025 N2 - The existence and maintenance of biological rhythms linked to the 24 hour light:dark cycle are essential to the health and functioning of an organism. Although much is known concerning central clock mechanisms, much less is known about control in peripheral tissues. In this study, circadian regulation of gene expression was examined in rat skeletal muscle. A rich time series involving 54 animals sacrificed at 18 distinct time points within the 24 hour cycle was performed, and mRNA expression in gastrocnemius muscles was examined using Affymetrix gene arrays. Data mining identified 109 genes that were expressed rhythmically, which could be grouped into 8 distinct temporal clusters within the 24 hour cycle. These genes were placed into 11 functional categories, which were examined within the context of temporal expression. Transcription factors involved in the regulation of central rhythms were examined, and 8 were found to be rhythmically expressed in muscle. Because endogenous glucocorticoids are a major effector of circadian rhythms, genes identified here were compared with those identified in previous studies as glucocorticoid regulated. Of the 109 genes identified here as circadian regulated, only 55 were also glucocorticoid regulated. Examination of transcription factors involved in circadian control suggests that corticosterone may be the initiator of their rhythmic expression patterns in skeletal muscle. Key words: corticosteroids, clock genes, gene arrays, expression profiling. JF - American journal of physiology. Regulatory, integrative and comparative physiology SN - 0363-6119 AD - SUNY at Buffalo. TI - Relationships between Circadian Rhythms and Modulation of Gene Expression by Glucocorticoids in Skeletal Muscle. KW - circadian KW - corticosterone KW - glucocorticoids KW - skeletal_muscle AU - Almon, Richard R AU - Yang, Eric AU - Lai, William AU - Androulakis, Ioannis P AU - Ghimbovschi, Svetlana AU - Hoffman, Eric P AU - Jusko, William J AU - Dubois, Debra C PY - 2008/07/30/ UR - http://dx.doi.org/10.1152/ajpregu.90399.2008 ER -