Age-dependent slowing of enteric axonal transport in insulin-resistant mice
To investigate retrograde tracer transport by gastric enteric neurons in insulin resistant mice with low or high glycosylated hemoglobin (Hb). Under anesthesia, the retrograde tracer fluorogold was superficially injected into the fundus or antrum using a microsyringe in KK Cg-Ay/J mice prior to onse...
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| Veröffentlicht in: | World journal of gastroenterology : WJG 2013-01, Vol.19 (4), p.482-491 |
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| description | To investigate retrograde tracer transport by gastric enteric neurons in insulin resistant mice with low or high glycosylated hemoglobin (Hb).
Under anesthesia, the retrograde tracer fluorogold was superficially injected into the fundus or antrum using a microsyringe in KK Cg-Ay/J mice prior to onset of type 2 diabetes mellitus (T2DM; 4 wk of age), at onset of T2DM (8 wk of age), and after 8, 16, or 24 wk of untreated T2DM and in age-matched KK/HIJ mice. Six days later, mice were sacrificed by CO₂ narcosis followed by pneumothorax. Stomachs were removed and fixed. Sections from fundus, corpus and antrum were excised and mounted on a glass slide. Tracer-labeled neurons were viewed using a microscope and manually counted. Data were expressed as the number of neurons in short and long descending and ascending pathways and in local fundus and antrum pathways, and the number of neurons in all regions labeled after injection of tracer into either the fundus or the antrum.
By 8 wk of age, body weights of KKAy mice (n = 12, 34 ± 1 g) were heavier than KK mice (n = 17, 29 ± 1 g; F (4, 120) = 4.414, P = 0.002] and glycosylated Hb was higher [KK: (n = 7), 4.97% ± 0.04%; KKAy: (n = 6), 6.57% ± 0.47%; F (1, 26) = 24.748, P < 0.001]. The number of tracer labeled enteric neurons was similar in KK and KKAy mice of all ages in the short descending pathway [F (1, 57) = 2.374, P = 0.129], long descending pathway [F (1, 57) = 0.922, P = 0.341], local fundus pathway [F (1, 53) = 2.464, P = 0.122], local antrum pathway [F (1, 57) = 0.728, P = 0.397], and short ascending pathway [F (1, 53) = 2.940, P = 0.092]. In the long ascending pathway, fewer tracer-labeled neurons were present in KKAy as compared to KK mice [KK: (n = 34), 302 ± 17; KKAy: (n = 29), 230 ± 15; F (1, 53) = 8.136, P = 0.006]. The number of tracer-labeled neurons was decreased in all mice by 16 wk as compared to 8 wk of age in the short descending pathway [8 wk: (n = 15), 305 ± 26; 16 wk: (n = 13), 210 ± 30; F (4, 57) = 9.336, P < 0.001], local antrum pathway [8 wk: (n = 15), 349 ± 20; 16 wk: (n = 13), 220 ± 33; F (4, 57) = 8.920, P < 0.001], short ascending pathway [8 wk: (n = 14), 392 ± 15; 16 wk: (n = 14), 257 ± 33; F (4, 53) = 17.188, P < 0.001], and long ascending pathway [8 wk: (n = 14), 379 ± 39; 16 wk: (n = 14), 235 ± 26; F (4, 53) = 24.936, P < 0.001. The number of tracer-labeled neurons decreased at 24 wk of age in the local fundus pathway [8 wk: (n = 14), 33 ± 11; 24 wk: (n = 12), 3 ± 2; F (4, 53) = 5. |
| doi_str_mv | 10.3748/wjg.v19.i4.482 |
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Under anesthesia, the retrograde tracer fluorogold was superficially injected into the fundus or antrum using a microsyringe in KK Cg-Ay/J mice prior to onset of type 2 diabetes mellitus (T2DM; 4 wk of age), at onset of T2DM (8 wk of age), and after 8, 16, or 24 wk of untreated T2DM and in age-matched KK/HIJ mice. Six days later, mice were sacrificed by CO₂ narcosis followed by pneumothorax. Stomachs were removed and fixed. Sections from fundus, corpus and antrum were excised and mounted on a glass slide. Tracer-labeled neurons were viewed using a microscope and manually counted. Data were expressed as the number of neurons in short and long descending and ascending pathways and in local fundus and antrum pathways, and the number of neurons in all regions labeled after injection of tracer into either the fundus or the antrum.
