Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret
This study identified luteinizing hormone-releasing hormone (LHRH)-producing neurons which have access to fenestrated capillaries in prepubertal male European ferrets. Fluoro-Gold was injected intraperitoneally to retrogradely label neurons with terminals outside the blood-brain barrier. LHRH neuron...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Berglund, Lee Ann [verfasserIn] Sisk, Cheryl L. [verfasserIn] |
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| Format: |
E-Artikel |
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| Erschienen: |
Oxford, UK: Blackwell Publishing Ltd ; 1992 |
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| Schlagwörter: |
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| Umfang: |
Online-Ressource |
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| Reproduktion: |
2006 ; Blackwell Publishing Journal Backfiles 1879-2005 |
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| Übergeordnetes Werk: |
In: Journal of neuroendocrinology - Oxford [u.a.] : Wiley-Blackwell, 1989, 4(1992), 6, Seite 0 |
| Übergeordnetes Werk: |
volume:4 ; year:1992 ; number:6 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1111/j.1365-2826.1992.tb00226.x |
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NLEJ240218590 |
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| 245 | 1 | 0 | |a Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret |
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| 520 | |a This study identified luteinizing hormone-releasing hormone (LHRH)-producing neurons which have access to fenestrated capillaries in prepubertal male European ferrets. Fluoro-Gold was injected intraperitoneally to retrogradely label neurons with terminals outside the blood-brain barrier. LHRH neurons were identified by immunofluorescence using a secondary antibody tagged with tetramethylrhodamine isothiocyanate. Cell bodies which demonstrated both tetramethylrhodamine isothiocyanate and Fluoro-Gold fluorescence were defined as LHRH-producing neurons with axon terminals in regions containing fenestrated capillaries. The total number and neuroanatomical distribution of immunopositive (LHRH +) cells concurred with previous studies in the ferret in which cell bodies were diffusely distributed from rostral forebrain through caudal diencephalon, with approximately 70% of the LHRH + cell bodies located in retrochiasmatic hypothalamus. In the present study, an average of 59.8% of all LHRH+ neuronal perikarya also contained Fluoro-Gold. The majority of Fluoro-Gold filled LHRH+ neurons demonstrated only faint to moderate amounts of Fluoro-Gold when compared to other Fluoro-Gold filled neurosecretory neurons. This limited uptake of Fluoro-Gold may be due to a relative inactivity of LHRH neurons projecting outside the blood-brain barrier. Double-labeled LHRH + neurons were dispersed throughout the entire population of LHRH+ cell bodies and no apparent nuclear groups of double-labeled neurons were found. This observation suggests that the LHRH+ neurons responsible for neurosecretion into the median eminence coexist with the LHRH+ neurons responsible for intracerebral neurotransmission or neuromodulation. One distinguishable population of LHRH + neurons was consistently observed in all the brains. Only 26% of total LHRH+ perikarya within the caudal arcuate nucleus contained Fluoro-Gold, while at least 50% of LHRH+ neurons in other structures, including the rostral arcuate nucleus, contained Fluoro-Gold. Thus, in the prepubertal male ferret, the majority of LHRH cell bodies located in the caudal arcuate nucleus may be differentially regulated and/or involved in non-neuroendocrine functions. | ||
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10.1111/j.1365-2826.1992.tb00226.x doi (DE-627)NLEJ240218590 DE-627 ger DE-627 rakwb Berglund, Lee Ann verfasserin aut Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret Oxford, UK Blackwell Publishing Ltd 1992 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This study identified luteinizing hormone-releasing hormone (LHRH)-producing neurons which have access to fenestrated capillaries in prepubertal male European ferrets. Fluoro-Gold was injected intraperitoneally to retrogradely label neurons with terminals outside the blood-brain barrier. LHRH neurons were identified by immunofluorescence using a secondary antibody tagged with