Target type: biologicalprocess
Any process that activates or increases the frequency, rate or extent of myoblast proliferation. [GOC:BHF]
Positive regulation of myoblast proliferation is a complex process that involves the coordinated action of multiple signaling pathways and transcription factors. It is essential for the growth and development of skeletal muscle tissue.
**Key Signaling Pathways:**
* **Growth factor signaling:** Myoblasts respond to growth factors such as fibroblast growth factor (FGF), insulin-like growth factor (IGF), and platelet-derived growth factor (PDGF). These factors activate downstream signaling pathways, including the mitogen-activated protein kinase (MAPK) pathway, the phosphoinositide 3-kinase (PI3K)-AKT pathway, and the Ras/MEK/ERK pathway. These pathways promote cell cycle progression and prevent premature differentiation.
* **Wnt signaling:** Wnt signaling plays a crucial role in myoblast proliferation and survival. Activation of the Wnt pathway leads to the stabilization of β-catenin, a key transcription factor that regulates the expression of genes involved in cell cycle control and proliferation.
* **Hedgehog signaling:** The Hedgehog signaling pathway is involved in myoblast proliferation and differentiation. Activation of Hedgehog signaling promotes the expression of genes that regulate cell cycle progression and muscle development.
**Key Transcription Factors:**
* **MyoD:** MyoD is a master regulator of muscle differentiation. It activates the expression of muscle-specific genes and promotes the withdrawal of myoblasts from the cell cycle.
* **Myf5:** Myf5 is another muscle-specific transcription factor that plays a role in myoblast proliferation and survival.
* **Pax7:** Pax7 is a transcription factor that is essential for the maintenance of muscle stem cells (satellite cells). It promotes the proliferation of satellite cells and their differentiation into myoblasts.
**Molecular Mechanisms:**
* **Cell cycle regulation:** Positive regulation of myoblast proliferation involves the activation of cell cycle proteins such as cyclin-dependent kinases (CDKs) and cyclins. These proteins promote the transition from one phase of the cell cycle to the next.
* **Inhibition of differentiation:** Myoblasts must maintain a proliferative state to generate a sufficient pool of cells for muscle growth. This involves inhibiting the expression of differentiation-inducing factors such as MyoD.
* **Survival signaling:** Myoblasts require survival signals to prevent apoptosis (programmed cell death). Survival pathways, such as the PI3K-AKT pathway, promote cell survival by inhibiting apoptotic pathways.
**Conclusion:**
Positive regulation of myoblast proliferation is a tightly regulated process that involves multiple signaling pathways and transcription factors. Understanding this process is crucial for developing strategies to promote muscle growth and repair in conditions such as muscular dystrophy and aging.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Peroxisome proliferator-activated receptor delta | A peroxisome proliferator-activated receptor delta that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q03181] | Homo sapiens (human) |
| Catenin beta-1 | A catenin beta-1 that is encoded in the genome of human. [PRO:WCB, UniProtKB:P35222] | Homo sapiens (human) |
| Potassium voltage-gated channel subfamily A member 5 | A voltage-gated potassium channel subunit KCNA5 that is encoded in the genome of human. [] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| gw 2433 | GW 2433: binds peroxisome proliferator-activated receptor alpha (PPARalpha); structure in first source | ||
