Protective effect of a prosaposin-derived, 18-mer peptide on slowly progressive neuronal degeneration after brief ischemia

Fumio Morita, Tong Chun Wen, Junya Tanaka, Ryuji Hata, Junzo Desaki, Kohji Sato, Kimihiko Nakata, Yong Jie Ma, Masahiro Sakanaka

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Slowly progressive degeneration of the hippocampal CA1 neurons was induced by 3-minute transient global ischemia in gerbils. Sustained degeneration of hippocampal CA1 neurons was evident 1 month after ischemia. To investigate the effects of an 18-mer peptide comprising the hydrophilic sequence of the rat saposin C domain (18MP) on this sustained neuronal degeneration, an intracerebroventricular 18MP infusion was initiated 3 days after ischemia. Histopathologic and behavior evaluations were conducted 1 week and 1 month after induction of ischemia. When compared with the vehicle infusion, 18MP treatment significantly increased the response latency time in a passive avoidance task. Increased neuronal density was also evident, as was the number of intact synapses in the hippocampal CA1 region at 1 week and 1 month after ischemia. 18MP treatment also significantly decreased the number of TUNEL-positive CA1 neurons 1 week after ischemia. Subsequent in vitro experiments using cultured neurons demonstrated that the 18MP at optimal extracellular concentrations of 1 to 100 fg/mL prevented nitric oxideinduced neuronal damage as expected and significantly upregulated the expressions of bcl-xL mRNA and its translated protein. These results suggest that the gerbil model of 3-minute ischemia is useful in studying the pathogenesis of slowly progressive neuronal degeneration after stroke and in evaluating effects of novel therapeutic agents. It is likely that the 18MP at low extracellular concentrations prevents neuronal apoptosis possibly through up-regulation of the mitochondrial antiapoptotic factor Bcl-xL.

Original languageEnglish
Pages (from-to)1295-1302
Number of pages8
JournalJournal of Cerebral Blood Flow and Metabolism
Volume21
Issue number11
DOIs
Publication statusPublished - 01-01-2001

Fingerprint

Ischemia
Peptides
Neurons
Gerbillinae
Saposins
Intraventricular Infusions
Hippocampal CA1 Region
In Situ Nick-End Labeling
Therapeutic Uses
Synapses
Reaction Time
Up-Regulation
Stroke
Apoptosis
Messenger RNA
Therapeutics
Proteins

All Science Journal Classification (ASJC) codes

  • Neurology
  • Clinical Neurology
  • Cardiology and Cardiovascular Medicine

Cite this

Morita, Fumio ; Wen, Tong Chun ; Tanaka, Junya ; Hata, Ryuji ; Desaki, Junzo ; Sato, Kohji ; Nakata, Kimihiko ; Ma, Yong Jie ; Sakanaka, Masahiro. / Protective effect of a prosaposin-derived, 18-mer peptide on slowly progressive neuronal degeneration after brief ischemia. In: Journal of Cerebral Blood Flow and Metabolism. 2001 ; Vol. 21, No. 11. pp. 1295-1302.
@article{1ac2b5e511404690989cc1c0c587d506,
title = "Protective effect of a prosaposin-derived, 18-mer peptide on slowly progressive neuronal degeneration after brief ischemia",
abstract = "Slowly progressive degeneration of the hippocampal CA1 neurons was induced by 3-minute transient global ischemia in gerbils. Sustained degeneration of hippocampal CA1 neurons was evident 1 month after ischemia. To investigate the effects of an 18-mer peptide comprising the hydrophilic sequence of the rat saposin C domain (18MP) on this sustained neuronal degeneration, an intracerebroventricular 18MP infusion was initiated 3 days after ischemia. Histopathologic and behavior evaluations were conducted 1 week and 1 month after induction of ischemia. When compared with the vehicle infusion, 18MP treatment significantly increased the response latency time in a passive avoidance task. Increased neuronal density was also evident, as was the number of intact synapses in the hippocampal CA1 region at 1 week and 1 month after ischemia. 18MP treatment also significantly decreased the number of TUNEL-positive CA1 neurons 1 week after ischemia. Subsequent in vitro experiments using cultured neurons demonstrated that the 18MP at optimal extracellular concentrations of 1 to 100 fg/mL prevented nitric oxideinduced neuronal damage as expected and significantly upregulated the expressions of bcl-xL mRNA and its translated protein. These results suggest that the gerbil model of 3-minute ischemia is useful in studying the pathogenesis of slowly progressive neuronal degeneration after stroke and in evaluating effects of novel therapeutic agents. It is likely that the 18MP at low extracellular concentrations prevents neuronal apoptosis possibly through up-regulation of the mitochondrial antiapoptotic factor Bcl-xL.",
author = "Fumio Morita and Wen, {Tong Chun} and Junya Tanaka and Ryuji Hata and Junzo Desaki and Kohji Sato and Kimihiko Nakata and Ma, {Yong Jie} and Masahiro Sakanaka",
year = "2001",
month = "1",
day = "1",
doi = "10.1097/00004647-200111000-00005",
language = "English",
volume = "21",
pages = "1295--1302",
journal = "Journal of Cerebral Blood Flow and Metabolism",
issn = "0271-678X",
publisher = "Nature Publishing Group",
number = "11",

