1. Neuronal Signaling
  2. Amyloid-β
  3. β-Amyloid (1-40)

β-Amyloid (1-40) is a primary protein in plaques found in the brains of patients with Alzheimer's disease.

For research use only. We do not sell to patients.

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β-Amyloid (1-40) Chemical Structure

β-Amyloid (1-40) Chemical Structure

CAS No. : 131438-79-4

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Description

β-Amyloid (1-40) is a primary protein in plaques found in the brains of patients with Alzheimer's disease.

In Vitro

β-Amyloid (1-40) and (1-42) are major components of senile plaque amyloids, are physiological peptides present in the brain, cerebrospinal fluid (CSF) and plasma. The levels of CSF β-Amyloid (1-40) and (1-42) show a U-shaped natural course in normal aging[1].Chronic infusion of beta-amyloid (1-40) for 14 days into the rat cerebroventricle decreased the activity of soluble protein kinase C (PKC) in the hippocampus. Subcellular translocation of PKC to membrane fraction in hippocampal slices of rats treated with beta-amyloid (1-40) is completely abolished under acute stimulation with 0.5 microM phorbol-dibutyrate (PDBu)[2].
The further aggregation of β-Amyloid (1-40)
1. Solid Aβ peptide was dissolved in cold hexafluoro-2-propanol (HFIP). The peptide was incubated at room temperature for at least 1h to establish monomerization and randomization of structure.
2. The HFIP was removed by evaporation, and the resulting peptide was stored as a film at -20 or -80°C.
3. The resulting film was dissolved in anhydrous DMSO at 5 mM and then diluted into the appropriate concentration and buffer (serum- and phenol red-free culture medium) with vortexing.
4. Next, the solution was age 48h at 4-8°C. The sample was then centrifuged at 14000g for 10 min at 4-8°C; the soluble oligomers were in the supernatant. The supernatant was diluted 10-200-fold for experiments.
Methods vary depends on the downstream applications.

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

In Vivo

Chronic infusion of β-Amyloid (1-40) into rat cerebroventricle leads to deficit in spatial and non-spatial memory formation[2]. Chronic treatment of β-Amyloid (1-40) does not change lever-pressing performance significantly, but performance declined significantly 30 days after termination of the chronic daily regimen. The soluble unaggregated form of β-Amyloid (1-40), injected into the dorsal hippocampus, does not appear to have behavioral effects on performance or short-term working memory in rats, but multiple repeat injections produced performance decrements several weeks later. Repeated injection of β-Amyloid (1-40) through indwelling cannulae shows promise for development of an animal model of Alzheimer's disease[3].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Molecular Weight

4329.82

Formula

C194H295N53O58S

CAS No.
Appearance

Solid

Color

White to off-white

Sequence

Asp-Ala-Glu-Phe-Arg-His-Asp-Ser-Gly-Tyr-Glu-Val-His-His-Gln-Lys-Leu-Val-Phe-Phe-Ala-Glu-Asp-Val-Gly-Ser-Asn-Lys-Gly-Ala-Ile-Ile-Gly-Leu-Met-Val-Gly-Gly-Val-Val

Sequence Shortening

DAEFRHDSGYEVHHQKLVFFAEDVGSNKGAIIGLMVGGVV

Structure Classification
Initial Source
Shipping

Room temperature in continental US; may vary elsewhere.

Storage

Sealed storage, away from moisture

Powder -80°C 2 years
-20°C 1 year

*The compound is unstable in solutions, freshly prepared is recommended.

Solvent & Solubility
In Vitro: 

H2O : 100 mg/mL (23.10 mM; Need ultrasonic)

DMSO : 100 mg/mL (23.10 mM; Need ultrasonic; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)

Preparing
Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 0.2310 mL 1.1548 mL 2.3096 mL
5 mM 0.0462 mL 0.2310 mL 0.4619 mL
View the Complete Stock Solution Preparation Table

* Please refer to the solubility information to select the appropriate solvent. The compound is unstable in solutions, freshly prepared is recommended.

* Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.

  • Molarity Calculator

  • Dilution Calculator

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

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Concentration (start) × Volume (start) = Concentration (final) × Volume (final)

This equation is commonly abbreviated as: C1V1 = C2V2

Concentration (start)

C1

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C2

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In Vivo Dissolution Calculator
Please enter the basic information of animal experiments:

Dosage

mg/kg

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g

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(per animal)

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Number of animals

Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.
Calculation results:
Working solution concentration: mg/mL
This product has good water solubility, please refer to the measured solubility data in water/PBS/Saline for details.
The concentration of the stock solution you require exceeds the measured solubility. The following solution is for reference only.If necessary, please contact MedChemExpress (MCE).
Purity & Documentation
References
Animal Administration
[3]

Rats: HPLC buffer insures the β-Amyloid (1-40) does not aggregate in solution prior to injection, β-Amyloid (1-40) and vehicle are bilaterally infused into the hippocampus, 20 min before experimental sessions, in volumes of 1, 2 and 3 μL per side, at a rate of <1 μL/min. Different volumes of the 1 μM solution are used. Volumes (doses) are given in random order and at least three sham-injection sessions are interposed between β-Amyloid (1-40) or vehicle injections. All rats receive all doses of β-Amyloid (1-40) under the acute injection regimen[3].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

References

Complete Stock Solution Preparation Table

* Please refer to the solubility information to select the appropriate solvent. The compound is unstable in solutions, freshly prepared is recommended.

Optional Solvent Concentration Solvent Mass 1 mg 5 mg 10 mg 25 mg
H2O / DMSO 1 mM 0.2310 mL 1.1548 mL 2.3096 mL 5.7739 mL
5 mM 0.0462 mL 0.2310 mL 0.4619 mL 1.1548 mL
10 mM 0.0231 mL 0.1155 mL 0.2310 mL 0.5774 mL
15 mM 0.0154 mL 0.0770 mL 0.1540 mL 0.3849 mL
20 mM 0.0115 mL 0.0577 mL 0.1155 mL 0.2887 mL

* Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.

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β-Amyloid (1-40) Related Classifications

Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

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β-Amyloid (1-40)
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