tetramethylrhodamine isothiocyanate. Cell bodies which demonstrated both tetramethylrhodamine isothiocyanate and Fluoro-Gold fluorescence were defined as LHRH-producing neurons with axon terminals in regions containing fenestrated capillaries. The total number and neuroanatomical distribution of immunopositive (LHRH +) cells concurred with previous studies in the ferret in which cell bodies were diffusely distributed from rostral forebrain through caudal diencephalon, with approximately 70% of the LHRH + cell bodies located in retrochiasmatic hypothalamus. In the present study, an average of 59.8% of all LHRH+ neuronal perikarya also contained Fluoro-Gold. The majority of Fluoro-Gold filled LHRH+ neurons demonstrated only faint to moderate amounts of Fluoro-Gold when compared to other Fluoro-Gold filled neurosecretory neurons. This limited uptake of Fluoro-Gold may be due to a relative inactivity of LHRH neurons projecting outside the blood-brain barrier. Double-labeled LHRH + neurons were dispersed throughout the entire population of LHRH+ cell bodies and no apparent nuclear groups of double-labeled neurons were found. This observation suggests that the LHRH+ neurons responsible for neurosecretion into the median eminence coexist with the LHRH+ neurons responsible for intracerebral neurotransmission or neuromodulation. One distinguishable population of LHRH + neurons was consistently observed in all the brains. Only 26% of total LHRH+ perikarya within the caudal arcuate nucleus contained Fluoro-Gold, while at least 50% of LHRH+ neurons in other structures, including the rostral arcuate nucleus, contained Fluoro-Gold. Thus, in the prepubertal male ferret, the majority of LHRH cell bodies located in the caudal arcuate nucleus may be differentially regulated and/or involved in non-neuroendocrine functions. 2006 Blackwell Publishing Journal Backfiles 1879-2005 |2006|||||||||| luteinizing hormone-releasing hormone Sisk, Cheryl L. verfasserin aut In Journal of neuroendocrinology Oxford [u.a.] : Wiley-Blackwell, 1989 4(1992), 6, Seite 0 Online-Ressource (DE-627)NLEJ243926375 (DE-600)2007386-0 1365-2826 nnns volume:4 year:1992 number:6 pages:0 http://dx.doi.org/10.1111/j.1365-2826.1992.tb00226.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 4 1992 6 0 |
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10.1111/j.1365-2826.1992.tb00226.x doi (DE-627)NLEJ240218590 DE-627 ger DE-627 rakwb Berglund, Lee Ann verfasserin aut Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret Oxford, UK Blackwell Publishing Ltd 1992 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This study identified luteinizing hormone-releasing hormone (LHRH)-producing neurons which have access to fenestrated capillaries in prepubertal male European ferrets. Fluoro-Gold was injected intraperitoneally to retrogradely label neurons with terminals outside the blood-brain barrier. LHRH neurons were identified by immunofluorescence using a secondary antibody tagged with tetramethylrhodamine isothiocyanate. Cell bodies which demonstrated both tetramethylrhodamine isothiocyanate and Fluoro-Gold fluorescence were defined as LHRH-producing neurons with axon terminals in regions containing fenestrated capillaries. The total number and neuroanatomical distribution of immunopositive (LHRH +) cells concurred with previous studies in the ferret in which cell bodies were diffusely distributed from rostral forebrain through caudal diencephalon, with approximately 70% of the LHRH + cell bodies located in retrochiasmatic hypothalamus. In the present study, an average of 59.8% of all LHRH+ neuronal perikarya also contained Fluoro-Gold. The majority of Fluoro-Gold filled LHRH+ neurons demonstrated only faint to moderate amounts of Fluoro-Gold when compared to other Fluoro-Gold filled neurosecretory neurons. This limited uptake of Fluoro-Gold may be due to a relative inactivity of LHRH neurons projecting outside the blood-brain barrier. Double-labeled LHRH + neurons were dispersed throughout the entire population of LHRH+ cell bodies and no apparent nuclear groups of double-labeled neurons were found. This observation suggests that the LHRH+ neurons responsible for neurosecretion into the median eminence coexist with the LHRH+ neurons responsible for intracerebral neurotransmission or neuromodulation. One distinguishable population of LHRH + neurons was consistently observed in all the brains. Only 26% of total LHRH+ perikarya within the caudal arcuate nucleus contained Fluoro-Gold, while at least 50% of LHRH+ neurons in other structures, including the rostral arcuate nucleus, contained Fluoro-Gold. Thus, in the prepubertal male ferret, the majority of LHRH cell bodies located in the caudal arcuate nucleus may be differentially regulated and/or involved in non-neuroendocrine functions. 