Abstract
The biosynthesis of brain membrane phosphatides, e.g., phosphatidylcholine (PtdCho), may utilize three circulating compounds: choline, uridine (a precursor for UTP, CTP, and CDP-choline), and a PUFA (e.g., docosahexaenoic acid); moreover, oral administration of the uridine source uridine-5′-monophosphate (UMP) can significantly increase levels of the phosphatides throughout the rodent brain. Since PtdCho can provide choline for acetylcholine (ACh) synthesis, we determined whether UMP administration also affects ACh levels in striatum and striatal extracellular fluid, in aged and young rats. Among aged animals consuming a UMP-containing diet (2.5%, w/w) for 1 or 6 weeks, baseline ACh levels in striatal dialysates rose from 73 fmol/min to 148 or 197 fmol/min (P < 0.05). Consuming a lower dose (0.5%) for 1 week produced a smaller but still significant increase (from 75 to 92 fmol/min, P < 0.05), and elevated striatal ACh content (by 16%; P < 0.05). Dietary UMP (0.5%, 1 week) also amplified the increase in ACh caused by giving atropine (10 μM in the aCSF); atropine alone increased ACh concentrations from 81 to 386 fmol/min in control rats and from 137 to 680 fmol/min in those consuming UMP (P < 0.05). Young rats eating the UMP-containing diet exhibited similar increases in basal ECF ACh (from 105 to 118 fmol/min) and in the increase produced by atropine (from 489 to 560 fmol/min; P < 0.05). These data suggest that giving a uridine source may enhance some cholinergic functions, perhaps by increasing brain phosphatide levels.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 42-48 |
| Number of pages | 7 |
| Journal | Brain Research |
| Volume | 1133 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 16 2007 |
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Keywords
- Acetylcholine
- Aged rat
- CDP-choline
- Microdialysis
- Phosphatidylcholine
- Uridine
ASJC Scopus subject areas
- Neuroscience(all)
- Molecular Biology
- Clinical Neurology
- Developmental Biology
Cite this
Dietary supplementation with uridine-5′-monophosphate (UMP), a membrane phosphatide precursor, increases acetylcholine level and release in striatum of aged rat. / Wang, Lei; Albrecht, Meredith A.; Wurtman, Richard J.
In: Brain Research, Vol. 1133, No. 1, 16.01.2007, p. 42-48.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Dietary supplementation with uridine-5′-monophosphate (UMP), a membrane phosphatide precursor, increases acetylcholine level and release in striatum of aged rat
AU - Wang, Lei
AU - Albrecht, Meredith A.
AU - Wurtman, Richard J.
PY - 2007/1/16
Y1 - 2007/1/16
N2 - The biosynthesis of brain membrane phosphatides, e.g., phosphatidylcholine (PtdCho), may utilize three circulating compounds: choline, uridine (a precursor for UTP, CTP, and CDP-choline), and a PUFA (e.g., docosahexaenoic acid); moreover, oral administration of the uridine source uridine-5′-monophosphate (UMP) can significantly increase levels of the phosphatides throughout the rodent brain. Since PtdCho can provide choline for acetylcholine (ACh) synthesis, we determined whether UMP administration also affects ACh levels in striatum and striatal extracellular fluid, in aged and young rats. Among aged animals consuming a UMP-containing diet (2.5%, w/w) for 1 or 6 weeks, baseline ACh levels in striatal dialysates rose from 73 fmol/min to 148 or 197 fmol/min (P < 0.05). Consuming a lower dose (0.5%) for 1 week produced a smaller but still significant increase (from 75 to 92 fmol/min, P < 0.05), and elevated striatal ACh content (by 16%; P < 0.05). Dietary UMP (0.5%, 1 week) also amplified the increase in ACh caused by giving atropine (10 μM in the aCSF); atropine alone increased ACh concentrations from 81 to 386 fmol/min in control rats and from 137 to 680 fmol/min in those consuming UMP (P < 0.05). Young rats eating the UMP-containing diet exhibited similar increases in basal ECF ACh (from 105 to 118 fmol/min) and in the increase produced by atropine (from 489 to 560 fmol/min; P < 0.05). These data suggest that giving a uridine source may enhance some cholinergic functions, perhaps by increasing brain phosphatide levels.
AB - The biosynthesis of brain membrane phosphatides, e.g., phosphatidylcholine (PtdCho), may utilize three circulating compounds: choline, uridine (a precursor for UTP, CTP, and CDP-choline), and a PUFA (e.g., docosahexaenoic acid); moreover, oral administration of the uridine source uridine-5′-monophosphate (UMP) can significantly increase levels of the phosphatides throughout the rodent brain. Since PtdCho can provide choline for acetylcholine (ACh) synthesis, we determined whether UMP administration also affects ACh levels in striatum and striatal extracellular fluid, in aged and young rats. Among aged animals consuming a UMP-containing diet (2.5%, w/w) for 1 or 6 weeks, baseline ACh levels in striatal dialysates rose from 73 fmol/min to 148 or 197 fmol/min (P < 0.05). Consuming a lower dose (0.5%) for 1 week produced a smaller but still significant increase (from 75 to 92 fmol/min, P < 0.05), and elevated striatal ACh content (by 16%; P < 0.05). Dietary UMP (0.5%, 1 week) also amplified the increase in ACh caused by giving atropine (10 μM in the aCSF); atropine alone increased ACh concentrations from 81 to 386 fmol/min in control rats and from 137 to 680 fmol/min in those consuming UMP (P < 0.05). Young rats eating the UMP-containing diet exhibited similar increases in basal ECF ACh (from 105 to 118 fmol/min) and in the increase produced by atropine (from 489 to 560 fmol/min; P < 0.05). These data suggest that giving a uridine source may enhance some cholinergic functions, perhaps by increasing brain phosphatide levels.
KW - Acetylcholine
KW - Aged rat
KW - CDP-choline
KW - Microdialysis
KW - Phosphatidylcholine
KW - Uridine
UR - http://www.scopus.com/inward/record.url?scp=33846304174&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33846304174&partnerID=8YFLogxK
U2 - 10.1016/j.brainres.2006.11.048
DO - 10.1016/j.brainres.2006.11.048
M3 - Article
C2 - 17184749
AN - SCOPUS:33846304174
VL - 1133
SP - 42
EP - 48
JO - Brain Research
JF - Brain Research
SN - 0006-8993
IS - 1
ER -