当前位置： SCI文献检索 > ARCHIVES OF GERONTOLOGY AND GERIATRICS期刊下所有文献 > Verification of the membrane hypothesis of aging on the identified giant neurons of the snail Lymnaea stagnalis L. (Gastropoda, Pulmonata) by a combined application of intracellular electrophysiology and X-ray microanalysis.

Verification of the membrane hypothesis of aging on the identified giant neurons of the snail Lymnaea stagnalis L. (Gastropoda, Pulmonata) by a combined application of intracellular electrophysiology and X-ray microanalysis.

Abstract：

:The validity of the membrane hypothesis of aging (Zs.-Nagy, 1978) was tested on identified giant neurons of the snail Lymnaea stagnalis L. by using a combination of intracellular microelectrophysiology and X-ray microanalysis of the intracellular water and electrolyte concentrations on the very same cells. The snails were taken from an inbred stock and divided into young, adult and old age groups (3, 12 and 24 mth, respectively). The giant neuron called LPa-2 from the left parietal ganglion was selected for the studies. The resting potential of the cell membrane was recorded by means of intracellular microelectrode technique. The very same cells were then explored by freeze fracture and analyzed by an energy dispersive bulk specimen method of X-ray microanalysis. The resting membrane potential displayed an age-dependent hyperpolarization, the intracellular water content decreased considerably and the intracellular potassium concentration increased almost 90% by old age. The relative passive permeability ratio for potassium (PK) and chloride (PCl) was calculated from the measured data by means of the Goldman-Hodgkin-Katz equation. Such calculations revealed that PK decreases nearly 50% with age causing the increase of the intracellular potassium content, and this is accompanied also by a significant decrease of the PCl. The results support the validity of the membrane hypothesis of aging and are in agreement with the general knowledge regarding the electrophysiological behaviour of the giant neurons of Gastropode snails.

journal_name

Arch Gerontol Geriatr

journal_title

Archives of gerontology and geriatrics

authors

Nagy I,Tóth S,Lustyik G

doi

10.1016/0167-4943(85)90018-4

subject

Has Abstract

pub_date

1985-04-01 00:00:00

pages

53-66

issue

1

eissn

0167-4943

issn

1872-6976

pii

0167-4943(85)90018-4

journal_volume

4

pub_type

杂志文章

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