O-Phospho-L-serine

O-Phospho-L-serine
Analytical Code: 140508

phosphorylated form of the amino-acid L-serine; DL-O-Phospho-DL-serine is the racemic mixture. Both carry a phosphate ester that gives them a high affinity for calcium ions and for group-III metabotropic glutamate receptors (mGluR4/6/7/8).

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1. Bone & musculoskeletal health


Mechanism Key findings Model
Bone adhesive & cement modifier Phosphoserine-modified calcium-phosphate cements (PM-CPC) show 3- to 10-fold higher adhesive strength to wet bone than commercial CPCs, while remaining resorbable. mdpi.compmc.ncbi.nlm.nih.gov Rat femur, rabbit tibia, ex-vivo human trabecular cores
Enhanced osteointegration & remodelling Addition of 10-15 wt % P-serine accelerates osteoblast proliferation, increases new-bone volume, and speeds full cement resorption to <12 months. researchgate.net Sheep critical-size defect
Dual “bone + cartilage” fixation A 2024 study combined PM-CPC with a phosphoserine-gelatin hydrogel to glue osteochondral fragments securely in an ex-vivo bovine knee, suggesting a one-step alternative to screws or pins. frontiersin.org
Atomic-level mineral templating X-ray crystallography shows P-serine coordinates Ca²⁺ and PO₄³⁻ in a geometry similar to osteopontin and bone sialoprotein, rationalising its strong affinity for hydroxyapatite. pubs.acs.org

Take-home – By substituting or supplementing conventional bone cements, O-Phospho-L-serine can improve fixation, speed remodelling and potentially reduce hardware–related complications.




2. Neuroprotective & neuromodulatory actions

Mechanism Key findings Model
mGluR4 agonism (pre-synaptic) L-SOP (100 µM) cut glutamate release in rat substantia nigra slices by 33 %, reversed akinesia in a reserpine PD model and protected dopaminergic neurons from 6-OHDA toxicity. pubmed.ncbi.nlm.nih.gov Rodent Parkinson’s models
Oxidative-stress resistance mGluR4 activation by L-SOP reduced JNK/p38 phosphorylation, suppressed caspase-3 cleavage and rescued neural stem cells from H₂O₂-induced death. pmc.ncbi.nlm.nih.gov Murine NSC culture
Excitotoxicity blockade & neurogenesis In mixed cortical cultures, L-SOP lessened NMDA-mediated excitotoxicity and promoted neuronal differentiation via mTOR signalling. jneurosci.orgtocris.com

Implications – The compound is being explored as a lead or probe for Parkinson’s disease, stroke and neuro-repair strategies that hinge on dampening glutamate excitotoxicity while fostering neural regeneration.


3. Mineral-homeostasis signalling (emerging)


  • The calcium-sensing receptor (CaSR) integrates amino-acid and phosphate signals to control parathyroid hormone release. Although direct CaSR studies have focused on L-phenylalanine and phosphate, phosphoserine’s dual “amino-acid + phosphate” nature makes it a plausible endogenous co-agonist, and it is used routinely in structural CaSR assays. elifesciences.org

  • Translational interest: secondary hyperparathyroidism drugs now target CaSR’s amino-acid pocket; phosphoserine analogues are being screened as low-cost calcimimetics.

4. DL-O-Phospho-DL-serine


  • Composition – 50 % L-, 50 % D-enantiomer.

  • Current use – Biochemical standard for kinase/phosphatase assays; adhesive component in experimental cements; tool compound for mGluR4 pharmacology.

  • Health relevance – Because only the L-enantiomer is bioactive at most receptors and in bone mineralisation, the racemate shows about half the potency of pure O-Phospho-L-serine in the above applications. No specific in-vivo benefit unique to the D-form has been reported.

Practical notes & safety


Aspect Comment
Bioavailability Highly polar; oral uptake is unknown. In adhesive/cement uses, it is applied locally and becomes incorporated into mineral.
Dosing Pre-clinical neuro studies inject 0.3–3 µg per substantia nigra or 10–50 mg kg⁻¹ i.p.; bone‐cement work uses 5–20 wt %.
Toxicology No systemic toxicity seen in rat and rabbit bone studies up to 12 months. mdpi.com
Regulatory status Research chemical; not GRAS, not Novel Food; would be regulated as a medical-device additive (for cements) or investigational drug (neurology).


O-Phospho-L-serine

phosphorylated form of the amino-acid L-serine; DL-O-Phospho-DL-serine is the racemic mixture. Both carry a phosphate ester that gives them a high affinity for calcium ions and for group-III metabotropic glutamate receptors (mGluR4/6/7/8).

1. Bone & musculoskeletal health


Mechanism Key findings Model
Bone adhesive & cement modifier Phosphoserine-modified calcium-phosphate cements (PM-CPC) show 3- to 10-fold higher adhesive strength to wet bone than commercial CPCs, while remaining resorbable. mdpi.compmc.ncbi.nlm.nih.gov Rat femur, rabbit tibia, ex-vivo human trabecular cores
Enhanced osteointegration & remodelling Addition of 10-15 wt % P-serine accelerates osteoblast proliferation, increases new-bone volume, and speeds full cement resorption to <12 months. researchgate.net Sheep critical-size defect
Dual “bone + cartilage” fixation A 2024 study combined PM-CPC with a phosphoserine-gelatin hydrogel to glue osteochondral fragments securely in an ex-vivo bovine knee, suggesting a one-step alternative to screws or pins. frontiersin.org
Atomic-level mineral templating X-ray crystallography shows P-serine coordinates Ca²⁺ and PO₄³⁻ in a geometry similar to osteopontin and bone sialoprotein, rationalising its strong affinity for hydroxyapatite. pubs.acs.org

Take-home – By substituting or supplementing conventional bone cements, O-Phospho-L-serine can improve fixation, speed remodelling and potentially reduce hardware–related complications.




2. Neuroprotective & neuromodulatory actions

Mechanism Key findings Model
mGluR4 agonism (pre-synaptic) L-SOP (100 µM) cut glutamate release in rat substantia nigra slices by 33 %, reversed akinesia in a reserpine PD model and protected dopaminergic neurons from 6-OHDA toxicity. pubmed.ncbi.nlm.nih.gov Rodent Parkinson’s models
Oxidative-stress resistance mGluR4 activation by L-SOP reduced JNK/p38 phosphorylation, suppressed caspase-3 cleavage and rescued neural stem cells from H₂O₂-induced death. pmc.ncbi.nlm.nih.gov Murine NSC culture
Excitotoxicity blockade & neurogenesis In mixed cortical cultures, L-SOP lessened NMDA-mediated excitotoxicity and promoted neuronal differentiation via mTOR signalling. jneurosci.orgtocris.com

Implications – The compound is being explored as a lead or probe for Parkinson’s disease, stroke and neuro-repair strategies that hinge on dampening glutamate excitotoxicity while fostering neural regeneration.


3. Mineral-homeostasis signalling (emerging)


4. DL-O-Phospho-DL-serine


Practical notes & safety


Aspect Comment
Bioavailability Highly polar; oral uptake is unknown. In adhesive/cement uses, it is applied locally and becomes incorporated into mineral.
Dosing Pre-clinical neuro studies inject 0.3–3 µg per substantia nigra or 10–50 mg kg⁻¹ i.p.; bone‐cement work uses 5–20 wt %.
Toxicology No systemic toxicity seen in rat and rabbit bone studies up to 12 months. mdpi.com
Regulatory status Research chemical; not GRAS, not Novel Food; would be regulated as a medical-device additive (for cements) or investigational drug (neurology).
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