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544-31-0

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544-31-0 Usage

Description

Palmitoylethanolamide (PEA) is a fatty acid amide produced in the body that binds to and activates the peroxisome proliferator-activated receptor alpha (PPAR-α). It was initially described as an agonist to the type 2 cannabinoid receptor (CB2), though it is now recognized that PEA does not bind to cannabinoid receptors. PEA is known to have anti-inflammatory, analgesic, and neuroprotective properties. PEA supplements have been used by people with chronic pain as well as those with neuropathic pain.

Chemical Properties

Palmitoylethanolamide is a natural occurring lipid belonging to the class of autacoids. It is a fine white to yellow powder. PEA consists of palmitic acid and ethanolamine. It is the hydrolyzed form of N-(2-hydroxyethyl)-palmitamide, a crystalline structure isolated in soy lecithin. It is this hydrolyzed substance that accounts for the anti-inflammatory properties that were first noted by scientists in 1957. PEA's effects on the immune system have been studied since 1939.

Uses

Palmitoylethanolamide is a natural substance produced by the body and it is very effective and safe to use as a supplement for pain and reduce inflammation.PEA can be synthesized within the human body from the abundant fatty acid palmitic acid, but it is not dependent or influenced by dietary consumption of fatty acids. Palmitic acid in the diet is derived from dairy products such as cheese and butter, palm tree oil, and animal meat products. However, increasing palmitic acid in the hope of increasing endogenous PEA synthesis will not be effective.The anti-inflammatory properties of PEA are due to its ability to inhibit inflammation-causing proteins called cytokines. Cytokines are released during periods of inflammation. PEA can suppress the secretion of tumor necrosis factor alpha (TNF alpha), a cytokine, while also inhibiting the release of interleukins. Interleukins are a specific class of cytokines which belong in the immunological system and are activated during the process of inflammation.Chronic Pain and the Use of Palmitoylethanolamide: An Update

Definition

ChEBI: Palmitoylethanolamide is an N-(long-chain-acyl)ethanolamine that is the ethanolamide of palmitic (hexadecanoic) acid. It has a role as an anti-inflammatory drug, an antihypertensive agent, a neuroprotective agent and an anticonvulsant. It is a N-(long-chain-acyl)ethanolamine, an endocannabinoid and a N-(saturated fatty acyl)ethanolamine. It is functionally related to a hexadecanoic acid.

Biological Functions

Palmitoylethanolamide (PEA) is a fatty acid amide molecule involved in a variety of cellular functions in chronic pain and inflammation. It has been shown to have neuroprotective, anti-inflammatory, anti-nociceptive (antipain) and anti-convulsant properties. Often in people with chronic disorders, the body does not produce enough PEA, which causes problems.Taking PEA to supplement the body’s shortage is may be beneficial if you have chronic and neuropathic pain and inflammation, as has been demonstrated in clinical trials. These include peripheral neuropathies such as diabetic neuropathy, chemotherapy-induced peripheral neuropathy, carpal tunnel syndrome, sciatic pain, osteoarthritis, low-back pain, failed back surgery syndrome, dental pains, neuropathic pain in stroke and multiple sclerosis, chronic regional pain syndrome, chronic pelvic pain, postherpetic neuralgia, and vaginal pains.

Flammability and Explosibility

Notclassified

Biological Activity

Palmitoylethanolamide (PEA) is a natural fatty acid amide of ethanolamine and palmitic acid. It is found in soybeans, egg yolk, and many other food sources. PEA is an endogenous cannabinoid receptor agonist. It is a peroxisome proliferator-activated receptor α (PPAR-α) ligand. PEA possesses anti-inflammatory, anti-allergic, neuroprotective, and analgesic activities. It belongs to the class of lipid mediators and the N-acylethanolamine family. PEA blocks the release of pro-inflammatory mediators from activated mast cells and prevents the recruitment of activated mast cells at the site of nerve injury.

