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Farmer G, Bachelor M, Cunningham J. Angiotensin II Signaling in the Median Preoptic Nucleus Persists in Renin KO Rats: an in vitro Sniffer Cell Study. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.02864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- George Farmer
- Anatomy and PhysiologyUNT Health Science CenterFort WorthTX
| | | | - J. Cunningham
- Anatomy and PhysiologyUNT Health Science CenterFort WorthTX
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Brock C, Bachelor M, Little J, Farmer G, Balaptattabi K, Cunningham J. Sex Specific Effects of Salt Loading in Oxytocin Neurons From The Supraoptic Nucleus. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.03296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Courtney Brock
- Physiology and AnatomyUniversity of North Texas Health Science CenterFort WorthTX
| | - Martha Bachelor
- Physiology and AnatomyUniversity of North Texas Health Science CenterFort WorthTX
| | - Joel Little
- Physiology and AnatomyUniversity of North Texas Health Science CenterFort WorthTX
| | - George Farmer
- Physiology and AnatomyUniversity of North Texas Health Science CenterFort WorthTX
| | | | - J. Cunningham
- Physiology and AnatomyUniversity of North Texas Health Science CenterFort WorthTX
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Balapattabi K, Little JT, Bachelor M, Cunningham JT. Brain-Derived Neurotrophic Factor and Supraoptic Vasopressin Neurons in Hyponatremia. Neuroendocrinology 2019; 110:630-641. [PMID: 31557760 PMCID: PMC7385921 DOI: 10.1159/000503723] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 09/24/2019] [Accepted: 09/24/2019] [Indexed: 12/16/2022]
Abstract
Hyponatremia due to elevated arginine vasopressin (AVP) secretion increases mortality in liver failure patients. The mechanisms causing dysregulation of AVP secretion are unknown. Our hypothesis is that inappropriate AVP release associated with liver failure is due to increased brain-derived neurotrophic factor (BDNF) in the supraoptic nucleus (SON). BDNF diminishes GABAA inhibition in SON AVP neurons by increasing intracellular chloride through tyrosine receptor kinase B (TrkB) activation and downregulation of K+/Cl- cotransporter 2 (KCC2). This loss of inhibition could increase AVP secretion. This hypothesis was tested using shRNA against BDNF (shBDNF) in the SON in bile duct ligated (BDL) male rats. All BDL rats had significantly increased liver weight (p < 0.05; 6-9) compared to shams. BDL rats with control -shRNA injections (BDL scrambled [SCR]) developed hyponatremia with increased plasma AVP and copeptin (CPP; all p < 0.05; 6-9) compared to sham groups. This is the first study to show that phosphorylation of TrkB is significantly increased along with significant decrease in phosphorylation of KCC2 in BDL SCR rats compared to the sham rats (p < 0.05;6-8). Knockdown of BDNF in the SON of BDL rats (BDL shBDNF) significantly increased plasma osmolality and hematocrit compared to BDL SCR rats (p < 0.05; 6-9). The BDL shBDNF rats had significant (p < 0.05; 6-9) decreases in plasma AVP and CPP concentration compared to BDL SCR rats. The BDNF knockdown also significantly blocked the increase in TrkB phosphorylation and decrease in KCC2 phosphorylation (p < 0.05; 6-8). The results indicate that BDNF produced in the SON contributes to increased AVP secretion and hyponatremia during liver failure.
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Affiliation(s)
- Kirthikaa Balapattabi
- Department of Physiology and Anatomy, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas, USA
| | - Joel T Little
- Department of Physiology and Anatomy, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas, USA
| | - Martha Bachelor
- Department of Physiology and Anatomy, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas, USA
| | - J Thomas Cunningham
- Department of Physiology and Anatomy, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas, USA,
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Balapattabi K, Farmer GE, Knapp BA, Little JT, Bachelor M, Yuan JP, Cunningham JT. Effects of salt-loading on supraoptic vasopressin neurones assessed by ClopHensorN chloride imaging. J Neuroendocrinol 2019; 31:e12752. [PMID: 31136029 PMCID: PMC7041405 DOI: 10.1111/jne.12752] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 05/16/2019] [Accepted: 05/23/2019] [Indexed: 12/13/2022]
Abstract
Salt-loading (SL) impairs GABAA inhibition of arginine vasopressin (AVP) neurones in the supraoptic nucleus (SON) of the hypothalamus. Based on previous studies, we hypothesised that SL activates tyrosine receptor kinase B (TrkB), down-regulating the activity of K+ /Cl- co-transporter2 (KCC2) and up-regulating Na+ /K+ /Cl- co-transporter1 (NKCC1). These changes in chloride transport would result in increased [Cl- ]i in SON AVP neurones. The study combined virally-mediated chloride imaging with ClopHensorN with a single-cell western blot analysis. An adeno-associated virus with ClopHensorN and a vasopressin promoter (AAV2-0VP1-ClopHensorN) was bilaterally injected in the SON of adult male Sprague-Dawley rats that were either euhydrated (Eu) or salt-loaded (SL) for 7 days. Acutely dissociated SON neurones expressing ClopHensorN were tested for decreases or increases in [Cl- ]i in response to focal application of the GABAA agonist muscimol (100 μmol L-1 ). SON AVP neurones from Eu rats showed muscimol-induced chloride influx (P < 0.05;23/35). SON AVP neurones from SL rats either significantly increased chloride efflux (P < 0.05;27/39) or did