By 8 wk of age, body weights of KKAy mice (n = 12, 34 ± 1 g) were heavier than KK mice (n = 17, 29 ± 1 g; F (4, 120) = 4.414, P = 0.002] and glycosylated Hb was higher [KK: (n = 7), 4.97% ± 0.04%; KKAy: (n = 6), 6.57% ± 0.47%; F (1, 26) = 24.748, P < 0.001]. The number of tracer labeled enteric neurons was similar in KK and KKAy mice of all ages in the short descending pathway [F (1, 57) = 2.374, P = 0.129], long descending pathway [F (1, 57) = 0.922, P = 0.341], local fundus pathway [F (1, 53) = 2.464, P = 0.122], local antrum pathway [F (1, 57) = 0.728, P = 0.397], and short ascending pathway [F (1, 53) = 2.940, P = 0.092]. In the long ascending pathway, fewer tracer-labeled neurons were present in KKAy as compared to KK mice [KK: (n = 34), 302 ± 17; KKAy: (n = 29), 230 ± 15; F (1, 53) = 8.136, P = 0.006]. The number of tracer-labeled neurons was decreased in all mice by 16 wk as compared to 8 wk of age in the short descending pathway [8 wk: (n = 15), 305 ± 26; 16 wk: (n = 13), 210 ± 30; F (4, 57) = 9.336, P < 0.001], local antrum pathway [8 wk: (n = 15), 349 ± 20; 16 wk: (n = 13), 220 ± 33; F (4, 57) = 8.920, P < 0.001], short ascending pathway [8 wk: (n = 14), 392 ± 15; 16 wk: (n = 14), 257 ± 33; F (4, 53) = 17.188, P < 0.001], and long ascending pathway [8 wk: (n = 14), 379 ± 39; 16 wk: (n = 14), 235 ± 26; F (4, 53) = 24.936, P < 0.001. The number of tracer-labeled neurons decreased at 24 wk of age in the local fundus pathway [8 wk: (n = 14), 33 ± 11; 24 wk: (n = 12), 3 ± 2; F (4, 53) = 5.195, P = 0.001] and 32 wk of age in the long descending pathway [8 wk: (n = 15), 16 ± 3; 32 wk: (n = 12), 3 ± 2; F (4, 57) = 2.944, P = 0.028]. The number of tracer-labeled enteric neurons was correlated to final body weight for local fundus and ascending pathways [KK: (n = 34), r = -0.746, P < 0.001; KKAy: (n = 29), r = -0.842, P < 0.001] as well as local antrum and descending pathways [KK (n = 36), r = -0.660, P < 0.001; KKAy (n = 31), r = -0.622, P < 0.001). In contrast, glycosylated Hb was not significantly correlated to number of tracer-labeled neurons [KK (n = 17), r = -0.164, P = 0.528; KKAy (n = 16), r = -0.078, P = 0.774].