Side effects

Different sources of media describe the Side effects of 544-31-0 differently. You can refer to the following data:
1. There are no known problematic side-effects. PEA can be taken together with any other substance. It enhances the pain-relieving effect of classic analgesics and anti-inflammatories. Palmitoylethanolamide can be used in combination with other substances without any side effects.ARE THERE ANY SIDE EFFECTS
2. There are no known problematic side-effects. PEA can be taken together with any other substance. It enhances the pain-relieving effect of classic analgesics and anti-inflammatories. Palmitoylethanolamide can be used in combination with other substances without any side effects.

Check Digit Verification of cas no

The CAS Registry Mumber 544-31-0 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,4 and 4 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 544-31:
(5*5)+(4*4)+(3*4)+(2*3)+(1*1)=60
60 % 10 = 0
So 544-31-0 is a valid CAS Registry Number.
InChI:InChI=1/C18H37NO2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-18(21)19-16-17-20/h20H,2-17H2,1H3,(H,19,21)

544-31-0 Well-known Company Product Price

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  • Sigma

  • (P0359)  Palmitoylethanolamide  

  • 544-31-0

  • P0359-10MG

  • 840.06CNY

  • Detail
  • Sigma

  • (P0359)  Palmitoylethanolamide  

  • 544-31-0

  • P0359-50MG

  • 3,753.36CNY

  • Detail

544-31-0SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 19, 2017

Revision Date: Aug 19, 2017

1.Identification

1.1 GHS Product identifier

Product name palmitoyl ethanolamide

1.2 Other means of identification

Product number -
Other names N-(2-hydroxyethyl)hexadecanamide

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:544-31-0 SDS

544-31-0Synthetic route

ethanolamine
141-43-5

ethanolamine

1-hexadecylcarboxylic acid
57-10-3

1-hexadecylcarboxylic acid

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
Stage #1: 1-hexadecylcarboxylic acid In water at 100℃; for 2h;
Stage #2: ethanolamine In water at 100 - 200℃; for 22h;
98.2%
With Novozym 435 In 1,4-dioxane for 0.0666667h; Microwave irradiation; Enzymatic reaction; chemoselective reaction;97.3%
Stage #1: 1-hexadecylcarboxylic acid With 1,1'-carbonyldiimidazole In dichloromethane at 20℃; for 0.5h;
Stage #2: ethanolamine In dichloromethane for 12h;
96%
hexadecanoic acid ethyl ester
628-97-7

hexadecanoic acid ethyl ester

ethanolamine
141-43-5

ethanolamine

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
With Novozym 435 In 1,4-dioxane for 0.0666667h; Microwave irradiation; Enzymatic reaction; chemoselective reaction;97.5%
ethanolamine
141-43-5

ethanolamine

n-hexadecanoyl chloride
112-67-4

n-hexadecanoyl chloride

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
With triethylamine In dichloromethane a) 0 deg C, 30 min, b) RT, 2 h;97%
With magnesium oxide In tetrahydrofuran; water at 20℃; for 2h;92%
With sodium carbonate In diethyl ether
vinyl palmitate
693-38-9

vinyl palmitate

ethanolamine
141-43-5

ethanolamine

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
With sodium methylate at 60℃; for 1.5h; Neat (no solvent);96.5%
With sodium methylate at 60℃; for 1.5h; Concentration; Temperature; Time;
With potassium methanolate In methanol at 65℃; for 3h;
glyceroltripalmitate
555-44-2

glyceroltripalmitate

ethanolamine
141-43-5

ethanolamine

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
at 50 - 60℃; for 8h;95.4%
ethanolamine
141-43-5

ethanolamine

Stearoyl chloride
112-76-5

Stearoyl chloride

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
In dichloromethane at 20℃; for 1h; Cooling with ice;95%
ethanolamine
141-43-5

ethanolamine

C28H40N2O2
100663-86-3

C28H40N2O2

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
In dichloromethane for 2h; Ambient temperature;92%
1-(2-Thioxo-thiazolidin-3-yl)-hexadecan-1-one
74058-64-3

