Exploring a model role description for ethicists.

This paper provides a description of the role of the clinical ethicist as it is generally experienced in Canada. It examines the activities of Canadian ethicists working in healthcare institutions and the way in which their work incorporates more than ethics case consultation. The Canadian Bioethics Society established a "Taskforce on Working Conditions for Bioethics" (hereafter referred to as the Taskforce), to make recommendations on a number of issues affecting ethicists and to develop a model role description.

Biological activity of nerve growth factor precursor is dependent upon relative levels of its receptors.

Nerve growth factor (NGF) is produced as a precursor called pro-nerve growth factor (proNGF), which is secreted by many tissues and is the predominant form of NGF in the central nervous system. In Alzheimer disease brain, cholinergic neurons degenerate and can no longer transport NGF as efficiently, leading to an increase in untransported NGF in the target tissue. The protein that accumulates in the target tissue is proNGF, not the mature form.

Who's minding the shop? The role of Canadian research ethics boards in the creation and uses of registries and biobanks.

Background: The amount of research utilizing health information has increased dramatically over the last ten years. Many institutions have extensive biobank holdings collected over a number of years for clinical and teaching purposes, but are uncertain as to the proper circumstances in which to permit research uses of these samples. Research Ethics Boards (REBs) in Canada and elsewhere in the world are grappling with these issues, but lack clear guidance regarding their role in the creation of and access to registries and biobanks.

The nerve growth factor precursor proNGF exhibits neurotrophic activity but is less active than mature nerve growth factor.

Nerve growth factor (NGF) promotes neuronal survival and differentiation and stimulates neurite outgrowth. NGF is synthesized as a precursor, proNGF, which undergoes post-translational processing to generate mature beta-NGF. It has been assumed that, in vivo, NGF is largely processed into the mature form and that mature NGF accounts for the biological activity.

ProNGF: a neurotrophic or an apoptotic molecule?

Nerve growth factor (NGF) acts on various classes of central and peripheral neurons to promote cell survival, stimulate neurite outgrowth and modulate differentiation. NGF is synthesized as a precursor, proNGF, which undergoes processing to generate mature NGF. It has been assumed, based on studies in the mouse submandibular gland, that NGF in vivo is largely mature NGF, and that mature NGF accounts for the molecule's biological activity.