2006 Blackwell Publishing Journal Backfiles 1879-2005 |2006|||||||||| luteinizing hormone-releasing hormone Sisk, Cheryl L. verfasserin aut In Journal of neuroendocrinology Oxford [u.a.] : Wiley-Blackwell, 1989 4(1992), 6, Seite 0 Online-Ressource (DE-627)NLEJ243926375 (DE-600)2007386-0 1365-2826 nnns volume:4 year:1992 number:6 pages:0 http://dx.doi.org/10.1111/j.1365-2826.1992.tb00226.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 4 1992 6 0 |
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10.1111/j.1365-2826.1992.tb00226.x doi (DE-627)NLEJ240218590 DE-627 ger DE-627 rakwb Berglund, Lee Ann verfasserin aut Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret Oxford, UK Blackwell Publishing Ltd 1992 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This study identified luteinizing hormone-releasing hormone (LHRH)-producing neurons which have access to fenestrated capillaries in prepubertal male European ferrets. Fluoro-Gold was injected intraperitoneally to retrogradely label neurons with terminals outside the blood-brain barrier. LHRH neurons were identified by immunofluorescence using a secondary antibody tagged with tetramethylrhodamine isothiocyanate. Cell bodies which demonstrated both tetramethylrhodamine isothiocyanate and Fluoro-Gold fluorescence were defined as LHRH-producing neurons with axon terminals in regions containing fenestrated capillaries. The total number and neuroanatomical distribution of immunopositive (LHRH +) cells concurred with previous studies in the ferret in which cell bodies were diffusely distributed from rostral forebrain through caudal diencephalon, with approximately 70% of the LHRH + cell bodies located in retrochiasmatic hypothalamus. In the present study, an average of 59.8% of all LHRH+ neuronal perikarya also contained Fluoro-Gold. The majority of Fluoro-Gold filled LHRH+ neurons demonstrated only faint to moderate amounts of Fluoro-Gold when compared to other Fluoro-Gold filled neurosecretory neurons. This limited uptake of Fluoro-Gold may be due to a relative inactivity of LHRH neurons projecting outside the blood-brain barrier. Double-labeled LHRH + neurons were dispersed throughout the entire population of LHRH+ cell bodies and no apparent nuclear groups of double-labeled neurons were found. This observation suggests that the LHRH+ neurons responsible for neurosecretion into the median eminence coexist with the LHRH+ neurons responsible for intracerebral neurotransmission or neuromodulation. One distinguishable population of LHRH + neurons was consistently observed in all the brains. Only 26% of total LHRH+ perikarya within the caudal arcuate nucleus contained Fluoro-Gold, while at least 50% of LHRH+ neurons in other structures, including the rostral arcuate nucleus, contained Fluoro-Gold. Thus, in the prepubertal male ferret, the majority of LHRH cell bodies located in the caudal arcuate nucleus may be differentially regulated and/or involved in non-neuroendocrine functions. 2006 Blackwell Publishing Journal Backfiles 1879-2005 |2006|||||||||| luteinizing hormone-releasing hormone Sisk, Cheryl L. verfasserin aut In Journal of neuroendocrinology Oxford [u.a.] : Wiley-Blackwell, 1989 4(1992), 6, Seite 0 Online-Ressource (DE-627)NLEJ243926375 (DE-600)2007386-0 1365-2826 nnns volume:4 year:1992 number:6 pages:0 http://dx.doi.org/10.1111/j.1365-2826.1992.tb00226.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 4 1992 6 0 |