1-(2-Thioxo-thiazolidin-3-yl)-hexadecan-1-one

ethanolamine
141-43-5

ethanolamine

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
In dichloromethane for 0.333333h; Ambient temperature;91%
In dichloromethane for 0.333333h; Product distribution; Ambient temperature; other aminoalcohols and aminophenols in further solvents;91%
palmitic acid isopropyl ester
142-91-6

palmitic acid isopropyl ester

ethanolamine
141-43-5

ethanolamine

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
With sodium ethanolate In methanol; ethanol at 60℃; for 4h; Inert atmosphere;89%
N-hexadecanoyl glycine methyl ester
214706-34-0

N-hexadecanoyl glycine methyl ester

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
With lithium aluminium tetrahydride In tetrahydrofuran for 0.75h; Ambient temperature;
1-hexadecylcarboxylic acid
57-10-3

1-hexadecylcarboxylic acid

thorium oxide

thorium oxide

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: DCC-DMAP
2: 92 percent / CH2Cl2 / 2 h / Ambient temperature
View Scheme
n-hexadecanoyl chloride
112-67-4

n-hexadecanoyl chloride

ent-17-methyl-morphinan-3-ol

ent-17-methyl-morphinan-3-ol

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: Et3N
2: 92 percent / CH2Cl2 / 2 h / Ambient temperature
View Scheme
Multi-step reaction with 2 steps
1: Et3N / tetrahydrofuran / 20 h / Ambient temperature
2: LiAlH4 / tetrahydrofuran / 0.75 h / Ambient temperature
View Scheme
1-hexadecylcarboxylic acid
57-10-3

1-hexadecylcarboxylic acid

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: dicyclohexylcarbodiimide
2: 91 percent / CH2Cl2 / 0.33 h / Ambient temperature
View Scheme
Multi-step reaction with 2 steps
1: sulfuric acid
2: acetonitrile / 24 h
View Scheme
Multi-step reaction with 2 steps
1: oxalyl dichloride; N,N-dimethyl-formamide / dichloromethane / 3.5 h / 0 - 20 °C / Inert atmosphere
2: triethylamine / 3 h
View Scheme
ethanolamine
141-43-5

ethanolamine

palmitoyl ethyl carbonate
120246-99-3

palmitoyl ethyl carbonate

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
In dichloromethane at 0 - 10℃; Product distribution / selectivity;
In cyclohexane at 0 - 10℃; Product distribution / selectivity;
C18H34O4

C18H34O4

ethanolamine
141-43-5

ethanolamine

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
In dichloromethane at 20℃; Cooling with ice;
In chloroform at 0 - 10℃; Product distribution / selectivity;
C22H40O4

C22H40O4

ethanolamine
141-43-5

ethanolamine

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
In dichloromethane at 0 - 10℃; Product distribution / selectivity;
hexadecanoic acid methyl ester
112-39-0

hexadecanoic acid methyl ester

ethanolamine
141-43-5

ethanolamine

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Conditions
ConditionsYield
In acetonitrile for 24h;
In acetonitrile for 24h;
With zeolite H-beta-22 In hexane at 180℃; under 15001.5 Torr; for 3h; Reagent/catalyst; Inert atmosphere;
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

N-palmitoyl glycine
2441-41-0

N-palmitoyl glycine

Conditions
ConditionsYield
With sodium hypochlorite; 2,2,6,6-Tetramethyl-1-piperidinyloxy free radical; potassium chloride; sodium hydroxide In tetrahydrofuran; water for 1.5h; Reagent/catalyst; Industrial scale; Green chemistry;98.5%
t-Boc-L-valine
13734-41-3

t-Boc-L-valine

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-L-valinate

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-L-valinate

Conditions
ConditionsYield
With dicyclohexyl-carbodiimide In dichloromethane at 23℃; for 12h; Steglich Esterification; Inert atmosphere;95%
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