Since uncontrolled T2DM did not uniformly impair tracer transport in gastric neurons, long ascending neurons may be more susceptible to persistent hyperglycemia and low effective insulin.]]></description><identifier>ISSN: 1007-9327</identifier><identifier>EISSN: 2219-2840</identifier><identifier>DOI: 10.3748/wjg.v19.i4.482</identifier><identifier>PMID: 23382626</identifier><language>eng</language><publisher>United States: Baishideng Publishing Group Co., Limited</publisher><subject>Age Factors ; Aging ; Animals ; Axonal Transport ; Biomarkers - blood ; Blood Glucose - metabolism ; Body Weight ; Diabetes Mellitus, Type 2 - blood ; Diabetes Mellitus, Type 2 - genetics ; Diabetes Mellitus, Type 2 - physiopathology ; Diabetic Neuropathies - blood ; Diabetic Neuropathies - genetics ; Diabetic Neuropathies - physiopathology ; Disease Models, Animal ; Enteric Nervous System - metabolism ; Enteric Nervous System - physiopathology ; Female ; Glycated Hemoglobin A - metabolism ; Insulin Resistance ; Mice ; Neural Pathways - metabolism ; Neural Pathways - physiopathology ; Neuroanatomical Tract-Tracing Techniques ; Neuronal Tract-Tracers - metabolism ; Original ; Stilbamidines - metabolism ; Stomach - innervation</subject><ispartof>World journal of gastroenterology : WJG, 2013-01, Vol.19 (4), p.482-491</ispartof><rights>2013 Baishideng Publishing Group Co., Limited. All rights reserved. 2013</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC3558571/pdf/$$EPDF$$P50$$Gpubmedcentral$$H</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC3558571/$$EHTML$$P50$$Gpubmedcentral$$H</linktohtml><link.rule.ids>230,314,723,776,780,881,27903,27904,53770,53772</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/23382626$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>LePard, Kathy J</creatorcontrib><creatorcontrib>Cellini, Joseph</creatorcontrib><title>Age-dependent slowing of enteric axonal transport in insulin-resistant mice</title><title>World journal of gastroenterology : WJG</title><addtitle>World J Gastroenterol</addtitle><description><![CDATA[To investigate retrograde tracer transport by gastric enteric neurons in insulin resistant mice with low or high glycosylated hemoglobin (Hb).
Under anesthesia, the retrograde tracer fluorogold was superficially injected into the fundus or antrum using a microsyringe in KK Cg-Ay/J mice prior to onset of type 2 diabetes mellitus (T2DM; 4 wk of age), at onset of T2DM (8 wk of age), and after 8, 16, or 24 wk of untreated T2DM and in age-matched KK/HIJ mice. Six days later, mice were sacrificed by CO₂ narcosis followed by pneumothorax. Stomachs were removed and fixed. Sections from fundus, corpus and antrum were excised and mounted on a glass slide. Tracer-labeled neurons were viewed using a microscope and manually counted. Data were expressed as the number of neurons in short and long descending and ascending pathways and in local fundus and antrum pathways, and the number of neurons in all regions labeled after injection of tracer into either the fundus or the antrum.
