title: [Continuous cultivation of a large number of Plasmodium falciparum gametocytes in carbon dioxide incubator].
abstract: OBJECTIVE
  To establish a method for continuously cultivating a large number of P. falciparum gametocytes in vitro using carbon dioxide incubator.
  
  
  METHODS
  The number of gametocytes produced in experimental and control groups was compared after the addition of various concentrations of NaHCO3 to the culture medium.
  
  
  RESULTS
  The gametocytes began to rise on day 5 of cultivation and reached a peak on day 11-13. The peak gametocyte loads were 1.9% +/- 0.6% and 1.3% +/- 0.4% (P < 0.05) in experimental and control group, respectively, indicating that the complete medium with 30 mmol/L sodium bicarbonate was beneficial to gametogenesis. The numbers of stages I-V gametocytes rose to a peak on d5, d7, d11, d13 and d15, respectively. On day 15 the percentage of stage V gametocytes was 7.1%-52.6% with an average of 24.3%. The ratio of macrogametocyte to microgametocyte was 12.8:1. The parasites were able to produce high gametocytaemia up to 24th subculture after thawing. Laboratory reared Anopheles stephensi fed through membrane on blood infected with P. falciparum were dissected, no oocyst was found in the midgut.
  
  
  CONCLUSIONS
  A culture system which could consistently and stably produce a large number of gametocytes of P. falciparum was established.
authors.affiliation: Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai 200025.
authors.forename: X
authors.initials: X
authors.lastname: Xu
authors.forename: Z
authors.initials: Z
authors.lastname: Feng
authors.forename: B
authors.initials: B
authors.lastname: Yang
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: W
authors.initials: W
authors.lastname: Hu
authors.forename: Q
authors.initials: Q
authors.lastname: Ni
mesh_terms: D000818:Animals; D000852:Anopheles / Q000469:parasitology; D002245:Carbon Dioxide; D003470:Culture Media; D004912:Erythrocytes / Q000469:parasitology; D005260:Female; D066298:In Vitro Techniques; D008297:Male; D010963:Plasmodium falciparum / Q000254:growth & development*; D017693:Sodium Bicarbonate
chemical_list: D003470:Culture Media; D002245:Carbon Dioxide; D017693:Sodium Bicarbonate