Skip to content
Login Register

#hormone production

2 public questions tagged with this topic.

sex determination-ll

AMH is produced by:

Anti-Müllerian Hormone in fetal testes originates from Sertoli cells forming testis cords. After Sry upregulates Sox9 in pre-Sertoli cells, Sox9 together with Sf1/Nr5a1, Wt1 and Gata4 binds Amh promoter activating transcription shortly before testosterone synthesis. Secreted dimeric glycoprotein acts locally on Müllerian duct mesenchyme inducing regression and preventing uterus development. Sertoli cells also establish blood-testis barrier and nurture germ cells. Leydig cells produce testosterone, theca cells produce androgens, granulosa cells produce low AMH postnatally for follicle regulation, distinct from embryonic Sertoli-derived surge driving duct regression.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 17: Sertoli cells secrete AMH to regress Müllerian ducts.

View Details
Gene Therapy

Somatostatin is produced as:

Somatostatin tetradecapeptide 14 aa sequence Ala Gly Cys Lys Asn Phe Phe Trp Lys Thr Phe Thr Ser Cys cyclized via disulfide cysteines 3 and 14 functions potent inhibitor growth hormone insulin glucagon secretion, making direct bacterial expression challenging small bioactive peptide inserts membrane disrupts host metabolism undergoes rapid proteolysis cytoplasmic peptidases OmpT. To overcome instability Itakura 1977 expressed synthetic DNA encoding somatostatin fused downstream E. coli beta-galactosidase fragment 590 residues or tryptophan operon leader peptide trpE 190 residues under trp promoter regulated tryptophan repression generating larger chimera lacking hormonal activity sequestered insoluble inclusion bodies resistant proteolytic attack. Fusion design included methionine codon immediately preceding somatostatin enabling specific chemical cleavage CNBr releasing free tetradecapeptide after protection internal methionines absent. Following cleavage peptide extracted 50 percent acetic acid purified ion exchange CM cellulose reversed-phase HPLC oxidized ferricyanide forming disulfide loop essential binding somatostatin receptors SSTR2 SSTR5. Pioneering fusion approach established general paradigm manufacturing small peptides neurohormones industrially influencing insulin opioid peptides.

Ref: Itakura et al Science 1977 Somatostatin Fusion Production Landmark; NCBI First Recombinant Peptide Manufacturing Review; Lodish Fusion Protein Expression Chap 9.

View Details