By 8 wk of age, body weights of KKAy mice (n = 12, 34 ± 1 g) were heavier than KK mice (n = 17, 29 ± 1 g; F (4, 120) = 4.414, P = 0.002] and glycosylated Hb was higher [KK: (n = 7), 4.97% ± 0.04%; KKAy: (n = 6), 6.57% ± 0.47%; F (1, 26) = 24.748, P < 0.001]. The number of tracer labeled enteric neurons was similar in KK and KKAy mice of all ages in the short descending pathway [F (1, 57) = 2.374, P = 0.129], long descending pathway [F (1, 57) = 0.922, P = 0.341], local fundus pathway [F (1, 53) = 2.464, P = 0.122], local antrum pathway [F (1, 57) = 0.728, P = 0.397], and short ascending pathway [F (1, 53) = 2.940, P = 0.092]. In the long ascending pathway, fewer tracer-labeled neurons were present in KKAy as compared to KK mice [KK: (n = 34), 302 ± 17; KKAy: (n = 29), 230 ± 15; F (1, 53) = 8.136, P = 0.006]. The number of tracer-labeled neurons was decreased in all mice by 16 wk as compared to 8 wk of age in the short descending pathway [8 wk: (n = 15), 305 ± 26; 16 wk: (n = 13), 210 ± 30; F (4, 57) = 9.336, P < 0.001], local antrum pathway [8 wk: (n = 15), 349 ± 20; 16 wk: (n = 13), 220 ± 33; F (4, 57) = 8.920, P < 0.001], short ascending pathway [8 wk: (n = 14), 392 ± 15; 16 wk: (n = 14), 257 ± 33; F (4, 53) = 17.188, P < 0.001], and long ascending pathway [8 wk: (n = 14), 379 ± 39; 16 wk: (n = 14), 235 ± 26; F (4, 53) = 24.936, P < 0.001. The number of tracer-labeled neurons decreased at 24 wk of age in the local fundus pathway [8 wk: (n = 14), 33 ± 11; 24 wk: (n = 12), 3 ± 2; F (4, 53) = 5.195, P = 0.001] and 32 wk of age in the long descending pathway [8 wk: (n = 15), 16 ± 3; 32 wk: (n = 12), 3 ± 2; F (4, 57) = 2.944, P = 0.028]. The number of tracer-labeled enteric neurons was correlated to final body weight for local fundus and ascending pathways [KK: (n = 34), r = -0.746, P < 0.001; KKAy: (n = 29), r = -0.842, P < 0.001] as well as local antrum and descending pathways [KK (n = 36), r = -0.660, P < 0.001; KKAy (n = 31), r = -0.622, P < 0.001). In contrast, glycosylated Hb was not significantly correlated to number of tracer-labeled neurons [KK (n = 17), r = -0.164, P = 0.528; KKAy (n = 16), r = -0.078, P = 0.774].
Since uncontrolled T2DM did not uniformly impair tracer transport in gastric neurons, long ascending neurons may be more susceptible to persistent hyperglycemia and low effective insulin.]]></description><subject>Age Factors</subject><subject>Aging</subject><subject>Animals</subject><subject>Axonal Transport</subject><subject>Biomarkers - blood</subject><subject>Blood Glucose - metabolism</subject><subject>Body Weight</subject><subject>Diabetes Mellitus, Type 2 - blood</subject><subject>Diabetes Mellitus, Type 2 - genetics</subject><subject>Diabetes Mellitus, Type 2 - physiopathology</subject><subject>Diabetic Neuropathies - blood</subject><subject>Diabetic Neuropathies - genetics</subject><subject>Diabetic Neuropathies - physiopathology</subject><subject>Disease Models, Animal</subject><subject>Enteric Nervous System - metabolism</subject><subject>Enteric Nervous System - physiopathology</subject><subject>Female</subject><subject>Glycated Hemoglobin A - metabolism</subject><subject>Insulin Resistance</subject><subject>Mice</subject><subject>Neural Pathways - metabolism</subject><subject>Neural Pathways - physiopathology</subject><subject>Neuroanatomical Tract-Tracing Techniques</subject><subject>Neuronal Tract-Tracers - metabolism</subject><subject>Original</subject><subject>Stilbamidines - metabolism</subject><subject>Stomach - innervation</subject><issn>1007-9327</issn><issn>2219-2840</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpVUU1LxDAQDaK46-rVo_TopTWfTXoRlsUvXPCi55C2ac3SJmvS7uq_N7LrojAwDDPvzeM9AC4RzAin4ma7arMNKjJDMyrwEZhijIoUCwqPwRRByNOCYD4BZyGsIMSEMHwKJrELnON8Cp7nrU5rvda21nZIQue2xraJa5I4am-qRH06q7pk8MqGtfNDYmysMHbGpl4HEwYVgb2p9Dk4aVQX9MW-z8Db_d3r4jFdvjw8LebLtCKUDSkXNYOI64pTyqhqoOAkb3ItyqYoISGYsAbWCFINC1VDkhNUQi7ymotClUVOZuB2x7sey17XVVTqVSfX3vTKf0mnjPy_seZdtm4jCWOCcRQJrvcE3n2MOgyyN6HSXaesdmOQKPqXY4KilBnIdqeVdyF43RzeICh_EpAxARkTkIbKmEAEXP0Vdzj_tZx8AwEIg-0</recordid><startdate>20130128</startdate><enddate>20130128</enddate><creator>LePard, Kathy