ライフサイエンスコーパス: neuromelanin

1 e most commonly used laboratory animals lack neuromelanin.

2 l is a well-established constituent of human neuromelanin.

3 ory species, such as rodents, do not produce neuromelanin.

4 omelanin imaging with silver nitrate-stained neuromelanin.

5 pools, leading to increased accumulation of neuromelanin.

6 -1451, such as neuronal monoamine oxidase or neuromelanin.

7 midbrain containing dopaminergic neurons and neuromelanin.

8 tation, rather than direct quantification of neuromelanin.

9 ons store iron in the form of ferrous ion or neuromelanin.

10 levels of the dopamine-derived brain pigment neuromelanin.

11 resent in iron-free and iron-laden synthetic neuromelanin.

12 derivatives that may serve as precursors to neuromelanin.

13 tantia nigra tissue and in various synthetic neuromelanins.

14 Neuromelanin accumulation in midbrain dopaminergic nucle

15 Furthermore, neuromelanin accumulation induced an endogenous synuclei

16 e group level differences in KOR expression, neuromelanin accumulation or relationships of these to p

17 osinase gene for triggering a time-dependent neuromelanin accumulation within substantia nigra pars c

18 We hypothesized that neuromelanin accumulation would be higher in patients th

19 f endogenous alpha-synuclein is triggered by neuromelanin accumulation, therefore any therapeutic app

20 ive association between KOR availability and neuromelanin accumulation.

21 cluding dopamine-specific phenotypes such as neuromelanin accumulation.

22 fied into five types-eumelanin, pheomelanin, neuromelanin, allomelanin, and pyomelanin-based on the v

23 irect, label-free nanoscale visualization of neuromelanin and associated metal ions in human brain ti

24 Neuromelanin and iron sensitive MRI and dopamine transpo

25 is of striatal dopamine and iron, and nigral neuromelanin and iron; in Parkinson's disease patients,

26 dized dopamine species that can convert into neuromelanin and maintained intracellular neuromelanin l

27 ere employed to investigate the influence of neuromelanin and myelin on the QSM findings in 99 partic

28 t spatial changes in dopamine-iron, dopamine-neuromelanin and neuromelanin-iron in the substantia nig

29 is review paper, we examine basic aspects of neuromelanin and neuromelanin-sensitive MRI and focus on

30 ause magnetic susceptibility is increased by neuromelanin and reduced by myelin, neuromelanin-sensiti

31 Furthermore, we observed reduced numbers of neuromelanin+ and tyrosine-hydroxylase (TH)+ DA neurons

32 [F-18]-AV-1451 off-target binding to neuromelanin- and melanin-containing cells and, to a les

33 ghtly different in the natural and synthetic neuromelanin, are both approximately 2.0 A.

34 se findings suggest that lower levels of non-neuromelanin-bound iron in the SN-VTA contribute to stri

35 f the NM-MRI contrast is not the presence of neuromelanin but the high-water content in the dopaminer

36 in-producing rodents, we recently found that neuromelanin can trigger Parkinson's disease pathology w

37 ; a finding similar to our earlier report in neuromelanin cells from the substantia nigra of restless

38 D, not disease duration, whereas the loss of neuromelanin cells is significantly correlated only with

39 owed by abnormal iron metabolism and finally neuromelanin changes in the substantia nigra pars compac

40 tionship of similar strength between loss of neuromelanin containing cells and the clinical symptoms

41 = 0.0006, t = 4.25, df = 15) in the size of neuromelanin containing cells in PD patients, but no dif

42 us and correlated positively with numbers of neuromelanin-containing (noradrenergic) cells along the

43 s coeruleus, paralleling an uneven number of neuromelanin-containing (noradrenergic) neurons througho

44 11C-PE2I, to assess the association between neuromelanin-containing cell levels in the substantia ni

45 t negative correlation between the number of neuromelanin-containing cells at a given level and age (

46 ralleled by a similar uneven distribution of neuromelanin-containing cells in both major depressives

47 of DAT-containing neurons to total number of neuromelanin-containing cells in each subject's sample.

48 tem histochemical staining showed absence of neuromelanin-containing cells in the basal ganglia, indi

49 2-adrenoceptors coordinately with counts of neuromelanin-containing cells in tissue sections cryocut

50 ignificant correlation between the number of neuromelanin-containing cells per section and the specif

51 ration of binding and the greatest number of neuromelanin-containing cells per section occurred near

52 Both the binding of [125I]PIC and number of neuromelanin-containing cells were differentially distri

53 striatal dopaminergic function, and loss of neuromelanin-containing dopaminergic neurons and increas

54 s, we observed the presence of ApoE-positive neuromelanin-containing dopaminergic neurons in substant

55 auses that produce massive cell death of the neuromelanin-containing dopaminergic neurons of the subs

56 tal age-related neurofibrillary tangles) and neuromelanin-containing neurons in the substantia nigra

57 mined, expression was highly elevated within neuromelanin-containing neurons of the substantia nigra

58 n the midbrain, AKR7A2 was found in glia and neuromelanin-containing neurons of the substantia nigra,

59 ignificant correlation between the number of neuromelanin-containing neurons per section and the spec

60 he 35% and 41% reductions in total number of neuromelanin-containing neurons seen in middle-aged and

61 f the neuromelanin pigment and/or density of neuromelanin-containing neurons, while recent studies su

62 htly stained; and type 3, DAT-immunonegative neuromelanin-containing perikarya.

