Seasonal Shifts in Thyroid Function in the Cotton Rat (Sigmodon hispidus)
Cotton rats (Sigmodon hispidus) were captured in southwestern Missouri in summer and winter, several thyroid parameters were measured, and utilization rates of thyroxine ( T4) and triiodothyronine ( T3) were calculated. In addition, resting metabolic rates were measured seasonally. Animals captured...
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| Veröffentlicht in: | Journal of mammalogy 1994-05, Vol.75 (2), p.520-528 |
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| creator | Tomasi, Thomas E. Mitchell, Dora A. |
| description | Cotton rats (Sigmodon hispidus) were captured in southwestern Missouri in summer and winter, several thyroid parameters were measured, and utilization rates of thyroxine ( T4) and triiodothyronine ( T3) were calculated. In addition, resting metabolic rates were measured seasonally. Animals captured in winter had significantly lower concentrations of serum T4 and greater volumes of distribution than summer-caught rats. The resultant utilization of T4 was lower in winter, while the thyroxine efficiency (oxygen consumed per thyroxine used) was greater. The latter suggests an improved T4-to- T3 deiodination and is consistent with the markedly higher serum T3 observed in winter. Winter cotton rats also had shorter T3 half-lives, greater volumes of T3 distribution, and higher T3 utilization rates. Because resting metabolism was not significantly higher, it is concluded that, while winter may stimulate an increased T4-to- T3 deiodination, the excess T3 is removed from circulation before affecting metabolic rate. |
| doi_str_mv | 10.2307/1382576 |
| format | Article |
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In addition, resting metabolic rates were measured seasonally. Animals captured in winter had significantly lower concentrations of serum T4 and greater volumes of distribution than summer-caught rats. The resultant utilization of T4 was lower in winter, while the thyroxine efficiency (oxygen consumed per thyroxine used) was greater. The latter suggests an improved T4-to- T3 deiodination and is consistent with the markedly higher serum T3 observed in winter. Winter cotton rats also had shorter T3 half-lives, greater volumes of T3 distribution, and higher T3 utilization rates. Because resting metabolism was not significantly higher, it is concluded that, while winter may stimulate an increased T4-to- T3 deiodination, the excess T3 is removed from circulation before affecting metabolic rate.</description><identifier>ISSN: 0022-2372</identifier><identifier>ISSN: 1545-1542</identifier><identifier>EISSN: 1545-1542</identifier><identifier>EISSN: 0022-2372</identifier><identifier>DOI: 10.2307/1382576</identifier><identifier>CODEN: JOMAAL</identifier><language>eng</language><publisher>Provo, UT: American Society of Mammalogists</publisher><subject>Animals ; Biological and medical sciences ; Fundamental and applied biological sciences. Psychology ; Hormone metabolism ; Hormones ; Metabolism ; Physiology ; Rats ; Rodents ; Secretion ; Summer ; Thermoregulation. Hibernation. Estivation. 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In addition, resting metabolic rates were measured seasonally. Animals captured in winter had significantly lower concentrations of serum T4 and greater volumes of distribution than summer-caught rats. The resultant utilization of T4 was lower in winter, while the thyroxine efficiency (oxygen consumed per thyroxine used) was greater. The latter suggests an improved T4-to- T3 deiodination and is consistent with the markedly higher serum T3 observed in winter. Winter cotton rats also had shorter T3 half-lives, greater volumes of T3 distribution, and higher T3 utilization rates. Because resting metabolism was not significantly higher, it is concluded that, while winter may stimulate an increased T4-to- T3 deiodination, the excess T3 is removed from circulation before affecting metabolic rate.</description><subject>Animals</subject><subject>Biological and medical sciences</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Hormone metabolism</subject><subject>Hormones</subject><subject>Metabolism</subject><subject>Physiology</subject><subject>Rats</subject><subject>Rodents</subject><subject>Secretion</subject><subject>Summer</subject><subject>Thermoregulation. Hibernation. Estivation. Ecophysiology and environmental effects</subject><subject>Thyroid</subject><subject>Thyroid function</subject><subject>Thyroid gland</subject><subject>Vertebrates: anatomy and physiology, studies on body, several organs or systems</subject><subject>Winter</subject><subject>Zoology</subject><issn>0022-2372</issn><issn>1545-1542</issn><issn>1545-1542</issn><issn>0022-2372</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1994</creationdate><recordtype>article</recordtype><recordid>eNp1kEFLAzEUhIMoWKv4FxYR1MPqe8km2R5lsVooCLael5DduCntpibZQ_-9KS168vIeM3wMzBByjfBIGcgnZCXlUpyQEfKC5-nQUzICoDSnTNJzchHCCgC4pDAis0WrguvVOlt01sSQ2T5bdjvvbJNNh15H6_q9F7s2q1yMSX2omN0v7NfGNUl1NmxtM4SHS3Jm1Dq0V8c_Jp_Tl2X1ls_fX2fV8zzXDMqYK66FNI2gjVGlkaJAJdFoZDjhyJlAyYQUAqAVDAUFQCOhaDhvTGqlFRuTm0Pu1rvvoQ2xXrnBpwahphQLXpQlT9DdAdLeheBbU2-93Si_qxHq_Uz1caZE3h7jVNBqbbzqtQ2_eIEMJiX-YasQnf837QdiCG6i</recordid><startdate>19940531</startdate><enddate>19940531</enddate><creator>Tomasi, Thomas E.