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10.1111/j.1365-2826.1992.tb00226.x doi (DE-627)NLEJ240218590 DE-627 ger DE-627 rakwb Berglund, Lee Ann verfasserin aut Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret Oxford, UK Blackwell Publishing Ltd 1992 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This study identified luteinizing hormone-releasing hormone (LHRH)-producing neurons which have access to fenestrated capillaries in prepubertal male European ferrets. Fluoro-Gold was injected intraperitoneally to retrogradely label neurons with terminals outside the blood-brain barrier. LHRH neurons were identified by immunofluorescence using a secondary antibody tagged with tetramethylrhodamine isothiocyanate. Cell bodies which demonstrated both tetramethylrhodamine isothiocyanate and Fluoro-Gold fluorescence were defined as LHRH-producing neurons with axon terminals in regions containing fenestrated capillaries. The total number and neuroanatomical distribution of immunopositive (LHRH +) cells concurred with previous studies in the ferret in which cell bodies were diffusely distributed from rostral forebrain through caudal diencephalon, with approximately 70% of the LHRH + cell bodies located in retrochiasmatic hypothalamus. In the present study, an average of 59.8% of all LHRH+ neuronal perikarya also contained Fluoro-Gold. The majority of Fluoro-Gold filled LHRH+ neurons demonstrated only faint to moderate amounts of Fluoro-Gold when compared to other Fluoro-Gold filled neurosecretory neurons. This limited uptake of Fluoro-Gold may be due to a relative inactivity of LHRH neurons projecting outside the blood-brain barrier. Double-labeled LHRH + neurons were dispersed throughout the entire population of LHRH+ cell bodies and no apparent nuclear groups of double-labeled neurons were found. This observation suggests that the LHRH+ neurons responsible for neurosecretion into the median eminence coexist with the LHRH+ neurons responsible for intracerebral neurotransmission or neuromodulation. One distinguishable population of LHRH + neurons was consistently observed in all the brains. Only 26% of total LHRH+ perikarya within the caudal arcuate nucleus contained Fluoro-Gold, while at least 50% of LHRH+ neurons in other structures, including the rostral arcuate nucleus, contained Fluoro-Gold. Thus, in the prepubertal male ferret, the majority of LHRH cell bodies located in the caudal arcuate nucleus may be differentially regulated and/or involved in non-neuroendocrine functions. 2006 Blackwell Publishing Journal Backfiles 1879-2005 |2006|||||||||| luteinizing hormone-releasing hormone Sisk, Cheryl L. verfasserin aut In Journal of neuroendocrinology Oxford [u.a.] : Wiley-Blackwell, 1989 4(1992), 6, Seite 0 Online-Ressource (DE-627)NLEJ243926375 (DE-600)2007386-0 1365-2826 nnns volume:4 year:1992 number:6 pages:0 http://dx.doi.org/10.1111/j.1365-2826.1992.tb00226.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 4 1992 6 0 |
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10.1111/j.1365-2826.1992.tb00226.x doi (DE-627)NLEJ240218590 DE-627 ger DE-627 rakwb Berglund, Lee Ann verfasserin aut Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret Oxford, UK Blackwell Publishing Ltd 1992 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This study identified luteinizing hormone-releasing hormone (LHRH)-producing neurons which have access to fenestrated capillaries in prepubertal male European ferrets. Fluoro-Gold was injected intraperitoneally to retrogradely label neurons with terminals outside the blood-brain barrier. LHRH neurons were identified by immunofluorescence using a secondary antibody tagged with tetramethylrhodamine isothiocyanate. Cell bodies which demonstrated both tetramethylrhodamine isothiocyanate and Fluoro-Gold fluorescence were defined as LHRH-producing neurons with axon terminals in regions containing fenestrated capillaries. The total number and neuroanatomical distribution of immunopositive (LHRH +) cells concurred with previous studies in the ferret in which cell bodies were diffusely distributed from rostral forebrain through caudal diencephalon, with approximately 70% of the LHRH + cell bodies located in retrochiasmatic hypothalamus. In the present study, an average of 59.8% of all LHRH+ neuronal perikarya also contained Fluoro-Gold. The majority of Fluoro-Gold filled LHRH+ neurons demonstrated only faint to moderate amounts of Fluoro-Gold when compared to other Fluoro-Gold filled neurosecretory neurons. This limited uptake of Fluoro-Gold may be due to a relative inactivity of LHRH neurons projecting outside the blood-brain barrier. Double-labeled LHRH + neurons were dispersed throughout the entire population of LHRH+ cell bodies and no apparent nuclear groups of double-labeled neurons were found. This observation suggests that the LHRH+ neurons responsible for neurosecretion into the median eminence coexist with the LHRH+ neurons responsible for intracerebral neurotransmission or neuromodulation. One distinguishable population of LHRH + neurons was consistently observed in all the brains. Only 26% of total LHRH+ perikarya within the caudal arcuate nucleus contained Fluoro-Gold, while at least 50% of LHRH+ neurons in other structures, including the rostral arcuate nucleus, contained Fluoro-Gold. Thus, in the prepubertal male ferret, the majority of LHRH cell bodies located in the caudal arcuate nucleus may be differentially regulated and/or involved in non-neuroendocrine functions. 