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The cells may undergo changes of their membrane currents during ontogeny and gliosis as described in rabbit and man. Although the rat retina is often used in physiological experiments, the electrophysiology of rat M\u00fcller cells is less well studied. The aim of the present study was to characterize their membrane currents in postnatal development and in two models of retinal degeneration. Freshly isolated cells were subjected to whole\u2010cell patch clamp recordings. During the first 4 weeks after birth of rats, their M\u00fcller cells displayed an increase in all membrane currents, particularly in the inward currents elicited at hyperpolarizing potentials. The decrease of the membrane resistance from more than 760 M\u03a9 to less than 50 M\u03a9 was accompanied by a shift of the zero current potential from about \u221220 mV to \u221280 mV, similar as earlier observed in developing rabbit M\u00fcller cells. These developmental changes were found in pigmented Brown Norway rats as well as in rats with inherited retinal dystrophy (RCS rats). Moreover, an infection of Lewis rats with the Borna disease virus caused substantial neuroretinal degeneration but did not result in a strong reduction of inward currents and of the zero current potential of the M\u00fcller cells. Thus, rat M\u00fcller cells fail to change their basic membrane properties in two different models of retinal pathology. This is in contrast to human and rabbit M\u00fcller cells, which have been shown to undergo dramatic changes of their membrane physiology in response to retinal diseases and injuries. GLIA 34:190\u2013199, 2001. \u00a9 2001 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/glia.1053","type":"journal-article","created":{"date-parts":[[2002,9,10]],"date-time":"2002-09-10T22:53:09Z","timestamp":1031698389000},"page":"190-199","source":"Crossref","is-referenced-by-count":34,"title":["Electrophysiological properties of rat retinal M\u00fcller (glial) cells in postnatally developing and in pathologically altered retinae"],"prefix":"10.1002","volume":"34","author":[{"given":"Felix","family":"Felmy","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas","family":"Pannicke","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J\u00fcrgen 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