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Articles by J. M Hollander
Total Records ( 12 ) for J. M Hollander
  J. C Frisbee , J. M Hollander , R. W Brock , H. G Yu and M. A. Boegehold
  Previous study suggests that with evolution of the metabolic syndrome, patterns of arteriolar reactivity are profoundly altered and may constrain functional hyperemia. This study investigated interactions between parameters of vascular reactivity at two levels of resistance arterioles in obese Zucker rats (OZR), translating these observations into perfusion regulation for in situ skeletal muscle. Dilation of isolated and in situ resistance arterioles from OZR to acetylcholine, arachidonic acid (AA), and hypoxia (isolated arterioles only) were blunted vs. lean Zucker rats (LZR), although dilation to adenosine was intact. Increased adrenergic tone (phenylephrine) or intralumenal pressure (ILP) impaired dilation in both strains (OZR>LZR). Treatment of OZR arterioles with Tempol (superoxide dismutase mimetic) or SQ-29548 (prostaglandin H2/thromboxane A2 receptor antagonist) improved dilator reactivity under control conditions and with increased ILP, but had minimal effect with increased adrenergic tone. Arteriolar dilation to adenosine was well maintained in both strains under all conditions. For in situ cremasteric arterioles, muscle contraction-induced elevations in metabolic demand elicited arteriolar dilations and hyperemic responses that were blunted in OZR vs. LZR, although distal parallel arterioles were characterized by heterogeneous dilator and perfusion responses. -Adrenoreceptor blockade improved outcomes at rest but had minimal effect with elevated metabolic demand. Treatment with Tempol or SQ-29548 had minimal impact at rest, but lessened distal arteriolar perfusion heterogeneity with increased metabolic demand. In blood-perfused gastrocnemius of OZR, perfusion was constrained primarily by adrenergic tone, while myogenic activation and endothelium-dependent dilation did not appear to contribute significantly to ischemia. These results of this novel, integrated approach suggest that adrenergic tone and metabolic dilation are robust determinants of bulk perfusion to skeletal muscle of OZR, while endothelial dysfunction may more strongly regulate perfusion distribution homogeneity via the impact of oxidant stress and AA metabolism.
  Y. C Lin , J Huang , Q Zhang , J. M Hollander , J. C Frisbee , K. H Martin , C Nestor , R Goodman and H. G. Yu

Ca2+ entry is delicately controlled by inactivation of L-type calcium channel (LTCC) composed of the pore-forming subunit 1C and the auxiliary subunits β1 and 2. Calmodulin is the key protein that interacts with the COOH-terminal motifs of 1C, leading to the fine control of LTCC inactivation. In this study we show evidence that a hyperpolarization-activated cyclic nucleotide-gated channel, HCN2, can act as a nonchannel regulatory protein to narrow the L-type Ca2+ channel current-voltage curve. In the absence of LTCC auxiliary subunits, HCN2 can induce 1C inactivation. Without 2, HCN2-induced fast inactivation of 1C requires calmodulin. With 2, the 1C/HCN2/2 channel inactivation does not require calmodulin. In contrast, β1-subunit plays a relatively minor role in the interaction of 1C with HCN2. The NH2 terminus of HCN2 and the IQ motif of 1C subunit are required for 1C/HCN2 channel interaction. Ca2+ channel inactivation is significantly slowed in hippocampus neurons (HNs) overexpressing HCN2 mutant lacking NH2 terminus and accelerated in HNs overexpressing the wild-type HCN2 compared with HN controls. Collectively, these results revealed a potentially novel protection mechanism for achieving the LTCC inactivation via interaction with HCN2.

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