2006 Blackwell Publishing Journal Backfiles 1879-2005 |2006|||||||||| luteinizing hormone-releasing hormone Sisk, Cheryl L. verfasserin aut In Journal of neuroendocrinology Oxford [u.a.] : Wiley-Blackwell, 1989 4(1992), 6, Seite 0 Online-Ressource (DE-627)NLEJ243926375 (DE-600)2007386-0 1365-2826 nnns volume:4 year:1992 number:6 pages:0 http://dx.doi.org/10.1111/j.1365-2826.1992.tb00226.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 4 1992 6 0 |
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Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret luteinizing hormone-releasing hormone |
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Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret |
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Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret |
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Berglund, Lee Ann |
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Journal of neuroendocrinology |
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1992 |
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Berglund, Lee Ann Sisk, Cheryl L. |
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Berglund, Lee Ann |
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luteinizing hormone-releasing hormone neurons which are r-etrogradely labeled after peripheral fluoro-gold administration in the male ferret |
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Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret |
| abstract |
This study identified luteinizing hormone-releasing hormone (LHRH)-producing neurons which have access to fenestrated capillaries in prepubertal male European ferrets. Fluoro-Gold was injected intraperitoneally to retrogradely label neurons with terminals outside the blood-brain barrier. LHRH neurons were identified by immunofluorescence using a secondary antibody tagged with tetramethylrhodamine isothiocyanate. Cell bodies which demonstrated both tetramethylrhodamine isothiocyanate and Fluoro-Gold fluorescence were defined as LHRH-producing neurons with axon terminals in regions containing fenestrated capillaries. The total number and neuroanatomical distribution of immunopositive (LHRH +) cells concurred with previous studies in the ferret in which cell bodies were diffusely distributed from rostral forebrain through caudal diencephalon, with approximately 70% of the LHRH + cell bodies located in retrochiasmatic hypothalamus. In the present study, an average of 59.8% of all LHRH+ neuronal perikarya also contained Fluoro-Gold. The majority of Fluoro-Gold filled LHRH+ neurons demonstrated only faint to moderate amounts of Fluoro-Gold when compared to other Fluoro-Gold filled neurosecretory neurons. This limited uptake of Fluoro-Gold may be due to a relative inactivity of LHRH neurons projecting outside the blood-brain barrier. Double-labeled LHRH + neurons were dispersed throughout the entire population of LHRH+ cell bodies and no apparent nuclear groups of double-labeled neurons were found. This observation suggests that the LHRH+ neurons responsible for neurosecretion into the median eminence coexist with the LHRH+ neurons responsible for intracerebral neurotransmission or neuromodulation. One distinguishable population of LHRH + neurons was consistently observed in all the brains. Only 26% of total LHRH+ perikarya within the caudal arcuate nucleus contained Fluoro-Gold, while at least 50% of LHRH+ neurons in other structures, including the rostral arcuate nucleus, contained Fluoro-Gold. Thus, in the prepubertal male ferret, the majority of LHRH cell bodies located in the caudal arcuate nucleus may be differentially regulated and/or involved in non-neuroendocrine functions. |
| abstractGer |
