LMO4 is a transcription cofactor expressed during retinal development and in amacrine neurons at birth. A previous study in zebrafish reported that morpholino RNA ablation of one of two related genes, LMO4b, increases the size of the eye in embryos. However, the significance of LMO4 in mammalian eye development and function remained unknown since LMO4 null mice die prior to birth. We observed the presence of a smaller eye and/or coloboma in ~40% of LMO4 null mouse embryos. To investigate the postnatal role of LMO4 in retinal development and function, LMO4 was conditionally ablated in retinal progenitor cells using the Pax6 alpha-enhancer Cre/LMO4flox mice. We found that these mice have fewer Bhlhb5-positive GABAergic amacrine and OFF-cone bipolar cells. The deficit appears to affect the postnatal wave of Bhlhb5+ neurons, suggesting a temporal requirement for LMO4 in retinal neuron development. In contrast, cholinergic and dopaminergic amacrine, rod bipolar and photoreceptor cell numbers were not affected. The selective reduction in these interneurons was accompanied by a functional deficit revealed by electroretinography, with reduced amplitude of b-waves, indicating deficits in the inner nuclear layer of the retina. Thus, LMO4 is necessary for normal GABAergic amacrine and OFF-cone bipolar cell development during retina development.

LMO4 is a transcription cofactor expressed during retinal development and in amacrine neurons at birth. A previous study in zebrafish reported that morpholino RNA ablation of one of two related genes, LMO4b, increases the size of the eye in embryos. However, the significance of LMO4 in mammalian eye development and function remained unknown since LMO4 null mice die prior to birth. We observed the presence of a smaller eye and/or coloboma in ~40% of LMO4 null mouse embryos. To investigate the postnatal role of LMO4 in retinal development and function, LMO4 was conditionally ablated in retinal progenitor cells using the Pax6 alpha-enhancer Cre/LMO4flox mice. We found that these mice have fewer Bhlhb5-positive GABAergic amacrine and OFF-cone bipolar cells. The deficit appears to affect the postnatal wave of Bhlhb5+ neurons, suggesting a temporal requirement for LMO4 in retinal neuron development. In contrast, cholinergic and dopaminergic amacrine, rod bipolar and photoreceptor cell numbers were not affected. The selective reduction in these interneurons was accompanied by a functional deficit revealed by electroretinography, with reduced amplitude of b-waves, indicating deficits in the inner nuclear layer of the retina. Thus, LMO4 is necessary for normal GABAergic amacrine and OFF-cone bipolar cell development during retina development.

LMO4 is a transcription cofactor expressed during retinal development and in amacrine neurons at birth. A previous study in zebrafish reported that morpholino RNA ablation of one of two related genes, LMO4b, increases the size of the eye in embryos. However, the significance of LMO4 in mammalian eye development and function remained unknown since LMO4 null mice die prior to birth. We observed the presence of a smaller eye and/or coloboma in ~40% of LMO4 null mouse embryos. To investigate the postnatal role of LMO4 in retinal development and function, LMO4 was conditionally ablated in retinal progenitor cells using the Pax6 alpha-enhancer Cre/LMO4flox mice. We found that these mice have fewer Bhlhb5-positive GABAergic amacrine and OFF-cone bipolar cells. The deficit appears to affect the postnatal wave of Bhlhb5+ neurons, suggesting a temporal requirement for LMO4 in retinal neuron development. In contrast, cholinergic and dopaminergic amacrine, rod bipolar and photoreceptor cell numbers were not affected. The selective reduction in these interneurons was accompanied by a functional deficit revealed by electroretinography, with reduced amplitude of b-waves, indicating deficits in the inner nuclear layer of the retina. Thus, LMO4 is necessary for normal GABAergic amacrine and OFF-cone bipolar cell development during retina development.

