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Steinunn Baekkeskov Hanahan

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Publications associées (59)

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Mechanism and effects of pulsatile GABA secretion from cytosolic pools in the human beta cell

Steinunn Baekkeskov Hanahan, Chiara Cianciaruso, Petra Catalina Schwalie, Edward Allen Phelps

Pancreatic beta cells synthesize and secrete the neurotransmitter GABA (gamma-aminobutyric acid) as a paracrine and autocrine signal to help regulate hormone secretion and islet homeostasis. Islet GABA release has classically been described as a secretory- ...

2019

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The target autoantigens in several organ-specific autoimmune diseases, including type 1 diabetes (T1D), are intracellular membrane proteins, whose initial encounter with the immune system is poorly understood. Here we propose a new model for how these prot ...

American Diabetes Association2017

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A robust and reproducible method for culturing monolayers of adherent and well-spread primary islet cells on glass coverslips is required for detailed imaging studies by super-resolution and livecell microscopy. Guided by an observation that dispersed isle ...

Springer Nature2017

Bioengineering strategies for inducing tolerance in autoimmune diabetes

Jeffrey Alan Hubbell, Steinunn Baekkeskov Hanahan, Edward Allen Phelps

Type 1 diabetes is an autoimmune disease marked by the destruction of insulin-producing beta cells in the pancreatic islets. Strategies to delay onset or prevent the autoimmune recognition of beta cell antigens or T cell-mediated killing of beta cells have ...

Elsevier Science Bv2017

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Pancreatic islet β-cells are particularly susceptible to endoplasmic reticulum (ER) stress, which is implicated in β-cell dysfunction and loss during the pathogenesis of type 1 diabetes (T1D). The peripheral membrane protein GAD65 is an autoantigen in huma ...

Amer Diabetes Assoc2016

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The inhibitory neurotransmitter GABA is synthesized by the enzyme glutamic acid decarboxylase (GAD) in neurons and in pancreatic β-cells in islets of Langerhans where it functions as a paracrine and autocrine signaling molecule regulating the function of i ...

Public Library of Science2015

Two distinct mechanisms target GAD67 to vesicular pathways and presynaptic clusters

Steinunn Baekkeskov Hanahan

T he inhibitory neurotransmitter gamma-amino butyric acid (GABA) is synthesized by two isoforms of the enzyme glutamic acid decarboxylase (GAD): GAD65 and GAD67. Whereas GAD67 is constitutively active and produces >90% of GABA in the central nervous system ...

Rockefeller University Press2010

MHC-class II genes determine susceptibility in human type-1 diabetes. In their context, presentation of target antigen(s) results in autoimmunity and b-cell destruction. An animal model, in which human b-cell autoantigen(s) are presented to effector cells ...

Elsevier2009

Palmitoylation cycles and regulation of protein function (Review)

Steinunn Baekkeskov Hanahan

The efficacy and success of many cellular processes is dependent on a tight orchestration of proteins trafficking to and from their site(s) of action in a time-controlled fashion. Recently, a dynamic cycle of palmitoylation/de-palmitoylation has been shown ...

Taylor & Francis2009

A palmitoylation cycle dynamically regulates partitioning of the GABA-synthesizing enzyme GAD65 between ER-Golgi and post-Golgi membranes

Steinunn Baekkeskov Hanahan

GAD65, the smaller isoform of the enzyme glutamic acid decarboxylase, synthesizes GABA for fine-tuning of inhibitory neurotransmission. GAD65 is synthesized as a soluble hydrophilic protein but undergoes a hydrophobic post-translational modification and be ...

Company of Biologists2008