}

Protective effect of a prosaposin-derived, 18-mer peptide on slowly progressive neuronal degeneration after brief ischemia. / Morita, Fumio; Wen, Tong Chun; Tanaka, Junya; Hata, Ryuji; Desaki, Junzo; Sato, Kohji; Nakata, Kimihiko; Ma, Yong Jie; Sakanaka, Masahiro.

In: Journal of Cerebral Blood Flow and Metabolism, Vol. 21, No. 11, 01.01.2001, p. 1295-1302.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Protective effect of a prosaposin-derived, 18-mer peptide on slowly progressive neuronal degeneration after brief ischemia

AU - Morita, Fumio

AU - Wen, Tong Chun

AU - Tanaka, Junya

AU - Hata, Ryuji

AU - Desaki, Junzo

AU - Sato, Kohji

AU - Nakata, Kimihiko

AU - Ma, Yong Jie

AU - Sakanaka, Masahiro

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Slowly progressive degeneration of the hippocampal CA1 neurons was induced by 3-minute transient global ischemia in gerbils. Sustained degeneration of hippocampal CA1 neurons was evident 1 month after ischemia. To investigate the effects of an 18-mer peptide comprising the hydrophilic sequence of the rat saposin C domain (18MP) on this sustained neuronal degeneration, an intracerebroventricular 18MP infusion was initiated 3 days after ischemia. Histopathologic and behavior evaluations were conducted 1 week and 1 month after induction of ischemia. When compared with the vehicle infusion, 18MP treatment significantly increased the response latency time in a passive avoidance task. Increased neuronal density was also evident, as was the number of intact synapses in the hippocampal CA1 region at 1 week and 1 month after ischemia. 18MP treatment also significantly decreased the number of TUNEL-positive CA1 neurons 1 week after ischemia. Subsequent in vitro experiments using cultured neurons demonstrated that the 18MP at optimal extracellular concentrations of 1 to 100 fg/mL prevented nitric oxideinduced neuronal damage as expected and significantly upregulated the expressions of bcl-xL mRNA and its translated protein. These results suggest that the gerbil model of 3-minute ischemia is useful in studying the pathogenesis of slowly progressive neuronal degeneration after stroke and in evaluating effects of novel therapeutic agents. It is likely that the 18MP at low extracellular concentrations prevents neuronal apoptosis possibly through up-regulation of the mitochondrial antiapoptotic factor Bcl-xL.

AB - Slowly progressive degeneration of the hippocampal CA1 neurons was induced by 3-minute transient global ischemia in gerbils. Sustained degeneration of hippocampal CA1 neurons was evident 1 month after ischemia. To investigate the effects of an 18-mer peptide comprising the hydrophilic sequence of the rat saposin C domain (18MP) on this sustained neuronal degeneration, an intracerebroventricular 18MP infusion was initiated 3 days after ischemia. Histopathologic and behavior evaluations were conducted 1 week and 1 month after induction of ischemia. When compared with the vehicle infusion, 18MP treatment significantly increased the response latency time in a passive avoidance task. Increased neuronal density was also evident, as was the number of intact synapses in the hippocampal CA1 region at 1 week and 1 month after ischemia. 18MP treatment also significantly decreased the number of TUNEL-positive CA1 neurons 1 week after ischemia. Subsequent in vitro experiments using cultured neurons demonstrated that the 18MP at optimal extracellular concentrations of 1 to 100 fg/mL prevented nitric oxideinduced neuronal damage as expected and significantly upregulated the expressions of bcl-xL mRNA and its translated protein. These results suggest that the gerbil model of 3-minute ischemia is useful in studying the pathogenesis of slowly progressive neuronal degeneration after stroke and in evaluating effects of novel therapeutic agents. It is likely that the 18MP at low extracellular concentrations prevents neuronal apoptosis possibly through up-regulation of the mitochondrial antiapoptotic factor Bcl-xL.

UR - http://www.scopus.com/inward/record.url?scp=0035203559&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035203559&partnerID=8YFLogxK

U2 - 10.1097/00004647-200111000-00005

DO - 10.1097/00004647-200111000-00005

M3 - Article

VL - 21

SP - 1295

EP - 1302

JO - Journal of Cerebral Blood Flow and Metabolism

JF - Journal of Cerebral Blood Flow and Metabolism

SN - 0271-678X

IS - 11

ER -