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Titolo:
Aortic depressor nerve unmyelinated fibers in spontaneously hypertensive rats
Autore:
Vazan, VPS; Salgado, HC; Barreira, AA;
Indirizzi:
Sch Med Triangulo Mineiro, Dept Biol Sci, BR-38015050 Uberaba, MG, Brazil Sch Med Triangulo Mineiro Uberaba MG Brazil BR-38015050 BCaba, MG, Brazil Univ Sao Paulo, Sch Med Ribeiro Preto, Dept Physiol, BR-14049900 Sao Paulo, Brazil Univ Sao Paulo Sao Paulo Brazil BR-14049900 BC14049900 Sao Paulo, Brazil Univ Sao Paulo, Sch Med Ribeiro Preto, Dept Neurol, BR-14049900 Sao Paulo,Brazil Univ Sao Paulo Sao Paulo Brazil BR-14049900 BC-14049900 Sao Paulo,Brazil Univ Sao Paulo, Sch Med Ribeiro Preto, Univ Hosp, BR-14049900 Sao Paulo, Brazil Univ Sao Paulo Sao Paulo Brazil BR-14049900 BC14049900 Sao Paulo, Brazil
Titolo Testata:
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
fascicolo: 4, volume: 280, anno: 2001,
pagine: H1560 - H1564
SICI:
0363-6135(200104)280:4<H1560:ADNUFI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
WISTAR-KYOTO; BARORECEPTORS;
Keywords:
peripheral nerves; electron microscopy; rat peripheral nervous system; experimental hypertension; Wistar-Kyoto rats;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Barreira, AA USP, Fac Med Ribeirao Preto, Dept Neurol, Av Bandeirantes 3900, BR-14049900 Ribeirao Preto, SP, Brazil USP Av Bandeirantes 3900 RibeiraoPreto SP Brazil BR-14049900 BC
Citazione:
V.P.S. Vazan et al., "Aortic depressor nerve unmyelinated fibers in spontaneously hypertensive rats", AM J P-HEAR, 280(4), 2001, pp. H1560-H1564

Abstract

The objective of the present study was to compare the morphology of the unmyelinated fibers in the aortic depressor nerves (ADN) of spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats (WKY). In anesthetized rats, theADN was identified by its spontaneous activity synchronous with the arterial pulses. Thin sections of the proximal and distal segments of the ADN were analyzed by electron microscopy, and a morphometric study of the unmyelinated fibers and Schwann cells was performed. The objective of the present study was to compare the morphology of the unmyelinated fibers in the aorticdepressor nerves (ADN) of spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats (WKY). In anesthetized rats, the ADN was identified by its spontaneous activity synchronous with the arterial pulses. Thin sections of theproximal and distal segments of the ADN were analyzed by electron microscopy, and a morphometric study of the unmyelinated fibers and Schwann cells was performed. The proximal segments of WKY and SHR ADN contain an average of 335 +/- 68 and 130 +/- 14 unmyelinated fibers, respectively (P < 0.05), and the distal segments contain an average of 337 +/- 46 and 242 +/- 77 unmyelinated fibers, respectively (P < 0.05). The distribution of the diametersof unmyelinated fibers was unimodal for both strains, with the histogram from the SHR significantly shifted to the left. Because the unmyelinated fibers play a role in the tonic inhibition of the medullary vasomotor centers,especially in the presence of hypertension, the morphological differences observed in the ADN from SHR may account, at least in part, for the bluntedbaroreflex of SHR.

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Documento generato il 23/01/20 alle ore 18:49:26