benzyl isothiocyanate
3173-56-6

benzyl isothiocyanate

N-[2-(benzylaminocarbonyl)-oxyethyl]-hexadecanamide

N-[2-(benzylaminocarbonyl)-oxyethyl]-hexadecanamide

Conditions
ConditionsYield
Stage #1: 2-(palmitoylamino)ethanol With 4 Å molecular sieves In toluene Heating / reflux;
Stage #2: benzyl isothiocyanate With 4 Å molecular sieves for 6h; Heating / reflux;
94%
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

chloroformic acid ethyl ester
541-41-3

chloroformic acid ethyl ester

N-[2-(ethoxycarbonyl)-oxyethyl]-hexadecanamide

N-[2-(ethoxycarbonyl)-oxyethyl]-hexadecanamide

Conditions
ConditionsYield
With 4-methyl-morpholine In tetrahydrofuran at 20 - 45℃; for 3h;93%
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

1-acetoxy-2-palmitoylamino-ethane
2495-72-9

1-acetoxy-2-palmitoylamino-ethane

Conditions
ConditionsYield
With acetic anhydride In pyridine93%
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Glycine ethyl ester isocyanate
2949-22-6

Glycine ethyl ester isocyanate

N-[[2-(ethoxycarbonylmethyl)-aminocarbonyl]-oxyethyl]-hexadecanamide

N-[[2-(ethoxycarbonylmethyl)-aminocarbonyl]-oxyethyl]-hexadecanamide

Conditions
ConditionsYield
Stage #1: 2-(palmitoylamino)ethanol With 4 Å molecular sieves In toluene Heating / reflux;
Stage #2: Glycine ethyl ester isocyanate With 4 Å molecular sieves for 6h; Heating / reflux;
92%
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

2-pentadecyl-2-oxazoline
36919-66-1

2-pentadecyl-2-oxazoline

Conditions
ConditionsYield
Stage #1: 2-(palmitoylamino)ethanol With thionyl chloride at 0 - 20℃; for 15.5h; Inert atmosphere;
Stage #2: With potassium tert-butylate In toluene at 40℃; for 2h;
92%
Multi-step reaction with 2 steps
1: thionyl chloride / 15.5 h / 0 - 20 °C / Inert atmosphere
2: potassium tert-butylate / toluene / 2 h / 40 °C
View Scheme
2,3-dihydro-2H-furan
1191-99-7

2,3-dihydro-2H-furan

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

tetrahydrofuranyl ether of N-(2-hydroxyethyl)-hexadecanamide

tetrahydrofuranyl ether of N-(2-hydroxyethyl)-hexadecanamide

Conditions
ConditionsYield
With pyridinium methanesulfonate at 4 - 50℃; for 1h;90%
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Boc-D-Val-OH
22838-58-0

Boc-D-Val-OH

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-D-valinate

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-D-valinate

Conditions
ConditionsYield
With dicyclohexyl-carbodiimide In dichloromethane at 23℃; for 12h; Steglich Esterification; Inert atmosphere;89%
L-N-Boc-Ala
15761-38-3

L-N-Boc-Ala

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-L-alaninate

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-L-alaninate

Conditions
ConditionsYield
With dicyclohexyl-carbodiimide In dichloromethane at 23℃; for 12h; Steglich Esterification; Inert atmosphere;84%
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

pyrophosphoric acid
14000-31-8

pyrophosphoric acid

N-Palmitoylethanolamine phosphate
84552-09-0

N-Palmitoylethanolamine phosphate

Conditions
ConditionsYield
In methanesulfonic acid83%
succinic acid anhydride
108-30-5

succinic acid anhydride

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

4-oxo-4-(2-palmitamidoethoxy)butanoic acid
117597-84-9

4-oxo-4-(2-palmitamidoethoxy)butanoic acid

Conditions
ConditionsYield
In N,N-dimethyl-formamide at 20℃; for 18h;83%
In N,N-dimethyl-formamide at 20℃; for 18h;83%
In tetrahydrofuran at 50℃;83%
N-(tert-butyloxycarbonyl)-L-isoleucine
13139-16-7

