Biomaterial Database

Acute hypoxia increases cytosolic calcium in fetal pulmonary artery smooth muscle cells. 1993

D N Cornfield, and T Stevens, and I F McMurtry, and S H Abman, and D M Rodman

Department of Pediatrics, Children's Hospital, Denver Colorado.

We studied the effect of acute hypoxia on the cytosolic calcium concentration ([Ca2+]i) of fetal vascular smooth muscle cells (SMC) from late gestation fetal lambs. We tested the following hypotheses: 1) fetal pulmonary artery (PA) SMC sense hypoxia; 2) hypoxia stimulates transmembrane Ca2+ influx causing increased basal [Ca2+]i and Ca2+ responses to pharmacological vasoconstrictors; and 3) the response is unique to SMC from small (near resistance) PA. Fetal SMC were isolated from the proximal and distal pulmonary (DPA) and carotid arteries of late-gestation ovine fetuses, maintained in culture for 5-14 days prior to study, and studied with dual-excitation microfluorimetry using fura 2. Acute hypoxia caused a 233% increase in [Ca2+]i in distal PA SMC (P < 0.01), which was absent in low extracellular calcium bath. [Ca2+]i increased transiently in normoxic DPA SMC treated with angiotensin II, and oscillations in [Ca2+]i occurred (amplitude > or = 30 nM). In hypoxic DPA SMC the increase in [Ca2+]i was sustained and oscillations were attenuated or absent. [Ca2+]i in proximal PA SMC did not change with exposure to acute hypoxia and carotid artery SMC [Ca2+]i decreased by 13% (P < 0.05). We conclude that fetal SMC isolated from the DPA of late-gestation ovine fetuses directly sense decreased oxygen tension with an increase in [Ca2+]i that is dependent on the entry of extracellular Ca2+.

UI	MeSH Term	Description	Entries
D009131	Muscle, Smooth, Vascular	The nonstriated involuntary muscle tissue of blood vessels.	Vascular Smooth Muscle,Muscle, Vascular Smooth,Muscles, Vascular Smooth,Smooth Muscle, Vascular,Smooth Muscles, Vascular,Vascular Smooth Muscles
D011651	Pulmonary Artery	The short wide vessel arising from the conus arteriosus of the right ventricle and conveying unaerated blood to the lungs.	Arteries, Pulmonary,Artery, Pulmonary,Pulmonary Arteries
D002118	Calcium	A basic element found in nearly all tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes.	Coagulation Factor IV,Factor IV,Blood Coagulation Factor IV,Calcium-40,Calcium 40,Factor IV, Coagulation
D002339	Carotid Arteries	Either of the two principal arteries on both sides of the neck that supply blood to the head and neck; each divides into two branches, the internal carotid artery and the external carotid artery.	Arteries, Carotid,Artery, Carotid,Carotid Artery
D002478	Cells, Cultured	Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.	Cultured Cells,Cell, Cultured,Cultured Cell
D003600	Cytosol	Intracellular fluid from the cytoplasm after removal of ORGANELLES and other insoluble cytoplasmic components.	Cytosols
D005333	Fetus	The unborn young of a viviparous mammal, in the postembryonic period, after the major structures have been outlined. In humans, the unborn young from the end of the eighth week after CONCEPTION until BIRTH, as distinguished from the earlier EMBRYO, MAMMALIAN.	Fetal Structures,Fetal Tissue,Fetuses,Mummified Fetus,Retained Fetus,Fetal Structure,Fetal Tissues,Fetus, Mummified,Fetus, Retained,Structure, Fetal,Structures, Fetal,Tissue, Fetal,Tissues, Fetal
D000208	Acute Disease	Disease having a short and relatively severe course.	Acute Diseases,Disease, Acute,Diseases, Acute
D000804	Angiotensin II	An octapeptide that is a potent but labile vasoconstrictor. It is produced from angiotensin I after the removal of two amino acids at the C-terminal by ANGIOTENSIN CONVERTING ENZYME. The amino acid in position 5 varies in different species. To block VASOCONSTRICTION and HYPERTENSION effect of angiotensin II, patients are often treated with ACE INHIBITORS or with ANGIOTENSIN II TYPE 1 RECEPTOR BLOCKERS.	Angiotensin II, Ile(5)-,Angiotensin II, Val(5)-,5-L-Isoleucine Angiotensin II,ANG-(1-8)Octapeptide,Angiotensin II, Isoleucine(5)-,Angiotensin II, Valine(5)-,Angiotensin-(1-8) Octapeptide,Isoleucine(5)-Angiotensin,Isoleucyl(5)-Angiotensin II,Valyl(5)-Angiotensin II,5 L Isoleucine Angiotensin II,Angiotensin II, 5-L-Isoleucine
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia

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