</creator><creator>Mitchell, Dora A.</creator><general>American Society of Mammalogists</general><general>Brigham Young University, Department of Zoology</general><general>Oxford University Press</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7SN</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>K9.</scope><scope>P64</scope><scope>RC3</scope></search><sort><creationdate>19940531</creationdate><title>Seasonal Shifts in Thyroid Function in the Cotton Rat (Sigmodon hispidus)</title><author>Tomasi, Thomas E. ; Mitchell, Dora A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c308t-a5c67fd62dfa8f7641a71fc131951536173676600e63162001f704d55df576ca3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1994</creationdate><topic>Animals</topic><topic>Biological and medical sciences</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Hormone metabolism</topic><topic>Hormones</topic><topic>Metabolism</topic><topic>Physiology</topic><topic>Rats</topic><topic>Rodents</topic><topic>Secretion</topic><topic>Summer</topic><topic>Thermoregulation. Hibernation. Estivation. Ecophysiology and environmental effects</topic><topic>Thyroid</topic><topic>Thyroid function</topic><topic>Thyroid gland</topic><topic>Vertebrates: anatomy and physiology, studies on body, several organs or systems</topic><topic>Winter</topic><topic>Zoology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tomasi, Thomas E.</creatorcontrib><creatorcontrib>Mitchell, Dora A.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Animal Behavior Abstracts</collection><collection>Ecology Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><jtitle>Journal of mammalogy</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tomasi, Thomas E.</au><au>Mitchell, Dora A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Seasonal Shifts in Thyroid Function in the Cotton Rat (Sigmodon hispidus)</atitle><jtitle>Journal of mammalogy</jtitle><date>1994-05-31</date><risdate>1994</risdate><volume>75</volume><issue>2</issue><spage>520</spage><epage>528</epage><pages>520-528</pages><issn>0022-2372</issn><issn>1545-1542</issn><eissn>1545-1542</eissn><eissn>0022-2372</eissn><coden>JOMAAL</coden><abstract>Cotton rats (Sigmodon hispidus) were captured in southwestern Missouri in summer and winter, several thyroid parameters were measured, and utilization rates of thyroxine ( T4) and triiodothyronine ( T3) were calculated. In addition, resting metabolic rates were measured seasonally. Animals captured in winter had significantly lower concentrations of serum T4 and greater volumes of distribution than summer-caught rats. The resultant utilization of T4 was lower in winter, while the thyroxine efficiency (oxygen consumed per thyroxine used) was greater. The latter suggests an improved T4-to- T3 deiodination and is consistent with the markedly higher serum T3 observed in winter. Winter cotton rats also had shorter T3 half-lives, greater volumes of T3 distribution, and higher T3 utilization rates. Because resting metabolism was not significantly higher, it is concluded that, while winter may stimulate an increased T4-to- T3 deiodination, the excess T3 is removed from circulation before affecting metabolic rate.</abstract><cop>Provo, UT</cop><pub>American Society of Mammalogists</pub><doi>10.2307/1382576</doi><tpages>9</tpages></addata></record> |
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| ispartof | Journal of mammalogy, 1994-05, Vol.75 (2), p.520-528 |
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| source | Oxford University Press Journals Digital Archive Legacy; JSTOR Archive Collection A-Z Listing |
| subjects | Animals Biological and medical sciences Fundamental and applied biological sciences. Psychology Hormone metabolism Hormones Metabolism Physiology Rats Rodents Secretion Summer Thermoregulation. Hibernation. Estivation. Ecophysiology and environmental effects Thyroid Thyroid function Thyroid gland Vertebrates: anatomy and physiology, studies on body, several organs or systems Winter Zoology |
| title | Seasonal Shifts in Thyroid Function in the Cotton Rat (Sigmodon hispidus) |
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