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Divalent cations an...
Divalent cations and fast axonal transport in chemically desheathed (triton X-treated) frog sciatic nerve
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- Kanje, Martin (författare)
- Lund University,Lunds universitet,Neuronano Research Center (NRC),Forskargrupper vid Lunds universitet,Biologiska institutionen,Naturvetenskapliga fakulteten,Lund University Research Groups,Department of Biology,Faculty of Science
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- Edström, Anders (författare)
- Lund University,Lunds universitet,Funktionell zoologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Functional zoology,Department of Biology,Faculty of Science
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- Ekström, Per (författare)
- Lund University,Lunds universitet,Oftalmologi, Lund,Sektion IV,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Retinal degeneration: Molekylär patologi,Forskargrupper vid Lunds universitet,Ophthalmology, Lund,Section IV,Department of Clinical Sciences, Lund,Faculty of Medicine,Retinal degeneration: Molecular Pathology,Lund University Research Groups
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(creator_code:org_t)
- 1982
- 1982
- Engelska 8 s.
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Ingår i: Brain Research. - 0006-8993. ; 241:1, s. 67-74
- Relaterad länk:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We have studied the ability of divalent cations to restore to normal axonal transport (AXT) which was inhibited by deprivation of Ca2+ and/or Mg2+ ions. The epi- and perineurium of the frog sciatic nerve were damaged by a 30-s wash in Triton X-100 containing frog Ringer's. This treatment did not affect either AXT or nerve levels of Ca2+ and Mg2+, but made the ions more easily extractable with a Ca2+- and Mg2+-free Ringer's solution (CMFR). Inhibition of AXT was achieved by incubating Triton X-100-treated nerves in CMFR + EGTA for 5 h, followed by an additional incubation for 12 h in CMFR or Ringer's devoid of only Ca2+ (CFR). These treatments reduced Ca2+ and Mg2+ contents by 77% and 38% respectively. Addition of Ca2+ (1.1 mM) during the 12-h period stimulated AXT, measured as accumulation of 3H-labelled components in front of a ligature, several fold. Mg2+ could not substitute for Ca2+ but potentiated the stimulating effect of Ca2+. Addition of other divalent cations did not affect AXT (Sr2+ and Ba2+) or potentiated the inhibition caused by Ca2+-deprived medium (Mn2+ and Co2+). ATP and creatine phosphate contents were similar in nerves incubated in Ca2+-deprived medium and in Ca2+-containing Ringer's. Thus, inhibition of AXT in the former situation was not due to a decreased availability of high energy phosphates. Two calcium antagonists, D-600 and nifedipin, which are potent smooth muscle relaxants, effectively blocked AXT. The present ressults suggest that Ca2+ is specifically required to maintain AXT and that an anlogy exists between Ca2+ regulation during smooth muscle contraction and AXT.
Ämnesord
- NATURVETENSKAP -- Biologi -- Cellbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Cell Biology (hsv//eng)
Nyckelord
- axonal transport
- calcium
- calcium antagonists
- divalent cations
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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