フィネレノンの薬物動態、組織分布、透過性、タンパク質結合および安定性に関する研究:バリデートされたUPLCおよびLC-MS法を使用
Shivam Rathaur1, Parag Varshney2, Debalina Maity2
1Division of Pharmaceutics and Pharmacokinetics, CSIR-Central Drug Research Institute, Lucknow 226031, Uttar Pradesh, India.
まとめ
本研究では、ラットにおけるフィネレノン(FNR)の薬物動態および組織分布を解析するための生物分析法を開発した。FNRは良好な溶解性、安定性、および高い透過性を示し、糖尿病性腎臓病における臨床使用を支持する。
科学分野:
- 薬理学と毒物学
- 薬物代謝と薬物動態
- 腎臓病学
背景:
- フィネレノン(FNR)は、糖尿病性腎臓病に対する新規の非ステロイド性ミネラルコルチコイド受容体拮抗薬である。
- バリデートされた生物分析法は、生体内におけるFNRの挙動を理解するために不可欠である。
研究 の 目的:
- ラット血漿中のFNRに対する高感度LC-MS/MS生物分析法の開発とバリデーション。
- SDラットにおけるFNRの薬物動態(PK)および組織分布(TD)の決定。
- 溶解性、安定性、透過性、および血漿タンパク質結合を含むFNRのin vitro特性の評価。
主な方法:
- 生物分析のためのタンデム質量分析(LC-MS/MS)と組み合わせた液体クロマトグラフィー。
- 経口および静脈内投与後の生体内PKおよびTD研究。
- in vitro評価:溶解性、シミュレートされた腸液/胃液安定性、血漿安定性、ミクロソーム安定性、血漿タンパク質結合(PPB)、血液-血漿分配、PAMPA、およびin situ SPIP。
主要な成果:
- FNRは胃液(FaSSGF)と比較して腸液(FaSSIF)でより高い溶解性と安定性を示した。
- FNRは良好な血漿安定性(91.98%)およびラット肝ミクロソームでの有意な代謝(90.30%)を示した。
- 高い血漿タンパク質結合率(94.11-96.97%)、迅速な血液-血漿間移行、および高い受動的透過性(PAMPA、SPIP)が観察された。経口絶対バイオアベイラビリティは49.17%であった。
結論:
- 開発されたLC-MS/MS法は、FNRの生物分析に適している。
- FNRは、良好な吸収と分布を含む、好ましい物理化学的および薬物動態学的特性を有する。
- これらの発見は、糖尿病に関連する慢性腎臓病の治療のためのフィネレノンの前臨床および臨床応用を支持する。
関連する概念動画
Measurement of Bioavailability: Pharmacokinetic Methods
355
Pharmacokinetics is a vital branch of pharmacology that examines how drugs are absorbed, distributed, metabolized, and excreted by the body. Two key methodologies in pharmacokinetics are plasma drug concentration studies and urinary drug excretion analyses, both of which provide critical insights into a drug's therapeutic efficacy and bioavailability.Plasma Drug Concentration-Time StudiesPlasma drug concentration-time studies involve analyzing blood samples at specific intervals to quantify...
355
Renal Failure: Dose Adjustments
534
In patients with renal impairment, drugs undergo significant changes in their pharmacokinetics, which require dosage adjustments to ensure safe and effective therapy.
Reduced renal clearance and elimination rate are common outcomes of renal impairment. These alterations lead to a prolonged elimination half-life and an altered apparent volume of distribution for drugs. As a result, dosage adjustments are typically necessary to maintain optimal drug levels in the body.
However, dosage adjustments...
Reduced renal clearance and elimination rate are common outcomes of renal impairment. These alterations lead to a prolonged elimination half-life and an altered apparent volume of distribution for drugs. As a result, dosage adjustments are typically necessary to maintain optimal drug levels in the body.
However, dosage adjustments...
534
Factors Affecting Renal Clearance: Drug's Physicochemical Properties and Plasma Levels
649
Renal clearance of a drug is influenced by various factors, including its physicochemical properties and plasma levels. These factors play a significant role in determining how efficiently the kidneys eliminate a drug.
One important factor is the drug's molecular size. The kidneys readily excrete smaller molecules below 300 Daltons (Da). On the other hand, molecules weighing between 300 and 500 Da are excreted through both urine and bile. Larger molecules above 500 Da tend to be excreted...
One important factor is the drug's molecular size. The kidneys readily excrete smaller molecules below 300 Daltons (Da). On the other hand, molecules weighing between 300 and 500 Da are excreted through both urine and bile. Larger molecules above 500 Da tend to be excreted...
649
Renal Drug Excretion: Tubular Secretion
995
Active tubular secretion is a robust, energy-demanding process that utilizes carrier systems to transport drugs into renal tubules. The active renal secretion systems include the organic anion transporter (OAT) for weak acids and the organic cation transporter (OCT) for weak bases. Structurally similar drugs can compete for the same transporter, potentially leading to drug accumulation and toxicity. However, this principle can be exploited therapeutically. One example is probenecid (Probalan),...
995
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion
288
In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
288
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution
299
Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are...
299