J</creator><creator>Cellini, Joseph</creator><general>Baishideng Publishing Group Co., Limited</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>5PM</scope></search><sort><creationdate>20130128</creationdate><title>Age-dependent slowing of enteric axonal transport in insulin-resistant mice</title><author>LePard, Kathy J ; Cellini, Joseph</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c345t-78d5017ec74454af08736f6e8bf9b033235f0d104e09ad03631b0786d789ab963</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Age Factors</topic><topic>Aging</topic><topic>Animals</topic><topic>Axonal Transport</topic><topic>Biomarkers - blood</topic><topic>Blood Glucose - metabolism</topic><topic>Body Weight</topic><topic>Diabetes Mellitus, Type 2 - blood</topic><topic>Diabetes Mellitus, Type 2 - genetics</topic><topic>Diabetes Mellitus, Type 2 - physiopathology</topic><topic>Diabetic Neuropathies - blood</topic><topic>Diabetic Neuropathies - genetics</topic><topic>Diabetic Neuropathies - physiopathology</topic><topic>Disease Models, Animal</topic><topic>Enteric Nervous System - metabolism</topic><topic>Enteric Nervous System - physiopathology</topic><topic>Female</topic><topic>Glycated Hemoglobin A - metabolism</topic><topic>Insulin Resistance</topic><topic>Mice</topic><topic>Neural Pathways - metabolism</topic><topic>Neural Pathways - physiopathology</topic><topic>Neuroanatomical Tract-Tracing Techniques</topic><topic>Neuronal Tract-Tracers - metabolism</topic><topic>Original</topic><topic>Stilbamidines - metabolism</topic><topic>Stomach - innervation</topic><toplevel>online_resources</toplevel><creatorcontrib>LePard, Kathy J</creatorcontrib><creatorcontrib>Cellini, Joseph</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>World journal of gastroenterology : WJG</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>LePard, Kathy J</au><au>Cellini, Joseph</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Age-dependent slowing of enteric axonal transport in insulin-resistant mice</atitle><jtitle>World journal of gastroenterology : WJG</jtitle><addtitle>World J Gastroenterol</addtitle><date>2013-01-28</date><risdate>2013</risdate><volume>19</volume><issue>4</issue><spage>482</spage><epage>491</epage><pages>482-491</pages><issn>1007-9327</issn><eissn>2219-2840</eissn><abstract><![CDATA[To investigate retrograde tracer transport by gastric enteric neurons in insulin resistant mice with low or high glycosylated hemoglobin (Hb).
Under anesthesia, the retrograde tracer fluorogold was superficially injected into the fundus or antrum using a microsyringe in KK Cg-Ay/J mice prior to onset of type 2 diabetes mellitus (T2DM; 4 wk of age), at onset of T2DM (8 wk of age), and after 8, 16, or 24 wk of untreated T2DM and in age-matched KK/HIJ mice. Six days later, mice were sacrificed by CO₂ narcosis followed by pneumothorax. Stomachs were removed and fixed. Sections from fundus, corpus and antrum were excised and mounted on a glass slide. Tracer-labeled neurons were viewed using a microscope and manually counted. Data were expressed as the number of neurons in short and long descending and ascending pathways and in local fundus and antrum pathways, and the number of neurons in all regions labeled after injection of tracer into either the fundus or the antrum.