63 ortem data showing asynchrony in the loss of neuromelanin-containing versus tyrosine hydroxylase posi

64 These neurons survive with their neuromelanin content for a lifetime but can also be affe

65 'Spatiotemporal changes in substantia nigra neuromelanin content in Parkinson's disease', by Biondet

66 Neuromelanin content is thought to reflect the loss of p

67 us ceruleus neurons were identified by their neuromelanin content.

68 Because neuromelanin derives from the oxidation of free cytosoli

69 In contrast to humans, neuromelanin does not appear spontaneously in most anima

70 together with a progressive degeneration of neuromelanin-expressing dopaminergic neurons.

71 ironment of the iron site in natural (human) neuromelanin extracted from substantia nigra tissue and

72 previously overlooked cellular organelles in neuromelanin formation and function.

73 Neuromelanin granules are yet only partially characteris

74 first time to isolate a sufficient amount of neuromelanin granules for global proteomics analysis fro

75 viously published global proteome studies of neuromelanin granules in human substantia nigra required

76 To clarify the exact function of neuromelanin granules in humans, their enrichment and in

77 ribed findings, supporting the connection of neuromelanin granules to iron homeostasis and lysosomes

78 pha-synuclein misfolding in PD which renders neuromelanin granules vulnerable, and can exacerbates ot

79 000 proteins were identified associated with neuromelanin granules.

80 pecific enrichment and proteomic analysis of neuromelanin granules.

81 ectrometry for the isolation and analysis of neuromelanin granules.

82 The limited quantities of neuromelanin has made understanding its normal biology d

83 We suggest that locus coeruleus neuromelanin imaging offers a marker of noradrenergic ca

84 generative conditions, as observed using new neuromelanin imaging techniques.

85 Here, we used neuromelanin imaging to localize the LC and quantified L

86 nsecutive brain sections by correlating STXM neuromelanin imaging with silver nitrate-stained neurome

87 unctional magnetic resonance imaging (fMRI), neuromelanin imaging, and pupillometry, we show that aro

88 all amounts of cytosolic DA are converted to neuromelanin in a stepwise process involving melanizatio

89 We review the development of neuromelanin in dopamine versus noradrenaline neurons an

90 phy to visualize the concentration of nigral neuromelanin in Parkinson's disease and correlated the f

91 We discuss the role of neuromelanin in stimulating endogenous alpha-synuclein m

92 e ligand (18)F-AV-1451 ((18)F-T807) binds to neuromelanin in the midbrain, and may therefore be a mea

93 Humans accumulate with age the pigment neuromelanin inside neurons that synthesize catecholamin

94 s accumulate with age the dark-brown pigment neuromelanin inside specific neuronal groups.

95 performed to assess nigrostriatal levels of neuromelanin, iron, and dopamine.

96 in dopamine-iron, dopamine-neuromelanin and neuromelanin-iron in the substantia nigra pars compacta.

97 Neuromelanin is a complex polymer pigment found primaril

98 Although neuromelanin is a dark pigment characteristic of dopamin

99 Neuromelanin is a unique pigment made by some human cate

100 nglia, indicating that off-target binding to neuromelanin is an insufficient explanation of 18F-AV-14

101 romelanin-pigmented neurons, but the role of neuromelanin is unclear.

102 Neurons with the highest neuromelanin levels are particularly susceptible to dege

103 to neuromelanin and maintained intracellular neuromelanin levels below their pathogenic threshold.

104 rate associations between KOR expression and neuromelanin levels in patients.