| N-(2-aminoethyl)-5-chloro-1-naphthalenesulfonamide | naphthalenes; sulfonic acid derivative | ||
| 5-methoxypsoralen | 5-methoxypsoralen : A 5-methoxyfurocoumarin that is psoralen substituted by a methoxy group at position 5. 5-Methoxypsoralen: A linear furanocoumarin that has phototoxic and anti-inflammatory properties, with effects similar to METHOXSALEN. It is used in PUVA THERAPY for the treatment of PSORIASIS. | 5-methoxyfurocoumarin; organic heterotricyclic compound; psoralens | hepatoprotective agent; plant metabolite |
| clofibric acid | clofibric acid : A monocarboxylic acid that is isobutyric acid substituted at position 2 by a p-chlorophenoxy group. It is a metabolite of the drug clofibrate. Clofibric Acid: An antilipemic agent that is the biologically active metabolite of CLOFIBRATE. | aromatic ether; monocarboxylic acid; monochlorobenzenes | anticholesteremic drug; antilipemic drug; antineoplastic agent; herbicide; marine xenobiotic metabolite; PPARalpha agonist |
| flecainide | flecainide : A monocarboxylic acid amide obtained by formal condensation of the carboxy group of 2,5-bis(2,2,2-trifluoroethoxy)benzoic acid with the primary amino group of piperidin-2-ylmethylamine. An antiarrhythmic agent used (in the form of its acetate salt) to prevent and treat tachyarrhythmia (abnormal fast rhythm of the heart). Flecainide: A potent anti-arrhythmia agent, effective in a wide range of ventricular and atrial ARRHYTHMIAS and TACHYCARDIAS. | aromatic ether; monocarboxylic acid amide; organofluorine compound; piperidines | anti-arrhythmia drug |
| lidocaine | lidocaine : The monocarboxylic acid amide resulting from the formal condensation of N,N-diethylglycine with 2,6-dimethylaniline. Lidocaine: A local anesthetic and cardiac depressant used as an antiarrhythmia agent. Its actions are more intense and its effects more prolonged than those of PROCAINE but its duration of action is shorter than that of BUPIVACAINE or PRILOCAINE. | benzenes; monocarboxylic acid amide; tertiary amino compound | anti-arrhythmia drug; drug allergen; environmental contaminant; local anaesthetic; xenobiotic |
| nifedipine | Nifedipine: A potent vasodilator agent with calcium antagonistic action. It is a useful anti-anginal agent that also lowers blood pressure. | C-nitro compound; dihydropyridine; methyl ester | calcium channel blocker; human metabolite; tocolytic agent; vasodilator agent |
| pirinixic acid | pirinixic acid: structure | aryl sulfide; organochlorine compound; pyrimidines | |
| methyleugenol | methyleugenol: structure | phenylpropanoid | |
| myristic acid | Myristic Acid: A saturated 14-carbon fatty acid occurring in most animal and vegetable fats, particularly butterfat and coconut, palm, and nutmeg oils. It is used to synthesize flavor and as an ingredient in soaps and cosmetics. (From Dorland, 28th ed) tetradecanoate : A long-chain fatty acid anion that is the conjugate base of myristic acid; major species at pH 7.3. tetradecanoic acid : A straight-chain, fourteen-carbon, long-chain saturated fatty acid mostly found in milk fat. | long-chain fatty acid; straight-chain saturated fatty acid | algal metabolite; Daphnia magna metabolite; EC 3.1.1.1 (carboxylesterase) inhibitor; human metabolite |
| bezafibrate | aromatic ether; monocarboxylic acid; monocarboxylic acid amide; monochlorobenzenes | antilipemic drug; environmental contaminant; geroprotector; xenobiotic | |
| sertindole | sertindole : A phenylindole that is 1H-indole which is substituted on the nitrogen by a p-chlorophenyl group, at position 5 by chlorine, and at position 3 by a piperidin-4-yl group, which is itself substituted on the nitrogen by a 2-(2-oxoimidazolidin-1-yl)ethyl group. | heteroarylpiperidine; imidazolidinone; organochlorine compound; organofluorine compound; phenylindole | alpha-adrenergic antagonist; H1-receptor antagonist; second generation antipsychotic; serotonergic antagonist |
