title: Strong inverse correlation between serum TPO level and platelet count in essential thrombocythemia.
abstract: Serum thrombopoietin (TPO) levels in 50 essential thrombocythemia (ET) patients were measured using a highly sensitive sandwich ELISA. In nine cases, TPO levels were measured at two points with different platelet counts. ET patients showed significantly higher serum TPO levels (n = 59, 2.70 +/- 2.74 fmol/mL, P < 0.0001) than those of normal individuals (n = 29, 0.83 +/- 0.36 fmol/mL). Twenty-three previously untreated ET patients also showed significantly higher serum TPO levels (1.33 +/- 0.75 fmol/mL, P = 0.0066) than normal individuals. Extremely high serum TPO levels (5.46 +/- 3.68 fmol/mL) were observed in ET patients with normal platelet counts. Furthermore, a strong inverse correlation was found between serum TPO levels and platelet counts in ET patients (R = -0.729, P < 0. 0001). This inverse correlation also held for each of nine cases with two-point TPO measurements. In the clinical course of ET, megakaryocyte mass may parallel the platelet mass before and after chemotherapy. Although it is unknown whether overproduction of TPO exists or not in ET, total platelet and megakaryocyte mass, i.e., the total number of c-Mpl, may play a role to regulate serum TPO levels.
authors.affiliation: First Department of Internal Medicine, Urafune Hospital, Yokohama, Kanagawa, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Tomita
authors.forename: S
authors.initials: S
authors.lastname: Motomura
authors.forename: R
authors.initials: R
authors.lastname: Sakai
authors.forename: K
authors.initials: K
authors.lastname: Fujimaki
authors.forename: J
authors.initials: J
authors.lastname: Tanabe
authors.forename: H
authors.initials: H
authors.lastname: Fukawa
authors.forename: H
authors.initials: H
authors.lastname: Harano
authors.forename: H
authors.initials: H
authors.lastname: Kanamori
authors.forename: K
authors.initials: K
authors.lastname: Ogawa
authors.forename: H
authors.initials: H
authors.lastname: Mohri
authors.forename: A
authors.initials: A
authors.lastname: Maruta
authors.forename: F
authors.initials: F
authors.lastname: Kodama
authors.forename: Y
authors.initials: Y
authors.lastname: Ishigatsubo
authors.forename: T
authors.initials: T
authors.lastname: Tahara
authors.forename: T
authors.initials: T
authors.lastname: Kato
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010976:Platelet Count; D013920:Thrombocythemia, Essential / Q000097:blood*; D013926:Thrombopoietin / Q000097:blood*
chemical_list: D013926:Thrombopoietin