not change chloride flux (12/39). The SON AVP neurones that responded to muscimol appeared to be viable and expressed KCC2 and β-actin. Neurones that did not respond during chloride imaging did not show KCC2 and β-actin protein expression. The KCC2 antagonist (VU0240551,10 μmol L-1 ) significantly blocked the chloride influx in cells from Eu rats but did not affect cells from SL rats. A NKCC1 antagonist (bumetanide,10 μmol L-1 ) significantly blocked the chloride efflux in cells from SL rats but had no effect on cells from Eu rats. Blocking NKCC1 using bumetanide had less of an effect on the muscimol-induced Cl- influx in Eu rat neurones compared to the KCC2 antagonist. The TrkB antagonist (AnA-12) (50 μmol L-1 ) and protein kinase inhibitor (K252a) (100 nmol L-1 ) each significantly blocked chloride efflux in SON AVP neurones from SL rats. Salt-loading increases [Cl- ]i in SON AVP neurones via a TrKB-KCC2-NKCC1-dependent mechanism in rats.
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Affiliation(s)
- Kirthikaa Balapattabi
- Department of Physiology and Anatomy, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas
| | - George E Farmer
- Department of Physiology and Anatomy, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas
| | - Blayne A Knapp
- Department of Physiology and Anatomy, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas
| | - Joel T Little
- Department of Physiology and Anatomy, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas
| | - Martha Bachelor
- Department of Physiology and Anatomy, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas
| | - Joseph P Yuan
- Department of Physiology and Anatomy, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas
| | - J Thomas Cunningham
- Department of Physiology and Anatomy, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas
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Bachelor M, Guntur K, Oldach J, Hayden P. 715 Development of a do-it-yourself skin equivalent system for use as a research tool. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Bachelor M, Breyfogle B, Klausner M. 1252 Measurement of skin pigmentation using a chromameter in a 3-dimensional epidermal model containing functional melanocytes. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.1267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Johnson M, Villani T, Bachelor M, Oldach J, Gardner G. 696 Three dimensional IHC characterization of aging in 3D skin models. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Bachelor M, Guntur K, Plotkin A, Oldach J, Armento A. 460 Development of an in vitro method to evaluate the skin hydration potential of topical formulations. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Breyfogle B, Oldach J, Hayden P, Klausner M, Kandarova H, Bachelor M. Evaluation of inflammatory and genotoxic effects of smokeless tobacco using an organotypic model of human oral epithelium. Toxicol Lett 2016. [DOI: 10.1016/j.toxlet.2016.06.1320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kandarova H, Willoughby J, de Jong W, Bachelor M, Letasiova S, Breyfogle B, de la Fonteyne L, Coleman K. Development, optimization and standardization of an in vitro skin irritation test for medical devices using the reconstructed human tissue model epiderm. Toxicol Lett 2015. [DOI: 10.1016/j.toxlet.2015.08.1004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Sebova K, Bachelor M, Klausner M, Hayden P, Oldach J, Stolper G, Li M. A novel assay for evaluating wound healing in a full-thickness in vitro human skin model. Toxicol Lett 2015. [DOI: 10.1016/j.toxlet.2015.08.537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Saxena A, Bachelor M, Park YH, Carreno FR, Nedungadi TP, Cunningham JT. Angiotensin II induces membrane trafficking of natively expressed transient receptor potential vanilloid type 4 channels in hypothalamic 4B cells. Am J Physiol Regul Integr Comp Physiol 2014; 307:R945-55. [PMID: 25080500 DOI: 10.1152/ajpregu.00224.2014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Transient receptor potential vanilloid family type 4 (TRPV4) channels are expressed in central neuroendocrine neurons and have been shown to be polymodal in other systems. We previously reported that in the rodent, a model of dilutional hyponatremia associated with hepatic cirrhosis, TRPV4 expression is increased in lipid rafts from the hypothalamus and that this effect may be angiotensin dependent. In this study, we utilized the immortalized neuroendocrine rat hypothalamic 4B cell line to more directly test the effects of angiotensin II (ANG II) on TRPV4 expression and function. Our results demonstrate the expression of corticotropin-releasing factor (CRF) transcripts, for sex-determining region Y (SRY) (male genotype), arginine vasopressin (AVP), TRPV4, and ANG II type 1a and 1b receptor in 4B cells. After a 1-h incubation in ANG II (100 nM), 4B cells showed increased TRPV4 abundance in the plasma membrane fraction, and this effect was prevented by the ANG II type 1 receptor antagonist losartan (1 μM) and by a Src kinase inhibitor PP2 (10 μM). Ratiometric calcium imaging experiments demonstrated that ANG II incubation potentiated TRPV4 agonist (GSK 1016790A, 20 nM)-induced calcium influx (control 18.4 ± 2.8% n = 5 and ANG II 80.5 ± 2.4% n = 5). This ANG II-induced increase in calcium influx was also blocked by 1 μM losartan and 10 μM PP2 (losartan 26.4 ± 3.8% n = 5 and PP2 19.7 ± 3.9% n = 5). Our data suggests that ANG II can increase TRPV4 channel membrane expression in 4B cells through its action on AT1R involving a Src kinase pathway.