| fenofibric acid | fenofibric acid : A monocarboxylic acid that is 2-methylpropanoic acid substituted by a 4-(4-chlorobenzoyl)phenoxy group at position 2. It is a metabolite of the drug fenofibrate. fenofibric acid: RN given refers to parent cpd without isomeric designation; structure | aromatic ketone; chlorobenzophenone; monocarboxylic acid | drug metabolite; marine xenobiotic metabolite |
| salvin | salvin: a biocyclic diterpenoid; from sage and rosemary (Lamiaceae) | abietane diterpenoid; carbotricyclic compound; catechols; monocarboxylic acid | angiogenesis modulating agent; anti-inflammatory agent; antineoplastic agent; antioxidant; apoptosis inducer; food preservative; HIV protease inhibitor; plant metabolite |
| telmisartan | telmisartan : A member of the class of benzimidazoles used widely in the treatment of hypertension. Telmisartan: A biphenyl compound and benzimidazole derivative that acts as an angiotensin II type 1 receptor antagonist. It is used in the management of HYPERTENSION. | benzimidazoles; biphenyls; carboxybiphenyl | angiotensin receptor antagonist; antihypertensive agent; EC 3.4.15.1 (peptidyl-dipeptidase A) inhibitor; environmental contaminant; xenobiotic |
| toxoflavin | toxoflavin : A pyrimidotriazine that is 1,6-dimethyl-1,5,6,7-tetrahydropyrimido[5,4-e][1,2,4]triazine with oxo groups at positions 5 and 7. toxoflavin: azapteridine antibiotic; structure | carbonyl compound; pyrimidotriazine | antibacterial agent; antineoplastic agent; apoptosis inducer; bacterial metabolite; toxin; virulence factor; Wnt signalling inhibitor |
| 4'-methoxyflavone | 4'-methoxyflavone: from seeds of Psoralea corylifolia (Fabaceae); structure in first source | ether; flavonoids | |
| rosiglitazone | aminopyridine; thiazolidinediones | EC 6.2.1.3 (long-chain-fatty-acid--CoA ligase) inhibitor; ferroptosis inhibitor; insulin-sensitizing drug | |
| 2-bromopalmitate | 2-bromohexadecanoic acid : A bromo fatty acid that is hexadecanoic (palmitic) acid carrying a single bromo substituent at position 2. 2-bromopalmitate: inhibitor of fatty acid oxidation; RN given refers to parent cpd | 2-bromocarboxylic acid; bromo fatty acid; long-chain fatty acid; straight-chain fatty acid | fatty acid oxidation inhibitor |
| mk 767 | 5-((2,4-dioxo-5-thiazolidinyl)methyl)-2-methoxy-N-((4-(trifluoromethyl)phenyl)methyl)benzamide: an antihyperlipidemic agent that also functions as an insulin sensitizer, PPARalpha agonist, and PPARgamma agonist; structure in first source | ||
| anacardic acid | anacardic acid : A hydroxybenzoic acid that is salicylic acid substituted by a pentadecyl group at position 6. It is a major component of cashew nut shell liquid and exhibits an extensive range of bioactivities. anacardic acid: isolated from Anacardium occidentale; monophenol monooxygenase inhibitor | hydroxy monocarboxylic acid; hydroxybenzoic acid | anti-inflammatory agent; antibacterial agent; anticoronaviral agent; apoptosis inducer; EC 2.3.1.48 (histone acetyltransferase) inhibitor; EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor; neuroprotective agent; plant metabolite |
| farglitazar | farglitazar: a non-thiazolidinedione insulin sensitiser and PPARgamma agonist | ||
| senicapoc | senicapoc: a Gardos channel blocker; structure in first source | ||