LMO4 is a transcription cofactor expressed during retinal development and in amacrine neurons at birth. A previous study in zebrafish reported that morpholino RNA ablation of one of two related genes, LMO4b, increases the size of the eye in embryos. However, the significance of LMO4 in mammalian eye development and function remained unknown since LMO4 null mice die prior to birth. We observed the presence of a smaller eye and/or coloboma in ~40% of LMO4 null mouse embryos. To investigate the postnatal role of LMO4 in retinal development and function, LMO4 was conditionally ablated in retinal progenitor cells using the Pax6 alpha-enhancer Cre/LMO4flox mice. We found that these mice have fewer Bhlhb5-positive GABAergic amacrine and OFF-cone bipolar cells. The deficit appears to affect the postnatal wave of Bhlhb5+ neurons, suggesting a temporal requirement for LMO4 in retinal neuron development. In contrast, cholinergic and dopaminergic amacrine, rod bipolar and photoreceptor cell numbers were not affected. The selective reduction in these interneurons was accompanied by a functional deficit revealed by electroretinography, with reduced amplitude of b-waves, indicating deficits in the inner nuclear layer of the retina. Thus, LMO4 is necessary for normal GABAergic amacrine and OFF-cone bipolar cell development during retina development.

Synaptic activity can encode and store information in the brain through changes in synaptic strength as well as by control of gene expression. One corollary challenge becomes identifying these activity-dependent regulatory proteins and the underlying mechanisms associated with neuronal functions. By using biochemical, electrophysiological and behavioral approaches in combination with genetic and pharmacological manipulation, I report that LIM domain only 4 (LMO4) is a key regulator of calcium induced calcium release (CICR) and protein tyrosine phosphatase 1B (PTP1B) in the hippocampus and amygdala, respectively. Neuronal ablation of LMO4 in the glutamatergic neurons (LMO4KO) was associated with reduced promoter activity, mRNA, and protein expression of ryanodine receptor 2 (RyR2), suggesting the involvement of LMO4 in the transcriptional regulation. CICR function in LMO4KO mice was severely compromised, reflected by inefficient CICR-mediated electrophysiological responses including afterhyperpolarization, calcium rise from internal stores and glutamate release probability. These changes were accompanied with impaired hippocampal long term potentiation (LTP) and hippocampal-dependent spatial learning ability. LMO4 was also shown to exert a cytoplasmic regulation as an endogenous inhibitor for PTP1B that accounts for tyrosine dephosphorylation of mGluR5 in the amygdala. LMO4KO mice had elevated PTP1B activity and decreased mGluR endocannabinoid signaling, resulting in a profound anxiety phenotype. The potential clinical value of PTP1B/LMO4 is promising, given that intra-amygdala injection of the PTP1B inhibitor Trodusquemine or a PTP1B shRNA alleviated anxiety by restoring eCB signal in LMO4KO mice. Thus this study identified PTP1B as a potential therapeutic target for anxiety, besides the previous findings of its association with obesity and diabetes. Moreover, this PTP1B-mediated anxiety may be a general mechanism during chronic stress. Collectively, these findings identify that LMO4 plays an essential role for non-genomic and genomic regulation in central neurons, providing a mechanism for LMO4 to modulate a wide range of neuronal functions and behavior.

Metabolic homeostasis is orchestrated by the hypothalamus through the neuroendocrine and the autonomic nervous systems. The hypothalamic nuclei respond to the peptide leptin secreted from adipose tissue to suppress feeding and increase energy expenditure by promoting fat metabolism via sympathetic activity. Another important, but perhaps less appreciated function of central leptin signaling is to elevate peripheral insulin sensitivity. Environmental and genetic risk factors that affect hypothalamic leptin signaling can lead to obesity and type 2 diabetes mellitus (T2DM). Here, we discovered that LIM domain only 4, LMO4, is a novel protein participating in central leptin signaling. In a process strikingly similar to T2DM in humans, CaMKIIα-Cre;LMO4flox/flox mice, which have LMO4 knocked out in the postnatal brain including the hypothalamus, develop visceral adiposity, reduced insulin sensitivity, obesity and diabetes when fed with regular chow. Central leptin signaling was significantly lost in key hypothalamic nuclei of mutant mice. Caloric restriction prevents obesity but not insulin resistance in these mice. Taken together, our results suggest that LMO4 function in the brain is required for central leptin signaling to control fat metabolism and peripheral insulin sensitivity.