N-(tert-butyloxycarbonyl)-L-isoleucine

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-L-isoleucinate

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-L-isoleucinate

Conditions
ConditionsYield
With dicyclohexyl-carbodiimide In dichloromethane at 23℃; for 12h; Steglich Esterification; Inert atmosphere;81%
maleic anhydride
108-31-6

maleic anhydride

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

(E)-4-oxo-4-(2-palmitamidoethoxy)but-2-enoic acid

(E)-4-oxo-4-(2-palmitamidoethoxy)but-2-enoic acid

Conditions
ConditionsYield
In tetrahydrofuran at 50℃;80%
2,2,6,6-Tetramethyl-1-piperidinyloxy free radical
2564-83-2, 45842-10-2

2,2,6,6-Tetramethyl-1-piperidinyloxy free radical

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

triisopropylsilyl trifluoromethanesulfonate
80522-42-5

triisopropylsilyl trifluoromethanesulfonate

2-((2,2,6,6-tetramethylpiperidin-1-yl)oxy)-N-(2-((triisopropylsilyl)oxy)ethyl)hexadecanamide

2-((2,2,6,6-tetramethylpiperidin-1-yl)oxy)-N-(2-((triisopropylsilyl)oxy)ethyl)hexadecanamide

Conditions
ConditionsYield
With pyridine In hexane at 60℃; for 36h; chemoselective reaction;79%
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

Boc-Trp-OH
13139-14-5

Boc-Trp-OH

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-L-tryptophanate

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-L-tryptophanate

Conditions
ConditionsYield
With dicyclohexyl-carbodiimide In dichloromethane at 23℃; for 12h; Steglich Esterification; Inert atmosphere;77%
phthalic anhydride
85-44-9

phthalic anhydride

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

2-[(2-palmitamidoethoxy)carbonyl]benzoic acid
31384-20-0

2-[(2-palmitamidoethoxy)carbonyl]benzoic acid

Conditions
ConditionsYield
In tetrahydrofuran at 50℃;75%
In 1,4-dioxane at 40℃; for 5h;
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

N-t-butyloxycarbonyl-D-asparagine
7536-55-2, 142847-17-4, 75647-01-7

N-t-butyloxycarbonyl-D-asparagine

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-D-asparaginate

2-(palmitoylamino)ethyl N-tert-butoxycarbonyl-D-asparaginate

Conditions
ConditionsYield
With dicyclohexyl-carbodiimide In dichloromethane at 23℃; for 12h; Steglich Esterification; Inert atmosphere;66%
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

N-(2-azidoethyl)palmitamide
1192358-13-6

N-(2-azidoethyl)palmitamide

Conditions
ConditionsYield
With diphenyl phosphoryl azide; 1,8-diazabicyclo[5.4.0]undec-7-ene In N,N-dimethyl-formamide at 120℃; for 2h; Inert atmosphere;66%
indole-3-acetic acid
87-51-4

indole-3-acetic acid

2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

N-palmitoyl-O-(2-(indol-3-yl)-1-oxoethyl)ethanol-2-amine
1363333-30-5

N-palmitoyl-O-(2-(indol-3-yl)-1-oxoethyl)ethanol-2-amine

Conditions
ConditionsYield
With dmap; dicyclohexyl-carbodiimide In chloroform; acetone at 20℃; for 12h;65.7%
2-(palmitoylamino)ethanol
544-31-0

2-(palmitoylamino)ethanol

2-aminoethyl hexadecanoate
65260-72-2

2-aminoethyl hexadecanoate

Conditions
ConditionsYield
With carbon tetrabromide; triphenylphosphine In acetonitrile for 3.5h;65%

544-31-0Relevant articles and documents

Anandamide inhibits nuclear factor-κB activation through a cannabinoid receptor-independent pathway