105 rkinson's disease subjects displayed reduced neuromelanin levels in the ventral (-30 +/- 28%) and dor

106 ny therapeutic approach intended to decrease neuromelanin levels may provide appealing choices for th

107 Neurons reaching the highest neuromelanin levels preferentially degenerate in Parkins

108 mbryonic stem cells, our human MLOs produced neuromelanin-like granules that were structurally simila

109 Conclusion PD-induced neuromelanin loss can be quantified across imaging proto

110 )F-flortaucipir has been reported to bind to neuromelanin, monoamine oxidase, calcifications, iron, l

111 ne; imaging techniques such as free-water or neuromelanin MRI may objectively track decline in Parkin

112 Future studies should explore the utility of neuromelanin-MRI biomarkers to identify early risk prior

113 de the first demonstration of the utility of neuromelanin-MRI in pediatric psychiatry, specifically h

114 Neuromelanin-MRI likely indexes accumulating alterations

115 S did not exhibit a significant elevation in neuromelanin-MRI signal (241 SN/VTA voxels had elevated

116 1, d = 1.44), neither baseline nor change in neuromelanin-MRI signal associated with symptom improvem

117 CUD was associated with elevated neuromelanin-MRI signal in a set of ventral SN/VTA voxel

118 CUD was also associated with elevated neuromelanin-MRI signal in the psychosis-related region

119 Voxel-wise analyses identified that neuromelanin-MRI signal was higher among children with O

120 urden of CUD symptoms associated with higher neuromelanin-MRI signal, F1, 96 = 4.89; P = .03).

121 ation (t = -2.22, p = 0.03) related to lower neuromelanin-MRI signal.

122 There was no association between time and neuromelanin-MRI signal.

123 xed-effects analyses were performed relating neuromelanin-MRI signals to clinical measures.

124 Neuromelanin-MRI signals within the midbrain (substantia

125 ine hydroxylase immunoreactivity (TH-ir) and neuromelanin (NM) content revealed no difference in cell

126 In contrast, neuromelanin (NM) is found in deep brain regions, specif

127 Neuromelanin (NM) isolated from the substantia nigra reg

128 ive o-quinone species that are precursors of neuromelanin (NM) pigment and under pathological conditi

129 Neuromelanin (NM), a product of dopamine metabolism in t

130 I (NM-MRI) purports to detect the content of neuromelanin (NM), a product of dopamine metabolism that

131 e initiation of melanoma, whereas, increased neuromelanin (NM), the melanin synthesized in dopaminerg

132 The replacement of neuromelanin (NM)-containing DAergic neurons in the subs

133 Neuromelanin (NM)-sensitive magnetic resonance imaging p

134 factors released from microglia activated by neuromelanin or alpha-synuclein, or high cytosolic DA an

135 he temporal ordering of changes in dopamine, neuromelanin or iron relative to controls; and voxel-wis

136 Molecules related to the neuromelanin pathway were found to be significantly incr

137 te NM-MRI measurements to the content of the neuromelanin pigment and/or density of neuromelanin-cont

138 n inverse relationship between VMAT2 ISI and neuromelanin pigment in the N1 and III neurons; 3) there

139 In vitro data indicate that neuromelanin pigment is formed from the excess cytosolic

140 Neuromelanin pigment is stored in granules including a p

141 rea (VTA) of humans and mice by using either neuromelanin pigment or immunolabeling with tyrosine hyd

142 l SN neurons also contain significantly more neuromelanin pigment than the dopaminergic neurons in th

143 t the ventral SN neurons accumulate the most neuromelanin pigment, in part because they have the leas

144 in neurons that contain different amounts of neuromelanin pigment.

145 that, in parallel to progressive human-like neuromelanin pigmentation, these animals display age-rel

146 and 7 normal brains were used for a study of neuromelanin pigmented cell loss.

147 lmark of Parkinson's disease is the death of neuromelanin-pigmented neurons, but the role of neuromel

148 ce to the depigmentation and degeneration of neuromelanin-pigmented noradrenergic cell bodies in the

149 We find that ATF4 levels are increased in neuromelanin-positive neurons in the substantia nigra of

150 magnetic resonance imaging (MRI), in view of neuromelanin present in noradrenergic neurons of older a

151 lar encapsulation in the substantia nigra of neuromelanin-producing rats by viral vector-mediated ove

152 Using humanized neuromelanin-producing rodents, we recently found that n

153 al of modulating age-dependent intracellular neuromelanin production in vivo, thereby opening an unex

154 Decreased neuromelanin production was associated with an attenuati

155 understood varieties of melanin: eumelanin, neuromelanin, pyomelanin, allomelanin, and pheomelanin.

156 Neuromelanin-related volumes of the anterior and posteri

157 ation of hemosiderin (posterior portion) and neuromelanin (remainder).

158 The in situ characterization of neuromelanin remains dependent on detectable pigmentatio

159 ver the life span in the same subjects using neuromelanin sensitive MRI.

160 Neuromelanin-sensitive (NM)-MRI offers a non-invasive ap

161 iatum, metabolic imaging, and free-water and neuromelanin-sensitive imaging in the posterior substant

162 gnetic resonance imaging (diffusion imaging, neuromelanin-sensitive imaging, iron-sensitive imaging,

163 teen healthy control subjects also underwent neuromelanin-sensitive imaging.

