RNASeq-derived transcriptome comparisons reveal neuromodulatory deficiency in the CO2 insensitive brown Norway rat.
RNASeq-derived transcriptome comparisons reveal neuromodulatory deficiency in the CO2 insensitive brown Norway rat.
复制标题
RNASeq 衍生的转录组比较揭示了对 CO2 不敏感的棕色挪威大鼠的神经调节缺陷。
DOI:
10.1113/jphysiol.2014.285171
复制
发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Hodges,MatthewR
中科院分区:
文献类型:
--
作者:
Puissant,MadeleineM;Echert,AshleyE;Yang,Chun;MouradianJr,GaryC;Novotny,Tyler;Liu,Pengyuan;Liang,Mingyu;Hodges,MatthewR
Key pointsIncreases in carbon dioxide (CO2) provide a major chemical stimulus to breathe through activation of the ventilatory CO2chemoreflex, which is heavily influenced by the brainstem serotonergic (5‐HT) system.Brown Norway (BN) rats have an inherent and extremely low ventilatory sensitivity to hypercapnia, which can be augmented with selective serotonin reuptake inhibition.Using mRNA sequencing, we show that BN rats have reduced medullary raphé expression of multiple 5‐HT neuron‐specific genes, predictive of lower monoamine levels by informatics pathway analyses and confirmed by high‐performance liquid chromatography measurements.BN rats also showed reduced thyrotropin‐releasing hormone (TRH) expression, where injections of the TRH analogue Taltirelin caused greater increases in baseline ventilation, body temperature and the ventilatory CO2chemoreflex in BN rats compared to control Sprague–Dawley rats.These data establish a molecular basis of a neuromodulatory deficiency in BN rats, and further suggest an important functional role for TRH signalling in the mammalian CO2chemoreflex.AbstractRaphé‐derived serotonin (5‐HT) and thyrotropin‐releasing hormone (TRH) play important roles in fundamental, homeostatic control systems such as breathing and specifically the ventilatory CO2chemoreflex. Brown Norway (BN) rats exhibit an inherent and severe ventilatory insensitivity to hypercapnia but also exhibit relatively normal ventilation at rest and during other conditions, similar to multiple genetic models of 5‐HT system dysfunction in mice. Herein, we tested the hypothesis that the ventilatory insensitivity to hypercapnia in BN rats is due to altered raphé gene expression and the consequent deficiencies in raphé‐derived neuromodulators such as TRH. Medullary raphé transcriptome comparisons revealed lower expression of multiple 5‐HT neuron‐specific genes in BN compared to control Dahl salt‐sensitive rats, predictive of reduced central nervous system monoamines by bioinformatics analyses and confirmed by high‐performance liquid chromatography measurements. In particular, raphéTrhmRNA and peptide levels were significantly reduced in BN rats, and injections of the stable TRH analogue Taltirelin (TAL) stimulated breathing dose‐dependently, with greater effects in BNversuscontrol Sprague–Dawley rats. Importantly, TAL also effectively normalized the ventilatory CO2chemoreflex in BN rats, but TAL did not affect CO2sensitivity in control Sprague–Dawley rats. These data establish a molecular basis of the neuromodulatory deficiency in BN rats, and further suggest an important functional role for TRH signalling in the mammalian CO2chemoreflex.
登录
查看更多内容
影响因子:
6.1
作者:
R. Haring;Y. Kloog
通讯作者:
Y. Kloog
DOI:
10.1016/s0021-9258(18)90892-6
发表时间:
1984
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
S. Tzartos;J. Changeux
通讯作者:
J. Changeux
DOI:
10.1016/s0021-9258(18)63878-5
发表时间:
1989
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
J. Herz;David A. Johnson;P. Taylor
通讯作者:
P. Taylor
DOI:
--
发表时间:
1981
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Haggerty,JG;Froehner,SC
通讯作者:
Froehner,SC
DOI:
10.1016/0006-291x(87)91037-0
发表时间:
1987
影响因子:
3.1
作者:
R. Mosckovitz;R. Haring;J. Gershoni;Y. Kloog;M. Sokolovsky
通讯作者:
M. Sokolovsky