Piperlongumine Reduces Aortic Calcification in Mice

Piperlongumine, an extract of long peppers, was shown to be senolytic a few years ago. The compound is capable of selectively destroying senescent cells by sensitizing them to oxidative damage, provoking apoptosis. The accumulation of senescent cells is one of the causes of aging, and means of clearance are thus potentially valuable. For those considering introducing more long peppers into their diet, note that a senolytic dose of piperlongumine would require ingesting an impossibly large weight of pepper. Just a few peppers will do absolutely nothing, as they contain far too little piperlongumine individually to make any difference.

Interestingly, this discovery doesn't appear to have made its way all that far into that part of the research community that works with piperlongumine on a regular basis. I keep seeing papers in which scientists report on the evaluation of piperlongumine as a treatment for an age-related condition that is known to be caused in part by cellular senescence, in which there is no mention of senescent cells. It is odd.

Today's open access paper is an example of the type, in which piperlongumine is deployed to treat aortic calcification, a cause of vascular stiffness, hypertension, and consequent cardiovascular disease. There is good evidence for senescent cells to contribute to this process via their secretions, inflammatory signaling that causes cells in blood vessel walls to begin to behave as though they are in bone tissue, depositing calcium into the extracellular matrix. Not that you would learn that from this paper, which focuses instead on the downstream changes that take place in these misbehaving blood vessel cells.

Piperlongumine Attenuates High Calcium/Phosphate-Induced Arterial Calcification by Preserving P53/PTEN Signaling

Vascular calcification is a complex disease that can occur in large and small blood vessels throughout the body. The main feature of vascular calcification is the deposition of calcium-containing complexes along the blood vessel wall. These deposits are mainly composed of calcium and phosphate minerals in the form of hydroxyapatite crystals, which are similar to those in bone tissue. Vascular calcification is now recognized as an active biological process that shares many features with physiological bone formation. There are many causes of vascular calcification, including diabetic angiopathy, chronic kidney disease, lipid metabolism disorders, and genetic factors. Currently, no theory completely explains the pathogenesis of vascular calcification, and no specific treatment methods for vascular calcification are preferred. Therefore, the search for effective treatment methods for vascular calcification is of great significance for the future protection of human cardiovascular health.

Vascular smooth muscle cells (VSMCs) are thought to constitute the main cell type in vascular calcification. In calcified blood vessels, VSMCs show osteogenic differentiation, that is, transformation from a contractile phenotype to a bone/cartilage mineralized phenotype, which is characterized by the development of calcified vesicles, downregulation of mineralization-inhibiting molecules, and increased calcified matrix. This transformation is accompanied by loss of the smooth muscle cell marker smooth muscle 22 alpha (SM22α) and increase in osteochondrocyte markers, including runt-related transcription factor 2 (Runx2), bone morphogenetic protein 2 (Bmp2), osteopontin (OPN), osteocalcin, and alkaline phosphatase (ALP). Overexpression of Bmp2 in vascular smooth muscle cells increases the level of calcification, and Bmp2 expression is increased in the calcified atherosclerotic plaques of blood vessels.

Piperlongumine is a cell-permeable, orally bioavailable natural product isolated from the Piper longum L. plant species. The reported pharmacological activities of PLG include anti-inflammatory, antibacterial, anti-atherosclerotic, antioxidant, antitumour, antiangiogenic and anti-diabetic activities. In this study, we determined the effect of PLG on high calcium- and phosphate-induced vascular calcification, and we further explored its potential molecular mechanisms.

In vitro, PLG inhibited calcium deposition of VSMCs treated with high calcium/phosphate medium. PLG also decreased the expression of osteogenic genes and proteins, including Runx2, Bmp2, and OPN. In a vitamin D-induced aortic calcification mouse model, a 5 mg/kg dose of PLG decreased calcium deposition in the aortic wall as well as Runx2 expression. With regard to the mechanism, we found that the levels of P53 mRNA and protein in both VSMCs and mouse aortic tissues were decreased in the calcification models, and we observed that PLG preserved the levels of P53 and its downstream gene PTEN. Concurrent treatment of VSMCs with P53 ShRNA and PLG blunted the anti-calcific effect of PLG. In conclusion, PLG attenuates high calcium/phosphate-induced vascular calcification by upregulating P53/PTEN signaling in VSMCs.

Comments

Challenge accepted I will eat the peppers. I will eat many peppers.

Posted by: David at March 12th, 2021 6:42 PM

There seem to be a variety of supplements out there right now that have piperlongumine. Does anyone know if these are trustworthy, and in sufficient quantity to be effective?

Posted by: Paul at March 13th, 2021 6:33 AM

@Paul: The senolytic dose of piperlongumine, using the usual equivalent dose estimation from the amounts used in mice, is in the half gram to one gram range. Supplements are usually powdered pepper and thus contain far too little piperlongumine to care about.

This paper contains an extraction protocol for processing long peppers to obtain piperlongumine, and suggests 50g of dried pepper can yield 1.4g of piperlongumine: https://doi.org/10.3892/ijmm.2018.3782

I would think that ingesting 25g to 50g of dried hot pepper (something like 1/4 to 1/2 of a measuring cup when powdered) in one sitting is not a wise plan.

Posted by: Reason at March 13th, 2021 6:50 AM

Hi. I'm wondering whether Piperlongumine can dissolve calcium kidneys' stones or not?
(I have some kidney's stones for nearly 30 years, but the condition is not crucial.)

Posted by: Alek Ales at March 13th, 2021 10:08 AM

@Alek Ales
You have a better bet with a targeted diet. But be warned, the of the stones are disturbed even because they are being dissolved they might start moving and cause an immediate issue. If they are less than the critical size(4 mm? ) Then they can safely albeit painfully pass. If they are larger then you might cause problems... This use the main reason the doctors don't like to fix those of the things aint that broken...

Posted by: Cuberat at March 13th, 2021 5:21 PM

Currently I take Fisetin every 3-4 weeks (3g a day for three days straight). I also daily take 1200mg of C-AKG, NMN (I think around 600 mg), and Oxytocin

Doing wonders.

Posted by: David at March 14th, 2021 8:25 PM

@David: what is C-AKG? What effects have you noticed?

Posted by: Barbara T. at March 15th, 2021 5:49 AM

And yet free range humans who eat normal amounts of fresh hot peppers have reduced mortality. However, this may not be because of piperlongumine.

"Consumption of hot red chili peppers was associated with a 13% reduction in the instantaneous hazard of death. Similar, but statistically nonsignificant trends were seen for deaths from vascular disease, but not from other causes. In this large population-based prospective study, the consumption of hot red chili pepper was associated with reduced mortality. Hot red chili peppers may be a beneficial component of the diet."

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5222470/

Posted by: Lee at March 15th, 2021 7:22 AM

@Reason: Thanks for pointing out the preparation process. It gets VERY technical, and essentially lost me after the second paragraph or so. It seems that they added 500g of the dried fruits to a liter of ethyl acetate for a week, then...I'm not sure. Let the ethyl acetate evaporate leaving 35g of dried residue?

One way or other other, they get 35g of dried residue then add it to 500 ml of water...and after that I simply cannot follow what they are doing. They seem to be separating the parts out further and then testing for purity, but I doubt that I could do these things. I'll study harder.

Anyway, could be there is some profit and use to be had by selling the dried fruits or by processing them down to actual piper longumine, but therein lies the usual legal and business thicket. It would be nice if someone would just do this for us :)

I'll study the matter harder.

Posted by: PAUL at March 16th, 2021 1:02 AM
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