| cercosporin | cercosporin : An organic heterohexacyclic compound that is perylo[1,12-def][1,3]dioxepine-6,11-dione substituted by hydroxy groups at positions 5 and 12, by methoxy groups at positions 7 and 10, and by 2-hydroxypropyl groups at positions 8 and 9 (the R,R-stereoisomer). It is a phytotoxin which was first isolated from the pathogenic soybean fungus, Cercospora kikuchii and later found in multiple members of the genus Cercospora. cercosporin: phyytotoxin from Cercospora beticola Sacc; posses photodynamic action on mice, bacteria & plants | ||
| quinidine | quinidine : A cinchona alkaloid consisting of cinchonine with the hydrogen at the 6-position of the quinoline ring substituted by methoxy. Quinidine: An optical isomer of quinine, extracted from the bark of the CHINCHONA tree and similar plant species. This alkaloid dampens the excitability of cardiac and skeletal muscles by blocking sodium and potassium currents across cellular membranes. It prolongs cellular ACTION POTENTIALS, and decreases automaticity. Quinidine also blocks muscarinic and alpha-adrenergic neurotransmission. | cinchona alkaloid | alpha-adrenergic antagonist; anti-arrhythmia drug; antimalarial; drug allergen; EC 1.14.13.181 (13-deoxydaunorubicin hydroxylase) inhibitor; EC 3.6.3.44 (xenobiotic-transporting ATPase) inhibitor; muscarinic antagonist; P450 inhibitor; potassium channel blocker; sodium channel blocker |
| syringaresinol | (+)-syringaresinol : The (7alpha,7'alpha,8alpha,8'alpha)-stereoisomer of syringaresinol. | syringaresinol | antineoplastic agent |
| oleic acid | oleic acid : An octadec-9-enoic acid in which the double bond at C-9 has Z (cis) stereochemistry. Oleic Acid: An unsaturated fatty acid that is the most widely distributed and abundant fatty acid in nature. It is used commercially in the preparation of oleates and lotions, and as a pharmaceutical solvent. (Stedman, 26th ed) | octadec-9-enoic acid | antioxidant; Daphnia galeata metabolite; EC 3.1.1.1 (carboxylesterase) inhibitor; Escherichia coli metabolite; mouse metabolite; plant metabolite; solvent |
| LSM-42773 | aromatic ketone | ||
| epipinoresinol | epipinoresinol : An enantiomer of pinoresinol having (+)-(1R,3aR,4S,6aR)-configuration. | pinoresinol | marine metabolite; plant metabolite |
| (2'-(benzyloxycarbonylaminomethyl)biphenyl-2-carboxylic acid 2-(2-pyridyl)ethylamide) | biphenyls | ||
| etodolac, (-)-isomer | (R)-etodolac : The R-enantiomer of etodolac. It is inactive, in contrast to the enantiomer, (S)-etodolac, which is a preferential inhibitor of cyclo-oxygenase 2 and a non-steroidal anti-inflammatory. The racemate is commonly used for the treatment of rheumatoid arthritis and osteoarthritis, and for the alleviation of postoperative pain. | etodolac | |
| t 0070907 | T 0070907: a PPARgamma antagonist; structure in first source | carbonyl compound; organohalogen compound | |
| gsk 3787 | |||
| 2-chloro-n(6)-(3-iodobenzyl)adenosine-5'-n-methyluronamide | 2-chloro-N(6)-(3-iodobenzyl)adenosine-5'-N-methyluronamide: structure given in first source | ||
| gw 7647 | GW 7647 : A monocarboxylic acid that is 2-(phenylsulfanyl)isobutyric acid in which the phenyl group is substituted at the para- position by a 3-aza-7-cyclohexylhept-1-yl group in which the nitrogen is acylated by a (cyclohexylamino)carbonyl group. GW 7647: a PPAR-alpha agonist; structure in first source | aryl sulfide; monocarboxylic acid; ureas | PPARalpha agonist |
| acacetin | 5,7-dihydroxy-4'-methoxyflavone : A monomethoxyflavone that is the 4'-methyl ether derivative of apigenin. | dihydroxyflavone; monomethoxyflavone | anticonvulsant; plant metabolite |
| psi-baptigenin | pseudobaptigenin : A member of the class of 7-hydroxyisoflavones that is 7-hydroxyisoflavone and in which the phenyl group at position 3 is replaced by a 1,3-benzodioxol-5-yl group. | 7-hydroxyisoflavones; benzodioxoles | antiprotozoal drug; plant metabolite |
