Publications (4) View all
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Article: Wound healing activity of carbon monoxide liberated from CO-releasing molecule (CO-RM).
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ABSTRACT: Wound microenvironment presents widespread oxidant stress, inflammation, and onslaught of apoptosis. Carbon monoxide (CO) exerts pleiotropic cellular effects by modulating intracellular signaling pathways which translate into cellular protection against oxidative stress, inflammation, and apoptosis. CO-releasing molecules (CO-RMs) deliver CO in a controlled manner without altering carboxyhemoglobin levels. This study observed a potential therapeutic value of CO in the wound healing by using tricarbonyldichlororuthenium (II) dimer (CO-releasing molecule (CO-RM)-2), as one of the novel CO-releasing agent. The effect of CO-RM-2 treatment was studied on wound contraction, glucosamine, hydroxyproline levels, and mRNA of cytokines/adhesion molecule in rats using a full-thickness cutaneous wound model and angiogenesis in chick chorioallantoic membrane (CAM) model. CO-RM-2 treatment increased cellular proliferation and collagen synthesis as evidenced by the increase in wound contraction and hydroxyproline and glucosamine contents. The mRNA expression of cytokines endorsed fast healing, as was indicated by the inhibition of pro-inflammatory adhesion molecules such as ICAM-1 and cytokine TNF-α and upregulation of anti-inflammatory cytokine IL-10. An ELISA assay of IL-10 and TNF-α cytokines revealed pro-healing modulation in excision wound by CO-RM-2 treatment. CO-RM significantly promoted the angiogenesis as compared to the iCO-RM group in vitro in CAM model demonstrating pro-angiogenic effects of CO-RM-2 in wound healing process. These results indicate that CO-RM-2 may have a potential application in the management of recalcitrant/obstinate wounds wherein, active wound healing is desired. This study also opens up a new area of research for the synthesis of novel CO-releasing molecules to be used for such purposes.Archiv für Experimentelle Pathologie und Pharmakologie 07/2011; 384(1):93-102. · 2.65 Impact Factor -
Article: Pro-healing potential of hemin: an inducer of heme oxygenase-1.
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ABSTRACT: Hemin induces heme oxygenase (HO), an enzyme which degrades heme in a rate-limiting manner and has an important role in cellular protection against oxidative stress and apoptosis. This HO inducer may be of potential therapeutic value in wound healing and inflammation. To identify the beneficial activity of HO vis a vis wound healing, hemin was used as inducer of HO in rats using a full-thickness cutaneous wound model. Hemin treatment increased cellular proliferation and collagen synthesis as evidenced by increase in wound contraction and hydroxyproline and glucosamine contents. mRNA expression of cytokines endorsed fast healing as was indicated by inhibition of pro-inflammatory cytokines such as ICAM-1 and TNF-alpha and up-regulation of anti-inflammatory cytokine IL-10.European journal of pharmacology 10/2010; 645(1-3):165-70. · 2.59 Impact Factor -
Article: Atorvastatin prevents vascular hyporeactivity to norepinephrine in sepsis: role of nitric oxide and α₁-adrenoceptor mRNA expression.
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ABSTRACT: Hyporeactivity to vasoconstrictors is one of the clinical manifestations of sepsis in man and experimental animals. The objective of the investigation was to examine whether atorvastatin can prevent hyporeactivity to norepinephrine (NE) in mouse aorta in sepsis, and if so, what are the mechanisms involved. Sepsis in mice was induced by cecal ligation and puncture. The aorta was harvested for tension experiment, nitric oxide (NO) and cyclic guanosine monophosphate measurements, and inducible NO synthase (iNOS) and α(1D)-adrenoceptor mRNA expression studies. In comparison with sham-operated controls, sepsis significantly decreased the contractile response to NE in the mouse aorta. Pretreatment with atorvastatin of septic animals completely restored NE-induced contractions to levels similar to those of sham-operated controls and significantly increased survival time and mean arterial pressure. Atorvastatin also attenuated iNOS-induced overproduction of NO, as well as iNOS mRNA expression. Accordingly, hyporeactivity to NE was not evident in tissues pretreated with selective iNOS inhibitor 1400W in sepsis. Although basal cyclic guanosine monophosphate accumulation in the aorta was reduced in sepsis, pretreatment of the tissues with soluble guanylyl cyclase inhibitor 1H-(1,2,4)oxadiazolo(4,3-a)quinoxalin-1-one (ODQ) partially restored the reactivity to NE. Interestingly, hyporeactivity to NE in sepsis was associated with a decreased α(1D)-adrenoceptor mRNA expression in the mouse aorta. Atorvastatin pretreatment, however, prevented the decrease in α(1D)-adrenoceptor mRNA expression in septic animals. In conclusion, atorvastatin seems to prevent hyporeactivity to vasoconstrictor NE in the aorta from septic mice through attenuation of overproduction of NO as well as improved α(1D)-adrenoceptor mRNA expression. The findings of the present study may explain the beneficial effects of atorvastatin on improved hemodynamic functions in sepsis.Shock (Augusta, Ga.) 03/2011; 36(1):76-82. · 2.87 Impact Factor -
Article: Wound healing activity of carbon monoxide liberated from CO-releasing molecule (CO-RM).
[show abstract] [hide abstract]
ABSTRACT: Wound microenvironment presents widespread oxidant stress, inflammation, and onslaught of apoptosis. Carbon monoxide (CO) exerts pleiotropic cellular effects by modulating intracellular signaling pathways which translate into cellular protection against oxidative stress, inflammation, and apoptosis. CO-releasing molecules (CO-RMs) deliver CO in a controlled manner without altering carboxyhemoglobin levels. This study observed a potential therapeutic value of CO in the wound healing by using tricarbonyldichlororuthenium (II) dimer (CO-releasing molecule (CO-RM)-2), as one of the novel CO-releasing agent. The effect of CO-RM-2 treatment was studied on wound contraction, glucosamine, hydroxyproline levels, and mRNA of cytokines/adhesion molecule in rats using a full-thickness cutaneous wound model and angiogenesis in chick chorioallantoic membrane (CAM) model. CO-RM-2 treatment increased cellular proliferation and collagen synthesis as evidenced by the increase in wound contraction and hydroxyproline and glucosamine contents. The mRNA expression of cytokines endorsed fast healing, as was indicated by the inhibition of pro-inflammatory adhesion molecules such as ICAM-1 and cytokine TNF-α and upregulation of anti-inflammatory cytokine IL-10. An ELISA assay of IL-10 and TNF-α cytokines revealed pro-healing modulation in excision wound by CO-RM-2 treatment. CO-RM significantly promoted the angiogenesis as compared to the iCO-RM group in vitro in CAM model demonstrating pro-angiogenic effects of CO-RM-2 in wound healing process. These results indicate that CO-RM-2 may have a potential application in the management of recalcitrant/obstinate wounds wherein, active wound healing is desired. This study also opens up a new area of research for the synthesis of novel CO-releasing molecules to be used for such purposes.Archiv für Experimentelle Pathologie und Pharmakologie 07/2011; 384(1):93-102. · 2.65 Impact Factor
