| In vitro: |
| Free Radic Res. 2003 Aug;37(8):829-33. | | Antioxidative properties of Martynoside: pulse radiolysis and laser photolysis study.[Pubmed: 14567442] |
METHODS AND RESULTS:
Free radical reactions of Martynoside (MAR), a phenylpropanoid glycoside, with a variety of oxidants were studied in the aqueous solution by laser photolysis and pulse radiolysis techniques. The pKa value of Martynoside in aqueous solution was measured from the pH dependent changes of the UV absorption at 384 nm with value of pKa = 9.2. The phenoxyl radical of Martynoside which exhibits maximum absorption at 360 nm was generated by one-electron transfer to N3* or Br2*-. Other important properties of phenoxyl radical such as extinction coefficient, formation and decay rate constants were also determined.
CONCLUSIONS:
The reaction rate constant of O2*- with Martynoside , k = 8.5 x 10(4) dm3 x mol(-1) x s(-1), was measured by the method of competition kinetics. By measuring time-resolved luminescence emission at 1270 nm, the quenching rate constant of singlet oxygen by MAR was obtained to be 3.3 x 10(6) dm3 x mol(-1) x s(-1). Reduction potential of the Martynoside couple (MAR*/MAR), determined using rutin as reference compound, gave a value E = 0.66 V vs. NHE. The antioxidative properties of Martynoside were compared with those of some well-known antioxidants. | | Phytother Res. 1999 Nov;13(7):621-3. | | Retardation of skeletal muscle fatigue by the two phenylpropanoid glycosides: verbascoside and martynoside from Pedicularis plicata maxim.[Pubmed: 10548760] |
METHODS AND RESULTS:
The effects of the phenylpropanoid glycosides verbascoside and Martynoside from Pedicularis plicata were investigated on muscle contractility in Bufo gastrocnemius muscle electrically stimulated in vitro. The maximum amplitude and maintained time of contraction were mechanically recorded and used as indices of muscle contractility. After 30 min pretreatment of the muscle, verbascoside at 20.0 microM resisted muscle fatigue significantly while Martynoside at 80.0 microM improved muscle contractility only slightly.
CONCLUSIONS:
These two glycosides resisted muscle fatigue depending on their antioxidative activities, which is in agreement with the role of reactive oxygen species (ROS) in promoting fatigue in skeletal muscle. |
|
| In vivo: |
| Int J Sports Med. 2010 Aug;31(8):537-41. | | Anti-sports anaemia effects of verbascoside and martynoside in mice.[Pubmed: 20556696 ] | This paper aims to investigate the effects of verbascoside and Martynoside isolated from PEDICULARIS DOLICHOCYMBA on sports anaemia.
METHODS AND RESULTS:
Forty mice were divided into four groups: Group R (control group, nonsupplemented and maintained at rest), Group E (nonsupplemented and undergoing exercise), Group VE (supplemented with verbascoside 10 mg/kg per day and undergoing exercise), and Group ME (supplemented with Martynoside 10 mg/kg per day and undergoing exercise). After 5 weeks intensive swimming exercises, we measured the RBC count, the hemoglobin concentration, the hematocrit (Hct), the mean corpuscular hemoglobin concentration (MCHC) and the mean corpuscular hemoglobin (MCH). We studied the shapes of RBC and measured the plasma malonyldialdehyde (MDA). We found Group E showed lower RBC, hemoglobin and Hct levels, higher MCHC, MCH, plasma MDA levels and the abnormally shaped RBCs percentage than Groups R, VE and ME. Group ME showed lower RBC and Hct levels, higher MCH, plasma MDA levels and the abnormally shaped RBCs percentage than Group VE.
CONCLUSIONS:
The results indicated that verbascoside and Martynoside have the potential of antagonizing sports anaemia, the mechanism of this effect might be related to preventing RBC from free radical damage. Moreover, verbascoside was found to be more active than Martynoside. | | Biomed Pharmacother . 2021 Jun;138:111501. | | Ex vivo and in vivo chemoprotective activity and potential mechanism of Martynoside against 5-fluorouracil-induced bone marrow cytotoxicity[Pubmed: 33765584] | | Abstract
Martynoside (MAR) is a bioactive glycoside of Rehmannia glutinosa, a traditional Chinese herb frequently prescribed for treating chemotherapy-induced pancytopenia. Despite its clinical usage in China for thousands of years, the mechanism of MAR's hematopoietic activity and its impact on chemotherapy-induced antitumor activity are still unclear. Here, we showed that MAR protected ex vivo bone marrow cells from 5-fluorouracil (5-FU)-induced cell death and inflammation response by down-regulating the TNF signaling pathway, in which II1b was the most regulatory gene. Besides, using mouse models with melanoma and colon cancer, we further demonstrated that MAR had protective effects against 5-FU-induced myelosuppression in mice without compromising its antitumor activity. Our results showed that MAR increased the number of bone marrow nucleated cells (BMNCs) and the percentage of leukocyte and granulocytic populations in 5-FU-induced myelosuppressive mice, accompanied by an increase in numbers of circulating white blood cells and platelets. The transcriptome profile of BMNCs further showed that the mode of action of MAR might be associated with the increased survival of BMNCs and the improvement of the bone marrow microenvironment. In summary, we revealed the potential molecular mechanism of MAR to counteract 5-FU-induced bone marrow cytotoxicity both ex vivo and in vivo, and highlighted its potential clinical usage in cancer patients experiencing chemotherapy-induced multi-lineage myelosuppression.
Keywords: 5-fluorouracil; Bone marrow cytotoxicity; Chemoprotective activity; Martynoside; mRNA-Seq. |
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