This study identified luteinizing hormone-releasing hormone (LHRH)-producing neurons which have access to fenestrated capillaries in prepubertal male European ferrets. Fluoro-Gold was injected intraperitoneally to retrogradely label neurons with terminals outside the blood-brain barrier. LHRH neurons were identified by immunofluorescence using a secondary antibody tagged with tetramethylrhodamine isothiocyanate. Cell bodies which demonstrated both tetramethylrhodamine isothiocyanate and Fluoro-Gold fluorescence were defined as LHRH-producing neurons with axon terminals in regions containing fenestrated capillaries. The total number and neuroanatomical distribution of immunopositive (LHRH +) cells concurred with previous studies in the ferret in which cell bodies were diffusely distributed from rostral forebrain through caudal diencephalon, with approximately 70% of the LHRH + cell bodies located in retrochiasmatic hypothalamus. In the present study, an average of 59.8% of all LHRH+ neuronal perikarya also contained Fluoro-Gold. The majority of Fluoro-Gold filled LHRH+ neurons demonstrated only faint to moderate amounts of Fluoro-Gold when compared to other Fluoro-Gold filled neurosecretory neurons. This limited uptake of Fluoro-Gold may be due to a relative inactivity of LHRH neurons projecting outside the blood-brain barrier. Double-labeled LHRH + neurons were dispersed throughout the entire population of LHRH+ cell bodies and no apparent nuclear groups of double-labeled neurons were found. This observation suggests that the LHRH+ neurons responsible for neurosecretion into the median eminence coexist with the LHRH+ neurons responsible for intracerebral neurotransmission or neuromodulation. One distinguishable population of LHRH + neurons was consistently observed in all the brains. Only 26% of total LHRH+ perikarya within the caudal arcuate nucleus contained Fluoro-Gold, while at least 50% of LHRH+ neurons in other structures, including the rostral arcuate nucleus, contained Fluoro-Gold. Thus, in the prepubertal male ferret, the majority of LHRH cell bodies located in the caudal arcuate nucleus may be differentially regulated and/or involved in non-neuroendocrine functions. |
| abstract_unstemmed |
This study identified luteinizing hormone-releasing hormone (LHRH)-producing neurons which have access to fenestrated capillaries in prepubertal male European ferrets. Fluoro-Gold was injected intraperitoneally to retrogradely label neurons with terminals outside the blood-brain barrier. LHRH neurons were identified by immunofluorescence using a secondary antibody tagged with tetramethylrhodamine isothiocyanate. Cell bodies which demonstrated both tetramethylrhodamine isothiocyanate and Fluoro-Gold fluorescence were defined as LHRH-producing neurons with axon terminals in regions containing fenestrated capillaries. The total number and neuroanatomical distribution of immunopositive (LHRH +) cells concurred with previous studies in the ferret in which cell bodies were diffusely distributed from rostral forebrain through caudal diencephalon, with approximately 70% of the LHRH + cell bodies located in retrochiasmatic hypothalamus. In the present study, an average of 59.8% of all LHRH+ neuronal perikarya also contained Fluoro-Gold. The majority of Fluoro-Gold filled LHRH+ neurons demonstrated only faint to moderate amounts of Fluoro-Gold when compared to other Fluoro-Gold filled neurosecretory neurons. This limited uptake of Fluoro-Gold may be due to a relative inactivity of LHRH neurons projecting outside the blood-brain barrier. Double-labeled LHRH + neurons were dispersed throughout the entire population of LHRH+ cell bodies and no apparent nuclear groups of double-labeled neurons were found. This observation suggests that the LHRH+ neurons responsible for neurosecretion into the median eminence coexist with the LHRH+ neurons responsible for intracerebral neurotransmission or neuromodulation. One distinguishable population of LHRH + neurons was consistently observed in all the brains. Only 26% of total LHRH+ perikarya within the caudal arcuate nucleus contained Fluoro-Gold, while at least 50% of LHRH+ neurons in other structures, including the rostral arcuate nucleus, contained Fluoro-Gold. Thus, in the prepubertal male ferret, the majority of LHRH cell bodies located in the caudal arcuate nucleus may be differentially regulated and/or involved in non-neuroendocrine functions. |
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Luteinizing Hormone-Releasing Hormone Neurons which are R-etrogradely Labeled After Peripheral Fluoro-Gold Administration in the Male Ferret |
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