Sancho, Rocio,Calzado, Marco A.,Di Marzo, Vincenzo,Appendino, Giovanni,Munoz, Eduardo

, p. 429 - 438 (2003)

Anandamide (arachidonoylethanolamine, AEA), an endogenous agonist for both the cannabinoid CB, receptor and the vanilloid VR1 receptor, elicits neurobehavioral, anti-inflammatory, immunomodulatory, and proapoptotic effects. Because of the central role of nuclear factor-κB (NF-κB) in the inflammatory process and the immune response, we postulated that AEA might owe some of its effects to the suppression of NF-κB. This study shows that AEA inhibits tumor necrosis factor-α (TNFα)-induced NF-κB activation by direct inhibition of the IκB kinase (IKK)β and, to a lesser extent, the IKKα subunits of κB inhibitor (IκB) kinase complex, and that IKKs inhibition by AEA correlates with inhibition of IκBα degradation, NF-κB binding to DNA, and NF-κB-dependent transcription in TNFα-stimulated cells. AEA also prevents NF-κB-dependent reporter gene expression induced by mitogen-activated protein kinase kinase kinase and NF-κB-inducing kinase. The NF-κB inhibitory activity of AEA was independent of CB1 and CB2 activation in TNFα-stimulated 5.1 and A549 cell lines, which do not express vanilloid receptor 1, and was not mediated by hydrolytic products formed through the activity of the enzyme fatty acid amide hydrolase. Chemical modification markedly affected AEA inhibitory activity on NF-κB, suggesting rather narrow structure-activity relationships and the specific interaction with a molecular target. Substitution of the alkyl moiety with less saturated fatty acids generally reduced or abolished activity. However, replacement of the ethanolamine "head" with a vanillyl group led to potent inhibition of TNFα-induced NF-κB-dependent transcription. These findings provide new mechanistic insights into the anti-inflammatory and proapoptotic activities of AEA, and should foster the synthesis of improved analogs amenable to pharmaceutical development as anti-inflammatory agents.

Different roles for the acyl chain and the amine leaving group in the substrate selectivity of N-Acylethanolamine acid amidase

Ghidini, Andrea,Scalvini, Laura,Palese, Francesca,Lodola, Alessio,Mor, Marco,Piomelli, Daniele

, p. 1411 - 1423 (2021/07/17)

N-acylethanolamine acid amidase (NAAA) is an N-terminal nucleophile (Ntn) hydrolase that catalyses the intracellular deactivation of the endogenous analgesic and anti-inflammatory agent palmitoylethanolamide (PEA). NAAA inhibitors counteract this process and exert marked therapeutic effects in animal models of pain, inflammation and neurodegeneration. While it is known that NAAA preferentially hydrolyses saturated fatty acid ethanolamides (FAEs), a detailed profile of the relationship between catalytic efficiency and fatty acid-chain length is still lacking. In this report, we combined enzymatic and molecular modelling approaches to determine the effects of acyl chain and polar head modifications on substrate recognition and hydrolysis by NAAA. The results show that, in both saturated and monounsaturated FAEs, the catalytic efficiency is strictly dependent upon fatty acyl chain length, whereas there is a wider tolerance for modifications of the polar heads. This relationship reflects the relative stability of enzyme-substrate complexes in molecular dynamics simulations.

A catalyst-free, waste-less ethanol-based solvothermal synthesis of amides

Dalu, Francesca,Scorciapino, Mariano A.,Cara, Claudio,Luridiana, Alberto,Musinu, Anna,Casu, Mariano,Secci, Francesco,Cannas, Carla

supporting information, p. 375 - 381 (2018/02/07)

A green, one-pot approach based on the solvothermal amidation of carboxylic acids with amines has been developed for the synthesis of diverse aliphatic and aromatic amides. It does not require the use of catalysts or coupling reagents and it occurs in the presence of ethanol that has been proved to have a key role in the process. The proposed strategy is also extendable to biologically active amides and could represent a low-cost and waste-less alternative to the common synthetic pathways.

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