The Interrelation of Oxidative and Glycolytic Processes as Sources of Energy for Bull Spermatozoa

Lardy, Henry A.; Phillips, Paul H.

doi:10.1152/ajplegacy.1941.133.3.602

Cited by 112 publications

(21 citation statements)

References 2 publications

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“…The importance of lipids in the endogenous respiration of spermatozoa was first suggested by Lardy & Phillips (1941a, b, 1945 and Lardy, Hansen & Phillips (1945). These workers put forward the suggestion that where glycolysable sugar was unavailable, as in the epididymis or in washed ejaculated spermatozoa freed of seminal plasma, spermatozoa probably rely on intracellular phospholipids for provision of substrate for oxidative energy.…”

Section: Introductionmentioning

confidence: 95%

Metabolism of Fatty Acids by Ovine Spermatozoa

Neill¹,

Masters²

1973

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Summary. The incorporation of 14C-labelled myristic, palmitic, stearic, oleic and linoleic acids in vitro into the lipids of ovine spermatozoa was followed at time intervals from 2 min to 2 hr. Diglycerides readily incorporated fatty acids; 1,2-and 1,3-diglyceride fractions showed preferential specificities for palmitic and myristic acids, respectively, but stearic acid was poorly metabolized by both components.The lower incorporation of acids into total phospholipids reflected the relative metabolic stability of the major phospholipid fractions in ovine spermatozoa, but the minor phospholipids, particularly phosphatidylinositol, showed comparatively high metabolic activity. Compositional analyses showed that myristic acid was the major component of diglycerides, whereas docosahexaenoic acid was the principal fatty acid of the major phospholipid classes. These findings have been compared with previous work on fatty acid metabolism in bovine spermatozoa.

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Section: Introductionmentioning

confidence: 95%

Metabolism of Fatty Acids by Ovine Spermatozoa

Neill¹,

Masters²

1973

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“…In ejaculated bull spermatozoa, the respiration is supposed to have little or no repressive effect on the rate of the Meyerhof Emden cycle (Lardy & Phillips, 1941, 1943Schmidt, Lodge & Salisbury, 1959). However, the experiments which are referred to were performed with the concentrations of substrate which are high compared to the KM values found in the present paper.…”

Section: Effect Of Respirationmentioning

confidence: 99%

The Michaelis-Menten Constant for Fructose and for Glucose of Hexokinase in Bull Spermatozoa

Rikmenspoel¹,

Caputo²

1966

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“…This possibility had not been coilsidered previously. On thr othrr haiid, it might he argued that ahsorbed fructose cannot be the answer to the high endogenous respiratory rate of washed ejaculated spermatozoa 011 the basis of observations that washed spermatozoa soon lose their motility under Nz gas (212). However, these observations may only emphasize the greater efficiency of energy supplied by oxidative metabolism when glycolyzable substrate is in short supply.…”

Section: Endogenous Substratementioning

confidence: 99%