By 8 wk of age, body weights of KKAy mice (n = 12, 34 ± 1 g) were heavier than KK mice (n = 17, 29 ± 1 g; F (4, 120) = 4.414, P = 0.002] and glycosylated Hb was higher [KK: (n = 7), 4.97% ± 0.04%; KKAy: (n = 6), 6.57% ± 0.47%; F (1, 26) = 24.748, P < 0.001]. The number of tracer labeled enteric neurons was similar in KK and KKAy mice of all ages in the short descending pathway [F (1, 57) = 2.374, P = 0.129], long descending pathway [F (1, 57) = 0.922, P = 0.341], local fundus pathway [F (1, 53) = 2.464, P = 0.122], local antrum pathway [F (1, 57) = 0.728, P = 0.397], and short ascending pathway [F (1, 53) = 2.940, P = 0.092]. In the long ascending pathway, fewer tracer-labeled neurons were present in KKAy as compared to KK mice [KK: (n = 34), 302 ± 17; KKAy: (n = 29), 230 ± 15; F (1, 53) = 8.136, P = 0.006]. The number of tracer-labeled neurons was decreased in all mice by 16 wk as compared to 8 wk of age in the short descending pathway [8 wk: (n = 15), 305 ± 26; 16 wk: (n = 13), 210 ± 30; F (4, 57) = 9.336, P < 0.001], local antrum pathway [8 wk: (n = 15), 349 ± 20; 16 wk: (n = 13), 220 ± 33; F (4, 57) = 8.920, P < 0.001], short ascending pathway [8 wk: (n = 14), 392 ± 15; 16 wk: (n = 14), 257 ± 33; F (4, 53) = 17.188, P < 0.001], and long ascending pathway [8 wk: (n = 14), 379 ± 39; 16 wk: (n = 14), 235 ± 26; F (4, 53) = 24.936, P < 0.001. The number of tracer-labeled neurons decreased at 24 wk of age in the local fundus pathway [8 wk: (n = 14), 33 ± 11; 24 wk: (n = 12), 3 ± 2; F (4, 53) = 5.195, P = 0.001] and 32 wk of age in the long descending pathway [8 wk: (n = 15), 16 ± 3; 32 wk: (n = 12), 3 ± 2; F (4, 57) = 2.944, P = 0.028]. The number of tracer-labeled enteric neurons was correlated to final body weight for local fundus and ascending pathways [KK: (n = 34), r = -0.746, P < 0.001; KKAy: (n = 29), r = -0.842, P < 0.001] as well as local antrum and descending pathways [KK (n = 36), r = -0.660, P < 0.001; KKAy (n = 31), r = -0.622, P < 0.001). In contrast, glycosylated Hb was not significantly correlated to number of tracer-labeled neurons [KK (n = 17), r = -0.164, P = 0.528; KKAy (n = 16), r = -0.078, P = 0.774].
Since uncontrolled T2DM did not uniformly impair tracer transport in gastric neurons, long ascending neurons may be more susceptible to persistent hyperglycemia and low effective insulin.]]></abstract><cop>United States</cop><pub>Baishideng Publishing Group Co., Limited</pub><pmid>23382626</pmid><doi>10.3748/wjg.v19.i4.482</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Age Factors Aging Animals Axonal Transport Biomarkers - blood Blood Glucose - metabolism Body Weight Diabetes Mellitus, Type 2 - blood Diabetes Mellitus, Type 2 - genetics Diabetes Mellitus, Type 2 - physiopathology Diabetic Neuropathies - blood Diabetic Neuropathies - genetics Diabetic Neuropathies - physiopathology Disease Models, Animal Enteric Nervous System - metabolism Enteric Nervous System - physiopathology Female Glycated Hemoglobin A - metabolism Insulin Resistance Mice Neural Pathways - metabolism Neural Pathways - physiopathology Neuroanatomical Tract-Tracing Techniques Neuronal Tract-Tracers - metabolism Original Stilbamidines - metabolism Stomach - innervation |
| title | Age-dependent slowing of enteric axonal transport in insulin-resistant mice |
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