| n-oleoylethanolamine | N-oleoylethanolamine: ceramidase inhibitor oleoyl ethanolamide : An N-(long-chain-acyl)ethanolamine that is the ethanolamide of oleic acid. The monounsaturated analogue of the endocannabinoid anandamide. | endocannabinoid; N-(long-chain-acyl)ethanolamine; N-acylethanolamine 18:1 | EC 3.5.1.23 (ceramidase) inhibitor; geroprotector; PPARalpha agonist |
| clathrodin | clathrodin: structure given in first source; isolated from marine sponges of the genus Agelas | ||
| oroidin | oroidin: from marine sponges of the genus Agelas; structure in first source | pyrroles; secondary carboxamide | metabolite |
| hymenidin | hymenidin: serotonergic receptor antagonist from Okinawan marine sponge Hymeniacidon; structure given in first source | ||
| pregna-4,17-diene-3,16-dione | pregna-4,17-diene-3,16-dione: steroid from guggulu extract; RN & N1 from C1 Form index; RN given refers to cpd without isomeric designation; structure in first source; antagonist of farnesoid X receptor | 3-hydroxy steroid | androgen |
| gw 1929 | GW 1929: activates peroxisome proliferator-activated receptor-gamma; structure in first source | benzophenones | |
| l-165041 | 4-(3-(2-propyl-3-hydroxy-4-acetyl)phenoxy)propyloxyphenoxy acetic acid: a PPAR-delta agonist has regulatory effects on a variety of adipokines, and these effects might explain some of their metabolic function. | aromatic ketone | |
| gw 501516 | GW 501516 : An aromatic ether that is phenoxyacetic acid in which the phenyl group is substituted at position 2 by a methyl group and at position 4 by a (1,3-thiazol-5-ylmethyl)sulfanediyl group, and in which the 1,3-thiazolyl group is substituted at positions 2 and 4 by p-trifluoromethylphenyl and methyl groups, respectively. GW 501516: a selective PPARdelta agonist; structure in first source | 1,3-thiazoles; aromatic ether; aryl sulfide; monocarboxylic acid; organofluorine compound | carcinogenic agent; PPARbeta/delta agonist |
| tzd 18 | |||
| a 1899 | A 1899: a TASK-1 potassium channel blocker; structure in first source | ||
| gft505 | |||
| gw 9578 | GW 9578: a peroxisome proliferator-activated receptor alpha agonist; structure in first source | ||
| gw 7845 | GW 7845: ligand of the peroxisome proliferator-activated receptor-gamma; structure in first source | ||
| naveglitazar | naveglitazar: LY-519818 is the (alpha-S)-isomer; an antidiabetic agent; structure in first source | aromatic ether | |
| l 796449 | L 796449: a peroxisomal proliferator-activated receptor-gamma agonist; structure in first source | ||
| gw0742 | GW 610742: structure in first source | monocarboxylic acid | |
| 3-chloro-4-(3-(7-propyl-3-trifluoromethyl-6-benzisoxazolyl)propylthio)phenylacetic acid | |||
| ns-220 | |||
| gw 590735 | 2-methyl-2-(4-(((4-methyl-2-(4-trifluoromethylphenyl)-thiazol-5-ylcarbonyl)amino)methyl)phenoxy)propionic acid: an HDLc raising agent; structure in first source | ||
| aleglitazar | aleglitazar: a dual peroxisome PPAR-alpha and PPAR-gamma agonist for type 2 diabetes | ||
| ucn 1028 c | calphostin C: structure given in first source; isolated from Cladosporium cladosporioides | ||
| mbx-8025 | seladelpar: PPAR-delta agonist | ||
| gw9508 | GW9508: structure in first source | aromatic amine | |
| lj 529 | |||
| bms 687453 | |||
| amorfrutin a | amorfrutin A: an antidiabetic agent that inhibits NF-kappaB activation; structure in first source | stilbenoid | |
| [[(1S,2S,5R)-5-methyl-2-propan-2-ylcyclohexyl]-phenylphosphoryl]benzene | monoterpenoid | ||
| amorfrutin b | amorfrutin B: structure in first source | ||
| gsk0660 | GSK0660: PPAR antagonist; structure in first source | sulfonamide | |
| ly 518674 | LY 518674: a peroxisome proliferator-activated receptor alpha agonist; structure in first source |