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Affiliation(s)
- Ashwini Saxena
- Department of Integrative Physiology and Anatomy and Cardiovascular Research Institute, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas
| | - Martha Bachelor
- Department of Integrative Physiology and Anatomy and Cardiovascular Research Institute, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas
| | - Yong H Park
- Department of Pharmacology and Neuroscience & North Texas Eye Research Institute, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas; and
| | - Flavia R Carreno
- Department of Pharmacology & Center for Biomedical Neuroscience, University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - T Prashant Nedungadi
- Department of Integrative Physiology and Anatomy and Cardiovascular Research Institute, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas
| | - J Thomas Cunningham
- Department of Integrative Physiology and Anatomy and Cardiovascular Research Institute, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas;
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Saxena A, Bachelor M, Carreno F, Cunningham J. Src‐kinase mediates angiotensin II‐induced potentiation in TRPV4 agonist‐evoked calcium transients in hypothalamic immortalized neuronal cell line 4B (860.25). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.860.25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ashwini Saxena
- Integrative Physiology University of North Texas Health Science CenterFort WorthTXUnited States
| | - Martha Bachelor
- Integrative Physiology University of North Texas Health Science CenterFort WorthTXUnited States
| | - Flavia Carreno
- University of Texas Health Science Center at SAN ANTONIOSan AntonioTXUnited States
| | - J Cunningham
- Integrative Physiology University of North Texas Health Science CenterFort WorthTXUnited States
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Saxena A, Nedungadi TP, Bachelor M, Carreno FR, Cunningham JT. Effect of Angiotensin on TRPV4 expression and TRPV4 agonist induced calcium transients in Hypothalamic cell line 4B. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.694.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ashwini Saxena
- Integrative PhysiologyUniversity of North Texas Health Science CenterFort WorthTX
| | | | - Martha Bachelor
- Integrative PhysiologyUniversity of North Texas Health Science CenterFort WorthTX
| | - Flavia R Carreno
- Integrative PhysiologyUniversity of North Texas Health Science CenterFort WorthTX
- University of Texas Health Science Center at San AntonioSan AntonioTX
| | - J. Thomas Cunningham
- Integrative PhysiologyUniversity of North Texas Health Science CenterFort WorthTX
- Cardiovascular Research InstituteFort WorthTX
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Nedungadi T, Bachelor M, Cunningham J. Intermittent hypoxia in vitro reduces TRPC4 and neuropeptide expression in 4B cells. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.699.17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Saxena A, Nedungadi TP, Carreno F, Bachelor M, Cunningham JT. Angiotensin II increases Transient Receptor Potential Vanilloid 4 channel Expression and Phosphorylation in Hypothalamic Cell line 4B. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.1104.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ashwini Saxena
- Integrative PhysiologyCardiovascular Research InstituteUniv of North Texas Health Sc CtrFort WorthTX
| | | | - Flavia Carreno
- Integrative PhysiologyCardiovascular Research InstituteUniv of North Texas Health Sc CtrFort WorthTX
| | - Martha Bachelor
- Integrative PhysiologyCardiovascular Research InstituteUniv of North Texas Health Sc CtrFort WorthTX
| | - J. Thomas Cunningham
- Integrative PhysiologyCardiovascular Research InstituteUniv of North Texas Health Sc CtrFort WorthTX
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Abstract
In coagulation tests on five lowland gorillas, values within or close to the normal human range were found with the following tests: partial thromboplastin time, prothrombin time, thrombin time, factor XIII screen, factor II assay, factor V assay, fibrinogen and antithrombin III. Factor XII levels were very high. Factor VIII coagulant activity was moderately elevated but factor VIII antigen was very high in all and ristocetin cofactor activity was low in four of five.
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Abstract
Sixty-four asthmatics and seventy-five control subjects from rural villages and various urban settings have been investigated. Rural asthmatics had a significantly higher IgE level than both urban asthmatics and village controls. Urban asthmatics had similar IgE levels to urban controls. There was no relationship between IgE levels and the results of skin tests for asthma allergens. Stool parasites were found as frequently in asthmatics as in controls. Our findings do not support the theory that parasitic infestation, high IgE levels or rural living protect from asthma.
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Bachelor M, Poh LH. Home nursing. Nurs J Singapore 1979; 19:9-11. [PMID: 258325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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