164 between a proxy measure of dopamine function-neuromelanin-sensitive magnetic resonance imaging (NM-MR

165 The authors collected neuromelanin-sensitive magnetic resonance imaging (NM-MR

166 Furthermore, they indicate the promise of neuromelanin-sensitive magnetic resonance imaging as a n

167 DSM-5, and neuroimaging measures included a neuromelanin-sensitive magnetic resonance imaging scan t

168 Neuromelanin-sensitive magnetic resonance imaging was us

169 Using high-resolution, neuromelanin-sensitive magnetic resonance imaging, we fo

170 d 7 T imaging of the locus coeruleus using a neuromelanin-sensitive magnetization transfer sequence.

171 30 control subjects) were investigated with neuromelanin-sensitive MR imaging by using two different

172 eased by neuromelanin and reduced by myelin, neuromelanin-sensitive MRI (NM-MRI) and diffusion tensor

173 Recent evidence supports the use of neuromelanin-sensitive MRI (NM-MRI) as a novel tool to i

174 Neuromelanin-sensitive MRI (NM-MRI) purports to detect t

175 Neuromelanin-sensitive MRI (NM-MRI), which indirectly me

176 sing a method to index LC integrity in vivo, neuromelanin-sensitive MRI (NM-MRI).

177 h (6-14-year-olds) completed high-resolution neuromelanin-sensitive MRI across two sites; n = 64 had

178 we examine basic aspects of neuromelanin and neuromelanin-sensitive MRI and focus on its psychiatric

179 In this cross-sectional study, we used neuromelanin-sensitive MRI and the highly specific dopam

180 Finally, novel MRI sequences as neuromelanin-sensitive MRI are promising new tools to st

181 This is the first study to utilize neuromelanin-sensitive MRI as a proxy for dopaminergic f

182 Emerging data suggest the utility of neuromelanin-sensitive MRI as a proxy measure for variab

183 -the-art research into the mechanisms of the neuromelanin-sensitive MRI contrast, standardized protoc

184 In conclusion, neuromelanin-sensitive MRI enabled us to assess voxel-wi

185 rrelations between signal-to-noise ratios on neuromelanin-sensitive MRI in patients with iRBD and Par

186 Neuromelanin-sensitive MRI is a burgeoning non-invasive

187 psychiatric disorders and their treatments, neuromelanin-sensitive MRI is ideally positioned as an i

188 Neuromelanin-sensitive MRI sequences and PET tracers hav

189 to investigate the spatiotemporal changes in neuromelanin-sensitive MRI signal in the substantia nigr

190 Voxel-wise patterns of correlation between neuromelanin-sensitive MRI signal-to-noise ratio and mot

191 ers compared to idiopathic PD patients using neuromelanin-sensitive MRI technique (NM-MRI).

192 to measure cardiac sympathetic innervation, neuromelanin-sensitive MRI to measure the integrity of l

193 Longitudinal T1-weighted anatomical and neuromelanin-sensitive MRI was performed in two cohorts,

194 diffusion, iron-sensitive susceptibility and neuromelanin-sensitive sequences potentially represents

195 ls and 53 Parkinson's disease patients) with neuromelanin-sensitive turbo spin-echo MRI and calculate

196 the striatum; metabolic imaging; free-water, neuromelanin-sensitive, and iron-sensitive imaging in th

197 lay out important future directions to allow neuromelanin-sensitive-MRI to fulfill its potential as a

198 ance the feasibility and predictive power of neuromelanin-sensitive-MRI-based tools.

199 imaging to localize the LC and quantified LC neuromelanin signal (NMS) intensity in 44 current cocain

200 The neuromelanin signal changes appeared to start in the pos

201 on of the locus coeruleus showed the largest neuromelanin signal decrease in the patients compared to

202 Given evidence of increased neuromelanin signal in pediatric OCD but negative associ

203 Purpose To investigate the pattern of neuromelanin signal intensity loss within the substantia

204 sessed whether the intracellular build-up of neuromelanin that occurs with age can be slowed down in

205 ins (such as amyloid-beta peptide [Abeta] or neuromelanin) that lead to oxidative stress have emerged

206 Results Reduction of normalized neuromelanin volume in PD was most pronounced in the pos

207 Normalized neuromelanin volume loss of the posterior and whole SNpc

208 Normalized neuromelanin volume of the anterior, posterior, and whol

209 Diagnostic test performance of normalized neuromelanin volume was investigated by using receiver o

210 gmental area were determined, and normalized neuromelanin volumes were assessed for protocol-dependen

211 odality is sensitive to the concentration of neuromelanin, which is synthesized from intracellular ca

212 man age-dependent brain-wide distribution of neuromelanin within catecholaminergic regions, based on

213 XM), through a characteristic feature in the neuromelanin x-ray absorption spectrum at 287.4 eV that