Biomedical subjects

Izabela Malinowska-Kołodziej

Publications and source records attributed to Izabela Malinowska-Kołodziej.

3 recordsLinked to original sources

PubMed2006

Expression of Bcl-2 and Bax protein in normal pineal gland in children and young adult.

The Bcl family contains both pro and antiapoptotic proteins participating in the regulation of neuronal cell death in several pathological conditions. However, very little is known about physiological profiles of Bcl-2/Bax expression in normal brain. In this study, we examined expression profile of Bcl-2 and Bax proteins in normal pineal gland in children. The material for analysis was obtained by biopsy of pineal parenchyma during surgery of pineal cysts. All specimens were labeled immunohistochemically and analyzed by means of confocal laser scanning microscope. We found only few Bcl-2 expressing (0.7%) and no Bax-immunopositive (0.0%) pinealocytes. Bcl-2-positive cells were mature neurons, neither young ones nor glia.

Adolescent↗

PubMed2006

Effect of oblique nerve grafting on peripheral nerve regeneration in rats.

Current methods of peripheral nerve repair are to rejoin cut nerve stumps directly or to bridge large gaps with autologous nerve grafts. In both cases the surface of nerve stump endings is typically cut perpendicularly to the long axis of the nerve. The outcome of such operations, however, is still not satisfactory. In this study, we examine the effect of oblique nerve cutting and grafting on morphological as well as functional features of regeneration. In adult rats, sciatic nerve was cut and rejoined either directly or using an autologous graft, at 90 degrees or 30 degrees angle. Functional regeneration was assessed by walking track analysis during 12-week follow-up. Afterwards muscle weight was measured and histological studies were performed. The latter included nerve fibers and Schwann cells counting, as well as visualization of scar formation and epineural fibrosis. Nerves cut obliquely and rejoined showed better functional recovery than perpendicularly transected. Similar effect was observed after oblique grafting when compared to perpendicular one. Numbers of nerve fibers growing into the distal stump of the nerve as well as the number of Schwann cells were significantly higher in obliquely than in perpendicularly operated nerves. Moreover, growing axons were arranged more regularly following oblique treatment. These data indicate that joining or grafting the nerve stumps at acute angle is a more profitable method of nerve repair than the standard procedure performed at right angle.

Animals↗

PubMed2006

[How estrogens will surprise us again?].

Estrogens are pleiotropic hormones having an influence not only on reproductive system and sexual functions. These hormones are synthesized not only by ovaries, but also by glia in central nervous system (CNS) and Schwann cells in peripheral nervous system. Therefore they create microenvironment having a wide spectrum of effects such as neuroprotective and antiapoptotic or supporting neurogenesis and regeneration. Mechanisms of estrogens activity are both genomic and quick non-genomic transmitted through second intracellular messengers. There is evidence for protective action of estrogens in neurodegenerative diseases and other diseases of CNS. Nevertheless there are still secrets in estrogens nature. This fact pushes us to ask more questions and continue scientific research to look for the answer.

Alzheimer Disease↗