Metabolic homeostasis is orchestrated by the hypothalamus through the neuroendocrine and the autonomic nervous systems. The hypothalamic nuclei respond to the peptide leptin secreted from adipose tissue to suppress feeding and increase energy expenditure by promoting fat metabolism via sympathetic activity. Another important, but perhaps less appreciated function of central leptin signaling is to elevate peripheral insulin sensitivity. Environmental and genetic risk factors that affect hypothalamic leptin signaling can lead to obesity and type 2 diabetes mellitus (T2DM). Here, we discovered that LIM domain only 4, LMO4, is a novel protein participating in central leptin signaling. In a process strikingly similar to T2DM in humans, CaMKIIα-Cre;LMO4flox/flox mice, which have LMO4 knocked out in the postnatal brain including the hypothalamus, develop visceral adiposity, reduced insulin sensitivity, obesity and diabetes when fed with regular chow. Central leptin signaling was significantly lost in key hypothalamic nuclei of mutant mice. Caloric restriction prevents obesity but not insulin resistance in these mice. Taken together, our results suggest that LMO4 function in the brain is required for central leptin signaling to control fat metabolism and peripheral insulin sensitivity.

Metabolic homeostasis is orchestrated by the hypothalamus through the neuroendocrine and the autonomic nervous systems. The hypothalamic nuclei respond to the peptide leptin secreted from adipose tissue to suppress feeding and increase energy expenditure by promoting fat metabolism via sympathetic activity. Another important, but perhaps less appreciated function of central leptin signaling is to elevate peripheral insulin sensitivity. Environmental and genetic risk factors that affect hypothalamic leptin signaling can lead to obesity and type 2 diabetes mellitus (T2DM). Here, we discovered that LIM domain only 4, LMO4, is a novel protein participating in central leptin signaling. In a process strikingly similar to T2DM in humans, CaMKIIα-Cre;LMO4flox/flox mice, which have LMO4 knocked out in the postnatal brain including the hypothalamus, develop visceral adiposity, reduced insulin sensitivity, obesity and diabetes when fed with regular chow. Central leptin signaling was significantly lost in key hypothalamic nuclei of mutant mice. Caloric restriction prevents obesity but not insulin resistance in these mice. Taken together, our results suggest that LMO4 function in the brain is required for central leptin signaling to control fat metabolism and peripheral insulin sensitivity.

Metabolic homeostasis is orchestrated by the hypothalamus through the neuroendocrine and the autonomic nervous systems. The hypothalamic nuclei respond to the peptide leptin secreted from adipose tissue to suppress feeding and increase energy expenditure by promoting fat metabolism via sympathetic activity. Another important, but perhaps less appreciated function of central leptin signaling is to elevate peripheral insulin sensitivity. Environmental and genetic risk factors that affect hypothalamic leptin signaling can lead to obesity and type 2 diabetes mellitus (T2DM). Here, we discovered that LIM domain only 4, LMO4, is a novel protein participating in central leptin signaling. In a process strikingly similar to T2DM in humans, CaMKIIα-Cre;LMO4flox/flox mice, which have LMO4 knocked out in the postnatal brain including the hypothalamus, develop visceral adiposity, reduced insulin sensitivity, obesity and diabetes when fed with regular chow. Central leptin signaling was significantly lost in key hypothalamic nuclei of mutant mice. Caloric restriction prevents obesity but not insulin resistance in these mice. Taken together, our results suggest that LMO4 function in the brain is required for central leptin signaling to control fat metabolism and peripheral insulin sensitivity.

No description available.